Reflection of Light - Multiple Choice Test Question 1 Question: Light is a form of energy produced by a ______. 1 . luminous object 2 . transparent object 3 . non-luminous object 4 . opaque object 1.luminous object2.transparent object3.non-luminous object4.opaque object Answer: 1 Question 2 Question: An example for non-luminous object is ___________. 1 . a candle 2 . the sun 3 . an electric bulb 4 . the moon Answer: 4 Question 3 Question: The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ________. 1 . polariza tion 2 . reflecti on 3 . refracti on 4 . absorpti on
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Reflection of Light - Multiple Choice Test
Question 1Question: Light is a form of energy produced by a ______.
1. luminous object2. transparent object3. non-luminous object4. opaque object1.luminous object2.transparent object3.non-luminous object4.opaque object Answer: 1Question 2Question: An example for non-luminous object is ___________.
1. a candle2. the sun3. an electric bulb4. the moon
Answer: 4Question 3Question: The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ________.
Answer: 1Question 16Question: An object is placed 1.5 m from a plane mirror. How far is the image from the person?
1. 3 m2. 1.5 m3. 2 m4. 1 m
Answer: 1Question 17Question: An object placed 2m from a plane mirror is shifted by 0.5 m away from the mirror. What is the distance between the object and its image?
1. 2 m2. 1.5 m3. 5 m
4. 3 m
Answer: 3Question 18Question: What is the value of q in the following diagram?
1. 30o
2. 45o
3. 90o
4. 60o
Answer: 4Question 19Question: What is the angle between the incident and reflected rays when a ray of light is incident normally on a plane mirror?
1. 90o
2. 45o
3. 180o
4. 0
Answer: 4Question 20Question: Name the type of image that can be obtained on a screen.
1. Virtual2. Real3. Diverging4. Converging
Answer: 2Question 21Question: A ray of light is incident on a plane mirror and the angle of incidence is 25o. What is the angle of reflection?
1. 02. 50o
3. 90o
4. 25o
Answer: 4
Question 22Question: A ray of light is incident on a plane mirror and the angle of reflection is 50o. Calculate the angle between the incident ray and the reflected ray.
1. 50o
2. 25o
3. 90o
4. 100o
Answer: 4Question 23Question: Which of the following is used to make a periscope?
Answer: 3Question 27Question: A ray of light passing through the _______ retraces its path.
1. focus2. centre of curvature3. pole4. vertex
Answer: 2Question 28Question: When an object is placed at the focus of a concave mirror, the image will be formed at ________.
1. infinity2. focus3. centre of curvature4. pole
Answer: 1Question 29Question: Butter paper is an example for _______ object.
1. a transparent2. a translucent3. an opaque4. a luminous
Answer: 2Question 30Question: An object of size 2.0 cm is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror equals to the radius of curvature. The size of the image will be ______________.
1. 0.5 cm2. 1.5 cm3. 1.0 cm4. 2.0 cm
Answer: 4Question 31Question: If an incident ray passes through the centre of curvature of a spherical mirror, the reflected ray will __________________.
1. pass through the focus2. pass through the centre of curvature3. pass through the pole4. retrace its path
Answer: 4Refraction of Light - Multiple Choice Test
Question 1Question: The bending of a beam of light when it passes obliquely from one medium to another is known as _______.
Answer: 2Question 2Question: The part of the lens through which the ray of light passes without suffering deviation is called ________.
1. optical centre2. focus3. centre of curvature4. pole Answer: 1Question 3Question: Convex lens always gives a real image if the object is situated beyond _______.
1. optical centre2. centre of curvature3. focus4. radius of curvature
Answer: 3Question 4Question: Parallel rays of light entering a convex lens always converge at _______.
1. centre of curvature2. the principal focus3. optical centre4. the focal plane
Question 5Question: Where should an object be placed so that a real and inverted image of the same size is obtained, using a convex lens?
1. Between O and F2. At F3. At 2 F4. At infinity
Answer: 3Question 6Question: SI unit of the power of a lens is ___________.
1. dioptre2. cm3. metre4. watt
Answer: 1Question 7Question: 1 D is the power of the lens of focal length of ______ cm.
1. 1002. 103. 1/1004. 1/10
Answer: 1Question 8Question: In a simple microscope lens used is __________.
1. biconvex2. biconcave3. plano convex4. cylindrical
Answer: 1Question 9Question: Reciprocal of focal length in metres is known as the ______ of a lens.
1. focus2. power3. power of accommodation4. far point
Answer: 2Question 10Question: A convex lens is called _________.
1. converging lens2. diverging lens3. both converging and diverging lens4. refracting lens
Answer: 1Question 11Question: A positive magnification greater than unity indicates _____________________.
1. real image2. virtual image3. neither real not virtual image4. distorted image
Answer: 2Question 12Question: The power of a convex lens of focal length 50 cm is ______.
1. + 2D2. - 2D3. 50 D4. - 5D
Answer: 1Question 13Question: The focal length of a lens whose power is -1.5 D is _______.
1. -66.66 cm2. + 1.5 m3. + 66.66 cm4. -1.5 m
Answer: 1
Question 14Question: Real images formed by single convex lenses are always ________________.
1. on the same side of the lens as the object2. inverted3. erect4. smaller than the object
Answer: 2Question 15Question: An object is placed 12 cm from a convex lens whose focal length is 10 cm. The image must be.
1. virtual and enlarged2. virtual and reduced in size3. real and reduced in size4. real and enlarged
Answer: 4Question 16Question: When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance.
1. less than one focal length2. more than one focal length3. less than twice the focal length4. more than twice the focal length
Answer: 1Question 17Question: The image produced by a concave lens is ________.
1. always virtual and enlarged2. always virtual and reduced in size3. always real4. sometimes real, sometimes virtual
Answer: 2Question 18Question: A virtual image is formed by _______.
