Module 02 Physics Aircraft License. Com

8/19/2019 Module 02 Physics Aircraft License. Com

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Module 02. Physics

1. Matter.

1. An atom with 3 free electrons in its outer shell is said to be.A. pentavalent.B. covalent.C. trivalent.Correct Answer is. trivalent.Explanation. Number of electrons in the outer shell is called the valency - 1 monovalent! " divalent! 3 trivalent etc.

". #hat is the mass number of an element$.

A. Number of electrons and protons.B. Number of neutrons and protons.C. Number of electrons and neutrons.Correct Answer is. Number of neutrons and protons.Explanation. N%&.

3. #hat do you 'et when you add "(" and )$.A. (" ).B. "(").

C. "(")" .Correct Answer is. "(" ).Explanation. #ater is molecules each made up of " hydro'en atoms and 1 oxy'en atom. (erether is * hydro'en atoms! and " oxy'en atoms! so we can ma+e " water molecules.

*. ,he splittin' of a chemical compound is called.A. bombardment.B. synthesis.

C. analysis.Correct Answer is. analysis.Explanation. N%&.

. #hat is the atomic number of an element$.A. ,he number of neutrons in the atom.


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B. ,he number of electrons in the atom.C. ,he number of protons in the atom.Correct Answer is. ,he number of protons in the atom.Explanation. N%&. http//en.wi+ipedia.or'/wi+i/Atomic0number

. An atom with free electrons is said to be.A. pentavalet.B. covalent.C. trivalent.Correct Answer is. trivalent.Explanation. ,he valency is the number of electrons in the outer shell if that number is * orless. %f there are more than * electrons! the valency is 2 minus the number of electrons. %n thiscase 2 - 3 trivalent.

. An atom consists of.A. protons! neutron and electrons.B. protons and electrons.C. protons and neutrons.Correct Answer is. protons! neutron and electrons.Explanation. N%&.

2. ,he maximum number of electrons in the inner shell of an atom is.A. 2.B. ".C. *.Correct Answer is. ".Explanation. N%&.

4. ,he mass of a proton e5uals the mass of a.A. neutron.B. beta particle.C. electron.Correct Answer is. neutron.Explanation. 6ass of a proton mass of a neutron 7well! very nearly8.

19. Catalysts.


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A. speed up reactions.B. speed up and slow down reactions.C. slow down reactions.Correct Answer is. speed up reactions.Explanation. A catalyst speeds up reactions! an inhibitor slows down reaction.

11. %f the outer shell of an atom is full the the element is.A. unstable / reactive.B. a 'ood conductor.C. practically inert.Correct Answer is. practically inert.Explanation. N%&.

1". 6olecules of the same compound are held to'ether by.A. cohesive forces.B. adhesive forces.C. 'ravitational forces.Correct Answer is. cohesive forces.Explanation. Cohesion is the property that causes li+e substances to clin' to'ether 7e' watermolecules! formin' raindrops8. Adhesion is the property that causes unli+e substances to stic+to'ether 7e' the raindrops stic+ on a washin' line8.

13. )xy'en has a valency of.A. ".B. .C. 2.Correct Answer is. ".Explanation. )xy'en has electrons in its outer shell. ,he valency is the number of electronsin the outer shell if that number is * or less. %f there are more than * electrons! the valency is 2minus the number of electrons. %n this case 2 - ".

1*. ,he further from the nucleus the shells are in an atom.A. the shells retain the same spacin' from each other.B. the closer the shells 'et to each other.C. the further the shells 'et from each other.Correct Answer is. the further the shells 'et from each other.Explanation. ,he 'ap between the :ener'y levels: reduces! but the physical 'ap increases


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sli'htly. http//www.1stardrive.com/solar/chem.htm

1. #hat determines an element:s identity$.A. ,he number of neutrons.

B. ,he number of electrons.C. ,he number of protons.Correct Answer is. ,he number of protons.Explanation. N%&. http//en.wi+ipedia.or'/wi+i/Atomic0number

1. An isotope of an element will have more/less 000000000 than usual.A. electrons.B. neutrons.

C. protons.Correct Answer is. neutrons.Explanation. N%&. http//en.wi+ipedia.or'/wi+i/%sotope

1. ,he smallest part of an element is.A. a compound.B. an atom.C. a molecule.Correct Answer is. an atom.

Explanation. N%&.

12. ,he nucleus of an atom contains.A. protons and electrons.B. protons and neutrons.C. electrons and neutrons.Correct Answer is. protons and neutrons.Explanation. N%&.

14. #hat is atomic mass$.A. Number of neutrons.B. Number of protons plus the number of neutrons.C. Number of protons.Correct Answer is. Number of protons plus the number of neutrons.Explanation. N%&.


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"9. A solid melted into a li5uid will ta+e up.A. less space.B. the same amount of space.

C. more space.Correct Answer is. less space.Explanation. #hen a solid melts! its volume decreases - and then be'ins to increase a'ain asthe temperature of the li5uid rises.

"1. #hat form of heat is used to turn a solid into a li5uid$.A. specific heat.B. coefficient of heat.

C. heat of fusion.Correct Answer is. heat of fusion.Explanation. ;usion: is another term for meltin' 7as in fusion weldin'8.

"". Chan'e from solid to 'as state without 'oin' throu'h li5uid state is called.A. transformation.B. sublimation.C. state leap.Correct Answer is. sublimation.

Explanation.


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". ,he isotope of a carbon atom C1* to C1" will have.A. same numbers of neutrons.B. same numbers of protons.

C. same number of electrons.Correct Answer is. same numbers of protons.Explanation. An isotope is an atom with the same atomic number but different mass number.Atomic number is the number of protons. 6ass number is the number of protons plus neutrons. Note the number of electrons can differ from one atom to another 7ma+in' ions8.

". %f an atom has " protons! how many electrons will it have$.A. 1.

B. 2.C. ".Correct Answer is. ".Explanation.


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C. mass number.Correct Answer is. electrons.Explanation. No. of protons No. of electrons! or it is not an atom.

39. ,he char'e of an electron is.A. neutral.B. ne'ative.C. positive.Correct Answer is. ne'ative.Explanation. Electrons are ne'ative.

31. A valance electron is an electron.

A. in the innermost shell.B. in the outermost shell.C. which is not within an atom.Correct Answer is. in the outermost shell.Explanation. ,he outer shell is the valence shell.

3". 6olecules of unli+e atoms are combined by their.A. adhesive force.B. ma'netic force.C. cohesive force.

Correct Answer is. adhesive force.Explanation. Cohesion is the property that causes li+e substances to clin' to'ether 7e' watermolecules! formin' raindrops - from :cohesion: meanin' to stic+ to'ether8. Adhesion is the property that causes unli+e substances to stic+ to'ether 7e' the raindrops stic+! or :adhere to: awashin' line8.

33. #hat is the difference between hydro'en! deuterium and tritium$.A. ,he number of electrons.B. ,he number of protons.C. ,he number of neutrons.Correct Answer is. ,he number of neutrons.Explanation. ,here are three isotopes of the element hydro'en hydro'en! deuterium! andtritium. ,hey each have one sin'le proton 7=18! but differ in the number of their neutrons.(ydro'en has no neutron! deuterium has one! and tritium has two neutrons.


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3*. ,he smallest material in the universe is.A. an ion.B. helium.C. hydro'en.Correct Answer is. hydro'en.

Explanation. (ydro'en is the smallest +nown element! havin' >ust 1 electron and 1 proton andno neutrons.

3. #hat is the atomic number of the element shown here$.A. .B. 3.C. *.Correct Answer is. 3.Explanation. ,he atomic number is the number of protons and is always the smallest number

7and yes! the element shown is not possible8.

3. #hat is the mass number of the element shown here$.A. *.B. .C. 4.Correct Answer is. .Explanation. ,he mass number is the number of protons ? the number of neutrons and is

always the bi''est of the " numbers.

3. ,here are solids! li5uids and 'ases present in the universe and every unit of theirs occupysome space. ,his is called.A. matter.B. compound.C. mass.Correct Answer is. matter.Explanation. All material in space is +nown as matter. 7All matter :has: mass! but that is notwhat the 5uestion as+s - what is it +nown as! not! what does it have8.

32. An atom deficient of a valency electron is deficient.A. of an electron in the outer shell.B. of a neutron in the outer shell.


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C. of an electron in the inner shell.Correct Answer is. of an electron in the outer shell.Explanation. ,he valency electrons are in the outer shell.

34. ,he maximum number of electrons in the second shell is.A. *.B. 2.C. ".Correct Answer is. 2.Explanation. ,ry the formula :"n-s5uared:! where :n: is the shell number. %n this case " @ 7" @ "8 2.

*9. #hat does an oxy'en atom consist of$.A. rotons! neutrons and electrons.B. rotons and electrons.C. rotons and neutrons.Correct Answer is. rotons! neutrons and electrons.Explanation. All atoms have protons! neutrons and electrons 7except hydro'en! which has noneutrons8.

*1.


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*3. A catalyst in a chemical reaction does what$.A. Can either speed it up or slow it down.B.


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*2. An element with a full valence shell is.A. very reactive.B. 'ood conductor.

C. inert.Correct Answer is. inert.Explanation. An element with a full valence shell is inert.

*4. A substance of two or more different atoms is.A. a neutrino.B. an isotope.C. a chemical compound.

Correct Answer is. a chemical compound.Explanation. A compound is two or more different atoms.

9. An atom with electrons in its outer shell is.A. trivalent.B. pentavelent.C. covalent.Correct Answer is. trivalent.Explanation. alency is the number of electrons in the outer shell 7up to *8 or 2 minus the

number of electrons in the outer shell 7over *8.

1. rotons have.A. no char'e.B. positive char'e.C. ne'ative char'e.Correct Answer is. positive char'e.Explanation. rotons are positively char'ed.

". roducin' a compound from commonly available materials is.A. synthesis.B. analysis.C. bombardment.Correct Answer is. synthesis.Explanation. 6a+in' a compound is called synthesis! brea+in' it apart is called analysis.


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3. A different number of nucleons in the nucleus of atoms would represent.A. semiconductor.B. isotopes.

C. isotones.Correct Answer is. isotopes.Explanation. An %sotope is an element with a :wron': number of neutrons.

*. 6olecules of matter are in constant motion. ,he amount of vibration or motion isdependent on.A. temperature.B. volume.

C. pressure.Correct Answer is. temperature.Explanation. ,emperature produces molecular motion.

. #hen a chemical chan'e ta+es place! the smallest particle indivisible in an element iscalled.A. an atom.B. an electron.C. a neutron.

Correct Answer is. an atom.Explanation. An atom is the smallest particle in an element. articles smaller than that7neutrons! protons! electrons8 do not define an element.

. A nucleus of an atom consists of.A. positively char'ed particles.B. a nucleus and normally has no overall char'e at all and so is neutral.C. ne'atively char'ed particles.Correct Answer is. positively char'ed particles.Explanation. rotons are positive! neutrons are neutral.

