KARPAGAM ACADEMY OF HIGHER …...42. The unit of thermal capacity mcq c = 1/m (dq/dt) mc calories/C none of the above mc calories/C 43. One therm is in 10 5 pounds quantity of water

1

KARPAGAM ACADEMY OF HIGHER EDUCATION,COIMBATORE-21

DEPARTMENT OF PHYSICS

CLASS: I B. Sc. PHYSICS BATCH: 2015 - 2018

HEAT AND THERMODYNAMICS (15PHU201)

MULIPLE CHOICE QUESTIONS

QUESTIONS OPTION 1 OPTION 2 OPTION 3 OPTION 4 ANSWER

Unit - I

1. Heat can be defined

as_________________. energy conduction

energy

convection energy transition all of the above energy transition

2. The first thermometer was

constructed by_____________. Galileo Newton Kelvin Celsius Galileo

3. The specific heat (C) is defined

by_____________________. H/mq H/m H/q H*mq H/mq

4. Unit of specific heat is

_______________. calorie/g*°C g*°C/calorie calorie/g calories calorie/g*°C

5. The quantity of heat required to raise the temperature of the

whole of the substance through

1 °C is defined by Specific heat

Thermal

Capacity Water equivalent thermal equilibrium Thermal Capacity

6. A calorimeter is mainly used to

measure the

_________________________. heat temperature pressure volume heat

7. The specific heat of silver is

_______________ than gold. higher lower equal none of the above higher

8. Newton’s law of cooling states

that the rate of loss of heat of a

body is _______________ to

the difference of temperature of

the body and the surroundings. equal directly inversely none of the above directly

9. Newton’s law of cooling can be

obtained experimentally by the graph plotted

between________. time vs. temperature

temperature vs.

time temperature vs. velocity none of the above temperature vs. time

10. The quantity of heat required to

raise the temperature of one

gram of a gas through at 1 ° C Cp CH Cv zero Cv

2

is equal at constant volume is

equal to_________________.

11. The value of the universal gas

constant R for one gram

molecule of a gas is equal to

__________. 7.54 x 107 8.31 x 107 4.31 x 107 zero 8.31 x 107

12. Specific heat of a gas at

constant pressure is determined

by_________.

Joly’s differential

steam calorimeter

Regnault’s

method Joule’s calorie meter

Callendar and

Barnes’ method Regnault’s method

13. The specific heats both Cp and Cv of hydrogen (for 1 gram) are 3.435 and 2.44 2.44 and 3.435 1 and 0 none of the above 3.435 and 2.44

14. As per Dulong and Petit’s Law, the exact value of atomic heat

of the substance is equal to

_________. 5.26 5.96 5 zero 5.96

15. The atomic heat of lead is

_______________ than carbon

at 20 °C. higher lower equal none of the above higher

16. The atomic heat of silver at 20

K is _______________. 0 0.4 0.2 4.8 0.4

17. Einstein’s theory of specific

heat

accepts different

frequencies of

molecular vibrations

accepts same

frequencies of

molecular

vibrations

reflects molecular

vibrations none of the above

accepts different

frequencies of

molecular vibrations

18. At high temperature, the static

heat of a solid attains a value infinite 5/2 R 3R 1/2R 3R

19. At low temperature, the static heat of a solid attains a value 0 infinite 5R 3R 0

20. According to Debye's theory,

the atomic heat of a solid at low

temperature varies as

proportional to its

absolute temperature

proportional to

square of its

absolute

temperature

proportional to cube of

its absolute temperature

independent of

temperature

proportional to cube

of its absolute

temperature

21. Einstein’s theory of specific

heat of solids assumes that the

atoms of a solid vibrate simple

harmonics

like longitudinal

waves

like transverse

waves

all with the same

frequency in a complex manner

all with the same

frequency

22. According to Dulong's and

Petit's law, the average energy

of an atom of a solid at

temperature T is 1/2 KT KT 2 KT 3 KT 3 KT

3

23. According to Dulong's and

Petit's law, the atomic heat of

an element of constant volume

increase with increase

of temperature

decrease with

increase of

temperature

become zero at absolute

zero is constant is constant

24. The degeneracy parameter ea

satisfies this condition, the gas

is said to be weakly degenerate

strongly

degenerate non degenerate none of the above non degenerate

25. RMS speed of an ideal gas is

inversely proportional to the

square root of its mass temperature none of these both of these mass

26. The RMS speed of gas at 400 K is

twice the value at 100 K

four times the value at 100 K half the value at 100 K same as at 100 K

twice the value at 100 K

27. Which of the following

variables controls the physical

properties of a perfect gas pressure temperature volume all of the above all of the above

28. Which of the following laws is

applicable for the behavior of a

perfect gas Boyle's law Charles' law Gay-Lussac law all of the above all of the above

29. The unit of time in SI unit is second hour day minute second

30. The unit of energy in SI unit is watt joule joule/s joule/m joule

31. An ideal gas as compared to a real gas at very high pressure

occupies more volume less volume same volume

unpredictable

behaviour more volume

32. General gas equation is PV = nRT PV = mRT PV = c PV = KiRt PV = mRT

33. Which of the following can be regarded as gas so that gas law

could be applicable within the

commonly encountered

temperature limits. O2, N2, steam, CO2

O2, N2, water

vapour

SO2, NH3, CO2,

moisture O2, N2, H2, air O2, N2, H2, air

34. The unit of pressure in SI units

is Kg/cm2

mm of water

column Pascal dynes per square cm Pascal

35. Temperature of a gas is

produced due to Its heating value

kinetic energy of

molecules repulsion of molecules

attraction of

molecules

kinetic energy of

molecules

36. Kinetic theory of gases assumes

that the collisions between the

molecules are perfectly elastic

perfectly

inelastic partly elastic partly inelastic perfectly elastic

37. Calorie is the quantity of heat

required to raise the

temperature of one gram of

water from 14.5 C to 15.5 C Energy Power Calorie volume calorie

4

38. The specific heat of a gas at

constant pressure by electrical

method can be determined by

Callender and Barnes method Boyle's method

Callender and

Barnes method Joule's method Graham’s method

Callender and Barnes

method

39. Specific heat is defined as

quantity of heat required to

raise temperature of unit mass

of a substance through one degree Specific heat calorie pound calorie thermal capacity Specific heat

