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2022

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26. The latent heat of vaporisation of water is 2240 J/gm. If the work done in the process of expansion of 1 g is 168 J, then increase  in internal energy is 

(a)  2408 J                                (b)  2240 J (c)   2072 J                                (d)  1904 J Answer-c (9)

25. When 1 gm of water at 0°C and

1×105 N/m2 pressure is converted into ice of volume 1.091 cm3 , the external work done will be (a)  0.0091...

24. When heat is given to a gas in an isothermal change, the result will be

(a)  External work done (b)  Rise in temperature (c)   Increase in internal energy (d)  External work done and also rise...

22. If an ideal gas is compressed isothermally then

(a)  No work is done against gas (b)  Heat is relased by the gas (c)   The internal energy of gas...

21. A thermodynamic process in which temperature T of the system remains constant though other variable P and V may change, is called

(a)  Isochoric process              (b)  Isothermal process (c)   Isobaric process                (d)  None of these Explanation-(b)          In isothermal process, temperature remains constant....

20. In an isothermal process the volume of an ideal gas is halved. One can say that

(a)  Internal energy of the system decreases (b)  Work done by the gas is positive (c)   Work done by the...

19. A container that suits the occurrence of an isothermal process should be made of

(a)  Copper                               (b)  Glass (c)   Wood                                 (d)  Cloth Explanation-(a) An  isothermal process takes place at constant temperature, must be...

18. A thermally insulated container is divided into two parts by a screen. In one part the pressure and temperature are P and T for an ideal gas filled. In the second part it is vacuum. If now a small hole is created in the screen, then the temperature of the gas will

(a)  Decrease                            (b)  Increase (c)   Remain same                    (d)  None of the above Answer-c (13)

17. The specific heat of a gas in an isothermal process is

(a)  Infinite                               (b)  Zero (c)   Negative                            (d)  Remains constant Answer-a (12)

15. In isothermic process, which statement is wrong

(a)  Temperature is constant (b)  Internal energy is constant (c)   No exchange of energy (d)  (a) and (b) are correct...

14. In an isothermal change, an ideal gas obeys

(a)  Boyle’s law                        (b)  Charle’s law (c)   Gaylussac law                    (d)  None of the above Answer-a (14)

13. The isothermal bulk modulus of a perfect gas at normal pressure is

(a) 1.013×105 N/m2             (b) 1.013×106 N/m2 (c) 1.013×10-11 N/m2               (d) 1.013×1011 N/m2...

10. Work done per mol in an isothermal change is

(a) RT log10 (V2/V1)                          (b) RT log10 (V1/V2)...

59. The average kinetic energy of hydrogen molecules at 300 K is E. At the same temperature, the average kinetic energy of oxygen molecules will be

(a)  E/4                          (b)  E/16 (c) E                               (d)  4...

12. In isothermal expansion, the pressure is determined by

(a)  Temperature only (b)  Compressibility only (c)   Both temperature and compressibility (d)  None of these Answer-b (8)

11. The isothermal Bulk modulus of an ideal gas at pressure P is

(a)  P                                         (b) γ (c)   P / 2                                   (d)  P /γ Answer-a (9)

9. If a gas is heated at constant pressure, its isothermal compressibility

(a)  Remains constant (b)  Increases linearly with temperature (c)   Decreases linearly with temperature (d)  Decreases inversely with temperature Answer-a (13)

8. One mole of

O2 gas having a volume equal to 22.4 litres at 0°C and 1 atmospheric pressure in compressed isothermally so that...

7. The gas law (PV)/T constant is true for

(a) Isothermal changes only (b)  Adiabatic changes only (c)   Both isothermal and adiabatic changes (d)  Neither isothermal nor adiabatic changes...

6. For an isothermal expansion of a perfect gas,

the value of ΔP/P  is equal (a)     – γ1/2  ΔV/V                    (b)  -(ΔV/V) (c)        -γ1 ΔV/V                         (d)...

5. A vessel containing 5 litres of a gas at 0.8 m pressure is connected to an evacuated vessel of volume 3 litres. The resultant pressure inside will be (assuming whole system to be isolated)

(a)  4/3 m                                 (b)  0.5 m (c)   2.0 m                                  (d)  3/4 m Ans. b (11)

4. In an isothermal reversible expansion, if the volume

of 96 gm of oxygen at 27°C is increased from 70 litres to 140 litres, then the work done by...

3. In an isothermal expansion

(a)  Internal energy of the gas increases (b)  Internal energy of the gas decreases (c)   Internal energy remains unchanged (d) ...

2. Can two isothermal curves cut each other

(a)  Never (b)  Yes (c)   They will cut when temperature is 0°C (d)  Yes, when the pressure is critical pressure...

1. For an ideal gas, in an isothermal process

(a)  Heat content remains constant (b)  Heat content and temperature remain constant (c)   Temperature remains constant (d)  None of the...

48. Which of the following is incorrect regarding the first law of thermodynamics

(a)  It introduces the concept of the internal energy (b)  It introduces the concept of the entropy (c)   It is...

47. If a system undergoes contraction of volume then the work done by the system will be

(a)  Zero                                    (b)  Negligible (c)   Negative                            (d)  Positive Ans. c (7)

46. A perfect gas goes from state A to another state B by absorbing

8 x 105 J of heat and doing 6.5 x 105 J  of external work. It is now transferred between the...

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...

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