. A compound is a.A. mixture of more than one element which are chemically bonded to'ether.B. solution 7either li5uid or solid8 of elements or mixtures of elements to form a newmaterial.


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C. mixture of more than one element which are mixed to'ether.Correct Answer is. mixture of more than one element which are chemically bonded to'ether.Explanation. A compound is two or more elements chemically bonded.

2. A compound such as water can exist in how many states$.A. ".B. 3.C. 1.Correct Answer is. 3.Explanation.


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Correct Answer is. protons and neutrons.Explanation. 6ass number is the total number of items in the nucleus 7protons and neutrons8.

3. (ow many electrons does an


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Correct Answer is. Carbon.Explanation. N%&. http//education.yahoo.com/reference/dictionary/entry/atomicD"9wei'ht

2. ,he chemical bondin' of two or more elements is called.A. chemical analysis.B. chemical synthesis.C. chemical fusion.Correct Answer is. chemical synthesis.Explanation. N%&. http//en.wi+ipedia.or'/wi+i/Chemical0synthesis

4. ,wo or more elements that are chemically bonded to'ether and have an even mass

distribution form a.A. mixture.B. substance.C. chemical compound.Correct Answer is. chemical compound.Explanation. #hen elements bond chemically! they ma+e a compound.

9. An atom that 'ains one or more additional electrons is called.A. a ne'ative ion.

B. a positive ion.C. an isotope.Correct Answer is. a ne'ative ion.Explanation. Electrons are ne'atively char'ed! so additional electrons ma+e an atom into ane'ative ion.

1. %onic bondin' involves.A. electron sharin'.B. attraction to a free electron cloud.C. electron transfer.Correct Answer is. electron transfer.Explanation. %onic bondin' is formed when electrons are transferred.

". Non-metals form.A. covalent bonds.


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B. a mixture.C. a compound.Correct Answer is. a compound.Explanation. N%&.

2. ,he 6ass of a roton is approximately.A. e5ual to the mass of an electron.B. e5ual to the relative mass of a molecule.C. "999 times 'reater than the mass of an electron.Correct Answer is. "999 times 'reater than the mass of an electron.Explanation. N%&.

4. Noble 'ases are 0000000 and 0000000 and have a full outer shell of electrons.A. fluorine and neon.B. sulphur and neon.C. helium! neon! ar'on.Correct Answer is. helium! neon! ar'on.Explanation. N%&. http//www.chemicalelements.com/'roups/noble'ases.html

29. %f a hydro'en atom has " neutrons and 1 proton what +ind of water would you 'et$.A. ;resh water.

B. (eavy water.C.


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1. An insulator has its electrons.A. ti'htly bound.B. loosely bound.C. otally free from the atoms.Correct Answer is. ti'htly bound.

Explanation. Aircraft Electricity F Electronics th edition ,G Eismin.

". ,he centre of 'ravity of an aircraft is ad>usted by two wei'hts! 19 +' and c+' plaed *m and" m aft of the c of '. ,o what position must a "9 +' wei'ht be added to balance the c of '$.A. ".m.B. *m.C. "m.Correct Answer is. ".m.

Explanation. 719 @ *8 ? 7 @ "8 "9 x $ *9?19"9 x $ $ ".m.

3. ;or the C< system! the force is.A. the :N: which produces an acceration of 1 cm/s" for a mass of 'ram.B. the :dyne: which produces an acceleration of 1cm/s" for a mass of 'ram.C. the :pd1: which produces an acceleration of 1 cm/s" for a mass of 'ram.Correct Answer is. the :dyne: which produces an acceleration of 1cm/ s" for a mass of 'ram.Explanation. N%&.

*. ,he 5uadrature component of a vector is.A. *H to the ori'inal.B. 49H to the ori'inal.C. 129H to the ori'inal.Correct Answer is. 49H to the ori'inal.Explanation. N%&.

. 1 Newton is e5ual to.A. 1 +ilo'ram meter per second per second.B. 1 +ilo'ram of force.C. 1 >oule per second.Correct Answer is. 1 +ilo'ram meter per second per second.Explanation. Iemember Newtons "nd law :;ma:. #ell! :m: is in +ilo'rams! :a: is in metres persecond s5uared 7or meters per second per second8 so put the two to'ether and :;: isJ.


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. ,he


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11. ,he formula for calculatin' stress is.A. load divided by cross sectional area.B. area divided by load.C. load multiplied by cross sectional area.Correct Answer is. load divided by cross sectional area.

Explanation. N%&.

1".


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1. #hen a steel bar is overstressed! what is the name of the point at which it does not return toits ori'inal form after the load is released$.A. Kltimate point.B. Lield point.C. Loun':s modulus.

Correct Answer is. Lield point.Explanation. N%&.

1. ,wo couples with ma'nitude ; act a'ainst each other. ,he resultant will be.A. -";.B. ";.C. 9.Correct Answer is. 9.

Explanation. A :couple: is " forces actin' in the same rotational direction an e5ual distancefrom a pivot point 7li+e turnin' a die holder8. ,wo couples in opposition will cancel each other.

12. ,he hei'ht of mercury re5uired to 'ive 1 bar is.A. 99 mm.B. 1999 mm.C. 9 mm.Correct Answer is. 9 mm.

Explanation. 1 bar is almost atmospheric pressure.

4. A vessel has " ml of water which produces 19 +a. %f another 1" ml of water is added!what will be the pressure in the vessel$.A. *9 +a.B. 9 +a.C. 9 +a.Correct Answer is. 9 +a.Explanation. pressure density @ 'ravity @ hei'ht. "ml ? 1"ml 19ml or times. ac+ becomes full.B. the same rate.


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C. different rates.Correct Answer is. different rates.Explanation. diameter will have the 'reater force. ,he :trade-off: for this is that it will moveslower.

"1. #hat load can be lifted on >ac+ B$.A. 399N.B. "99N.C. 199N.Correct Answer is. 199N.Explanation. 19 times the area! then it can lift 19 times the load.

"". ,he most common method of expressin' pressure is in.A. inch pounds per s5uare inch.B. 'rams per s5uare inch.C. pounds per s5uare inch.Correct Answer is. pounds per s5uare inch.Explanation. ressure is usually measured in ounds per


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A. a condition of hydraulic loc+ exists and no movement will ta+e place.B. the ram will move opposite to the side where the ram is due to pressure actin' ondifferential areas.C. the ram will move to the side where the ram is! due to pressure actin' on differential areas.

Correct Answer is. the ram will move opposite to the side where the ram is due to pressureactin' on differential areas.Explanation. ,he non-ram side has a 'reater area! so the ram will be pushed from that side tothe ram side.

". Ksin' the same hydraulic pressure! the force applied by a hydraulic >ac+ of * s5. inch piston area.A. will be half that applied by a similar >ac+ of " s5. inch piston area.B. will be e5ual to that applied by a similar >ac+ of " s5. inch piston area.

C. will be twice that applied by a similar >ac+ of " s5. inch piston area.Correct Answer is. will be e5ual to that applied by a similar >ac+ of " s5. inch piston area.Explanation. ;orce pressure @ area.

". A pressure of 199 ac+s in a hydraulic system! havin' piston areas " s5 inand * s5 in.A. the smaller >ac+ will exert a force of 9 lb and the lar'er a force of " lb.B. the smaller >ac+ will exert a force of "99 lb and the lar'er a force of *99 lb.C. the two >ac+s will exert the same force.

Correct Answer is. the smaller >ac+ will exert a force of "99 lb and the lar'er a force of *99lb.Explanation. ;orce pressure @ area. 199 @ " "99 lbs. 199 @ * *99 lbs.

"2. ,he purpose of an accumulator in a hydraulic system is to.A. collect air from the hydraulic fluid! thus reducin' the re5uirement for fre5uent bleedin'.B. relieve excess pressure.C. store hydraulic fluid under pressure.Correct Answer is. store hydraulic fluid under pressure.Explanation. An accumulator stores hydraulic pressure for use when the main pressure pumpfails.

"4. %f the hydraulic system accumulator has a low air pressure! it will cause.A. rapid pressure fluctuations durin' operation of services.B. rapid movement of the operatin' >ac+s.


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C. slow build up of pressure in the system.Correct Answer is. rapid pressure fluctuations durin' operation of services.Explanation. ,he secondary purpose of an accumulator is to damp out pressure fluctuations.

39. ,he specific tor5ue loadin' for a bolt is 9 lbs.ins but an extension of " inches is needed toreach the bolt in addition to the 2 inches tor5ue wrench. #hat will the actual readin'$.A. * lb.ins.B. *9 lb.ins.C. 9 lb.ins.Correct Answer is. *9 lb.ins.Explanation. New tor5ue readin' desired tor5ue x &/7x?&8. 9 @ 2/19 *9 lb.ins.

31. %f 199 psi hydraulic pressure is pumped into an accumulator! with a pre-char'e air pressure of 1999 psi the 'au'e will read.A. "99 psi.B. 199 psi.C. 1999 psi.Correct Answer is. 199 psi.Explanation. ,he accumulator pressure 'au'e reads the hydraulic pressure only when it isabove the char'e pressure.

3". Loun':s modulus is.A. stress @ strain.B. strain / stress.C. stress / strain.Correct Answer is. stress / strain.Explanation. Loun':s 6odulus 7E8 is the ratio


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3*. A mass of 19+' placed " metres away from a pivot will have a moment of.A. 14 N6.B. 9 N6.C. "9 N6.Correct Answer is. 14 N6.

Explanation. 19 +' 19 @ 4.2 42N. 6oment force @ radius 42 @ " 14 Nm.

3. " litres of fuel exerts a pressure of 19Ga. %f a further 1" litres is added! the pressure willnow be.A. 9 +a.B. 9 +a.C. *9 +a.Correct Answer is. 9 +a.

Explanation. ,otal ;uel 19 litres @ ". @ ori'inal pressure 9 +a.

3. 1999 lb/in" is in an accumulator. %f 3999 lb/in" of hydraulic fluid is pumped in! what is the pressure on the air side$.A. 3999 lb/in".B. *999 lb/in".C. 1999 lb/in".Correct Answer is. 3999 lb/in".Explanation. ,he piston does not move until the hydraulic pressure exceeds 1999 psi. ;rom

then on! the air and hydraulic pressures are e5ual 7at all times that the piston is off its stops8.

3. A fractional decrease in volume of a material when it is compressed is a function of the.A. compressive strain.B. compressive strain.C. bul+ modulus.Correct Answer is. bul+ modulus.Explanation. Bul+ modulus ratio of chan'e in pressure to the fractional volumecompression.

32. A ram has a piston with " in". Another ram with a piston of * in" will provide.A. the same force.B. double the force.C. s5uare the force.Correct Answer is. double the force.


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Explanation. Mouble the area double the force. 7(owever! if the 5uestion said double theradius or diameter! the force is a s5uare of that! i.e *x8.