40. One calorie is equal to raise in 1

C and quantity of water calorie BTU thermal volume calorie

41. Pound calorie is in 1 pound

quantity of water and its rise in

1 C temperature the value is

equal to 1000 calories 453.6 calories 252 0 453.6 calories

42. The unit of thermal capacity mcq c = 1/m (dq/dt) mc calories/C none of the above mc calories/C

43. One therm is in 10 5 pounds

quantity of water and raise in 1

C temperature the value is equal 252 calories

2.52 x 10 7

calories 1000 calories 252 calories 2.52 x 10 7 calories

44. The atomic heat for aluminium

is greater than boron less than equal to greater than all of the above greater than

45. The atomic heat value of copper

is 5.79 5.72 1.92 6.11 5.79 5.79

46. The value of R is the same for

all gases provided the mass of

the gas is zero 100 gram 50 gram one gram one gram

47. One watt is equal to 1 Nm/S 1 N/mt 1 Nm/hr 1 KNm/mt 1 Nm/S

48. Work done is the zero for the

following process constant volume free equation all of the above none of the above all of the above

49. On volume basis, air contains

following parts of oxygen 21 23 25 77 21

50. In a free expansion process work done is zero

heat transfer is

zero both a and b above

work done is zero but

heat increases both a and b above

51. The specific heat of air

increases with increase in temperature pressure

both pressure and

temperature air flow temperature

52. Which of the process is

irreversible process isothermal adiabatic throttling all of the above throtting

53. For reversible adiabatic process change in entropy is maximum minimum zero negative zero

5

54. The unit of temperature in SI

units is Centigrade Celsius Fahrenheit Kelvin Kelvin

55. The unit of mass in SI units is Kilogram gram tonne quintal quintal

56. The pressure of a gas in terms

of its mean kinetic energy per

unit volume E is equal to t/3 t/2 3E/4 2E/4 2E/4

57. The unit of power in SI units is Newton Pascal erg watt watt

58. The ratio of two specific heats

of air is equal to 0.17 0.24 0.1 1.4 1.4

59. Which law states that the

internal energy of a gas is a

function of temperature Charle's law Joule's law Regnault's law Boyle's law Joule's law

60. Which law states that the

specific heat of a gas remains

constant at all temperature and

pressure Charle's law Joule's law Regnault's law Boyle's law Regnault's law

61. Gases have

Only one value of

specific heat

two values of

specific heat

three values of specific

heat no values

two values of specific

heat

62. Work done in a free expansion

process is Positive Negative zero maximum zero

63. Internal energy of a perfect gas depends upon temperature only

temperature and pressure

temperature, pressure and specific heats none of the above. temperature only


temperature scales doesn’t have

negative numbers? Celsius Kelvin Reaumur Fahrenheit Kelvin

65. Which of two temperature

change are equivalent? 1 K = 1 F 1 F = 1 C 1 Re = 1 F 1 K = 1 C 1 K = 1 C

66. What temperature change on

the Kelvin scale is equivalent to

a 10 degree change on the

Celsius scale 283 K 273 K 18 K 10 K 10 K

67. A combustion process produces

a gas stream with the mass

fractions 14% CO2, 8% H2O,

5% O2, and 73% N2. What is

the cp of the mixture at 1000 K? 1.262 kJ/kgK 1.234 kJ/kgK 1.167 kJ/kg 1.234 J/kgK 1.262 kJ/kgK

68. Control volume refers to a specified mass

fixed region in

the space closed system none of the above

fixed region in the

space

6

Unit - II 1. Conduction is the process in

which heat is transmitted from

one point to the other through

the

substance__________________

.

with actual movement

of particles.

without actual

movement of

particles without any medium none of the above

without actual

movement of particles

2. Thermal diffusivity is defined

as ___________

the ratio of thermal

conductivity to

thermal capacity per

unit volume.

directly

proportional to

the thermal

conductivity

inversely proportional to

thermal conductivity none of the above


conductivity to


unit volume.

3. The coefficient of thermal

conductivity of a rubber can be

determined by the principle of

______.

Rectilinear of flow of

heat

Cylindrical flow

of heat radial flow of heat none of the above

Cylindrical flow of

heat

4. The relation between thermal conductivity and electrical

conductivity is defined as

__________.

Wiedemann-Franz

law Wiedemann law Hookes law none of the above

Wiedemann-Franz

law

5. The pressure of a gas in terms

of its mean kinetic energy per

unit volume E is equal to E/3 E/2 3E/4 2E/3 2E/3

6. Kinetic energy of the molecules

in terms of absolute temperature

T is proportional to


conductivity to


unit volume. T J J2 T

7. Superheated vapour behaves exactly as gas as steam as ordinary vapour

approximately as a

gas

approximately as a

gas

8. No liquids can exist as liquid at 273 K vacuum zero pressure centre of earth zero pressure

9. The unit of power in SI units is Newton Pascal erg Watt Watt

10. The condition of perfect

vacuum, i.e. absolute zero

pressure can be attained

a temperature of -

273.16 C

a temperature of

0 C a temperature of 273 C cannot be attained

a temperature of -

273.16 C

11. Intensive property of a system

is one whose value

depends on the mass

of the system like

volume

does not depend

on the mass of

the system like

temperature,

pressure etc.

is not dependent on the

path followed but on the

state

is dependent on the

path followed and not

on the state

does not depend on

the mass of the

system like

temperature, pressure

etc.