1. a slide projector in a cinema hall2. the ordinary camera3. a simple microscope4. telescope
Answer: 3Question 19Question: An object is placed 25 cm from a convex lens whose focal length is 10 cm. The image distance is ________ cm.
1. 50 cm2. 16.66 cm3. 6.66 cm
4. 10 cm
Answer: 2Question 20Question: The least distance of distinct vision is ______.
1. 25 cm2. 25 m3. 0.25 cm4. 2.5 m
Answer: 1Question 21Question: A convex lens has a focal length of 20 cm. Its power in dioptres is ___________.
1. 22. 53. 0.54. 0.2
Answer: 2Question 22Question: An object is placed before a concave lens. The image formed _____________-.
1. is always erect2. may be erect or inverted3. is always inverted4. is always real
Answer: 1Question 23Question: A ray of light travels from a medium of refractive index n1 to a medium of refractive index n2. If angle of incidence is i and the angle of refraction is r.
Then is equal to
1. n1
2. n2
3. n21
4. n12
Answer: 3Question 24Question: Two thin lenses of power +5 D and -2 D are placed in contact with each other. Focal length of the combination is
1. +3 m2. -3 m3. 0.33 m4. -0.33 m
Answer: 3Question 25Question: The lens formula in cartesian frame is ______________.
1.
2.
3.
4.
Answer: 3The Human Eye and the Colourful World - Multiple Choice Test
Question 1Question: The change in focal length of an eye lens to focus the image of objects at varying distances is done by the action of ________.
1. pupil2. ciliary muscles3. retina4. blind spot
Answer: 2Question 2Question: Far point of a normal eye is situated at _________.
1. 25 cm2. infinity3. 50 cm4. 400 cm
Answer: 2Question 3Question: A long-sighted person cannot see objects nearer to his eye than 50 cm. To enable him to read a book 25 cm away, he should use spectacle lenses whose power in dioptres is ____.
1. -62. -43. -24. + 4
Answer: 4Question 4Question: The process by which a beam of white light splits into its constituent colours is known as _________.
Answer: 2Question 13Question: Two thin lenses of power +5D and -2D are put in contact with each other. Focal length of the combination is
1. +3 m2. -3 m3. 0.33 m4. -0.33 m
Answer: 3Question 14Question: The least distance of distinct vision for infants is _________.
1. 15 cm2. 20 cm3. 25 cm4. 5 cm
Answer: 4Question 15Question: The focal length of a lens whose power is -1.5 D is _______.
1. -66.66 cm2. + 1.5 m3. + 66.66 cm4. -1.5 m
Answer: 1Sound - Multiple Choice Test
Question 1Question: When a wave travels through a medium ______.
1. particles are transferred from one place to another2. energy is transferred in a periodic manner
3. energy is transferred at a constant speed4. none of the above statements is applicable
Answer: 3Question 2Question: The minimum distance between the source and the reflector, so that an echo is heard is approximately equal to ______.
1. 10 m2. 17 m3. 34 m4. 50 m
Answer: 2Question 3Question: Bats detect the obstacles in their path by receiving the reflected ______.
1. infrasonic waves2. radio waves3. electro-magnetic waves4. ultrasonic waves
Answer: 4Question 4Question: When sound travels through air, the air particles ______.
1. vibrate along the direction of wave propagation2. vibrate but not in any fixed direction3. vibrate perpendicular to the direction of wave propagation4. do not vibrate
Answer: 1Question 5Question: The relation between wave velocity 'v', frequency 'f ', and wavelength 'l' is ______.
1.
2.
3.
4.
Answer: 2Question 6Question: The frequency of a wave travelling at a speed of 500 ms-1 is 25 Hz. Its time
period will be ______.
1. 20 s2. 0.05 s
3. 25 s4. 0.04 s
Answer: 4Question 7Question: The amplitude of a wave is ______.
1. the distance the wave moves in one second2. the distance the wave moves in one time period of the wave3. the maximum distance moved by the medium particles on either side of the mean position4. the distance equal to one wave length
Answer: 3Question 8Question: Which of the following is not a characteristic of a musical sound?
1. Pitch2. Wavelength3. Quality4. Loudness
Answer: 2Question 9Question: Sound waves do not travel through
1. solids2. liquids3. gases4. vacuum
Answer: 4Question 10Question: The physical quantity, which oscillates in most waves, is
1. mass2. energy3. amplitude4. wavelength
Answer: 3Question 11Question: Sound waves are
1. longitudinal2. transverse3. partly longitudinal and partly transverse4. sometimes longitudinal and sometimes transverse
Answer: 1Question 12Question: The frequency which is not audible to the human ear is
1. 50 Hz2. 500 Hz
3. 5000 Hz4. 50000 Hz
Answer: 4Question 13Question: The speed of sound in medium depends upon
1. amplitude2. frequency3. wavelength4. properties of the medium
Answer: 4Question 14Question: Which of the following will remain unchanged when a sound wave travels in air or in water?
1. Amplitude2. Wavelength3. Frequency4. Speed
Answer: 3Question 15Question: A sound source sends waves of 400 Hz. It produces waves of wavelength 2.5 m. The velocity of sound waves is
1. 100 m/s2. 1000 m/s3. 10000 m/s4. 3000 km/s
Answer: 2Question 16Question: The time period of a vibrating body is 0.05 s. The frequency of waves it emits is
1. 5 Hz2. 20 Hz3. 200 Hz4. 2 Hz
Answer: 2Question 17Question: A source of frequency of 500 Hz emits waves of wavelength 0.4 m, how long does the waves take to travel 600 m?