34. (ow much force is exerted by piston if it is sub>ected to a pressure of 3999 a and has

surface area of ". m"$.A. 99 N.B. 3999 N.C. 1"99 N.Correct Answer is. 99 N.Explanation. ;orce pressure @ area 3999 @ ". . N.

*9. A force of 19 million Newtons is expressed numerically as.

A. 19 6N.B. 19 6N.C. 1 6N.Correct Answer is. 19 6N.Explanation. million Newtons 19 6N 76e'aNewtons8.

*1. A millilitre is e5ual to.A. one million litres.B. one millionth of a litre.

C. one thousandth of a litre.Correct Answer is. one thousandth of a litre.Explanation. A millilitre 1/1999 litre.

*". %f a s5uare has an area of 4m"! one side is.A. 3 m.B. 3 m".C. 3 s5. m.Correct Answer is. 3 m.Explanation. 3 m @ 3m 4 m".

*3. A vector 5uantity is a 5uantity which.A. possesses sense! ma'nitude and direction.B. possesses direction only.C. possesses sense only.


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Correct Answer is. possesses sense! ma'nitude and direction.Explanation. A vector 5uantity has ma'nitude ANM direction. 7sense and direction are the samethin'8.

**. )ne atmosphere is e5ual to.A. 1."" +'/m".B. 1*. lbf/in".C. "2.4 inches of ('.Correct Answer is. 1*. lbf/in".Explanation. atmosphere 1*. pounds-force 7lbf8 per s5uare inch.

*.


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A. force O cross-sectional area.B. force @ area.C. force O area parallel to the force.Correct Answer is. force O area parallel to the force.Explanation. ;ormula for shear 7stress8 is


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3. 1 ascal e5uals.A. 19 N/m".B. 1 N/m".C. 19 Nm.Correct Answer is. 1 N/m".

Explanation. 1 a 1 N/m".

*. ,he addition of " different vectors to produce another vector is called.A. component.B. resolution.C. resultant.Correct Answer is. resultant.Explanation. ,he resultant of two vectors. ,he mathematical process is actually called

:composition:.

. ,wo items wei'hin' 11+' and 2+' are placed "m and 1m respectively aft of the C of ofan aircraft. (ow far forward of the C of must a wei'ht of 39+' be placed so as not to chan'ethe C of $.A. "m.B. 1.m.C. 1m.Correct Answer is. 1m.

Explanation. ,otal moment 711@"8 ? 72@18 39+'m. ,he 39 +' mass must be placed suchthat 39+' @ Pm 39 +' m. (ence P 1m.

. A point at which the total force of a body acts is +nown as the.A. centre of 'ravity.B. point of e5uilibrium.C. centre of mass.Correct Answer is. centre of 'ravity.Explanation. %f by force they mean :wei'ht: then it is Centre of ravity.

. A load of 99N is suspended by a cable. %f the stress in the cable is said to be limited to1N/mm" the minimum cross sectional area of the cable must be.A. 9.9"mm".B. 4999mm".C. *9mm".


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Correct Answer is. *9mm".Explanation.


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B. mechanical advanta'e of output.C. input wor+ is less than the output wor+.Correct Answer is. mechanical advanta'e of output.Explanation. 6echanical advanta'e is usually on the outp.

3. #hich of the followin' can transmit pressure$.A. &i5uids and 'ases.B.


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A. strain becomes proportional to stress.B. the material ruptures or brea+s.C. permanent deformation ta+es place.Correct Answer is. permanent deformation ta+es place.Explanation. N%&.

2. Assumin' constant temperature. %f a steel bar of len'th " m deforms to a len'th of "." munder applied load. ,he strain is.A. 1.1.B. 9.4.C. 9.1.Correct Answer is. 9.1.Explanation.


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moment of.A. 199 Newton metre.B. 1 Newton metre.C. 1. Gilonewton millimetre.Correct Answer is. 1 Newton metre.

Explanation. 3m @ N 1 Nm.

Ruestion Number. 3. E5uilibrium of translation occurs when.A. downward forces e5ual upward 7reactive8 forces.B. cloc+wise moments e5ual countercloc+wise moments.C. cloc+wise forces and countercloc+wise forces are e5ual.Correct Answer is. downward forces e5ual upward 7reactive8 forces.Explanation. ,ranslation is linear movement.

*. ,he conversion factor to convert litres to pints is.A. 9..B. 1..C. ".".Correct Answer is. 1..Explanation. N%&. http//www.thetipsban+.com/convert.htm

. (ydraulic pressure can be restored by.A. the use of pressure/heat exchan'e.B. compressin' the air char'e in an accumulator.C. compressin' the fluid in a reservoir.Correct Answer is. compressin' the air char'e in an accumulator.Explanation. N%&.

. #hen chec+in' a hydraulic accumulator initial air pressure! the hydraulic system pressure.A. should be at the normal wor+in' pressure.B. is not important.C. should be released.Correct Answer is. should be released.Explanation. N%&.


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. )ne +' is the mass of.A. one litre of pure water.B. one pint of pure water.C. one 'allon of pure water.Correct Answer is. one litre of pure water.

Explanation. N%&. http//www.bartleby.com/2/2/32.html

2. ,he centre of 'ravity of a trian'le is.A. 1/3 the median from the base.B. 1/3 the bisector from the base.C. 1/3 the hei'ht from the base.Correct Answer is. 1/3 the median from the base.Explanation. http//en.wi+ipedia.or'/wi+i/,rian'le

4. A liftin' machine moves with an effort! a distance of "99 cm! in order to raise it 9. m. ,heelocity Iatio is.A. 9.".B. *.C. *9.Correct Answer is. *.Explanation. Mistance ratio input/ output "/9. *. elocity ratio is same as Mistanceration.

29. ,wo ectors are at 49 de'rees to each other havin' ma'nitudes of 3N and *N. ,he resultantis.A. N.B. 1N.C. N.Correct Answer is. N.Explanation. ectors ma+e a 3-*- trian'le.

21. #hich of the followin' has no units$.A.


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2.2. Mechanics – Kinetics.

1. ;or a car wei'hin' 1999 N! what force would be re5uired to accelerate the car to 3 ms-".

A. 3"9 N.B. 39.2 N.C. 3999 N.Correct Answer is. 39.2 N.Explanation. ; ma ; 1999/4.21 @ 3 ; 39.2 N 7,he :divide by: 4.21 is necessary toconvert the 1999 N into a mass 7in +'88.

". A time period of 19 microseconds is e5ual to a fre5uency of.A. 199 +(Q.B. 19 +(Q.C. 1 6hQ.Correct Answer is. 199 +(Q.Explanation. ;re5uency 1/time period. 1/9.99991 199!999 199 +(Q.

3. ,he


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C. metre 7m8.Correct Answer is. metre per second 7m/s8.Explanation. N%&.

. An aircraft flies 139 nmiles in "h 1mins. #hat is the avera'e speed$.A. 99 nmiles/hour.B. 99 miles/hour.C. 19 nmiles/hour.Correct Answer is. 99 nmiles/hour.Explanation. Avera'e speed distance/time 139/"." 99 nm/h.

. A sprin' extends cm to the 'round and bac+ a'ain "9 times a minute. #hat is the

period$.A. cm.B. 3 seconds.C. 1/3 cycle.Correct Answer is. 3 seconds.Explanation. ;re5uency "9/9 1/3 (Q. ,ime period 1/f 3 seconds.

2. A cyclist 'oes from rest to 9 m/s in seconds. #hat is the avera'e acceleration$.A. 19 m/s".

B. 1" m/s"

.C. 2 m/s".Correct Answer is. 19 m/s".Explanation. Acceleration chan'e in speed / time.

4. #hat is the period of a fre5uency of * (Q$.A. 2 seconds.B. 9." seconds.C. * seconds.Correct Answer is. 9." seconds.Explanation. eriod 1/f.

19. A dot rotates around the circumference of a circle. %f the vertical position of this dot is plotted on a 'raph with respect to time the result will be.A. a linear motion.


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B. a transverse waveform.C. a sinusoidal waveform.Correct Answer is. a sinusoidal waveform.Explanation. ,his is why an AC 'enerator produces a sine wave fre5uency.

11. A freely fallin' body! fallin' from a hei'ht of "+m! and assumin' ' 19m/s"! will stri+e the'round in a time of.A. *99s.B. 29s.C. "9s.Correct Answer is. "9s.Explanation. ;rom the e5uations of motion s ut ? 1/"at". %f it starts at rest u 7and hence ut8 isQero. Kse s "999 m! plu' in the numbers and transpose for t.

1". #hat is the an'ular velocity of a shaft rotatin' at 399rpm in radians/second$.A. 19S radians/second.B. "S radians/second.C. S radians/second.Correct Answer is. 19S radians/second.Explanation. velocity "S7I68/9 "S @ 399/9 19S radians/second.

13. ,he force that acts on a body to cause it to rotate in a circular path is called the.A. centripetal force.B. centrifu'al force.C. inertia force.Correct Answer is. centripetal force.Explanation. Centripetal: force is the force pullin' the rotatin' ob>ect towards the centre ofrotation. :Centrifu'al: force is the e5ual and opposite reaction.

1*. An aircraft of " metric tonnes uses 299 +ilo>oules +inetic ener'y to ma+e an emer'encystop. %ts bra+es apply a force of 19 +iloNewtons. #hat distance does it travel before it comes to astop$.A. *9m.B. 299m.C. 29m.Correct Answer is. 29m.Explanation. Ener'y ;orce @ Mistance. 299!999T 19!999N x Mistance. Mistance $$.


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1. A body rotatin' at an an'ular velocity of radians/sec! with a radius of metres has aspeed of.A. S metres per second.B. metres per second.

C. " metres per second.Correct Answer is. " metres per second.Explanation. velocity Iadius @ )me'a 7)me'a radians/sec8. @ " m/s.

1. A mass of *99 +' moves "metres! with a force of *N! what is the wor+ produced$.A. 1*2 T.B. 23." GT.C. 19.1 GT.Correct Answer is. 1*2 T.

Explanation. #or+ ;orce x Mistance * @ " 1*2 T. %t is not movin' under 'ravity so the*99 +' is a red herrin'.

1. A mass on a sprin' nearly hits the 'round "9 times a minute! its fre5uency is.A. 3 cycles per second.B. 1/3 cycle per second.C. "9 cycles per second.Correct Answer is. 1/3 cycle per second.Explanation. cycles per minute "9/9 cycles per second "/ 1/3 cycle per second.

. 12. A body travellin' at "9 m/s accelerates to 3 m/s in 2 seconds! what is itsacceleration$.A. 2 m/s".B. * m/s".C. " m/s".Correct Answer is. " m/s".Explanation. u ?at 3 "9 ? 2a 3-"9 2a 1/2 a.

14. A body dropped from 19 m will hit the 'round in.A. " seconds.B. 9." seconds.C. 1.*1 second.Correct Answer is. 1.*1 second.Explanation. s ut ? 1/"at". ,a+e s 19! u 9! a ' 19. Calculate t. 7Iemember that 9 @ t


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98.