7

12. Specific heat of air at constant

pressure equal to 0.17 0.21 0.24 1 0.24

13. Which of the following does

not help to transfer heat? conduction convection dispersion radiation dispersion

14. All the following items are

good conductors of heat except A copper saucepan

A stainless steel

spoon a wooden table met an aluminium teapot a wooden table met

15. Which of the following is the

poorest conductor of heat? a gas a liquid a solid a vacuum a vacuum

16. Which one of these devices can

work without the help of

convection? Air - conditioner Electric kettle Electric mixer Hot water heater Electric mixer

17. Convection is a process of heat

transfer that depends on

density differences in

a liquid or a gas

heavy molecules falling and light

ones rising

molecules vibrating and

then keeping still

radiation of energy

between two places

density differences in

a liquid or a gas

18. Which surface is the best

radiator of heat rough, dull and black

rough dull and

white smooth, shiny and black

smooth, white and

silvery rough, dull and black

19. On a cloudiness night, the earth

is gold because its heat is conducted convected radiated transported radiated

20. The dimensional formula of K

is M1L1T-3K-1 M1L1T3K-1 M1L1T2K-1 M1L1T-2K1 M1L1T-3K-1

21. Thermal capacity of a good

conductor is determined by

Lee's method or

Searle's apparatus

Forbe's method

or Lee's method

Searle's apparatus or

Forbe's method none of the above

Searle's apparatus or

Forbe's method

22. Thermal conductivity of a bad

conductor is determined by Forbe's method Lee's method Searle's apparatus none of the above Lee's method

23. The SI unit of thermal

conductivity is JSm-1C-1 JS-1m-1C-1 JS-1m-1C JS-1mC-1 JS-1m-1C-1

24. Thermal conductivity of bad

conductors is measured by Searle’s method

Lee's disc

method

Callender and Barnes

method none of the above Lee's disc method

25. Therefore the coefficient of

thermal conductivity is defined

as the amount of heat flowing in one second across the

opposite faces of a cube of side

on cm maintained at a

difference of temperature 3 C 1 C 2 C 0 C 1 C

26. Two rods of length L and 2 L,

thermal conductivities 2 K and

K of same cross sectional area

are connected end to end, then

the equivalent thermal (5/6) K 1.5 K 1.2 K (8/9) K 1.2 K

8

conductivity of the system

27. The value of Stefan's constant is

5.996 x 10-8 w m-2 k-

1

4.3219 x 10-8 w

m-2 k-1 5.6696 x 10 8 w m-2 k-1

5.6696 x 10 7 w m-2

k-1

5.996 x 10-8 w m-2

k-1

28. The earth, thus, subjected to a

periodic propagated into the

interior of the earth. This wave

is called the------------ annual wave directional wave wave none of the above directional wave

29. For convection

method________________

type of crystal used. KMnO4

large crystal of

KMnO4 crystal none of the above

large crystal of

KMnO4

30. _____________ is used in

research in for the study in

infrared radiations thermopile linear thermopile thermocouple none of the above linear thermopile

31. The thermal conductivity of metal is different at

____________ temperature. same different both none of the above same

32. Lee's method for bad

conductors a steady current

passed through heater coil thermo couples thin disk copper plates heater coil

33. Searle's method determined by conductivity

thermal

conductivity

co-efficient of thermal

conductivity temperature

co-efficient of

thermal conductivity

34. Gas constant R0 = 1.3802 x 10 -3 J K-1

8.3143 x 10 3

JK-1 Kmol-1 3.7418 x 10-16 Wm2

5.669 x 10 -8 Wm-2

K-1

8.3143 x 10 3 JK-1

Kmol-1

35. Thermal conductivity

measurement is also called as Ingen-Hausz method Flow method Angstrom's method Searle’s method Angstrom's method

36. The velocity of heat wave n = Ö 4πh Ö 2ωh Öωh none of the above Ö 2ωh

37. Formula for cylindrical flow of

heat method Q = - KA dq/dr Q = - KA Q = - dq/dr KA = Q dq/dr Q = - KA dq/dr

38. The thermopile originally

designed by __________

consisted of a number of

thermo couples joined in series. Stefan’s Melloni Newton Hook Melloni

39. Heat radiations travel in curve wave straight line parallel line straight line

40. Heat produced per second ELM/4.2 calories EI/4.2 calories 4.2 calories 5.89/EI calories EI/4.2 calories

41. The co-efficient of thermal

conductivity of a rubber tubing

can be determined in the

laboratory applying the

principle of

continuous flow

method

cylindrical flow

of heat spherical all method none of the above

cylindrical flow of

heat

9

42. According to Avogadro’s

hypothesis

the molecular weights

of all the perfect gases

occupy the same

volume under same

conditions of pressure

and temperature

the sum of partial

pressure of

mixture of two

gases in sum of

the two

product of the gas

constant and the

molecular weight of the

ideal gas is constant

gases have two

values of specific

heat

the sum of partial

pressure of mixture of

two gases in sum of

the two

43. Gases have

only one value of

specific heat

two values of

specific heat

three values of specific

heat

no value of specific

heat

only one value of

specific heat

44. Extension property of a system

is one whose value

depends on the mass

of the system like

volume

does not depend on the mass of

the system like

temperature,

pressure etc.

is dependent on the path

followed but on the state is also constant

depends on the mass

of the system like

volume


process is positive negative zero maximum maximum

46. The statement that molecular

weights of all gases occupy the

same volume is known as Avogadro's hypothesis Dalton's law Gas law Joule's law

Avogadro's

hypothesis

47. If a gas is heated against a

pressure keeping the volume

constant, then work done will

be equal to positive negative zero pressure x volume zero

48. Thermal conduction in metals

take place by free electrons bound electrons vibrations of molecules none of the above free electrons

49. If c is the length and A area of cross section of a rod and k is

thermal conductivity of

materials then the thermal

resistance is given by KL/A A/KL KA/L L/KA L/KA

50. In the Ingen-Hausz experiment

the thermal conductivity K and

length L of the rod up to which

wax melts are related as K/L = constant K2/L = constant K/L2 = constant KL = constant KL = constant

