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Physics

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45. The state of a thermodynamic system is represented by

(a)  Pressure only (b)  Volume only (c)   Pressure, volume and temperature (d)  Number of moles Ans. c (12)

44. A monoatomic gas of n-moles is heated from temperature T1 to T2 under two different conditions (i) at constant volume . and (ii) at constant pressure. The change in internal energy of the gas is

(a)  More for (i) (b)  More for (ii) (c)   Same in both cases (d)  Independent of number of moles Ans....

43. In a thermodynamics process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8J of work is done on the gas. If the initial internal energy of the gas was 30J. The final internal energy will be

(a)    18J              (b)  9J (c)   4.5J             (d)  36J...

42. If heat given to a system is 6 kcal and work done is 6 kJ. Then change in internal energy is

(a)   19.1 kJ                             (b)  12.5 kJ (c)   25 kJ                               (d) Zero Ans. a (10)

42. If heat given to a system is 6 kcal and work done is 6 kJ. Then change in internal energy is

(a)   19.1 kJ                                (b)  12.5...

41. When heat energy of 1500 Joules, is supplied to a gas

at constant pressure 2.1 x 105N/m2 , there was an increase in its volume equal to 2.5 x 10-3 m3....

40. Temperature is a measurement of coldness or hotness of an object. This definition is based on

(a)  Zeroth law of thermodynamics (b)  First law of thermodynamics (c)   Second law of thermodynamics (d)  Newton’s law of cooling...

39. If

Cv = 4.96 cal/mole K, then increase in internal energy when temperature of 2 moles of this gas is increased...

38. If the ratio of specific heat of a gas at constant pressure

to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume...

34. Heat is not being exchanged in a body. If its internal energy is increased, then

(a)  Its temperature will increase (b)  Its temperature will decrease (c)   Its temperature will remain constant (d)   None of these...

32. A system is provided with 200 cal of heat and the work done by the system on the surrounding is 40 J. Then its internal energy

(a)  Increases by 600 J            (b)  Decreases by 800 J (c)   Increases by 800 J            (d)  Decreases by 50 J...

46. Two gases are at absolute temperatures 300 K and 350 K respectively. Ratio of average kinetic energy of their molecules is

(a) 7 : 6                           (b) 6 : 7...

30. In a thermodynamic system working substance is ideal gas, its internal energy is in the form of

(a)  Kinetic energy only (b)  Kinetic and potential energy (c)   Potential energy (d)  None of these Ans. a (5)

26. Which of the following is not a thermodynamics co-ordinate

(a)  P                                         (b)  T (c)   V                                         (d)  R Ans. d (10)

16. Which of the following is not thermodynamical function

(a)  Enthalpy                            (b)  Work done (c)   Gibb’s energy                    (d)  Internal energy Ans. b (13)

15. 110 J of heat is added to a gaseous system, whose internal energy change is 40 J, then the amount of external work done is

(a)  150 J                                  (b)  70 J (c)   110 J                                  (d)  40 J Ans. b (6)

14. A container of volume

1m3 is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at 300...

13. A system performs work

Δw when an amount of heat is ΔQ added to the system, the corresponding change in the internal energy is...

12. Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joule of work

(a)  7900 J                                (b)  8200 J (c)   5600 J                                (d) 6400 J Ans. a (7)

37. One mole of an ideal monoatomic gas is heated at a constant pressure

of one atmosphere from  00c to 1000c . Then the change in the internal energy is (a)  6.56 joules                         (b)...

58. The kinetic energy of one gm-mole of a gas at normal temperature and pressure is (R = 8.31 J/Mole-K)

(a)  0.56×104 J                        (b) 1.3×102 J (c) 2.7×102 J                       ...

57. The temperature at which the average translational kinetic energy of a molecule is equal to the energy gained by an electron in accelerating from rest through a potential difference of 1 volt is

(a)  4.6×103 K                         (b)  11.6×103 K (c) 23.2×103 K                      (d)  7.7×103...

36. First law of thermodynamics is a special case of

(a)   Newton’s law (b)  Law of conservation of energy (c)   Charle’s law (d)  Law of heat exchange Ans. b (6)

56. Mean kinetic energy per degree of freedom of gas molecules is

(a) (3/2)kT                                   (b) kT...

55. The molecules of an ideal gas at a certain temperature have

(a) Only potential energy (b) Only kinetic energy (c) Potential and kinetic energy both (d) None of the above Answer-b...

35. Out of the following which quantity does not depend on path

(a)  Temperature                    (b)  Energy (c)   Work                                  (d)  None of these Ans. a (11)

54. Two ideal gases at absolute temperature

T1 and T2 are mixed. There is no loss of energy. The masses of the molecules are m1 and m2...

53. The total momentum of the molecules of 1 gm mol of a gas in a container at rest of 300 K is

(a) 2×√3R×300 gm×cm/sec (b) 2×3×R×300 gm×cm/sec (c) 1×√3R×300 gm×cm/sec (d) Zero Answer-d (15)

33. In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out 20 J of heat and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be

(a)  30 J                  (b)  20 J (c) 60 J       ...

52. In the absence of intermolecular force of attraction, the observed pressure P will be

(a)    P                            (b)  < P (c) >...

51. Vapour is injected at a uniform rate in a closed vessel which was initially evacuated. The pressure in the vessel

(a) Increase continuously (b) Decreases continuously (c) First increases and then decreases (d) First increase and then becomes constant Answer-c...

50. The capacity of a vessel is 3 litres. It contains 6 gm oxygen, 8 gm nitrogen and 5 gm

CO2 mixture at 27°C. If R = 8.31 J/mole  kelvin, then the pressure in the vessel in N/m2  will be (approx.)...

31. Which of the following statements is correct for any thermodynamic system

(a) The internal energy changes in all processes (b)  Internal energy and entropy are state functions (c)   The change in...

49. The mean kinetic energy of a gas at 300 K is 100 J. The mean energy of the gas at 450 K is equal to

(a)  100 J                               (b) 3000 J (c) 450 J                       ...

48. On colliding in a closed container the gas molecules

(a) Transfer momentum to the walls (b) Momentum becomes zero (c) Move in opposite directions (d) Perform Brownian motion Answer-a...

29. Which of the following parameters does not characterize the thermodynamic state of matter

(a)  Volume                              (b)  Temperature (c)   Pressure                            (d)  Work Ans. d (6)

28. The specific heat of hydrogen gas at constant pressure

is Cp=3.4 x 103 cal/kg  0c and at constant volume is Cv= 2.4 x103 cal/kg  0c. If one kilogram hydrogen...

27. In a given process for an ideal gas, dW = 0 and dQ<0. Then for the gas

(a)  The temperature will decrease (b)  The volume will increase (c)   The pressure will remain constant (d)  The temperature will...

25. Which of the following can not determine the state of a thermodynamic system

(a)  Pressure and volume (b)  Volume and temperature (c)   Temperature and pressure (d)  Any one of pressure, volume or temperature...

24. For free expansion of the gas which of the following is true

(a) Q=W=0      and ΔEint =0 (b)  Q=0,W>0 and ΔEint =-W (c)  W=0,Q>0,  and ΔEint = Q (d) W>0,Q<0 ...
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