"9. #hat is the rate of 'ravity$.A. 1". m/s".

B. 9.421 m/s".)ption C. 4.21 m/s".Correct Answer is. 4.21 m/s".Explanation. ravity 4.21 m/s".

"1. An ob>ect travels 12 +m in 1 minute 39 seconds. #hat is its avera'e speed$.A. "99 m/s.B. "9 m/s.

C. 199 ms.Correct Answer is. "99 m/s.Explanation. Avera'e speed distance/time 12999 metres / 49 seconds "99 m/s.

"". 199 m is approximately.A. ""9 yards.B. 194 yards.C. yards.Correct Answer is. 194 yards.

Explanation. m 3.3 ft. 199 m 339 ft. 3 ft 1 yd so 339/3 119 yards.

"3. A car moves over a distance of miles at steady speed in 19 minutes. #hat is the speed$.

A. 39 mph.B. 1 mph.C. 9 mph.Correct Answer is. 39 mph.Explanation. in 19 mins! 19 miles in "9 mins! 1 miles in 39 mins! 39 miles in 1 hr.

"*. A spaceship travels a distance of *29!999 miles in " days. #hat is its speed$.A. *2!999 mph.B. 3!999 mph.C. 19!999 mph.Correct Answer is. 19!999 mph.


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Explanation. *29!999/*2 19!999 6(.

". A cyclist covers a distance of 1!999 m at a constant speed in 49 seconds! #hat is hisspeed$.

A. 9 m/s.B. 1". m/s.C. 11.1 m/s.Correct Answer is. 11.1 m/s.Explanation. 1999m/49secs 11.1 m/s.

". (ow lon' will it ta+e a car movin' at 9 +m/hr to travel 49 +m$.A. *9 minutes.

B. minutes.C. 49 minutes.Correct Answer is. 49 minutes.Explanation. +m 1. @ 9! therefore at 9 +m/h it will ta+e 1. hours 49 mins.

". An aircraft travels at 99 +m/hr for 39 minutes at steady speed. (ow far does it move inthat time$.A. 99 +m.B. 1999 +m.

C. "9 +m.Correct Answer is. "9 +m.Explanation. 99 +m/h for 39 m/s a distance of "9 +m.

"2. #hich of the followin' affect the velocity of an ob>ect$.A.


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Correct Answer is. chan'e in speed or direction of movement.Explanation. Acceleration is a vector 7it has ma'nitude as well as direction8.

39. #hat acceleration is produced if a mass increases speed from rest to 19 ft/sec in

seconds$.A. " ft/sec".B. 9 ft/sec".C. 9. ft/sec".Correct Answer is. " ft/sec".Explanation. v u ? at: where u 9! v 19! t ! so a v/t 19/ ".

31. A car travellin' at a speed of m/s accelerates at the rate of 1 m/s". (ow lon' will it ta+e

to reach a speed of "9 m/s$.A. 1 secs.B. 19 secs.C. "9 secs.Correct Answer is. 1 secs.Explanation. ,he car 'ains 1 m/s every second! so to add 1 m/s it will ta+e 1 seconds.

3". Newtons laws of motion apply to.A. solid substances only.

B. all substances irrespective of state.C. 'ases and li5uids only.Correct Answer is. all substances irrespective of state.Explanation. Newtons laws apply to solids! li5uids and 'ases.

33. #hich of Newtons &aws apply most directly to an aircraft which is acceleratin' down arunway$.A. ,he 3rd law.B. ,he "nd law.C. ,he 1st law.Correct Answer is. ,he "nd law.Explanation. ,echnically! all of Newton:s laws apply but the word acceleratin' indicates theyare loo+in' for the second law - ;orce mass x acceleration.

3*. #hich of Newtons &aws apply most directly to a car which is slowin' down due to the


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bra+in' action$.A. ,he 1st law.B. ,he 3rd law.C. ,he "nd law.Correct Answer is. ,he "nd law.

Explanation. ,he car is deceleratin' therefore it is obeyin' the second law - ;orce mass @acceleration 7but technically all three laws apply8.

3. ; ma is an e5uation which expresses.A. Newtons 1st law.B. Newtons "nd law.C. Newtons 3rd law.Correct Answer is. Newtons "nd law.

Explanation. Newton:s second law is ; ma 7;orce mass @ acceleration8.

3. #hat force is re5uired to produce an acceleration of m/s" on a mass of " +'$.A. ". N.B. 19 N.C. 9 N.Correct Answer is. 19 N.Explanation. ; ma " @ 19 Newtons 7;orce is measured in Newtons8.

3. %f a force of 19 lbf produces an acceleration of ". ft/sec"! on what mass is it actin'$.A. * slu's.B. * lb.C. " slu's.Correct Answer is. * slu's.Explanation. ; ma! 19 m @ ".! m 19/". * slu's.

32. #hat is acceleration$.A. Iate of chan'e of velocity.B. Iate of chan'e of movement.C. Iate of chan'e of position.Correct Answer is. Iate of chan'e of velocity.Explanation. Acceleration is rate of chan'e of velocity.

34. %n a 'ear train the driver has 199 ,% and the driven has 9 ,%.


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A. ,he driven rotates twice as fast.B. ,he driver and driven rotate at the same speed.C. ,he driven rotates half as fast.Correct Answer is. ,he driven rotates twice as fast.Explanation. smaller wheel rotates at the faster speed 7of a ratio e5ual to their diameters8.

*9. An aircraft of " metric tonnes lands with *99 +ilo>oules of ener'y! 19 +iloNewtons of forceis applied at the bra+es! how far does the aircraft ta+e to stop$.A. *9 6.B. *99 6.C. 299 6.Correct Answer is. *9 6.Explanation. #or+ done ;orce @ ener'y. #or+ re5uired to convert all the +inetic ener'y

;orce @ distance.


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B. *2m.C. 39m.Correct Answer is. *2m.Explanation. N%&.

**. ,he number of radians in a semi circle are.A. exactly 3.B. S.C. "S.Correct Answer is. S.Explanation. full circle "S radians! so a semicircle S radians 3.1*".

*. ,he an'ular velocity of 99 I6 is! in rads/seconds is e5ual to.A. 1999S rads/s.B. 2.33S rads/s.C. 1.S rads/s.Correct Answer is. 1.S rads/s.Explanation. 99 @ "S/9 1999S/9 199S/ 1..

*. #hich of Newton:s laws relates to the formula ;orce mass @ acceleration$.A. 1st.

B. "nd.C. 3rd.Correct Answer is. "nd.Explanation. Newton:s


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A. 1*!*99 T.B. 1!"99 T.C. "2!299 T.Correct Answer is. "2!299 T.Explanation. 19 Toules @ "revs/min @ 9 mins @ "* hours.

*4. ,he siQe of Centripetal ;orce on an ob>ect travellin' in a circle.A. increase with increasin' mass of the ob>ect.B. decreases with increasin' speed of the ob>ect.C. increases with an increasin' radius of circle.Correct Answer is. increase with increasin' mass of the ob>ect.Explanation. N%&.

9. ;or an ob>ect in circular motion at constant velocity! if the radius of its path is doubled thecentripetal force will.A. double.B. remain the same.C. half.Correct Answer is. half.Explanation. N%&.

1. An aircraft wei'hin' *99 pounds lands at a speed of 19 ft/


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3. )ne radian is e5ual to.A. the an'le subtended at the centre of a circle when the arc-len'th formed between two radiallines is e5ual in len'th to the radius.B. . de'rees.C. the an'le subtended at the centre of a circle when the arc-len'th formed between two radial

lines is e5ual to S.Correct Answer is. the an'le subtended at the centre of a circle when the arc-len'th formed between two radial lines is e5ual in len'th to the radius.Explanation. N%&.

*. A wei'ht on a sprin' almost touches the floor times over "1 seconds. #hat is itsfre5uency$.A. 3 cycles/second.

B. 1/3 cycles/second.C. cycles/second.Correct Answer is. 1/3 cycles/second.Explanation. ;re5uency number of oscillations divided by time /"1 1/3.

. #hich of the followin' statements describes centrifu'al force$.A. E5ual to centripetal force and acts in the opposite direction.B. reater than centripetal force and acts in the opposite direction.C.


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B. 3 seconds.C. 1." seconds.Correct Answer is. 3 seconds.Explanation. , "xSU&/' U"./19 @ U9." @ 9. 3.

2. A drive shaft has a speed 19S radians a second. #hat is the speed in I6$.A. *99.B. 4999.C. 199.Correct Answer is. *99.Explanation. 19S @ 9/"S *99.

2.3a. Mechanics – Dynamics.

1. As an ob>ect slides down a slope! its.A. +inetic ener'y increases and its potential ener'y increases.B. +inetic ener'y increases and its potential ener'y decreases.C. +inetic ener'y decreases and its potential ener'y increases.Correct Answer is. +inetic ener'y increases and its potential ener'y decreases.Explanation. otential ener'y is converted into +inetic ener'y.

". A sin'le fixed pulley 7discountin' friction etc8 has a mechanical advanta'e of.A. ".B. 1/".C. 1.Correct Answer is. 1.Explanation. N%&.

3. #hat is the ratio of load to effort called$.A. 6echanical advanta'e.B. elocity ratio.C. 6echanical ratio.Correct Answer is. 6echanical advanta'e.Explanation. N%&.

*. 1 +# is.


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A. 3*13 B,K per hour.B. 1. (.C. 39 Toules.Correct Answer is. 3*13 B,K per hour.Explanation. 1 B,K 9."43 #. 1 # 1/9."43 B,K 3.*13 B,K. 1 +# 3*13 B,K.

. ,he tension in the cable of a crane is "99 N and it lifts a load throu'h 9m! what is thewor+ done on the load$.A. 1." @ 19 T.B. 99 T.C. 1". +T.Correct Answer is. 1." @ 19 T.Explanation. N%&.

. #hat is the +inetic ener'y of an aircraft of mass of " metric tonnes and has a velocity of"m/s$.A. 2 +T.B. * +T.C. " +T.Correct Answer is. * +T.Explanation. Ginetic ener'y 1/"m. )nly the is s5uared. " metric tonnes "999 +'.

. ,he wor+ done in liftin' a mass of "999 +' vertically to a hei'ht of *9 metres is.A. 29 +T.B. 2*.2 +T.C. 99 +T.Correct Answer is. 2*.2 +T.Explanation. #or+ done ;orce @ distance 7force mass @ 'ravity8. #d "999 @ 19 @ *9 299!999 approx. 7answer is sli'htly less because ' 4.21! not 198.

2. %f a machine has a mechanical advanta'e of 19 and a velocity ratio of "9. ,he efficiency ofthe machine is.A. "99D.B. 9..C. ".Correct Answer is. 9..Explanation. 19 times the force out and only 1/"9th speed! it must have an efficiency of a 1/".


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7199D efficient it would have 19 times the force and 1/19th the speed - strai'ht trade of force forspeed8.