51. Under steady state, the

temperature of body increases with time

decreases with

time

does not change with

time and is same at all

points of the body


time and can be

different at different

points of the body


time and can be

different at different

points of the body

52. The rate of flow of heat through

a metal bar of area of cross

section 1 m2 when temperature thermal resistance

thermal

conductivity diffusivity resistivity thermal conductivity

10

gradient is 1 C/m under steady

state is called

53. A single plate of double

thickness is made by joining

two equal plates of thermal

conductivities K1 and K2, the

equivalent thermal conductivity

of the composite plate will be 2K1K2/K1+K2 K1K2/K1+K2 K1/K1+K2 K2/K1+K2 2K1K2/K1+K2

54. In Searle's method for finding conductivity of metal, the

temperature gradient along the

bar

is greater near the hot

end

is greater near

the cold end

is same at all points

along the bar

increases as we go

from hot to cold end

is same at all points

along the bar

55. Properties of substances like

pressure temperature and

density in thermodynamics is

co-ordinates are path function point function cyclic function real function point function

56. Mixture of ice and water form a closed system open system isolated system heterogeneous system heterogeneous system

57. Which of the following is not

intensive property pressure heat specific volume density heat

58. If a certain amount of dry ice is

mixed with same amount of

water at 80 C, the final

temperature of mixture will be 80 C 0 C 40 C 110 C 0 C

59. When we touch a piece of metal

and a piece of wood that are

placed in the same room, the

piece of metal feels much

colder than the piece of wood. This happens because of the

difference in: Specific heat Temperature Density Thermal conductivity Thermal conductivity

60. Which of the following could

NOT be used to indicate a

temperature change? A change

in: color of a metal rod

length of a liquid

column

pressure of a gas at

constant volume electrical resistance

mass of one mole of

gas at constant

pressure

61. An open system is one in which

mass does not cross

boundaries of the

system, though energy

may do so

neither mass nor

energy crosses

the boundaries of

the system

both energy and mass

cross the boundaries of

the system

mass crosses the

boundary but not the

energy

both energy and mass

cross the boundaries

of the system

62. A closed system is one, which

Permits the passage of

energy and matter

Does not permit

the passage of


energy across the

Permits the passage

of matter across the


energy across the

11

across the boundaries energy and

matter across the

boundaries

boundary but does not

permit the passage of

matter

boundary but does

not permit the

passage of energy

boundary but does not

permit the passage of

matter

63. The process of heat transfer by

the movement of mass from one

place to another is called: Convection Conduction Radiation Induction Convection

64. Which mechanism of heat

transfer is involved in heat flow

from Sun to Earth? Convection Conduction Radiation Induction Radiation

65. If the absolute temperature of a radiating objects is doubled, by

what factor does the rate of

energy emission change? 2 4 8 16 16

Unit - III

1. When the pressure of a constant

mass of gas is not too great say

less than about 2 atm 5 atm 3 atm 1 atm 1 atm

2. Which of the following variables control the physical

properties of a perfect gas pressure volume all the above atomic gas atomic gas

3. The unit of temperature in SI

unit is centigrade Kelvin Fahrenheit Rankine Rankine

4. Work which of the following

substances the gas lower can be

used with minimum error dry stream cool stream free expansion superheated stream superheated stream

5. The stream NTP states for

temperature and

pressure

natural

temperature and

pressure

normal thermodynamic

pressure none of the above

normal

thermodynamic

pressure

6. A heat exchange process in

which the product pressure and

volume constant is known as heat exchange process

isentropic

process adiabatic process hyperbolic process hyperbolic process

7. Zero law of thermodynamics deals with conversion of mass and energy

deals with

reversibility and

irreversibility process

states that systems are both in equilibrium does not exist

states that systems are both in equilibrium

8. If a certain amount of dry is

mixed with some amount water

of 80 C final temperature 80 C 0 C 40 C 60 C 0 C

12

9. Work done is zero for the

following process constant volume free expansion all the above none of the above all the above

10. One watt is equal to 1 Nm/s 1 N/mt 1 K/nm 0 1 Nm/s

11. The molecules of an ideal gas

have only kinetic energy

only potential

energy both KE and PE none of the above only kinetic energy

12. The value of Boltzmann's

constant is 1.38 x 10 -16 J K-1 1.38 J K-1 1.38 x 10 -23 J K-1 8.314 1.38 x 10 -23 J K-1

13. According to kinetic theory of

gases the relation between

pressure P density r and mean

square velocity is P = 1/2 P C2 P = 1/3 P C2 P = 1/2 P C P = 1/3 P C P = 1/3 P C2

14. The temperature of a gas is

doubled, then its root mean

square speed becomes double Ö2 times half 1/Ö2 times Ö2 times

15. The average velocity of the molecules in a gas in

equilibrium is proportional to ÖT

proportional to

T2 proportional to T equal to zero equal to zero

16. The average energy of

molecules of monatomic gas at

temperature T is 1/2 KT 3/2 KT KT 5/2 KT 3/2 KT

17. A diatomic gas molecule has

translational, rotational and

vibrational degree's of freedom,

the ratio of Cp/Cv is 1.67 1.4 1 2 1.4

18. The kinetic energy per unit

volume of a perfect gas is equal

to 2/3 P 3/2 P P/3 1/2 P 3/2 P

19. For a gas the rms speed at 800

K is

four times the value of

200 K

twice the value

of 200 K half the value of 200 K same as at 200 K

twice the value of 200

K

20. Which turns out to be just 1/T,

where T is previously defined '

thermodynamic temperature' normally measured in Newton Kelvin Calorie meter Kelvin