1. 3 s2. 6 s3. 9 s4. 12 s
Answer: 1Question 18Question: Sound and light waves both
1. have similar wavelength2. obey the laws of reflection3. travel as longitudinal waves4. travel through vacuum
Answer: 2Question 19Question: The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound waves is known as _____.
1. RADAR2. SONAR3. MIR4. CRO
Answer: 2Question 20Question: The technique used by bats to find their way or to locate food is _______.
1. SONAR2. RADAR3. Echolocation4. Flapping
Answer: 3Question 21Question: An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and receiving of the wave is 1.6 s. What is the depth of the sea, if the velocity of sound in the seawater is 1400 m/s?
1. 1120 m2. 560 m3. 1400 m4. 112 m
Answer: 1Question 22Question: An example for mechanical wave.
1. Radio wave2. Light wave3. Infrared radiation4. Sound wave
Answer: 4Question 23Question: Which of the following quantities is transferred during wave propagation?
1. Speed2. Mass3. Matter4. Energy
Answer: 4Question 24
Question: If a vibrator strikes the water 10 times in one second, then the frequency of wave is _________.
1. 10 Hz2. 0.5 Hz3. 5 Hz4. 0.1 Hz
Answer: 1Question 25Question: Unit of wavelength is __________.
1. newton2. erg3. dyne4. angstrom
Answer: 4Question 26Question: The distance between a compression and the next rarefaction of a longitudinal wave is __________.
1.
2. 2l
3.
4.
Answer: 3Question 27Question: SI Unit of time period is __________.
1. second2. hour3. minute4. nanosecond
Answer: 1Question 28Question: The vibrations or the pressure variations inside the inner ear are converted into electrical signals by the_________.
1. cochlea2. tympanic membrane3. pinna4. anvil
Answer: 1
Question 29Question: Vibrations inside the ear are amplified by the three bones namely the _________ in the middle ear.
1. hammer, anvil and stirrup2. hammer, anvil and pinna3. hammer, cochlea and stirrup4. auditory bone, anvil and stirrup
Answer: 1Question 30Question: The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called _________.
Answer: 3Force and Laws Of Motion - Multiple Choice Test
Question 1Question: Inertia is ________
1. a property of matter2. a type of force3. the speed of an object4. none of the above
Answer: 1Question 2Question: A and B are two objects with masses 100 kg and 75 kg respectively, then ________ .
1. both will have the same inertia2. B will have more inertia3. A will have more inertia4. both will have less inertia
Answer: 3Question 3Question: The resultant of balanced forces is ________
1. non zero2. equal to zero3. not equal to zero4. equal to the acceleration produced in the body
Answer: 2Question 4Question: The physical quantity, which is the measure of inertia, is ________
1. density
2. weight3. force4. mass
Answer: 4Question 5Question: The sparks produced during sharpening of a knife against a grinding wheel leaves the rim of the wheel tangentially. This is due to ________
1. inertia of rest2. inertia of motion3. inertia of direction4. force applied
Answer: 3Question 6Question: The law that gives a qualitative definition of force is ________
1. Newton's second law of motion2. Law of inertia3. Newton's third law of motion4. Law of gravitation
Answer: 2Question 7Question: Name the property of matter due to which a body continues in its state of rest or uniform motion unless an external force acts on it.
1. Inertia2. Elasticity3. Viscosity4. Density
Answer: 1Question 8Question: The S.I. unit of force is
1. erg2. joule3. newton4. dyne
Answer: 3Question 9Question: When a force of 1N acts on a mass of 1kg that is free to move, the object moves with
1. a speed of 1 m/s2. a speed of 1 km/s3. an acceleration 10 m/s2
4. an acceleration of 1 m/s2
Answer: 4Question 10
Question: The acceleration in a body is due to
1. balanced force2. unbalanced force3. mass4. electrostatic force
Answer: 2Question 11Question: When an object undergoes acceleration
1. its speed always increases2. its velocity always increases3. it always falls towards the Earth4. a force always acts on it
Answer: 4Question 12Question: A force of 10 N is acting on an object of mass 10 kg. What is the acceleration produced in it?
1.
2.3. 100 m/s2
4. 100 m/s
Answer: 1Question 13Question: What is the force acting on an object of mass 10 kg moving with a uniform velocity of 10 m/s ?
1. 100 N2. 10 N3. 04. 1 N
Answer: 3Question 14Question: An athlete can take a longer jump if he comes running from a distance as compared to that when he jumps suddenly. Identify the type of inertia.
1. Inertia of rest2. Inertia of motion3. Inertia of direction4. Inertia of position
Answer: 2Question 15Question: 1 newton = ________
1.
2.
3.
4.
Answer: 2Question 16Question: The physical quantity, which is equal to change in momentum, is
1. force2. impulse3. acceleration4. velocity
Answer: 2Question 17Question: The physical quantity, which is equal to rate of change of momentum, is
1. displacement2. acceleration3. force4. impulse
Answer: 3Question 18Question: 1kg m/s = _________.
1. 1 N s2. 1 N3. 1 N m4. 10 N s
Answer: 1Question 19Question: An example for a vector quantity is __________
Answer: 1Question 7Question: A coolie carries a load of 500 N to a distance of 100 m. The work done by him is
1. 5 N2. 50,000 Nm3. 04. 1/5 N
Answer: 3Question 8Question: The P.E. of a body at a certain height is 200 J. The kinetic energy possessed by it when it just touches the surface of the earth is
1. > P.E.2. < P.E.3. = P.E.4. cannot be known
Answer: 1Question 9Question: Power is a measure of the _______
1. rate of change of momentum2. force which produces motion3. change of energy4. rate of change of energy
Answer: 4Question 10Question: Two objects of masses 1 x 10-3 kg and 4 x 10-3 kg have equal momentum. What is the ratio of their kinetic energies?
1. 4:12. 2:1
3. 16:1
4.