4. 1 #att .

A. 1+'/h.B. 1 Toule/s.C. 1 (.Correct Answer is. 1 Toule/s.Explanation. 1 #att 1 Toule/second.

19. (ow would you wor+ out the wor+ done by a machine assumin' it is 199D efficient$.A. %nput and output.

B. 6echanical advanta'e and output.C. 6echanical advanta'e and input.Correct Answer is. 6echanical advanta'e and input.Explanation. Assumin' the :input: means input force! to calculate the wor+ done you will needthe input force and the mechanical advanta'e of the machine to calculate the output force anddistance 7#or+ done force @ distance of output8.

11. %'norin' friction! if you let an ob>ect slide down a slope! at the bottom.A. the potential ener'y is e5ual to the +inetic ener'y.

B. the potential ener'y is more than the +inetic ener'y.C. the +inetic ener'y is more than the potential ener'y.Correct Answer is. the +inetic ener'y is more than the potential ener'y.Explanation. All potential ener'y is converted to +inetic ener'y.

1". 1 ( 33999 ft.lbs/min or 99 ft.lbs/s or.A. 3 #atts.B. * #atts.C. 139 #atts.Correct Answer is. * #atts.Explanation. 1 ( * #atts.

13. A force of 1N is needed to move a body of mass 39+' alon' a footpath with uniformvelocity. ;ind the coefficient of dynamic friction.7ta+e ' as 19m/s/s8.A. 1/"9.


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B. 1/".C. "9.Correct Answer is. 1/"9.Explanation. N%&.

1*. A mass of *99+' moves " metres with a force of *N. #hat is the wor+ produced$.A. 19.1+T.B. 23."+T.C. 1*2T.Correct Answer is. 1*2T.Explanation. N%&.

1. ,he oule in calories$.A. *.12.

B. "".C. 9."34.Correct Answer is. 9."34.Explanation. N%&.

1. %f you push an ob>ect with a force of N for 19 m in * seconds! how much power isused$.A. 1". watts.B. 2 watts.C. "99 #atts.Correct Answer is. 1". watts.Explanation. N%&.

12. #hat is the Ginetic Ener'y of a " +' ob>ect movin' at a velocity of 1" m/s$.A. "* Toules.


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B. "22 Toules.C. 1** Toules.Correct Answer is. 1** Toules.Explanation. N%&.

14. A mass of 3+' wei'hs approximately.A. 9. N.B. . &B.C. 1.3 &B.Correct Answer is. . &B.Explanation. 1 +' "." lb.


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B. ascal 7a8.C. Toule 7T8.Correct Answer is. Toule 7T8.Explanation. N%&.

"4. A *. +# electric motor is 49D efficient. (ow much ener'y does it use in "9 seconds$.

A. 49 +T.B. "." +T.C. 199 +T.Correct Answer is. 199 +T.Explanation. N%&.

39. A pile driver of mass 1999 +'! hits a post 3 m below it. %t moves the post 19 mm. Assumin''ravity 19 m/s! what is the +inetic ener'y of the pile driver$.A. 39 +T.B. * +T.C. 49 +T.Correct Answer is. 39 +T.Explanation. N%&.

31. ,he


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A. Toules @


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*. ,he


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Explanation. A tied 'yro has one axis fixed to a point 7in space or on earth8. An earth 'yro is atied 'yro but with one axis specifically fixed to a reference on earth.

4. ,he point at which an applied force overcomes friction and an ob>ect be'ins to move is the

co-efficient of.A. limitin' friction.B. static friction.C. +inetic friction.Correct Answer is. limitin' friction.Explanation. N%&.

19. ,he amount a 'yro precesses when a tor5ue is applied is.

A. proportional to the tor5ue.B. inversely proportional to the tor5ue.C. proportional to the s5uare of the tor5ue.Correct Answer is. proportional to the tor5ue.Explanation. N%&.

11. ,he 'yroscopic principle is based upon.A. Newtons 3rd &aw.B. Newtons "nd &aw.

C. Newtons 1st &aw.Correct Answer is. Newtons 1st &aw.Explanation. Newton:s ;irst &aw is also called the :%nertia &aw:.

1". A mass of "9+' produces a momentum of 399+'m/s. #hat is the Ginetic ener'y$.A. 3"9 Toules.B. ""9 Toules.C. 9." Gilo>oules.Correct Answer is. ""9 Toules.Explanation. 6omentum 6! 399 "9! 1. GE 1/"6 " 1/"@"9@1@1 ""9T.

13. A motorcycle of mass *99+' is movin' at a velocity of 2m/s. Calculate its momentum.A. 3"99 +'m/s.B. 9 +'m/s.C. 3"9 +'m/s.


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Correct Answer is. 3"99 +'m/s.Explanation. 6omentum mass @ velocity.

1*. %f the speed of a 'yro is increased! the force re5uired to precess the 'yro is.

A. increased.B. remains the same.C. decreased.Correct Answer is. increased.Explanation. Ii'idity increases with I6.

2.4a. Mechanics - Fluid Dynamics.

1. ,he specific 'ravity of a substance is calculated by.A. density of the body s5uared multiplied by the density of water.B. the density of the body divided by the density of water.C. density of the body multiplied by the density of water.Correct Answer is. the density of the body divided by the density of water.Explanation.


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C. ?"9 HC and 9 mm of mercury.Correct Answer is. 9 HC and 9 mm of mercury.Explanation.


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4. ,he standard temperature and pressure for measurin' the volume of li5uids and solids is.A. "9 HC and 99 mm('.B. "9 HC and 9 mm('.

C. 9 HC and 9 mm('.Correct Answer is. "9 HC and 9 mm('.Explanation.


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Correct Answer is. 2.4.Explanation. rel. density density of substance/density of water 2499/1999.

2.4b. Mechanics - Fluid Dynamics.

1. Atmospheric pressure at %


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. #ater is most dense at.A. -* HC.B. 9 HC.C. ?* HC.

Correct Answer is. ?* HC.Explanation. As water cools! the molecules be'in to crystallise at * HC. CrystalliQed water 7i.e.ice8 has a 'reater volume than li5uid water and therefore less density 7that is why ice floats8.http//www.physical'eo'raphy.net/fundamentals/2a.html

. iscosity can be described as.A. Newton:s 1st law of motion.B. fluids flowin' in a strai'ht line.

C. the internal resistance for a fluid to flow.Correct Answer is. the internal resistance for a fluid to flow.Explanation. iscosity is opposition to flow of a fluid.

. (ow much lift is produced on a win' can be derived from.A. Bernoulli:s ,heorem.B. ;araday:s law.C. Charles law.Correct Answer is. Bernoulli:s ,heorem.

Explanation. Bernoulli:s theorem.

2. ressure in a pipe is.A. force per unit area.B. mass divided by cross-sectional area.C. wei'ht per unit area.Correct Answer is. force per unit area.Explanation. N%&.

3a. hermodynamics.

1. Convert " de'rees centi'rade to ;ahrenheit.A. .B. .C. -.


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Correct Answer is. .Explanation. 7"@1.28?3" .

". Lou are at the north pole where the temperature is minus 9 HC below freeQin'. #hat sort of

thermometer would you use to measure it$.A. #ater.B. Alcohol.C. 6ercury.Correct Answer is. Alcohol.Explanation. N%&.

3. Convert 1 HC to H;.

A. 3 H;.B. 4 H;.C. " H;.Correct Answer is. 4 H;.Explanation. %


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Correct Answer is. 19 Toules.Explanation. N%&.

. ,emperature is a measure of.

A. the amount of friction produced by two matin' surfaces.B. the amount of vibration of molecules.C. the heat ener'y of particles.Correct Answer is. the amount of vibration of molecules.Explanation. (eat ener'y applied to an ob>ect does not necessarily increase temperature 7e'.when meltin' or evaporatin'8.

2. #hat temperature scale is used with the combined 'as law$.

A. Absolute.B. ;ahrenheit.C. Celsius.Correct Answer is. Absolute.Explanation. Gelvin 7absolute scale8 is always used with the combined 'as law e5uation.VW.

4. #hat is 1 btu/lb in >oules per +ilo'ram$.A. "3" >/+'.B. *1"2 >/+'.

C. 4.12 >/+'.Correct Answer is. "3" >/+'.Explanation. ,his is referrin' to specific ener'y content 7T/+' or Btu/lb8 of fuel. 1 btu 19 T.1 lb "." +'. ,herefore 1 btu "3" T/+'.

19. 1 C(K Centi'rade (eat Knit 1*99 ft lbs ener'y to raise.A. 1 lb of water by 1 H;.B. 1 +' of water by 1 HC.C. 1 lb of water by 1 HC.Correct Answer is. 1 lb of water by 1 HC.Explanation. 1 C(K is the heat re5uired to raise 1 lb of water 1 de'ree Centi'rade 71.2 B,K8.

11. 1 B,K 2 ft lbs which is the ener'y re5uired to raise the temperature of.A. 1 lb of water by 1 H;.B. 1 +' of water by 1 H;.


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C. 1 lb of water by 1 HC.Correct Answer is. 1 lb of water by 1 H;.Explanation. 1 B,K is the heat re5uired to raise 1 lb of water 1 de'ree ;ahrenheit.

1". A temperature of *1 de'rees ;ahrenheit is! in Centi'rade.A. 4 de'rees.B. de'rees.C. de'rees.Correct Answer is. de'rees.Explanation. C /47;-3"8.

13. (eat is described as.

A. a hi'h temperature.B. ener'y in transit.C. the stored ener'y in a hot body.Correct Answer is. ener'y in transit.Explanation. (eat is a type of transfer of ener'y which increases the +inetic ener'y of themolecules within a body.

1*. 99G is e5ual to.A. 23 HC.

B. 23 HC.C. 3".2 HC.Correct Answer is. 3".2 HC.Explanation.


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C. "3 G.Correct Answer is. 33 G.Explanation. Me'rees C to Gelvin - >ust add "3.

1. -*9 HC in ;ahrenheit is.A. " H;.B. 2 H;.C. -*9 H;.Correct Answer is. -*9 H;.Explanation. H; 1.2 HC ? 3" 1.27-*98 ? 3" -*9 H;. lease do not report this as an error.

12. Absolute Qero is.

A. 9 HC.B. "3.1 G.C. -"3.1 HC.Correct Answer is. -"3.1 HC.Explanation. Absolute Qero is - "3.1 de'rees Celsius.

14. )ne de'ree increment on the Centi'rade scale is e5ual to what increment on the ;ahrenheitscale$.A. 1.2 H;.

B. 33 H;.C. 1" H;.Correct Answer is. 1.2 H;.Explanation. A chan'e of: 1 de'ree C. it is e5ual to :a chan'e of: 1.2 de'ree ;.

"9. ,ransfer of heat from a hot area to a cold area is.A. conduction.B. convection.C. radiation.Correct Answer is. conduction.Explanation. Convection is a transfer of :matter: from one place to another. Iadiation is asystem which heats up anythin' in its path. but heat is not :transferred:.