21. Typical speeds in excess of

__________ at room

temperature 350 m/s 200 m/s 300 m/s 100 m/s 200 m/s

22. The gas particles are typically

separated by distances which

are much _________ than the smaller bigger strongly larger larger

13

particles size

23. Equipartition theorem or the

equipartition of energy called

the Boltzmann’s constant kinetic theory molecular theory

molecules kinetic

theory kinetic theory

24. Molecules has an associated

mean energy of 1/2 KB T where

KB= 380.650 x 10 -23 J/K

383.650 x 10 -23

J/K 383.650 x 10 23 J/K 380.650 x 10 23 J/K 380.650 x 10 -23 J/K

25. Boltzmann’s constant is related

to our old friend the molar gas

constant R 8.31 J/mol.K 8.41 J/mol.K 8.314 J/mol.K 8.143 J/mol.K 8.314 J/mol.K

26. Every molecular or atomic

degree of freedom, there is an

average_______ of associated energy 3/2 KB 1/2 KB 1 KB 5/2 KB 1/2 KB

27. A mass of gas occupies a

volume of 8 liters at a pressure

of 1 atm and a temperature of 258 abs 300 abs 200 abs 100 abs 300 abs

28. Determine the final pressure

and the final temperature,

assuming it to be an ideal gas

whose value of r = 1.5 0.5 0.05 1.05 1.5

29. 5 gm air is heated from 273 K

to 275 K. The change in

internal energy of air will be 7.22 J 5.22 J 8.16 J 3.5 J 7.22 J

30. Moon has no atmosphere

because

it is far away from the

surface of the earth

its surface

temperature is 10

C

the rms velocity of all the

gas molecular is more

than the escape velocity

of the moon’s surface

the escape velocity of

the moon’s surface is

more than the rms

velocity all molecules

the rms velocity of all

the gas molecular is

more than the escape

velocity of the

moon’s surface

31. An ideal gas exerts a pressure P. The mean kinetic energy per

unit volume is E which of the

following relation is correct P =E P = E/2 P =2/3 E P = 3/2 P P =2/3 E


gases at absolute 0 C

temperature Water freeze

liquid helium

freeze molecules motion stops

liquid hydrogen

freeze

molecules motion

stops

33. If 1 kg of water at its normal

boiling point forms 1.671 m3 of

steam the external latent heat of

vaporization of water is about 400 k cal/kg 40 k cal/g 4 k cal/kg 40 cal/kg 40 k cal/g

14

34. One mole of an ideal gas

requires 207 J to heat to raise

the temperature by 10 K when

heated at constant pressure. If

the same gas is heated at

constant volume to raise the

temperature by 10 K, then heat required is 96.6 J 124 J 198.8 J 215. 43 K 124 J

35. For an ideal gas, Cv/Cp is > 1 < 1 1 1 < 1

36. If P is the exerted by a gas and

E is the K.E per unit volume,

then P = E/3 P = (2/3) E P = 3/2 E P = 2/3 E P = (2/3) E

37. Boyle's law is applicable in isochoric process

isothermal

process isobaric process isotonic process isothermal process

38. If the pressure of an ideal gas is

decreased by 10 %

isothermally, then its volume

will increase by 10 %

increase by 11.1

% decrease by 10 % decrease by 9 % increase by 11.1 %

39. The lower calorific value of

fuel may be obtained by adding

the heat of stream formed

during combustion to the higher

calorie value yes no none of these all of the above no

40. One kg of carbon monoxide

requires 4/7 Kg of oxygen and

produces

11/3 kg of carbon

dioxide gas

7/3 kg carbon

monoxide gas

11/7 kg of carbon

monoxide gas none of the above

11/7 kg of carbon

monoxide gas

41. In a free expansion process w1-2 = 0 Q1-2=0 du = 0 all of the above all of the above

42. The heat focus from a cold

body on a hot body with the aid

of an external source. This

statement is given by Kelvin Joule Celsius none of the above Celsius

43. The gas in cooling chamber of a closed cycle gas turbine is

cooled at constant volume

constant

temperature constant pressure none of the above constant pressure

44. The isothermal and adiabatic

process are regarded as reversible process

irreversible

process

either reversible or non-

reversible none of the above reversible process

45. The heating of gas at constant

volume is governed by Boyle's law Charle's law Gay-Lussac's law Avogadro's law Gay-Lussac’s law

46. The ratio of specific heat at equal less than greater than none of the above less than

15

constant pressure Cp and

specific heat at constant volume

is always

47. The fuel mostly used in cement

industry and in metallurgical

process is wood charcoal bituminous cake pulverized coal cake pulverized coal

48. The molecules mass expressed

in gram of all gases at NTP

occupies a volume of 0.224 liters 2.24 liters 22.4 liters 224 liters 22.4 liters

49. Out of the following, the physical quantity that relates

with first law of

thermodynamics is temperature pressure energy number of moles energy

50. In producing cooling by

adiabatic demagnetization, we

use magnetic substance

paramagnetic

substance diamagnetic substance

ferromagnetic

substance

paramagnetic

substance

51. In Carnot cycle, the first step is isothermal expansion

isothermal

compression adiabatic expansion

adiabatic

compression isothermal expansion

52. The efficiency of Carnot engine

working between steam point

and ice point is 1 0 26.81% 0 26.81%


gases, at absolute zero

specific heat of

molecules reduces to

zero

kinetic energy of

molecules

reduces to zero

volume of gas reduce to

zero

pressure of gas

reduces to zero.

kinetic energy of

molecules reduces to

zero

54. A heat engine:

converts heat input to

an equivalent amount

of work

converts work to

an equivalent

amount of heat

takes heat in, does work,

and loses energy heat

uses positive work

done on the system to transfer heat from a

low temperature

reservoir to a high

temperature reservoir

takes heat in, does

work, and loses

energy heat

55. The state of an ideal gas was

changed three times at three

different temperatures. The

diagram represents three

different isothermal curves.

Which of the following is true

about the temperature of the

gas? T1 > T2 > T3 T1 > T2 < T3 T1 < T2 < T3 T1 > T2 = T3 T1 < T2 < T3


changed three times in a way P1 > P2 > P3 P1 > P2 < P3 P1 < P2 < P3 P1 = P2 > P3 P1 > P2 > P3

16

that the pressure stays the same.

The graph represents three

isobaric lines. Which of the

following is true about the

pressure of the gas?