Answer: 1Question 11Question: A 40 newton object is released from a height of 10 m. Just before it hits the ground, its kinetic energy, in joules is _______
1. 4002. 39203. 28004. 4000
Answer: 1Question 12Question: If the speed of an object is doubled then its kinetic energy is _______
Answer: 1Question 14Question: A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s2)
1. 50 J2. 60 J3. 500 J4. 600 J
Answer: 3Question 15Question: The type of energy possessed by a simple pendulum, when it is at the mean position is
1. kinetic energy2. potential energy3. potential energy + kinetic energy4. sound energy
Answer: 1Question 16
Question: An iron sphere of mass 30 kg has the same diameter as an aluminium sphere whose mass is 10.5 kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they have the same _______.
1. acceleration2. momentum3. potential energy4. kinetic energy
Answer: 1Question 17Question: A 1 kg mass has a kinetic energy of 1 joule when its speed is
1. 0.45 m/s2. 1 m/s3. 1.4 m/s4. 4.4 m/s
Answer: 3Question 18Question: If air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body _______
1. increases2. decreases3. becomes zero4. remains the same
Answer: 4Question 19Question: Name the physical quantity which is equal to the product of force and velocity.
1. work2. energy3. power4. acceleration
Answer: 3Question 20Question: An object of mass 1 kg has potential energy of 1 joule relative to the ground when it is at a height of _______.
1. 0.102 m2. 1 m3. 9.8 m4. 32 m
Answer: 1Electricity - Multiple Choice Test
Question 1Question: Which of the following statements does not represent ohm's law?
1. current / potential difference = constant2. potential difference / current = constant
3. potential difference = current x resistance4. current = resistance x potential difference
Answer: 4Question 2Question: The unit of current is _____________.
1. ampere2. watt3. volt4. coulomb
Answer: 1Question 3Question: The potential difference required to pass a current 0.2 A in a wire of resistance 20W is ____.
1. 100 V2. 4 V3. .01 V4. 40 V
Answer: 2Question 4Question: The resistance of an electric bulb drawing 1.2 A current at 6.0 V is ___________.
1. 0 .5 W2. 5 W3. 0.2 W4. 2 W
Answer: 2Question 5Question: The unit of resistivity is ____________.
1. ohm2. ohm / m3. ohm-m4. mho
Answer: 3Question 6Question: Two resistances of 100 W and zero ohm are connected in parallel. The overall resistance will be
1. 100 W2. 50 W3. 25 W4. zero ohm
Answer: 1Question 7Question: Three resistors 2 W , 3 W and 4 W are connected so that the equivalent resistance is 9 W . The resistors are connected _________.
1. all in series2. all in parallel3. 2 W and 3 W in parallel and the combination in series with 4 W4. 2 W and 3 W in series and the combination in parallel to 4 W
Answer: 1Question 8Question: In the figure,
1. 6 W , 3 W and 9 W are in series2. 9 W and 6 W are in parallel and the combination is in series with 3 W3. 3 W , 6 W and W are in parallel4. 3 W , 6 W are in parallel and 9 W is in series
Answer: 4Question 9Question: The resistance across AB is
1. 4 2. 1 3. 2 4. 0 .5
Answer: 2Question 10Question: When a current 'I' flows through a resistance 'R' for time 't' the electrical energy spent is given by ___________.
1. I R t2. I2 R t3. I R2 t4. I 2 R / t
Answer: 2
Question 11Question: Kilowatt - hour is the unit of ______________.
1. potential difference2. electric power3. electrical energy4. charge
Answer: 3Question 12Question: When a fuse is rated 8 A, it means _____________.
1. it will not work if current is less than 8 A2. it has a resistance of 8 W3. it will work only if current is 8 A4. it will melt if current exceeds 8 A
Answer: 4Question 13Question: The device used for measuring potential difference is known as _____________.
Answer: 4Question 14Question: The work done in moving a unit positive charge across two points in an electric circuit is a measure of ___________.
1. current2. potential difference3. resistance4. power
Answer: 2Question 15Question: The potential at a point is 20 V. The work done to bring a charge of 0.5 C from infinity to this point will be ________.
1. 20 J2. 10 J3. 5 J4. 40 J
Answer: 2Question 16Question: Joule / Coulomb is same as ______________.
1. watt2. volt3. ampere
4. ohm
Answer: 2Question 17Question: The free electrons of a metal _____________.
1. do not collide with each other2. are free to escape through the surface3. are free to fall into the nuclei4. are free to move anywhere in the metal
Answer: 4Question 18Question: The path of a free electron in a metal is ___________.
1. parabolic2. circular3. a straight line4. zig zag
Answer: 4Question 19Question: Heat produced in a current carrying wire in 5s is 60 J. The same current is passed through another wire of half the resistance. The heat produced in 5 s will be _____________.
1. 60 J2. 30 J3. 15 J4. 120 J
Answer: 2Question 20Question: The current in a wire ______________.
1. depends only on the potential difference applied2. depends only on the resistance of the wire3. depends on both resistance and potential difference4. does not depend on resistance and potential difference
Answer: 3Question 21Question: When there is an electric current passing through a wire, the particles moving are _____________.
1. electrons2. protons3. atoms4. ions
Answer: 1Question 22Question: A positive charge released from rest __________.
1. moves towards the regions of lower potential2. moves towards the regions of higher potential
3. moves towards the regions of equal potential4. does not move
Answer: 1Question 23Question: Three equal resistances when combined in series are equivalent to 90 W . Their equivalent resistance when combined in parallel will be __________.
1. 270 W2. 30 W3. 810 W4. 10 W
Answer: 4Question 24Question: An battery is used to ________________.
1. maintain a potential difference2. measure electric current3. measure electric potential4. safeguard against short - circuit
Answer: 1Question 25Question: Ohm's law relates potential difference with ___________.