"1. ;ahrenheit may be converted to Celsius by usin' the e5uation.A. HC /4 @ 7 H; - 3"8.


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B. HC /4 @ H; - 3".C. HC 4/ @ H; ? 3".Correct Answer is. HC /4 @ 7 H; - 3"8.Explanation. HC /47 H;-3"8. H; 4/ H; ? 3".

"". #hat is 1 B,K/lb in >oules per +ilo'ram$.A. *1"2 >oules per +ilo'ram.B. 4.12 >oules per +ilo'ram.C. "3" >oules per +ilo'ram.Correct Answer is. "3" >oules per +ilo'ram.Explanation. 1 B,K/lb "3" >/+'. ,his is referrin' to heat of combustion of fuel.

"3. Celsius to ;ahrenheit is calculated by.A. 74/ @ HC8 ? 3".B. 7/4 @ HC8 ? 3".C. 7/4 ? 3"8 ? HC.Correct Answer is. 74/ @ HC8 ? 3".Explanation. Iemember standard sea level temperature is 1 HC and 4;. 6a+e HC 1 oneach formula above! and see which comes out at 4 H;V.

"*. ,he percenta'e of nitro'en in air is approximately.

A. 9.".B. 9."1.C. 9.2.Correct Answer is. 9.2.Explanation. N%&.

". #hen a system under'oes a complete cycle where the net heat supplied is e5ual to wor+done plus a chan'e in internal ener'y - this is +nown as.A. "nd &aw of thermodynamics.B. ;irst law of thermodynamics.C. %deal as law.Correct Answer is. ;irst law of thermodynamics.Explanation. N%&.

". %n a heat pump.


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A. the evaporator 'ains heat durin' the heatin' cycle.B. the condenser always loses heat.C. the pump operates in both directions.Correct Answer is. the pump operates in both directions.Explanation. N%&.

". #hat is -"2 HC on the Gelvin scale$.A. "* G.B. 12 G.C. "41 G.Correct Answer is. "* G.Explanation. -"2 ? "3 "*.

"2. #hen water freeQes! heat ener'y is.A. absorbed.B. retained.C. released.Correct Answer is. released.Explanation. ;reeQin' is :exothermic:.

"4. 2*" de'rees ;ahrenheit is e5ual to.

A. *9 Me'rees Celsius.B. *99 Me'rees Celsius.C. "3"." de'rees Celsius.Correct Answer is. *9 Me'rees Celsius.Explanation. C /47; - 3"8.

39. ;or a fixed mass of water at sea level %


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B. the temperature below which condensation occurs.C. the temperature above which condensation occurs.Correct Answer is. the temperature below which condensation occurs.Explanation. N%&.

3". By addin' impurities to water.A. the meltin' point will increase and the boilin' point decrease.B. there will be no effect to the meltin' and boilin' points.C. the meltin' point will decrease and the boilin' point will increase.Correct Answer is. the meltin' point will decrease and the boilin' point will increase.Explanation. N%&.

33. #hich type of circuit is used when the temperature of the source has insufficient heat forthermocouple application$.A. thermistor.B. temperature bulb.C. balanced brid'e.Correct Answer is. thermistor.Explanation. N%&.

3*. ;our pounds of 'as at a temperature of 1 HC is heated to 24 HC. ,he specific heat at

constant pressure and constant volume are 9."*9* and 9.112 respectively. ;ind the heatabsorbed by the 'as at constant pressure and at constant volume.A. 9.1 C.(.K. and 9 C.(.K.B. *4. C.(.K. and 4 C.(.K.C. 4." C.(.K. and *4. C.(.K.Correct Answer is. 4." C.(.K. and *4. C.(.K.Explanation. R mC7," -,18! * @ 9."*9* @ " 4." C(K! and * @ 9.112 @ " *4. C(K.

3. %n :standard conditions: what is the standard for measurement of volume and density of a'as$.A. 9 HC and 9mm of 6ercury.B. "9 HC and 99mm of 6ercury.C. "9 HC and 9mm of 6ercury.Correct Answer is. 9 HC and 9mm of 6ercury.Explanation.


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3. %n :standard conditions: what is the standard for measurement of volume and density of ali5uid or solid$.A. "9 HC and 9mm of 6ercury.B. 9 HC and 9mm of 6ercury.

C. "9 HC and 99mm of 6ercury.Correct Answer is. 9 HC and 9mm of 6ercury.Explanation. N%&.

3. 2*" Me'rees ;ahrenheit is e5ual to.A. *9 Me'rees Celsius.B. "3"." Me'rees Celsius.C. *99 Me'rees Celsius.

Correct Answer is. *9 Me'rees Celsius.Explanation. N%&.

32. #hich of the followin' " points are e5ual$.A. -3" HC and 9 H;.B. *9 HC and *9 H;.C. -*9 HC and -*9 H;.Correct Answer is. -*9 HC and -*9 H;.Explanation. N%&.

34. #hat is 199 Me'rees Centi'rade in ;ahrenheit$.A. 39 Me'rees.B. 1*2 Me'rees.C. "1" Me'rees.Correct Answer is. "1" Me'rees.Explanation. N%&.

*9. ,he absolute temperature scale that has the same increments as the ;ahrenheit scale isthe.A. Ian+in scale.B. Gelvin scale.C. Celsius scale.Correct Answer is. Ian+in scale.Explanation. N%&.


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*1. ,he absolute temperature scale that has the same increments as the Celsius scale is the.

A. Ian+in scale.

B. Gelvin scale.C. ;ahrenheit scale.Correct Answer is. Gelvin scale.Explanation. N%&.

3b. hermodynamics.

1. ;or a heat pump to internally heat it uses a.

A. inside evaporator.B. inside condenser.C. outside condenser.Correct Answer is. inside condenser.Explanation. N%&. http//en.wi+ipedia.or'/wi+i/(eat0pump

". ,he heat re5uired to chan'e a li5uid to a 'as is called the heat of.A. condensation.B. fusion.

C. vapourisation.Correct Answer is. vapourisation.Explanation. &i5uid to 'as is vapourisation.


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C. ammonia! freon! methyl bromide.Correct Answer is. water! ammonia! freon.Explanation. All are refri'erants - water is used in coolin' towers. 6ethyl bromide is almostcompletely phased out due to safety and environmental reasons. Carbon dioxide has been used but no more due to availability of better refri'erants such as ammonia.

. (ow is heat transferred in a vacuum$.A. Convection.B. Conduction.C. Iadiation.Correct Answer is. Iadiation.Explanation. N%&.

. ,he specific heat capacity of a 'as heated at constant pressure! when compared to thespecific heat capacity of a 'as heated at constant volume! is.A. more.B. less.C. the same.Correct Answer is. more.Explanation. Cp is sli'htly hi'her than Cv. Ksually it only applies to 'ases. ;or example the Cpfor air is 1.* times more than its Cv.

. Adiabatic compression is when.A. no heat is lost or 'ained.B. +inetic ener'y is 'ained.C. heat is 'iven off to the surroundin's.Correct Answer is. no heat is lost or 'ained.Explanation. N%&.

2. ,he heat re5uired to chan'e a solid to a li5uid is called the heat of.A. vapourisation.B. condensation.C. fusion.Correct Answer is. fusion.Explanation. Another word for meltin' is :fusion: 7as in fusion weldin' - or... :a fuse:8.


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4. &atent heat is the.A. heat re5uired to raise the temperature of a body by 1 HC.B. heat re5uired to raise 1+' of matter by 1G.C. heat re5uired to chan'e the state of a body.Correct Answer is. heat re5uired to chan'e the state of a body.

Explanation. &atent: means :hidden:. %t is the heat ener'y re5uired to chan'e the state 7melt orvapourise8. No rise in temperature is pruduced whilst doin' so - hence the :hidden: bit.

19. ,he intensity of radiated heat is.A. inversely proportional to the s5uare of the distance from the source of the heat.B. not effected by the distance from the source of the heat.C. directly proportional to distance from the source of the heat.Correct Answer is. inversely proportional to the s5uare of the distance from the source of the

heat.Explanation. &i+e most such thin's! intensity of heat! 'ravity! ma'netism etc. - they all reducewith the s5uare of the distance 7i.e. double the distance and the intensity is 1/*8.

11. As a bloc+ of ice is melted 7to * HC8. %ts volume.A. remains the same.B. decreases.C. increases.Correct Answer is. decreases.

Explanation. %ce expands as it 'ets colder - which is why water pipes burst if they freeQe.

1". A 'ood refri'erant has.A. hi'h condensin' pressure! low evaporatin' temperature.B. hi'h condensin' pressure! hi'h evaporatin' temperature.C. low condensin' pressure! low vaporatin' temperature.Correct Answer is. low condensin' pressure! low vaporatin' temperature.Explanation. ,he refri'erant must evaporate at lower temperature than the :cold space: andmust condense at a relatively hi'h temperature! with a low compression level.

13. %n a heat pump.A. %n a heat pump.B. the condenser loses heat.C. flow across the condenser is always in one direction.Correct Answer is. the condenser loses heat.


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Explanation. (eat pumps can be used to cool as well as heat. Iefri'erant flow chan'esdirection respectively! but the condensor always re>ects the heat.

1*. Charles: &aw states that.

A. volume varies inversely with temperature.B. volume varies directly with temperature.C. volume e5uals pressure @ temperature.Correct Answer is. volume varies directly with temperature.Explanation. N%&. http//en.wi+ipedia.or'/wi+i/Charles0law

1. Boyle:s law states that.A. pressure e5uals temperature divided by volume.

B. pressure varies directly with volume.C. pressure varies inversely with volume.Correct Answer is. pressure varies inversely with volume.Explanation. ressure rises! volume decreases.

1. Convection does not occur in.A. li5uids.B. li5uids.C. solids.

Correct Answer is. solids.Explanation. ,he medium must :flow: for conduction to ta+e place.

1. A process where volume does not chan'e is.A. isochoric.B. isobaric.C. isothermic.Correct Answer is. isochoric.Explanation. N%&.

12. A process where heat is not transferred to or from a 'as is.A. adiabatic.B. isochoric.C. isobaric.Correct Answer is. adiabatic.


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Explanation. N%&.

14. A process where pressure does not chan'e is +nown as.A. isochoric.

B. isothermic.C. isobaric.Correct Answer is. isobaric.Explanation. %so: means e5ual. :bar: is pressure.

"9. #hen a li5uid is heated! it expands.A. more than a solid.B. less than a solid.

C. more than a 'as.Correct Answer is. more than a solid.Explanation. enerally spea+in'! li5uids have a 'reater coefficient of thermal expansion thansolids.

"1. %f pressure on a li5uid increases! whilst temperature is held constant! the volume will.A. decrease.B. remain constant.C. increase.

Correct Answer is. remain constant.Explanation. &i5uids are incompressible.

"". A process where temperature remains the same is +nown as.A. isobaric.B. isochoric.C. isothermic.Correct Answer is. isothermic.Explanation. %so: means e5ual. :,hermal: is temperature.