57. The temperature of an ideal gas increases from 2 C to 4 C

while the pressure stays the same. What happens to the

volume of the gas? It doubles It quadruples It is cut to one-half It is cut to one-fourth it slightly increases


changed three times in a way

that the volume stays the same.

The graph represents three

isobaric lines. Which of the

following is true about the

volume of the gas? V1 >V2 >V3 V1 > V2 < V3 V1 < V2 < V3 V1 = V2 > V3 V1 >V2 >V3

59. The absolute temperature of an

ideal diatomic gas is

quadrupled. What happens to

the average speed of molecules? Quadruples Doubles Triples

Increases by a factor

of 1.41 Doubles

60. The average molecular kinetic energy of a gas depends on: Pressure Volume Temperature Number of moles Temperature

61. The theoretical (Carnot)

efficiency of a heat engine

operating between 600C and

100C is 16.70% 20.00% 42.70% 57.30% 57.30%

62. Which of the following is

always true for an isothermal

process of an ideal gas?

The internal energy

does not change

No heat flows

into or out of the

system

The pressure does not

change

The volume does not

change

The internal energy

does not change

63. According to which law, all

perfect gases change in volume

by l/273th of their original

volume at 0°C for every 1°C

change in temperature when

pressure remains constant Joule's law Boyle's law Regnault's law Charles' law Charles' law

64. At room temperature, the rms

speed of the molecules of a certain diatomic gas is found to

be 1930 m/s. The gas is H2 F2 O2 Cl2 H2

17

65. Kinetic Theory is based on an

ideal gas model. The following

statements about the ideal gas

are true EXCEPT:

The average

molecular kinetic

energy is directly

proportional to the

absolute temperature

All molecules

move with the

same speed

All molecules make

elastic collisions with

each other and the walls

of the container

The attractive force

between the

molecules can be

ignored

All molecules move

with the same speed

66. An ideal gas with an internal energy U initially at C is

heated to 2 3 C What is the new internal energy in terms of

U? U 1/2U 1/4U 2U 2U

67. The change of the state of an

ideal gas is presented by the

diagram. What is the ration

between work done on the gas

during the process 2→3 and

work done on the gas during the

process 4→1? (2/1) (1/2) (4/1) (3/1) (3/1)

68. The state of an ideal gas is

changed isothermally from

position 1 to position 2 is

shown above. What is the change in the internal energy of

the gas during this process? ΔU = W ΔU = Q ΔU > ΔU = ΔU =

69. If two molecules in a gas

collide, then

total momentum is

always exchanged

velocities are

always

exchanged

both molecules always

speed up

total kinetic energy

always increases

total momentum is

always exchanged

Unit - IV

1. The ratio of root mean square

velocity to average velocity of gas molecules at a particular

temperature is 0.086 1.086 3.086 4.086 1.086

2. First law of thermodynamics

deals with conservation of heat

conservation of

momentum conservation of mass

conservation of

energy

conservation of

energy

3. In SI units, the value of

universal gas constant is 8.314 J/Kg mole/ K

83.14 J/Kg mole/

K 831.4 J/Kg mole/ K 8314 Kg mole/ K 8314 Kg mole/ K

4. The throttling process is reversible irreversible all of the above none of the above irreversible

5. All the commercial liquid fuels

are delivered from natural TRUE FALSE all of the above none of the above TRUE

18

petroleum

6. A cycle consisting of one

constant pressure, one constant

volume and two isentropic

process is known as Carnot cycle sterling cycle Otto cycle diesel cycle diesel cycle

7. The efficiency and work ratio

of a simple gas turbine cycle are low very low high very high very low

8. There is a loss of heat in an

irreversible process TRUE FALSE all of the above none of the above TRUE

9. Water gas is obtained by

passing air and a large correct incorrect all of the above none of the above incorrect


process is zero minimum maximum position zero


statement is correct

the heat and work

done are boundary

phenomena

the heat and

work represent the energy

crossing the

boundary of

system

the heat and work done

are path function all of the above all of the above

12. The atomic of mass of an

element is the number of times

the atom of that element is

heavier than the hyrogenatome TRUE FALSE all of the above none of the above TRUE

13. In an ideal gas turbine plant it is

assumed that the compression

and expansion are isothermal isentropic polytropic none of the above isentropic

14. Zeroth law of thermodynamics

is

kinetic energy of

molecules of gas is

zero

ideal gas does

not contain

molecules

if two systems are

separated in thermal

equilibrium with a third

system then they themselves are in thermal

equilibrium with each

other none of the above

if two systems are

separated in thermal

equilibrium with a

third system then they themselves are in

thermal equilibrium

with each other

15. The ratio of adiabatic and

isothermal elasticities of a gas

is r r2 r-1 none of the above r

16. The physics underlying the

working of a refrigerator

closely resembles the physics

underlying ice formation heat engine

vapour compression

machine vaporization water heat engine

19

17. The efficiency of a Carnot

engine is 0.4. If the temperature

of sink is 27 C the temperature

of source is 127 C 500 C 500 K 400 K 500 K

18. Anything outside the

thermodynamics system which

can exchange energy with it and

has a direct bearing on the behaviour of the system is

called surroundings system Carnot engine surface surroundings

19. ________ which can exchange

matter and energy with the

surrounding closed system isolated system open system all of the above open system

20. ________ is called the equation

of state of the liquid f = (P, V) f (P, V) = T f (V, T) = P f (P, T) = V f (P, V) = T

21. First law of thermodynamics

equation_____________ Q = (V2-V1)+W Q = (V2+V1)-W Q = (V1-V2)+W Q = (V1+V2)-W Q = (V2-V1)+W

22. ________ types of equilibrium

as there in thermodynamics 1 2 3 4 3

23. In which year Clement and

Desormes discovered the

determination of g 1819 1981 1918 1891 1819

24. In Carnot’s engine the source insulates heat conducts heat conducts electricity insulates electricity conducts heat

25. A Carnot engine has the same

efficiency between 1000 K and

500 K and between x. k and

1000 K. calculate x =? 1000 K 3000 K 4000 K 2000 K 2000 K

26. An engine works between the

temperature 30 K and 300 K.