1. power2. energy3. current4. time
Answer: 3Question 26Question: Which of the following is an ohmic resistor?
1. Diode2. Germanium3. Nichrome4. Diamond
Answer: 3Question 27Question: The resistivity of a wire depends on ____.
1. length2. material3. area of cross- section4. length, material and area of cross- section
Answer: 4Question 28Question: For which of the following substances, resistance decreases with temperature?
1. Copper
2. Platinum3. Mercury4. Carbon
Answer: 4Question 29Question: Four cells each of e.m.f 'E' are joined in parallel to form a battery. The equivalent e.m.f of the battery will be _______.
1. 4 E2. E3. E / 44. E = 0
Answer: 2Question 30Question: Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them are in the ratio _________.
1. 1:22. 2:13. 4:14. 1:1
Answer: 2Magnetic Effects of Electric Current - Multiple Choice Test
Question 1Question: A magnetic field line is used to find the direction of
1. south-north
2. a bar magnet
3. a compass needle
4. magnetic field
Answer: 4Question 2Question: An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure.
What is your observation?
1. The needle will not deflect
2. Only one of the needles will deflect
3. Both the needles will deflect in the same direction
4. The needles will deflect in the opposite directions
Answer: 4Question 3Question: The magnetic field lines due to a straight wire carrying a current are
1. straight
2. circular
3. parabolic
4. elliptical
Answer: 2Question 4Question: Magnetic field produced at the centre of a current carrying circular wire is
1. directly proportional to the square of the radius of the circular wire
2. directly proportional to the radius of the circular wire
3. inversely proportional to the square of the radius of the circular wire
4. inversely proportional to the radius of the circular wire
Answer: 4Question 5Question: The magnetic field lines inside a long, current carrying solenoid are nearly
1. straight
2. circular
3. parabolic
4. elliptical
Answer: 1Question 6Question: A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid
1. will become zero
2. will decrease
3. will increase
4. will remain unaffected
Answer: 3Question 7Question: The direction of the force on a current-carrying wire placed in a magnetic field depends on
1. the direction of the current
2. the direction of the field
3. the direction of current as well as field
4. neither the direction of current nor the direction of field
Answer: 3Question 8Question: The direction of induced curent is obtained by
1. Fleming's left-hand rule
2. Maxwell's right-hand thumb rule
3. Ampere's rule
4. Fleming's right-hand rule
Answer: 4Question 9Question: Who first discovered the relationship between electricity and magnetism?
1. Faraday
2. Newton
3. Maxwell
4. Oersted
Answer: 4Question 10Question: In an electric motor, the energy transformation is from
1. electrical to chemical
2. chemical to light
3. mechanical to electrical
4. electrical to mechanical
Answer: 4Question 11Question: A commutator changes the direction of current in the coil of
1. a DC motor
2. a DC motor and an AC generator
3. a DC motor and a DC generator
4. an AC generator
Answer: 3Question 12Question: Which of the following devices works on the principle of electromagnetic induction?
1. Ammeter
2. Voltmeter
3. Generator
4. Galvanometer
Answer: 3Question 13Question: A device used for measuring small currents due to changing magnetic field is known as
1. galvanometer
2. ammeter
3. voltmeter
4. potentiometer
Answer: 1Question 14Question: An electric generator actually acts as
1. source of electric charge
2. source of heat energy
3. an electromagnet
4. a converter of energy
Answer: 4Question 15Question: Electromagnetic induction is the
1. charging of a body with a positive charge
2. production of current by relative motion between a magnet and a coil
3. rotation of the coil of an electric motor
4. generation of magnetic field due to a current carrying solenoid
Answer: 2Question 16Question: For making a strong electromagnet, the material of the core should be
1. soft iron
2. steel
3. brass
4. copper
Answer: 1Question 17Question: Magnetic field inside a long solenoid carrying current is
1. same at all points (uniform)
2. different at poles and at the centre
3. zero
4. different at all points
Answer: 1Question 18Question: You have a coil and a bar magnet. You can produce an electric current by
1. moving the magnet but not the coil
2. moving the coil but not the magnet
3. moving either the magnet or the coil
4. using another DC source
Answer: 3
Question 19Question: Which of the following describes the common domestic power supplied in India?
1. 220 V, 100 Hz
2. 220 V, 50 Hz
3. 110 V, 100 Hz
4. 100 V, 50 Hz
Answer: 2Question 20Question: A fuse in an electric circuit acts as a
1. current multiplication
2. voltage multiplication
3. power multiplier
4. safety device
Answer: 4Question 21Question: The magnetic lines of force inside a current carrying solenoid are
1. along the axis and parallel to each other
2. perpendicular to the axis and parallel to each other
3. circular and do not intersect each other
4. circular and intersect each other
Answer: 1Question 22Question: When the main switch of the house is put off, it disconnects
1. live wire
2. neutral wire
3. earth wire
4. live and neutral wires
Answer: 4Question 23Question: Kilowatt-hour is the unit of
1. potential difference
2. electric power
3. electrical energy
4. charge
Answer: 3Question 24Question: When a fuse is rated 8A, it means
1. it will not work if current is less than 8A
2. it has a resistance of 8
3. it will work only if current is 8A
4. it will burn if current exceeds 8A
Answer: 4Gravitation - Multiple Choice Test
Question 1Question: SI unit of gravitational constant is __________.
1. N m2kg2
2. N m2kg-2
3. N m2s-2
4. N mkg-2
Answer: 2Question 2Question: What is the value of gravitational constant?
