Physics XII Chapter Heat & Thermodynamics

1. Collision between gas molecules are perfectly: a) Both elastic and In-elastic b) None of these c) Elastic d) In-elastic

2. Temperature of human body in Kelvin scale is: a) 325 K b) 20 K c) 310 K d) 273 K

3. According to kinetic theory of gases the size of the molecule is: a) None of these b) Much larger than the separation between molecules c) Much smaller than the separation between the molecules d) Both a and b

4. ' R' is called : a) Universal gas constant b) Constant for Entropy c) Heat constant d) Liquid constant

5. When heat is added into the system entropy is: a) Positive b) Constant process c) None of these d) Negative

6. The curve representing as isothermal process is called: a) Parabola b) Isotherm c) Adiabatic d) Hyperbola

7. The unit of thermodynamic scale is: a) Centigrade b) Kelvin c) None of these d) Fahrenheit

8. Hotness or coldness of an object is expressed as: a) Thermal energy b) Heat c) Chemical energy d) Temperature

9. The concept of entropy was introduces into the study of thermodynamics: a) Coulombs b) Clausius c) Kelvin d) Carnot

10. How many process does a four stroke engine undergoes: a) 3 b) 4 c) 1 d) 2

11. If the volume of given mass of a gas is doubled at atmospheric pressure at 150 °Cthen its new temperature will be: a) 300 °C b) 600 °C c) 745 °C d) 573 °C

12. In all natural processes where heat flows from one system to another, there is always a net increase in : a) Pressure b) Entropy c) Volume d) Work

13. Adiabatic change occurs when the gas expands or compressed: a) Rapidly b) Moderately c) Slowly d) Gradually

14. The temperature of a normal human body is 98.6 °F, this temperature in centigrade is: a) 37 °C b) 33.5 °C c) 29.5 °C d) 42.5 °C

15. Entropy is: a) Both a & b b) State function c) None of these d) State

16. One °C is equal to: a) 2.16 div F b) 13.5 div F c) 1.8 div F d) 1 div F

17. The process in which pressure remains constant is called: a) Adiabatic b) Isobaric c) Isothermal d) Isotropic

18. The efficiency of Carnot engine depends upon on the: a) Nature of working substance b) None of these c) Both a & b d) Temperature of hot and cold reservoirs

19. Work done on the system is considered as: a) Negative b) Positive c) None of these d) Remains unchanged

20. The efficiency of a heat engine whose low temperature is at 17°C and the high temperature 200°C is: a) 70% b) 38% c) 45% d) 23%

21. On a hot day or in hot climate white clothes or the clothes with light colour are worn because: a) They are good reflectors b) Good absorber c) Good Emitter d) Best radiator

22. Heat required to raise the temperature of one mole of a substance through one deg Kelvin is called: a) Molar heat capacity b) Molar specific heat capacity c) Molar specific heat d) All of these

23. When a gas is heated in a sealed container, then which statement is applicable: a) The average speed of gas molecules remains the same b) The average distance between gas molecules increases c) Force of attraction between the molecules increases d) All are applicable

24. For a gas obeys Boyles Law if the pressure increases by 1%, then volume decreased by: a) 1 /100 b) 2% c) 100/ 1 % d) 1/2 %

25. If the work done by the system is at the cost of its internal energy than, a) Does not change b) None of these c) Internal energy of the system decreases d) Internal energy of the system increases

26. When we heat a substance, energy associated with its atoms & molecules: a) Decreases b) Increases c) None of these d) Doest not change

27. In the kinetic theory of gases, it is assumed that the collision between the molecules is: a) Perfectly elastic b) Partially elastic c) Perfectly inelastic d) None of these

28. The pressure exerted by a gas is: a) Directly proportional to the density of the gas b) Inversely proportional to the density of the gas c) Independent of the density of the gas d) Directly proportional to the square of density of gas

29. According to kinetic theory of gases the absolute temperature of a gas is: a) Directly proportional to average K.E of molecules b) Inversely proportional to the average K.E of the molecules c) Independent of the K.E of the molecules d) Dependent on both K.E & P.E of gas molecules

30. The root mean square velocity of a gas: a) Directly proportional to the density of a gas b) Inversely proportional to the density of a gas c) Directly proportional to the square root of density d) Inversely proportional to the square root of the density

31. The pressure exerted by the gas is: a) Directly proportional to the velocity of molecules b) Directly proportional to the mean square velocity of the molecules c) Directly proportional to the mean velocity of molecules d) Inversely proportional to the mean velocity of the molecules

32. The Boltzman's constant is equal to: a) RNA b) R/NA c) NA /R d) None of these

33. Elongation of a rod when heated is: a) Directly proportional to its original length b) Inversely proportional to its length c) Does not depends upon its length d) Depends upon its area

34. Absolute zero is: a) 0 °C b) 273 °C c) -273 °C d) -273 °C

35. An amount of heat given to a gas during isothermal conditions will be used: a) For increasing temperature b) For doing external work c) Doing external work as well as increase in temperature d) In increasing internal energy of the gas

36. If the temperature of the source is increased, the efficiency of Carnot engine: a) Decreases b) Increases c) Does not change d) will be equal to the efficiency of real engine

37. If the temperature of the sink is decreased, the efficiency of a Carnot engine: a) Decreases b) Increases c) Remains same d) First increases then decreases

38. Entropy of the universe tends to: a) A minimum b) Zero c) No particular value as it remains same d) Maximum

39. By opening the door of refrigerator which is placed inside a room: a) We can cool the room to a certain degree b) We can cool the room to the temperature inside the refrigerator c) Ultimately warm the room slightly d) Neither cool nor warm the room

40. If the two objects are in thermal equilibrium then they have the same: a) Kinetic energy b) Potential energy c) Thermal energy d) Temperature

41. Two heat engines have source temperature at 900K and 600K and their heat sinks are at 450K and 300Krespectively: a) Both are equal efficient b) A is more efficient then B c) A is less efficient then B d) None of these

42. Gases have: a) One specific heat b) Two specific heats c) Three specific heats d) No specific heat

43. Boyle's law is an example of: a) Latent heat process b) Isothermal process c) Adiabatic process d) Mechanical process

44. The pressure exerted by a column of mercury at 76cm high at O°C is called: a) 1 N/Kg b) 1 atmosphere c) 1 Cm3 d) 1 N/m2

45. One cubic meter is equal to: a) 106 cm3 b) 103 cm3 c) 102 cm3 d) 10-3 cm3

46. The process in which volume of a system remains constant is called: a) Isothermal b) Isochoric c) Adiabatic d) Isobaric

47. The universal gas constant per molecule in 1 mole is called: a) Planck's constant b) Stefan's constant c) Avogadro's constant d) Boltzmann's constant

48. Zero on Celsius scale is equal to: a) 0 K b) 212 K c) 32 K d) 273 K

49. A domestic pressure cooker is based on: a) Isobaric process b) Adiabatic process c) Isothermal process d) Isochoric process

50. In Fahrenheit scale the interval between lower and upper fixed points is equally divided into: a) 100 equal parts b) 212 equal parts c) 32 equal parts d) 180 equal parts

51. On Fahrenheit scale the boiling point of water is: a) 100 °F b) 212 °F c) 180 °F d) 373 °F

52. Absolute zero on Fahrenheit scale corresponds to: a) 32 deg F b) 180 deg F c) -460 deg F d) -32 deg F

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