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2022

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24. An engineer claims to have made an engine delivering 10 kW power with fuel consumption of 1 g/sec. The calorific value of the fuel is 2 kcal/g. Is the claim of the engineer

(a) Valid (b)  Invalid (c)   Depends on engine design (d)  Depends of the load Answer-b (4)

23. A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62°C, the efficiency of the engine is doubled. The temperatures of the source and sink are

(a)  80°C, 37°C                                (b)  95°C, 28°C (c)   90°C, 37°C                       ...

22.A thermally insulated rigid container contains an ideal gas heated by a filament of resistance 100Ω through a current of 1A for 5 min then change in internal energy is 

(a) 0 kJ                                   ...

21. Initial pressure and volume of a gas are P and V respectively. First it is expanded isothermally to volume 4V and then compressed adiabatically to volume V. The final pressure of gas will be

(a)  1P                                     ...

20. Two samples A and B of a gas initially at the same pressure and temperature are compressed from volume V to V/2 (A isothermally and adiabatically). The final pressure of A is

(a)  Greater than the final pressure of B (b)  Equal to the final pressure of B (c)   Less than the...

19.Which one of the following gases possesses the largest internal energy

  (a)  2 moles of helium occupying  1m3 at 300 K (b)  56 kg of nitrogen at 107N/m2 and 300...

18. When an ideal gas (γ=5/3 ) is heated under constant pressure, then what percentage of given heat energy will be utilised in doing external work

(a)  40 %                                  (b)  30 % (c)   60 %                                  (d)  20 % Answer-a (9)

17. When an ideal monoatomic gas is heated at constant pressure, fraction of heat energy supplied which increases the internal energy of gas, is

(a) 2/5                                     ...

16. Two Carnot engines A and B are operated in succession. The first one, A receives heat from a source at

T1=800K and rejects to sink at T2K . The second engine B receives heat rejected by the first engine and...

15. The temperature of a hypothetical gas increases to √2 times when compressed adiabatically to half the volume. Its equation can be written as

(a) PV3/2  = constant             (b) PV5/2 = constant (c)  PV7/3 = constant             (d) PV4/3 = constant Answer-a (7)

14. The volume of air increases by 5% in its adiabatic expansion. The percentage decrease in its pressure will be

(a)  5%                                     (b)  6% (c)   7%                                     (d)  8% Answer-c (4)

13. An insulator container contains 4 moles of an ideal diatomic gas at temperature T. Heat Q is supplied to this gas, due to which 2 moles of the gas are dissociated into atoms but temperature of the gas remains constant. Then

(a)   Q = 2RT                         (b) Q=RT (c)    Q= 3RT ...

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The molar heat capacity in a process of a diatomic gas if it does a work of Q/4 when a heat of Q is supplied to it is

(a)   (2/5)R                               (b)  (5/2)R (c)  (10/3)R ...

11. A cylindrical tube of uniform cross-sectional area A is fitted with two air tight frictionless pistons.

temperature is T0, atmospheric pressure is also P0. Now the temperature of the gas is increased to 2T0, the tension...

10. Work done by a system under isothermal change from a

volume V1 to V2  for a gas which obeys Vander Waal’s equation (V – βn)[ P + (αn2/v)= nRT (a) ...

9. An ideal gas expands isothermally from a

(a)     P3 > P1 , W > 0            (b)  P3 < P1 , W...

8. A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

(a)  4 RT                                    (b)  15 RT (c)   9 RT                                    (d)  11 RT Ans. d (16)

15. The temperature of a hypothetical gas increases to √2 times when compressed adiabatically to half the volume. Its equation can be written as

(a) PV3/2 = constant             (b) PV5/2 = constant (c) PV7/3  = constant             (d) PV4/3= constant Answer-a (9)

14. The volume of air increases by 5% in its adiabatic expansion. The percentage decrease in its pressure will be

(a)  5%                                     (b)  6% (c)   7%                                     (d)  8% Answer-c (6)

13. An insulator container contains 4 moles of an ideal diatomic gas at temperature T. Heat Q is supplied to this gas, due to which 2 moles of the gas are dissociated into atoms but temperature of the gas remains constant. Then

(a) Q=2RT                           (b) Q=RT (c) Q=3RT     ...

12. The molar heat capacity in a process of a diatomic gas if it does a work of  Q/4 when a heat of Q is supplied to it is

(a) (2/5)R                                    (b)...

11. A cylindrical tube of uniform cross-sectional area A is fitted with two air tight frictionless pistons. The pistons are connected to each other by a metallic wire. Initially the pressure of the gas is

P0 and temperature is T0, atmospheric pressure is also P0. Now the temperature of the gas is increased to 2T0,...

10. Work done by a system under isothermal change from a volume

V1 to V2  for a gas which obeys Vander Waal’s equation (V-βn)[P+(αn2/V)]=nRT (a) nRT loge  [ (V2-nβ)/( V1-nβ) ]+αn2[(V1 –...

9. An ideal gas expands isothermally from a volume

V1 to V2 and then compressed to original volume V1 adiabatically. Initial pressure is P1  and final pressure is P3...

8. A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

(a)  4 RT                                    (b)  15 RT (c)   9 RT                                    (d)  11 RT Answer-d (6)

7. A mono atomic gas is supplied the heat Q very slowly keeping the pressure constant. The work done by the gas will be

(a)   (2/3)Q                                  (b) (3/5)Q...

A closed hollow insulated cylinder is filled with gas

at 00C and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas...

5. A monoatomic ideal gas, initially at temperature

T1, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a...

4. Two identical containers A and B with frictionless pistons contain the same ideal gas at the same temperature and the same volume V.

The mass of the gas in A is mB and that in B  is . The gas in each cylinder...

34. Which of the following processes is reversible

(a)      Transfer of heat by radiation (b)  Electrical heating of a nichrome wire (c)   Transfer of heat by conduction (d) ...

3. During the melting of a slab of ice at 273 K at atmospheric pressure

(a)  Positive work is done by ice-water system on the atmosphere (b)  Positive work is done on the ice-water system...

2. 1cm3 of water at its boiling point absorbs 540 calories of heat to become steam with a

volume of 1671 cm3 .If the atmospheric pressure = 1.013 x 105 N/m3 and the mechanical equivalent of heat =...

1. When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas, is

(a) 2/5                                    (b)...

33. An ideal gas heat engine operates in Carnot cycle

between 227°C and 127°C. It absorbs 6 x 104 cals of heat at higher temperature. Amount of heat converted to...

32. An engine is supposed to operate between two reservoirs

at temperature 727°C and 227°C. The maximum possible efficiency of such an engine is (a)  1/2                                     (b)  1/4 (c)  ...

31. In a mechanical refrigerator, the low temperature coils are at a temperature

of – 23°C and the compressed gas in the condenser has a temperature of 27°C. The theoretical coefficient of performance...

30. An ideal refrigerator has a freezer at a temperature of

-130c .  The coefficient of performance of the engine is 5. The temperature of the air (to which heat is...

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