(a) Internal energy of the gas increases (b) Internal energy of the gas decreases (c) Internal energy remains unchanged (d) Average kinetic energy of gas molecule decreases Ans. c (12)
(a) Never (b) Yes (c) They will cut when temperature is 0°C (d) Yes, when the pressure is critical pressure Ans. a (8)
(a) Heat content remains constant (b) Heat content and temperature remain constant (c) Temperature remains constant (d) None of the above Ans. c (11)
(a) It introduces the concept of the internal energy (b) It introduces the concept of the entropy (c) It is not applicable to any cyclic process (d) None of the above Ans. b (20)
(a) Zero (b) Negligible (c) Negative (d) Positive Ans. c (5)
8 x 105 J of heat and doing 6.5 x 105 J of external work. It is now transferred between the same two states in another process in which it absorbs 105J of heat. Then in the second process (a) Work done …
(a) Pressure only (b) Volume only (c) Pressure, volume and temperature (d) Number of moles Ans. c (10)
(a) More for (i) (b) More for (ii) (c) Same in both cases (d) Independent of number of moles Ans. c (6)
(a) 18J (b) 9J (c) 4.5J (d) 36J Ans .a (5)
(a) 19.1 kJ (b) 12.5 kJ (c) 25 kJ (d) Zero Ans. a (6)
(a) 19.1 kJ (b) 12.5 kJ (c) 25 kJ (d) Zero Ans. a (6)
at constant pressure 2.1 x 105N/m2 , there was an increase in its volume equal to 2.5 x 10-3 m3. The increase in internal energy of the gas in Joules is (a) 450 …
(a) Zeroth law of thermodynamics (b) First law of thermodynamics (c) Second law of thermodynamics (d) Newton’s law of cooling Ans. a (5)
to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is (a) R/( γ – 1) …
(a) Its temperature will increase (b) Its temperature will decrease (c) Its temperature will remain constant (d) None of these Ans. a (5)
(a) Increases by 600 J (b) Decreases by 800 J (c) Increases by 800 J (d) Decreases by 50 J Ans. c (8)
(a) 7 : 6 (b) 6 : 7 (c) 36 : 49 (d) 49 : 36 Answer-b (159)
(a) Kinetic energy only (b) Kinetic and potential energy (c) Potential energy (d) None of these Ans. a (4)
(a) P (b) T (c) V (d) R Ans. d (9)
(a) Enthalpy (b) Work done (c) Gibb’s energy (d) Internal energy Ans. b (12)
(a) 150 J (b) 70 J (c) 110 J (d) 40 J Ans. b (5)
1m3 is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at 300 K. The other compartment is vacuum. The whole system is thermally isolated from its surroundings. The partition is removed and …
Δw when an amount of heat is ΔQ added to the system, the corresponding change in the internal energy is ΔU . A unique function of the initial and final states (irrespective of the mode of change) is (a) …
(a) 7900 J (b) 8200 J (c) 5600 J (d) 6400 J Ans. a (5)
of one atmosphere from 00c to 1000c . Then the change in the internal energy is (a) 6.56 joules (b) 8.32 x 102 joules (c) 12.48 x 102 joules (d) 20.80 joules Ans. c (15)
(a) 0.56×104 J (b) 1.3×102 J (c) 2.7×102 J (d) 3.4×103 J Answer-d (9)
(a) 4.6×103 K (b) 11.6×103 K (c) 23.2×103 K (d) 7.7×103 K Answer-d (4)
(a) Newton’s law (b) Law of conservation of energy (c) Charle’s law (d) Law of heat exchange Ans. b (5)
(a) (3/2)kT (b) kT (c) (1/2)kT (d) (3/2)RT Answer-c …
(a) Only potential energy (b) Only kinetic energy (c) Potential and kinetic energy both (d) None of the above Answer-b (10)
(a) Temperature (b) Energy (c) Work (d) None of these Ans. a (9)
T1 and T2 are mixed. There is no loss of energy. The masses of the molecules are m1 and m2 and the number of molecules in the gases are n1 and n2 The temperature of mixture will be (a) (T1 …
(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 (10)
(a) 30 J (b) 20 J (c) 60 J (d) 40 J Ans. c (5)
(a) P (b) < P (c) > P (d) Zero Answer-c (4)
(a) Increase continuously (b) Decreases continuously (c) First increases and then decreases (d) First increase and then becomes constant Answer-c (4)
CO2 mixture at 27°C. If R = 8.31 J/mole kelvin, then the pressure in the vessel in N/m2 will be (approx.) (a) 5×105 (b) 5×104 (c) 106 …
(a) The internal energy changes in all processes (b) Internal energy and entropy are state functions (c) The change in entropy can never be zero (d) The work done in an adiabatic process is always zero (19)
(a) 100 J (b) 3000 J (c) 450 J (d) 150 J Answer-d (17)