What is its efficiency? 50% 47% 90% 10% 90%

27. The atomic mass of sulfur is 12 14 16 32 32

28. The efficiency if a reversible

Carnot’s engine working

between temperature T1 and T2 is T2/T1 T1/T2 1-T2/T1 T1/T2-1 1-T2/T1

29. A diatomic gas at 18 C is

compressed adiabatically to

1/32 times of its original

volume. The temperature after 18 C 887 C 891 C 144 C 891 C

20

compression will be

30. A Carnot’s engine us operating

between 100 C and 50 C. Its

efficiency will be 13.40% 15.20% 50% 100% 13.40%

31. A reversible heat engine is 0.4.

If the temperature of the sink is

27 C, the temperature of source

is

less than that of

source

equal to that of

source 0 C 0 K 0 K

32. The door of running

refrigeration inside a room is

left open, Mark the correct

statement

the room will be

cooled slightly

the room will be

warmed

the room will be cooled

to the temperature inside

the refrigerator

the temperature of the

room will remain

unaffected

the temperature of the

room will remain

unaffected

33. In steady flow process, the ratio of

heat transfer is constant

work transfer is constant

mass flow at inlet and outlet is same all of the above all of the above

34. The entropy of the universe is

continuously of the increase correct incorrect all of the above none of the above correct

35. Select the correct statement as

per Charle's law

PV = constant if T is

kept constant

V/T = constant if

P is kept constant

P/T = constant if V is

kept constant

V/T = constant if P is

kept constant

V/T = constant if P is

kept constant

36. The unit of energy in SI unit is Joule Joule meter Watt Joule/Meter Joule

37. Diesel cycle consists of _________ process

two constant volume

and two isentropic

two constant

pressure and two

isentropic

two constant volume and

two isothermal

one constant pressure, one

constant volume and

two isentropic

one constant pressure,

one constant volume

and two isentropic

38. When coal is first dried and

crushed to a fine powder by

pulverizing machine, the

resulting fuel's called wood charcoal bituminous coal briquetted coal none of the above none of the above

39. The process is adiabatic, if the

value of n in the equation PVn =

C is 0 1 g a g

40. The heating of a gas at constant

volume is governed by Boyle's law Charle's law Gay-Lussac law Avogadro’s law Gay-Lussac law

41. The ratio of specific heat at

constant pressure and specific

heat at constant volume is always__________ one equal to less than greater than none of the above less than

42. The lower caloric value of fuel

may be obtained by adding the

heat of steam formed during yes no all of the above none of the above no

21

combustion to the higher

calorific value

43. An adiabatic process occurs at

constant temperature pressure heat none of the above heat

44. Internal energy of a real gas

depends upon only on the

temperature of the gas

only on the

volume of the

gas

only on the pressure of

the gas none of the above

only on the

temperature of the gas

45. Transfer of heat from a body at

low temperature to a body at

high temperature is impossible

is possible by

keeping both

bodies in contact

is possible by doing

some external work none of the above

is possible by doing

some external work

46. Law of conservation of energy is accordance with

Zeroth law of thermodynamics

first law of thermodynamics

second law of thermodynamics

third law of thermodynamics

first law of thermodynamics

47. When a gas undergoes

expansion or compression at

constant temperature, the

process is called isothermal process isochoric process isobaric process adiabatic process isothermal process

48. In a throttling process W = 0 E = 0 H = 0 all of the above. H = 0

49. Which of the following is not

an extensive property of a

thermo-dynamic system? Total mass

Total internal

energy Total volume Temperature Temperature

50. The measurement of

thermodynamics property

known as temperature, is based

on

Zeroth law of

thermodynamics

First law of

thermodynamics

Second law of

thermodynamics None of the above.

Zeroth law of

thermodynamics

51. A system consisting of more

than one phase is called isolated system open system non-uniform system

Heterogeneous

system.

Heterogeneous

system.

52. A system comprising of a single

phase, is known as open system closed system homogeneous system

Heterogeneous

system. homogeneous system

53. A heat engine that in each cycle

does positive work and loses

energy as heat, with no heat

energy input, would violate:

the Zeroth law of

thermodynamics

the first law of

thermodynamics

the second law of

thermodynamics

the third law of

thermodynamics

the first law of

thermodynamics

54. A Carnot cycle: is bounded by two

isotherms and two

adiabats on a p-V

graph

consists of two

isothermal and

two constant

volume processes

is any four sided process

on a p-V graph

only exists for an

ideal gas

is bounded by two

isotherms and two

adiabats on a p-V

graph

55. A Carnot engine operates

between 200°C and 20°C. Its

maximum possible efficiency 90% 100% 38% 72% 38%

22

is:

56. What is the name of the

following statement: “When

two systems are in thermal

equilibrium with a third system,

then they are in thermal

equilibrium with each other”?

First Law of

Thermodynamics

Second Law of

Thermodynamics

Mechanical equivalent of

heat

Zeroth Law of

Thermodynamics

Zeroth Law of

Thermodynamics

57. The process of heat transfer

from object to another because

of molecular motion and

interaction is called: Convection Conduction Radiation Induction Conduction

58. Which of the following parameters does not

characterize the

thermodynamics state of

matter? work volume pressure Temperature Work

59. Which of the following is not a

state variable? Work Internal energy Entropy Temperature Work

60. An aluminum plate has a

circular hole. If the temperature

of the plate increases, what

happens to the size of the hole? Increases Decreases Stays the same

Increases the top half

of the hole Increases

61. Boyle's law i.e. pV = constant is

applicable to gases under all ranges of pressures

only small range

of pressures high range of pressures

steady change of

pressures

only small range of

pressures

Unit - V

1. A catalyst speeds up a chemical

reaction by

changing the

stoichiometry

increase the

activation energy

providing an alternative

reaction mechanism of

lower activation energy

shifting the

equilibrium towards

the side of the

product

providing an

alternative reaction

mechanism of lower

activation energy

2. A solid has very high melting

point, is very hard, and its

liquid is non-conducting. The

compound is?

