thermodynamics MCQs – Page 3

Practise focused thermodynamics questions with marked answers for exam preparation and subject revision.

thermodynamics Mcqs

41. Kinetic theory of gases assumes that the collisions between the molecules are________________?
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A. perfectly inelastic

B. perfectly elastic

C. partly inelastic

D. partly elastic and partly inelastic

E. partly elastic

42. Zeroth law of thermodynamics________________?
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A. deals with conversion of mass and energy

B. deals with reversibility and irreversibility of process

C. states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

D. deals with heat engines

E. does not exist

43. Which of the following variables controls the physical properties of a perfect gas_________________?
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A. temperature

B. all of the above

C. pressure

D. volume

E. atomic mass

44. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure___________________?
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A. specific volume

B. entropy

C. mass

D. enthalpy

E. volume

45. Molecular volume of any perfect gas at 600 x 103 N/m2 and 27C will be ____________________?
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A. 0.15 m3/kg mol

B. 400 m3/kg mol

C. 417m3/kgmol

D. 4.17m3/kgmol

E. 41.7 m3/kg mol

46. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at ____________________?
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A. a temperature of 273.16C

B. a temperature of 0C

C. a temperature of 273 K

D. a negative pressure and 0C temperature

E. cant be attained

47. Absolute zero pressure will occur _____________________?
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A. at the center of the earth

B. at sea level

C. when molecular momentum of the system becomes zero

D. at a temperature of 273 K

E. under vacuum conditions

48. Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?
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A. 2

B. 1

C. 0.75

D. 1.35

E. 1.27

49. Which of the following is not the intensive property___________________?
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A. density

B. specific volume

C. heat

D. pressure

E. temperature

50. Heat and work are ____________________?
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A. system properties

B. path functions

C. point functions

D. intensive properties

E. extensive properties

51. The following cycle is used for air craft refrigeration___________________?
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A. Brayton cycle

B. Joule cycle

C. Reversed-Brayton cycle

D. Carnot cycle

E. Bell-Coleman cycle

52. A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?
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A. 300 Nm

B. 300,000 Nm

C. 3000 Nm

D. 30,000 Nm

E. 30 Nm

53. The door of a running refrigerator inside a room was left open____________________?
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A. ch of the following statements is correct ?

54. A perfect gas at 27C is heated at constant pressure till its volume is double. The final temperature is________________?
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A. 327C

B. 54C

C. 108C

D. 654C

E. 600C

55. If a system after undergoing a series of processes, returns to the initial state then__________________?
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A. its entropy will change due to irreversibility

B. process is thermodynamically in equilibrium

C. process is executed in closed system cycle

D. no work will be done by the system

E. sum of heat and work transfer will be zero

56. The index of compression n tends to reach ratio of specific heats y when____________________?
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A. process is isentropic and specific heat does not change with temperature

B. flow is uniform and steady

C. process is isentropic

D. process is isentropic and specific heat changes with temperature

E. process is isothermal

57. According to Avogadros law, for a given pressure and temperature, each molecule of a gas_________________?
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A. occupies volume proportional to its molecular weight

B. occupies volume proportional to its specific weight

C. occupies volume inversely proportional to its molecular weight

D. occupies volume inversely proportional to its specific weight

E. occupies same volume

58. The unit of pressure in S.I. units is____________________?
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A. dynes per square cm

B. bars

C. kg/cm2

D. mm of water column

E. pascal

59. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?
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A. volume

B. entropy

C. pressure

D. internal energy

E. temperature

60. Universal gas constant is defined as equal to product of the molecular weight of the gas and_______________?
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A. gas constant

B. specific heat at constant pressure

C. ratio of two specific heats

D. specific heat at constant volume

E. unity.

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