"3. #hat is descriptive of Boyle:s &aw$ 7ressure! olume! ,,emperature8.A. is proportional to 1/,.B. is proportional to 1/.C. is proportional to ,.Correct Answer is. is proportional to 1/.


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Explanation. ressure 78 is inversely proportional to volume 78.

"*. A compressor increases.A. +inetic ener'y.

B. potential ener'y.C. movin' ener'y.Correct Answer is. potential ener'y.Explanation. Compressed air is a form of :potential ener'y:.

". 1 @ 1 / ,1 " @ " / ," is 7ressure! olume! ,,emperature8.A. %deal 'as law.B. Charles: law.

C. Boyle:s law.Correct Answer is. %deal 'as law.Explanation. N%&.

". 1 / ,1 " / ," at a constant pressure is 7ressure! olume! ,,emperature8.A. ideal 'as law.B. Boyle:s law.C. Charles: law.Correct Answer is. Charles: law.

Explanation. N%&.

". 1 @ 1 " @ " at a constant temperature is 7ressure! olume!,,emperature8.A. Boyle:s law.B. ideal 'as law.C. Charles: law.Correct Answer is. Boyle:s law.Explanation. N%&.

"2. ,he atmosphere:s temperature chan'es at a rate of -1.42 HC per 1999 ft up to 3!999 ftwhere it remains constant at.A. - H;.B. -" HC.C. - HC.


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Correct Answer is. - HC.Explanation. ,he troposphere is a constant - de'rees C.

"4. A process where heat is 'iven off to its surroundin's is called.

A. isothermal.B. adiabatic.C. isobaric.Correct Answer is. isothermal.Explanation. Adiabatic: is a process where N) heat is 'iven off to its surroundin's. %sobaric isconstant pressure. %sothermal! to +eep constant temperature must 'ive off heat as it iscompressed.

39. A body which is allowed to expand when heated! expands past the pressure imposed on itand.A. a force is produced.B. nothin' will happen.C. wor+ is done.Correct Answer is. wor+ is done.Explanation. #or+ is done when it exerts a force and moves 7wor+ force x distance8. Les! aforce is produced but this is not the whole story.

31. ,he 5uantity of heat developed by burnin' 1 +' of fuel is +nown as.A. radiant heat.B. latent heat.C. heat of combustion.Correct Answer is. heat of combustion.Explanation. ,he ener'y content of fuel is +nown as :heat of combustion:.

3". ,he transfer of heat throu'h radiation is achieved by the application of radioactiveisotopes.A. the application of radioactive isotopes.B. warmin' up the intervenin' medium.C. not warmin' up the intervenin' medium.Correct Answer is. warmin' up the intervenin' medium.Explanation. N%&.


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33. ,he dew point is.A. the point when air is cooled at which the moisture >ust starts to condense.B. the point at which air can be heated.C. the point when air is cooled at which the moisture does not condense.Correct Answer is. the point when air is cooled at which the moisture >ust starts to condense.

Explanation. Chec+ the definition of dew point.

3*. #hat are common refri'erant a'ents$.A. formaldehyde! ammonia! carbon dioxide.B. water! freon! ammonia.C. Mry ice! methyl bromide! water.Correct Answer is. water! freon! ammonia.Explanation. #ater is used in coolin' towers 7and when you sweat8. ;reon and ammonia are

commonly used in frid'es and air-con systems.

3. Murin' a process of 'as heatin'! no heat is absorbed or 'iven out. %t is.A. adiabatic.B. isochoric.C. isothermal.Correct Answer is. adiabatic.Explanation. No heat absorbed or 'iven out is :adiabatic:.

3. Murin' a pressurisin' process! all heat is 'iven away. %t is.A. adiabatic.B. isochoric.C. isothermal.Correct Answer is. isothermal.Explanation. All heat 'iven away +eeps the process at constant temperature - thus :isothermal:.

3. A material capable of 'oin' direct from solid to 'as is a.A. substrate.B. substance.C. sublimate.Correct Answer is. sublimate.Explanation. A sublimate can 'o directly from solid to 'as.


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32. ,he composition of the atmosphere is approximately.A. 1/ oxy'en and */ nitro'en.B. */ oxy'en and 1/ nitro'en.C. "/ oxy'en and 3/ nitro'en.Correct Answer is. 1/ oxy'en and */ nitro'en.

Explanation. Air is 2D 7approx. */8 nitro'en and "1D 7approx 1/8 oxy'en.

34. #hat is meant by adiabatic$.A. All heat crosses the boundary.B. No heat crosses the boundary.C.


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B. proportional to distance.C. inversely proportional.Correct Answer is. inversely proportional to the s5uare of the distance.Explanation. ,he wordin' of this 5uestion is terrible! but it is probably referrin' to radiant heat bein' inversely proportional to the s5uare of the distance from the source of the.

**. Combined 'as law relates volume! pressure and.A. temperature.B. density.C. velocity.Correct Answer is. temperature.Explanation. 11/,1 ""/," Combined 7or ideal8 'as law.

*. ,he heat 'iven off by burnin' a 1+' bloc+ of wood is.A. transmissive heat.B. radiant heat.C. latent heat.Correct Answer is. radiant heat.Explanation. ,he embers of burnin' wood produce radiant heat.

*. ("9 in what form holds most ener'y$.

A.


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B. sensible ener'y.C. the latent heat of fusion.Correct Answer is. the latent heat of fusion.Explanation. ;usion means :to melt:.

*4. %deal 'as 'oes throu'h an isothermal process. %t is in accordance with which law$.A. ay &ussac:s.B. Boyle:s.C. Charles:s.Correct Answer is. Boyle:s.Explanation. Boyle:s &aw 7/ constant8 assumes constant temperature 7isothermal8.

9. ,he


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A. Both 1 +' of ice at 9 HC and 1 +' of water at 9 HC have the same amount of heat ener'y.B. 1 +' of water at 9 HC.C. 1 +' of ice at 9 HC.Correct Answer is. Both 1 +' of ice at 9 HC and 1 +' of water at 9 HC have the same amount ofheat ener'y.

Explanation. ,he temperature only is a measure of the heat ener'y! not the state.

*. #hich wei'hs the most$.A. 1 +' of ice at 9 HC.B. Both 1 +' of ice at 9 HC and 1 +' of water at 9 HC have the same wei'ht.C. 1 +' of water at 9 HC.Correct Answer is. Both 1 +' of ice at 9 HC and 1 +' of water at 9 HC have the same wei'ht.Explanation. N%&.

. #hich has the 'reatest density$.A. 1 +' of ice at 9 HC.B. 1 +' of water at 9 HC.C. Both 1 +' of ice at 9 HC and 1 +' of ice at 9 HC have the same density.Correct Answer is. Both 1 +' of ice at 9 HC and 1 +' of ice at 9 HC have the same density.Explanation. N%&.

. #hich has the 'reatest volume$.A. 1 +' of water at 9 HC.B. 1 +' of ice at 9 HC.C. Both 1 +' of ice at 9 HC and 1 +' of ice at 9 HC have the same volume.Correct Answer is. Both 1 +' of ice at 9 HC and 1 +' of ice at 9 HC have the same volume.Explanation. N%&.

. ,he temperature at which water will exist as a solid! li5uid and 'as! all at the same time! iscalled.A. the triple point and is approximately 9 HC.B. the tri-state point and is approximately at 9 HC.C. the tri-state point and is approximately 42 HC.Correct Answer is. the triple point and is approximately 9 HC.Explanation. N%&.


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2. 6aterial A and material B are both removed from the same oven at the same time! after bein' in the same amount of time. 6aterial A is a hi'her temperature than material B. ,his is because.A. material B has a hi'her specific heat capacity.B. material A must have had a hi'her temperature before it was put in the oven.

C. material A has a hi'her specific heat capacity.Correct Answer is. material A has a hi'her specific heat capacity.Explanation. N%&.

4. !"tics #$i%ht&.

1. #hat is the thic+ness of a sin'le mode fibre optic$.A. "99 micrometres.B. micrometres.

C. 9 micrometres.Correct Answer is. micrometres.Explanation. %ntroduction to ;iber )ptics 3rd Edition Tohn Crisp and Barry Elliot a'e .

". Miver'ent li'ht rays 'ive rise to.A. a real ima'e.B. a virtual ima'e.C. chromatic aberrations.Correct Answer is. a virtual ima'e.

Explanation. N%&.

3. %n fibreoptics the type of cable is chosen by.A. matchin' the diameter of the cable to the wavelen'th.B. distance re5uired to travel.C. the stren'th of si'nal needed.Correct Answer is. distance re5uired to travel.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp.

*. A material with a 'radually varyin' refractive index is said to have a.A. 'raded index.B. step index.C. sin'le index.Correct Answer is. 'raded index.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp.


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. ;ibre optic cables are capable of transmittin' li'ht at.A. 1.44 @ 192 m/s.B. 3 @ 192 m/s.

C. 9.44 @ 192 m/s.Correct Answer is. 1.44 @ 192 m/s.Explanation.


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4. ;or a concave lens the ima'e is.A. virtual.B. real.C. a chromatic orb.Correct Answer is. virtual.

Explanation. N%&.

19. %n a fibre optic flyin' control system.)ption A. the sensor and the transmitter re5uire electrical power.)ption B. the transmitter re5uires power.)ption C. the sensor re5uires electrical power.Correct Answer is. the sensor and the transmitter re5uire electrical power.Explanation. ,he transmitter is an &EM or laser 7both need power8 and the receiver is a

photodiode! which needs electrical power. %ntroduction to ;iber )ptics by Tohn Crisp.

11. hotons in a semiconductor are stimulated to produce excess photons to be emitted. ,his isa.A. photodiode.B. laser diode.C. &EM.Correct Answer is. laser diode.Explanation. &A


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1*. ,he fibre optic receiver is a.A. laser diode.B. photodiode.

C. li'ht emittin' diode.Correct Answer is. photodiode.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp.

1. Ie'enerators are used in fibre optic systems to reduce.A. dispersion.B. random emission.C. attenuation.

Correct Answer is. attenuation.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp.

1. #hen li'ht rays enter a medium with a different refractive index they.A. chan'e direction.B. reflect.C. chan'e speed.Correct Answer is. chan'e speed.Explanation. ,hey will only chan'e direction if they hit the surface at an an'le other than 9

de'rees 7to the normal8. %t will always chan'e speed however.

1. A conver'in' lens can focus li'ht rays because.A. the incomin' rays are already conver'in'.B. it is spherical.C. the li'ht rays travel more slowly at the centre.Correct Answer is. it is spherical.Explanation. A conver'in' lens is a part of a sphere! so li'ht rays hit it at different an'lesdependin' upon its distance from the principle axis.

12. %f a ray of li'ht enters a fibre optic cable with a refractive index of 1.! what is the speed ofthe ray in the cable$.A. 399!999 +ilometres per second.B. *99!999 +ilometres per second.C. "99!999 +ilometres per second.


