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Physics

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9. Two identical samples of a gas are allowed to expand (i) isothermally (ii) adiabatically. Work done is

(a)  More in the isothermal process (b)  More in the adiabatic process (c)   Neither of them (d)  Equal in both...

7. The pressure and density of a diatomic gas (γ=7/5)  change adiabatically from (P, d) to (P’, d’). If (d’/d)=32 , then P’/P  should be

(a)  1/128                                (b)  32 (c)   128                                    (d)  None of the above Answer-c (8)

5.  A gas at NTP is suddenly compressed to one-fourth of its original volume.

If γ  is supposed to be (3/2) , then the final pressure is (a)  4 atmosphere                    (b)  3/2 atmosphere (c)  ...

4. The pressure in the tyre of a car is four times the atmospheric pressure

at 300 K. If this tyre suddenly bursts, its new temperature will be ( γ=1.4) (a)     300 (4)1.4/0.4   ...

3. In adiabatic expansion

(a)  ΔU = 0                             (b)  ΔU =...

2. The work done in an adiabatic change in a gas depends only on

(a) Change is pressure               (b) Change is volume (c) Change in temperature     ...

1. If a cylinder containing a gas at high pressure explodes, the gas undergoes

(a)  Reversible adiabatic change and fall of temperature (b)  Reversible adiabatic change and rise of temperature (c)   Irreversible adiabatic change...

31. During an isothermal expansion of an ideal gas

(a)  Its internal energy decreases (b)  Its internal energy does not change (c)   The work done by the gas is...

40. The volume of an ideal gas is 1 litre and its pressure is equal to 72cm of mercury column.

The volume of gas is made 900 cm3 by compressing it isothermally. The stress of the gas will be (a) ...

29. A cylinder fitted with a piston contains 0.2 moles of air at temperature

27°C. The piston is pushed so slowly that the air within the cylinder remains in thermal equilibrium with the surroundings....

28. One mole of an ideal gas expands at a constant temperature of 300 K from an initial volume of 10 litres to a final volume of 20 litres. The work done in expanding the gas is

(R = 8.31 J/mole–K) (a)  750 joules                                  (b)  1728 joules (c)   1500 joules               ...

27. 540 calories of heat convert 1 cubic centimeter of water at 100°C into 1671 cubic centimeter of steam at 100°C  at a pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly

(a)  540 cal                               (b)  40 cal (c)   Zero cal                              (d)  500 cal Answer-b (6)

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...

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