a molecular solid a metallic solid a covalent network solid an ionic solid a covalent network

solid

3. When one mole of ice melts to

liquid at 0 C

the entropy of a

system decreases

the entropy of a

system remains the same

the entropy of the system

increases

the order of system

increases

the entropy of the

system increases

4. The entropy of a chemical

system will usually increase

a molecule is broken

down in two or more

a liquid changes

into a gas

all of the above all of the above

23

when fragments

5. Arrange the common unit cells

of metals from the least dense

packing to the most dense

packing

BCC<FCC<SC FCC<BCC<SC FCC<SC<BCC SC<BCC<FCC SC<BCC<FCC

6. The normal boiling point of a

liquid is

the temperature at

which the entropy of

the liquid is equal to

zero

the temperature

above which the

substance cannot

exist as a liquid

regardless of the

pressure

the temperature at which

the vapour pressure of

the liquid equals the

ambient atmospheric

pressure

the temperature at

which the vapour

pressure of the liquid

equals to 1 atm

the temperature at

which the vapour

pressure of the liquid

equals to 1 atm

7. Which intermolecular forces are present in Phenol?

London dispersion only

dipole-dipole only

hydrogen-bonding only all of the above all of the above

8. Which of these is intensive

variable?

area temperature entropy volume temperature

9. In a reversible adiabatic

process, the change of entropy

increases decreases remains unchanged none of these remains unchanged

10. The change in entropy of a

mole of an ideal gas, when the

gas undergoes free expansion is

positive negative zero none of these positive

11. In a reversible process, the

entropy of the system

increases remains zero decreases remains constant remains constant

12. The unit of entropy Joule/Kelvin Calorie/Kelvin both a and b none of these both a and b

13. A piece of ice is added to water

in a cup, the energy

is increased decreased undergoes no change sometimes increases is increased

14. Net entropy change of a system

in Carnot's cycle

zero positive negative more than 1 zero


represents a reversible process?

ds<0 ds=0 ds>0 none of these ds=0

16. In the two gases at the same

molecule is equal

the internal energy is

equal

the entropy is

equal

pressure is equal the average kinetic

energy per molecule

is equal

the internal energy is

equal


represents a reversible process?

combustion diffusion melting neutralization melting

18. In which process the entropy

can increase

gas changes to liquid solid changes to

liquid

liquid changes to solid gas changes to solid solid changes to

liquid

19. In which process work is

maximum?

adiabatic irreversible cyclic reversible reversible

20. In the below process which can crystallization of melting of iron conversion of ice to vapourisation of crystallization of

24

represent the decrease in

entropy?

sucrose from solution water camphor sucrose from solution

21. In which process the change in

entropy gets the positive value

at constant pressure and

temperature? isobaric

reversible spontaneous non-spontaneous spontaneous

22. The absolute entropy of pure

substance at

295 K & 1 atm

pressure

298 K & 1 atm

pressure

295 K & 10 atm pressure 298K & 10 atm

pressure

298 K & 1 atm

pressure

23. Entropy function S represents S= T/q S = q/w S=w/T S = q/T S = q/T

24. In a reversible process, the

systems and surroundings

should remains at

same temperature same pressure same temperature &

pressure

different temperature

and pressure

same temperature

25. Spontaneous process takes only

at

forward direction backward

direction

both forward and

backward direction

only one direction only one direction

26. Carnot's cycle depends upon the temperature of heat pressure of the substance

volume of the substance working substance temperature of heat

27. Entropy remains constant in adiabatic process isothermal

process

isochoric process isolated process isothermal process

28. The entropy of a system in a

irreversible process

increases decreases remains constant none of these increases

29. Choose the correct statement all quasi-static process

are reversible

all reversible

process are

quasistatic

adiabatic process is

quasi-static

none of these all reversible process

are quasistatic

30. When water vapour condenses

into water its entropy

increases decreases remains unchanged first decreases and

then increases

decreases

31. Entropy is measure of perfect order available energy disorder none of these disorder

32. Entropy is maximum in which

state

solid liquid gas can be any gas

33. The area of the rectangle of the

T-S diagram represents____ in

a reversible Carnot’s cycle.

external work done internal work

done

increase in volume increase in pressure external work done

34. The 2nd law of

thermodynamics can be stated

in terms of____________of a

system.

enthalpy specific heat temperature entropy entropy

35. A process, in which no heat is

supplied or rejected from the

system and entropy is not constant, is called

isothermal isentropic polytropic hyperbolic polytrophic

25

36. In a reversible polytropic

process

enthalpy remains

constant

entropy remains

constant

some heat transfer occurs internal energy

remains constant.

entropy remains

constant

37. A process, in which the

working substance neither

receives nor gives out heat to its

surroundings during its

expansion or contraction, is

called isothermal process

isentropic

process polytropic process adiabatic process. isothermal process

38. Which of the following is a characteristic of an adiabatic

process?

ΔU = W = 0 Q = 0 ΔV = Q = 0

39. Work done in an adiabatic

process between a given pair of

end states depends on

the end states only particular

adiabatic process

the value of index n the value of heat

transferred

the end states only

40. Heat and work are point functions system properties path functions intensive properties path functions

41. A container filled with a sample

of an ideal gas at the pressure of

1.5 atm. The gas is compressed

isothermally to one-fourth of its

original volume. What is the

new pressure of the gas?

2 atm 3 atm 4 atm 5 atm 6 atm

42. The value of n = 1 in the

polytropic process indicates it

to be

reversible process isothermal

process

adiabatic process irreversible process isothermal process

KARPAGAM ACADEMY OF HIGHER …...42. The unit of thermal capacity mcq c = 1/m (dq/dt) mc calories/C none of the above mc calories/C 43. One therm is in 10 5 pounds quantity of water

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