1. 6.6734x10-11N m2/kg2
2. 6.6734x10-10N m2/kg2
3. 6.6734x10-11N m/kg2
4. 6.6734x10-11N m2/kg
Answer: 1Question 3Question: If the distance between two bodies is doubled, the force of attraction F between them will be _______
1. 1/4 F
2. 2 F
3. 1/2 F
4. F
Answer: 1Question 4Question: The force of gravitation between two bodies in the universe does not depend on
1. the distance between them
2. the product of their masses
3. the sum of their masses
4. the gravitational constant
Answer: 3Question 5Question: Name the fundamental force which holds the planets in their orbits around the sun.
1. Gravitational force of attraction
2. Electrostatic static force of attraction
3. Nuclear force of attraction
4. Electro static force of attraction
Answer: 1Question 6Question: When an object is thrown up, the force of gravity _________.
1. is opposite to the direction of motion
2. is in the same direction as the direction of motion
3. becomes zero at the highest point
4. increases as it rises up
Answer: 1Question 7Question: What is the final velocity of a body moving against gravity when it attains the maximum height?
1. Zero
2.
3.
4. 2gh
Answer: 1Question 8Question: A stone is dropped from a cliff. Its speed after it has fallen 100 m is
1. 9.8 m/s
2. 44.2 m/s
3. 19.6 m/s
4. 98 m/s
Answer: 2Question 9Question: A ball is thrown up and attains a maximum height of 100 m. Its initial speed was
1. 9.8 m/s
2. 44.2 m/s
3. 19.6 m/s
4. 98 m/s
Answer: 2Question 10Question: A stone dropped from the roof of a building takes 4 seconds to reach the ground. What is the height of the building?
1. 19.6 m
2. 39.2 m
3. 156.8 m
4. 78.4 m
Answer: 4Question 11Question: The acceleration due to gravity is zero at ______.
1. the equator
2. poles
3. sea level
4. the centre of the earth
Answer: 4Question 12Question: If acceleration due to gravity on earth is 10 m/s2 then, the acceleration due to gravity on moon is ________.
1. 1.66 m/s2
2. 16.6 m/s2
3. 10 m/s2
4. 0.166 m/s2
Answer: 1Question 13Question: The second equation of motion for a freely falling body starting from rest is _______.
1.
2.
3.
4.
Answer: 3Question 14Question: The acceleration due to gravity of a body moving against gravity is
1. 9.8 m/s2
2. -9.8 m/s2
3.
4. 9.6 m/s
Answer: 2Question 15Question: A feather and a coin released simultaneously from the same height do not reach the ground at the same time because of the _______.
1. resistance of the air
2. force of gravity
3. force of gravitation
4. difference in mass
Answer: 1Question 16Question: The weight of an object of mass 10 kg on earth is_______.
1. 9.8 N
2. 9.8 kg
3. 98 N
4. 98 kg
Answer: 3Question 17Question: The weight of an object of mass 15 kg at the centre of the earth is _____.
1. 147 N
2. 147 kg
3. zero
4. 150 N
Answer: 3Question 18Question: Mass remains ______ throughout the universe.
Answer: 1Question 21Question: How much would a man, whose mass is 60 kg weigh on the moon?
1. 9.8 N
2. 600 N
3. 60 N
4. 98 N
Answer: 4Question 22Question: What is the mass of an object whose weight on earth is 196 N?
1. 20 kg
2. 0.20 kg
3. 1960 kg
4. 2 kg
Answer: 1Question 23Question: The upward force acting on an object submerged in a liquid is ______.
1. thrust
2. buoyant force
3. pressure
4. force of friction
Answer: 2Question 24Question: The normal force per unit area is called _______.
1. pressure
2. thrust
3. balanced force
4. pascal
Answer: 1Question 25Question: If the mass of a ball is 5 kg on earth, then what would be its mass on Jupiter?
1. 5 kg
2. 5000 kg
3. 40000 kg
4. 50 kg
Answer: 1Motion - Multiple Choice Test
Question 1Question: 1 km/h = _____ m/s
1.
2.
3.
4.
Answer: 1Question 2Question: The distance (s) in metres travelled by a particle is related to time (t) in seconds by the equation of motion -S = 10t + 4t2. What is the initial velocity of the body?
1. 10 m/s2. 6 m/s
3. 4 m/s4. 10 m/s2
Answer: 1Question 3Question: For the equation - S = 10t + 4t2 what is the acceleration of the body?
1. 8 m/s2
2. 10 m/s2
3. 4 m/s2
4. 8 m/s
Answer: 1Question 4Question: A body moving along a straight line at 20 m/s decelerates at the rate of 4 m/s2. After 2 seconds its speed will be equal to
1. 8 m/s2. 12 m/s3. 16 m/s4. - 12 m/s
Answer: 2Question 5Question: Give the equation of motion connecting u, v, a and s where the symbols have their usual meaning
1. v = u + at
2.
3. v2 - u2 = 2aS
4.
Answer: 3Question 6Question: An object moving with a speed of 5 m/s comes to rest in 10 s, after the brakes are applied. What is the initial velocity?
1. zero2. 5 m/s3. 15 m/s4. 50 m/s
Answer: 2Question 7Question: A body moving along a straight line at 40 m/s undergoes an acceleration of 4 m/s2. After 10 seconds its speed will be
1. 20 m/s2. 28 m/s3. 16 m/s4. 80 m/s
Answer: 4Question 8Question: SI unit of acceleration is __________.
1.
2.
3.
4.
Answer: 1Question 9Question: Retardation is __________.
Answer: 2Question 12Question: Speed of 90 km/h when expressed in m/s is .
1. 2.52. 253. 2504. 90000
Answer: 2Question 13Question: When a graph of one quantity versus another results in a straight line, the quantities are .
1. directly proportional2. constant
3. inversely proportional4. independent of each other
Answer: 1Question 14Question: What does the following S-t graph indicate?
1. uniform speed2. body is at rest3. non-uniform speed4. variable speed
Answer: 2Question 15Question: What do you infer, if S-t graphs of two cyclists meet at a point?