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Correct Answer is. "99!999 +ilometres per second.Explanation. vacuum / speed of li'ht in medium. 1. 399!999 / C! C "99!999 +m/s.%ntroduction to ;iber )ptics by Tohn Crisp.

14. vacuum / speed of li'ht in medium. 1. 399!999 / C! C "99!999 +m/s. %ntroduction to;iber )ptics by Tohn Crisp.A. a constant refractive index across its cross sectional area.B. a variable refractive index across its cross sectional area.C. a sudden chan'e in refractive index.Correct Answer is. a variable refractive index across its cross sectional area.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp.

"9. A mirror.A. refracts all li'ht.B. reflects all li'ht.C. absorbs a percenta'e of li'ht.Correct Answer is. absorbs a percenta'e of li'ht.Explanation. N%&.

"1. ,he width of a multimode fibre optic cable 7includin' the claddin'8 is.A. 1 Xm.

B. 199 Xm.C. 19 Xm.Correct Answer is. 199 Xm.Explanation. ,his must be referrin' to the :overall: diameter - i.e that of the claddin'! since thecore is 9 or ". micrometers 7microns8. %ntroduction to ;iber )ptics by Tohn Crisp.

"". A varyin' refractive index optical fibre is a.A. sin'le index.B. 'raded index.C. step index.Correct Answer is. 'raded index.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp.

"3. Iefractive index is.A. the speed of li'ht in the medium divided by the speed of li'ht in air.


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B. the speed of li'ht in air divided by the speed of li'ht in the medium.C. the speed of li'ht in air multiplied by the speed of li'ht in the medium.Correct Answer is. the speed of li'ht in air multiplied by the speed of li'ht in the medium.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp pa'e 11.

"*. #hat is the speed of li'ht in +m/s$.A. 3999.B. 3 @ 192.C. 399999.Correct Answer is. 399999.Explanation. 399!999!999 m/s 399!999!999/1999 +m/s 399!999 +m/s. %ntroduction to ;iber)ptics by Tohn Crisp.

". ,he focal point of a mirror is.A. 1/" the radius.B. the radius.C. " @ the radius.Correct Answer is. 1/" the radius.Explanation. N%&.

". #hat is the speed of li'ht in air at 9 HC.

A. 331 m/s.B. 399 m/Xs.C. 331 mm/s.Correct Answer is. 399 m/Xs.Explanation.


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"2. #hen different si'nals are transmitted down a fibre optic core! are they distin'uished bya.A. active filter.B. passive filter.C. star coupler.

Correct Answer is. passive filter.Explanation. A :passive filter: simply sorts out and/or bloc+s certain wavelen'ths. An :activefilter: will catch certain wavelen'ths and convert them to other wavelen'th. %ntroduction to ;iber)ptics by Tohn Crisp.

"4. )n an )ptical ,ime Momain Ieflectometer 7),MI8! the amount of attenuation in the cableis.A. read from the cathode ray display.

B. derived from a 'raph.C. dialed into ),MI.Correct Answer is. read from the cathode ray display.Explanation.


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C. the li'ht waves are refracted less in the centre of the lens than they are at the extremities.Correct Answer is. the li'ht waves are refracted less in the centre of the lens than they are atthe extremities.Explanation. N%&.

33. %n fibre optics. ,he fibre cable has a refractive index of 1.! what is its speed$.A. 399 meters/microsecond.B. *99 meters/microsecond.C. "99 meters/microsecond.Correct Answer is. "99 meters/microsecond.Explanation. n speed of li'ht in vacuum / speed of li'ht in substance. 1. 399m permicrosecond / speed of li'ht in fibre. ,ranspose.. %ntroduction to ;iber )ptics by Tohn Crisp.

3*. A material! which has a varyin' refractive index is a.A. step index.B. sin'le index.C. double index.Correct Answer is. step index.Explanation. A varyin' refractive index is either :step index: or :'raded index:.


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could not ta+e a photo'raph of it.

3. #hen a beam of li'ht passes from one medium to another with a different refractive index!what will happen to the beam of li'ht$.

A. ,otal internal reflection.B. Chan'e speed.C. ,otal internal refraction.Correct Answer is. Chan'e speed.Explanation. A beam of li'ht passes from one medium to another - its speed will chan'e. ,hisis the only statement of certainty! since no information is 'iven about the an'le of incidence.

32. A fibre optic cable has different refractive indexes across its core diameter! it is a.

A. sin'le mode fibre.B. 'raded index fibre.C. step index fibre.Correct Answer is. 'raded index fibre.Explanation. A fibre optic with a different refractive index across its core diameter is a :'radedindex:. %ntroduction to ;iber )ptics by Tohn Crisp.

34. %ncident li'ht travellin' from air to water! the li'ht is.A. bent towards the normal.

B. not bent.C. bent away from the normal.Correct Answer is. bent towards the normal.Explanation. &i'ht travellin' from air to water! the waves are bent 7or an'led8 less whenmeasured to the normal.

*9. %f a li'ht is beamed at a flat mirror! what is the an'le it reflects at$.A. Ieflective index.B. An'le of incidence.C. Ieactive an'le.Correct Answer is. An'le of incidence.Explanation. ,he an'le the li'ht hits a mirror 7to the normal8 is the An'le of %ncidence. ,hean'le it bounces off 7to the normal8 is the An'le of Ieflection. ,he two an'les are always e5ual.

*1. %n a 'raded index multimode fibre is the refractive index.


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A. is hi'h.B. varies hi'h and low.C. is low.Correct Answer is. varies hi'h and low.Explanation. %n a 'raded index fibre optic cable! the refractive index is low at the ed'e! hi'h in

the centre and then low at the other ed'e. %ntroduction to ;iber )ptics by Tohn Crisp.

*". ,he fibre optic receiver is a.A. photodiode.B. laser diode.C. li'ht emittin' diode.Correct Answer is. photodiode.Explanation. ,he fibre optic receiver is a photo diode. %ntroduction to ;iber )ptics by TohnCrisp.

*3. ,he usable bandwidth of a fibre is determined by.A. the wavelen'th of the li'ht.B. the an'le of total internal reflection.C. the intermodal dispersion.Correct Answer is. the intermodal dispersion.Explanation. Bandwidth is the ran'e of fre5uencies that can be transmitted.


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*. ect. %t is therefore a virtual ima'e.

*2. %n a concave mirror! li'ht rays parallel to mirror axis will be reflected.A. throu'h the focal point.B. bac+ to the centre of curvature.C. parallel to mirror axis.

Correct Answer is. throu'h the focal point.Explanation. All the li'ht rays focus at the focal point.

*4. %n a concave mirror! a li'ht ray passin' throu'h the focal point will be reflected.A. throu'h the focal point.B. on the centre line of the mirror.C. parallel to the axis.Correct Answer is. parallel to the axis.Explanation. All rays which pass throu'h the focal point! reflect from the mirror then travel parallel to the axis.

9. A passive sensor.A. does not re5uire power.B. re5uires power for the sensor.C. re5uires power for the transmitter.


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Correct Answer is. does not re5uire power.Explanation. assive sensors do not re5uire power. %ntroduction to ;iber )ptics by Tohn Crisp.

1. Iefractive index is.

A. lower for *YC water than 9YC ice.B. hi'her for diamond than acrylic.C. hi'hest for water.Correct Answer is. hi'her for diamond than acrylic.Explanation. Miamond has the hi'hest refractive index. Note * HC. water is more dense thanice so has 'reater refractive index.

". ;or optical fibres! the refractive index of the claddin' compared to that of the core.

A. can be either bi''er or smaller dependin' on specification.B. is always smaller.C. is always lar'er.Correct Answer is. is always smaller.Explanation. Claddin' always has a lower refractive index. %ntroduction to ;iber )ptics byTohn Crisp.

3. ,he ability for a fibreoptic cable to carry waves is dependent on.A. material! absorption and speed of li'ht.

B. internal reflection.C. material! diameter and absorption.Correct Answer is. internal reflection.Explanation. ;iber optics carry li'ht by ,otal %nternal Ieflection. %ntroduction to ;iber )ptics by Tohn Crisp.

*. %n spherical aberrations.A. incident rays further from the axis intersect sli'htly closer to the lens to produce a distorted picture.B. incident rays further from the axis intersect sli'htly further away from the lens to produce adistorted picture.C. the bendin' of li'ht throu'h lens intersect at the same point 7achromatic lens8.Correct Answer is. incident rays further from the axis intersect sli'htly closer to the lens to produce a distorted picture.Explanation. N%&.


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. %n a fibre optic flyin' control system.A. the sensor and transmitter re5uire electrical power.B. the sensor inputs to the transmitter which needs electrical power.C. the sensor needs electrical power.

Correct Answer is. the sensor and transmitter re5uire electrical power.Explanation. ,he sensor is a photodiode or a %N diode 7needs power8 and the transmitter is an&EM or laser 7needs power8. %ntroduction to ;iber )ptics by Tohn Crisp.

. %n fibreoptics! the type of cable is chosen by.A. the stren'th of si'nal needed.B. matchin' the diameter of the cable with the wavelen'th.C. distance re5uired to travel.

Correct Answer is. distance re5uired to travel.Explanation. ,ype of cable 7not the diameter8 - sin'le mode! multimode or 'raded index etc. ischosen for its attenuation and hence len'th. %ntroduction to ;iber )ptics by Tohn.

. #hen refraction ta+es place.A. the fre5uency remains constant.B. the speed of the wave remains constant.C. the wavelen'th remains constant.Correct Answer is. the fre5uency remains constant.

Explanation. ;re5uency remains constant.

2. #hen li'ht meets a lass / Air boundary at an an'le of incidence less than the criticalan'le.A. ,otal %nternal Ieflection ta+es place.B. no li'ht is reflected.C. both reflection and refraction ta+es place.Correct Answer is. both reflection and refraction ta+es place.Explanation. Even at an'les less than the critical! a small portion of the li'ht in reflected%ntroduction to ;iber )ptics by Tohn Crisp.

4. An ob>ect placed more than twice the focal len'th beyond a conver'in' lens will form anima'e that is.A. inverted! lar'er and virtual.B. inverted! smaller and real.


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C. erect! smaller and real.Correct Answer is. inverted! smaller and real.Explanation. N%&.

9. A parabolic mirror may be used to prevent.A. lateral inversion.B. spherical aberration.C. formation of a penumbra.Correct Answer is. spherical aberration.Explanation. N%&.

1. ,he refractive index for air is approximately.

A. 1.B. 19.C. 9.Correct Answer is. 1.Explanation. %ntroduction to ;iber )ptics by Tohn Crisp.

". %n optical fibres the total internal reflection of li'ht only occurs at an'les.A. less than the critical an'le.B. e5ual to the critical an'le.

C. 'reater than the critical an'le.Correct Answer is. 'reater than the critical an'le.Explanation. Iemember that the critical an'le is measured from the normal 7or

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