1. They collide2. They pass each other3. They are at rest4. They are starting from rest
Answer: 2Question 16Question: Name the physical quantity which we get from a S-t graph.
1. Speed2. Displacement3. Distance4. Time
Answer: 1Question 17Question: What is the SI unit of speed?
1. km/h2. m/s3. m/min4. km/s
Answer: 2Question 18Question: What is the distance covered by a car in 5 h if it is moving with a speed of 35 km/h?
1. 175 km
2. 150 km3. 7 km4. 1750 km
Answer: 1Question 19Question: The S-t graph for uniform speed is
1.
2.
3.
4.
Answer: 2Question 20Question: The average speed of a car which covers half the distance with a speed of 20 m/s and other half with a speed of 30 m/s in equal intervals of time is _________.
1. 25 m/s2. 0 m/s3. 24 m/s
4. 2.4 m/s
Answer: 1Question 21Question: Displacement is a ________ quantity.
1. scalar2. vector3. derived4. linear
Answer: 2Question 22Question: km / h2 is a unit of ________ .
1. velocity2. speed3. acceleration4. distance
Answer: 3Question 23Question: The speed-time graph for a particle moving at constant speed is a straight-line ________ to the time axis.
1. parallel2. perpendicular3. aligned4. inclined
Answer: 1Question 24Question: When an object moves in a fixed direction with uniform acceleration, the speed-time graph is a ________.
1. parabola2. straight line3. ellipse4. curve
Answer: 2Question 25Question: The area under the speed-time graph gives the ________.
1. distance2. velocity3. time4. acceleration
Answer: 1Question 26Question: A speed of 90 km/h, expressed in cm s-1 is ________.
1. 2.5
2. 25003. 3004. 90
Answer: 2Question 27Question: When an object of mass 5 kg starts from rest, what is its initial velocity?
1. 02. - 5 m/s
3.variable5
4. 1 m/s
Answer: 1Question 28Question: Identify the v- t graph representing uniform velocity.
1.
2.
3.
4.
Answer: 2Question 29Question: Name the physical quantity that is defined as the rate of change of displacement.
1. velocity2. acceleration3. distance4. speed
Answer: 1Question 30Question: An object moves with a constant velocity of 9.8 m/s, its acceleration in m s-2 is ________.
1. 9.8 m/s2
2. zero3. 0.98 m/s4. 98 m/s2
Answer: 2Question 31Question: In 12 minutes a car whose speed is 35 km/h travels a distance of
1. 7 km2. 3.5 km3. 14 km4. 28 km
Answer: 1Question 32Question: A body moving along a straight line at 20 m/s undergoes an acceleration of 4 m/s2. After two seconds its speed will be ________.
1. 8 m/s2. 12 m/s3. 16 m/s4. 28 m/s
Answer: 4Question 33Question: A car increases its speed from 20 km/h to 50 km/h in 10 seconds. Its acceleration is ________.
1. 30 m/s2
2. 3 m/s2
3. 18 m/s2
4. 0.83 m/s2
Answer: 4Question 34Question: When the distance covered by an object is directly proportional to time, it is said to travel with ________.
1. zero velocity2. constant speed3. constant acceleration4. uniform acceleration
Answer: 2Question 35Question: Negative acceleration means an object is moving with ________ .
Answer: 1Question 37Question: Distance-time graph is a straight line for __________ motion.
1. variable2. non uniform3. rectilinear4. circular
Answer: 3Question 38Question: A car is moving with a speed of 36 km/h. Its speed in m/s is _______.
1. 102. 1003. 24. 1
Answer: 1Question 39Question: A car starts from rest and covers a distance of 100 m in one second with uniform acceleration. Its acceleration is _________.
1. 100 m/s2
2. 50 m/s2
3. 200 m/s2
4. 100 m/s
Answer: 1Question 40Question: Which of the following is a vector quantity?
1. area2. length3. distance4. displacement
Answer: 4Question 41Question: The slope of a v-t graph gives ________.
1. acceleration2. velocity3. speed4. distance
Answer: 3Question 42Question: The physical quantity describing motion and whose measure is the product of distance travelled and the time taken to travel that distance is ________.
1. speed2. mass3. weight4. displacement
Answer: 1Question 43Question: If you are travelling with a velocity of 25 m/s, how long will you take to travel 700 m?
1. 25 s2. 28 s3. 25 min4. 2.8 s
Answer: 2Question 44Question: Name the instrument used to measure instantaneous speed of a vehicle.
Question: A body covers a distance S in time t. What is its speed?
1. S/t2. t/S3. S x t4. Zero
Answer: 1Matter In Our Surroundings - Multiple Choice Test
Question 1Question: Matter has ___________.
1. no mass but occupies space
2. mass but occupies no space
3. mass and occupies space
4. no mass and occupies no space
Answer: 3Question 2Question: The gaseous form of water is called as _______.
1. water gas
2. water vapour
3. fog
4. snow
Answer: 2Question 3Question: The state of matter with only one free surface is _______.
1. liquid
2. gas
3. solid
4. plasma
Answer: 1Question 4Question: In gases, particles vibrate _________.
1. about their mean position
2. about a vertical axis
3. about a horizontal axis
4. in any direction
Answer: 4Question 5Question: Mixing of gases is called ______.
1. diffusion
2. effusion
3. filtration
4. sedimentation
Answer: 1Question 6Question: A property not possessed by a fluid is _________.
1. it can flow
2. it has mass
3. it has a definite shape
4. can be perceived by our senses
Answer: 3Question 7Question: Which among the following is a solid at room temperature?
1. Nitrogen
2. Potassium permanganate
3. Bromine
4. Helium
Answer: 2Question 8Question: Which of these is a characteristic property of gases?
1. Gases are not at all rigid.
2. Gases are not compressible.
3. Gases have particles in fixed positions.
4. Gases have high density.
Answer: 1Question 9Question: A solid has _________.
1. maximum intermolecular space
2. definite mass but no definite volume
3. very high compressibility
4. maximum intermolecular force of attraction
Answer: 4Question 10Question: Conversion of gas to liquid is called _________.
1. condensation
2. sublimation
3. vapourisation
4. solidification
Answer: 1Question 11Question: The process by which wet clothes dry up is called _______.
1. evaporation
2. boiling
3. condensation
4. solidification
Answer: 1Question 12Question: A solid that sublimes on heating is _________.
1. sodium chloride
2. copper sulphate
3. lead sulphate
4. ammonium chloride
Answer: 4
Question 13Question: Matter changes from one state to another with change in _________.
1. density
2. temperature
3. volume
4. height
Answer: 2Question 14Question: The process of a solid changing into liquid is called ___________.
1. liquefaction
2. melting
3. freezing
4. solidification
Answer: 2Question 15Question: The freezing point of pure water is __________.
1. 100oC
2. 0oC
3. 5oC
4. 78.3oC
Answer: 2Question 16Question: The force between particles of matter is called as ___________.
1. cohesive force
2. adhesive force
3. kinetic energy
4. thermal energy
Answer: 1Question 17Question: Particles of matter are __________.
1. stationary
2. vibrating in one position
3. in continuous motion
4. rotating about an axis
Answer: 3Question 18Question: The temperature at which vapour changes into liquid is called ________.
1. freezing point
2. melting point
3. boiling point
4. liquefaction point
Answer: 4Question 19Question: Temperature is a measure of ___________.
1. total kinetic energy of molecules
2. total potential energy of molecules
3. average potential energy of molecules
4. average kinetic energy of molecules
Answer: 1Question 20Question: For any substance the temperature remains same during the change of state due to ___________.
1. loss of heat
2. latent heat
3. less supply of heat
4. lattice energy
Answer: 2Objective General Knowledge
Q In an atom no two electrons have all the four quantum numbers identical. This is
. known as
1 Paulis Exclusion principle
2 Hunds Rule
3 Aufbau Principle
4 Avogadros Law
Ans:1
Q.
Which of the following is a physical change?
1 Boiling of Water
2 Rusting of Iron
3 Boiling of an Egg
4 Burning of Candle
Ans:1
Q.
Superconductors are those materials
1 Which become non-conductors at transition point
2 Which looses all electrical resistance when cooled below a certain temperature
3 In which resistance rises to infinity below certain temperature
4 Which conducts electricity in extra widths
Ans:2
Q.
Which one of the following is not a radioactive element?
1 Uranium
2 Radium
3 Thorium
4 Cadmium
Ans:4
Q.
A body is thrown vertically upwards with a speed of 100 m/sec. While coming back on ground, its speed at starting point will be
1 100 m/sec
2 1000 m/sec
3 50 m/sec
4 200 m/sec
Ans:1
Q.
When 1 litre of water freezes, the volume of ice formed will be
1 0.9 litre
2 1.0 litre
3 1.11 litre
4 1.5 litre
Ans:3
Q.
An object is placed between the pole of concave mirror and the focus of the mirror, the image formed will be
1 Behind the mirror, virtual, erect and magnified
2 At infinity, real inverted and highly enlarged
3 Byond centre of curvature, real inverted and enlarged
4 Beyond 2F, real inverted and enlarged
Ans:1
Q.
A hollow cylindrical rod is filled with air, to make it a resonance column. To produce a wave of length 48 cm the minimum length of rod should be
1 12 cm
2 24 cm
3 48 cm
4 96 cm
Ans:2
Q.
In a telescope of magnification power 10, the focal length of the objective lens is 60 cm, what will be the total length of eyepiece
1 6 cm
2 25 cm
3 30 cm
4 50 cm
Ans:1
Q.
A boy has five resistance of 1/5 ohm each. The maximum resistance that can be formed with them is
1 0.5 ohm
2 1 ohm
3 1/25 ohm
4 1/5 ohm
Ans:2
Q.
Each of 3 capacitors of capacity C are connected together in series. This combination is added in paralled to a capacitor of capacity C. Resultant capacity will be
1 C
2 3C
3 4C
4 4C/3
Ans:4
Q.
A falling drop of rain water acquires the spherical shape due to
1 Surface Tension
2 Gravitational force
3 Atmospheric pressure
4 Viscosity
Ans:1
Q.
A periscope works by the principle of
1 Refraction
2 Total Internal reflection
3 Diffraction
4 Reflection and refraction
Ans:2
Q.
Which of the following light waves is outside the visible spectrum?
1 Violet
2 Blue
3 Yellow
4 Ultraviolet
Ans:4
Q.
Estimated time period of a pendulum of length 0.2m is closer to is
1 .5 sec
2 1 sec
3 2 sec
4 None of these
Ans:2
Q.
What is the value of knee voltage of silicon diode?
1 0.3V
2 0.33V
3 0.7V
4 1.1V
Ans:3
Q There is 20 volt accross the inductor and 15 volt across the resistance in the a.c.
. supplied series R-L circuit. What would be the supply voltage?
1 20 volt
2 15 volt
3 25 volt
4 17.5 volt
Ans:3
Q.
A transformer mainly transforms -
1 Current
2 Voltage
3 Frequency
4 Power
Ans:2
Q.
What is the power factor of a pure resistor circuit?
1 One
2 Zero
3 Leading
4 Lagging
Ans:1
Q.
What is the S. I. unit of magnetic flux density?
1 Gauss
2 Tesla
3 Oersted
4 Weber
Ans:2
Q.Which type of oscillator is most stable in simple circuit?