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Practice each question, then open the answer or worked solution.
An ideal gas undergoes four different processes from the same initial state. Four processes are adiabatic, isothermal, isobaric, and isochoric. Out of 1, 2, 3, and 4 which one is adiabatic
The correct answer is c) 2
If an average person jogs, he produces 14.5 × 103 cal/min. This is removed by the evaporation of sweat. The amount of sweat evaporated per minute is assuming 1 kg requires 580 × 103 cal for evaporation
a) 0.25 kg
b) 2.25 kg
c) 0.05 kg
d) 0.20 kg
The correct answer is a) 0.25 kg
Consider P-V diagram for an ideal gas shown in the figure.
Out of the following diagrams, which represent the T-P diagram?
a) iv
b) ii
c) iii
d) i
The correct answer is c) iii
An ideal gas undergoes cyclic process ABCDA as shown in the given P-V diagram. The amount of work done by the gas is
a) 6P0V0
b) -2P0V0
c) +2P0V0
d) +4P0V0
The correct answer is d) +4P0V0
Consider two containers A and B containing identical gases at the same pressure, volume, and temperature. The gas in container A is compressed to half of its volume isothermally while the gas in the container B is compressed to half of its original value adiabatically. The ratio of final pressure of a gas in B to that of gas in A is
a)
b)
c)
d)
The correct answer is a)
Three copper blocks of masses M1, M2, and M3 kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at T1, T2, T3 (T1 > T2 > T3). Assuming there is no heat loss to the surroundings, the equilibrium temperature T is
a)
b)
c)
d)
The correct answer is b)
Which of the process described below are irreversible?
The correct answers are
a) the increase in temperature of an iron rod by hammering it
b) a gas in a small container at a temperature T1 is brought in contact with a big reservoir at a higher temperature T2 which increases the temperature of the gas
d) an ideal gas is enclosed in a piston-cylinder arrangement with adiabatic walls. A weight W is added to the piston resulting in compression of gas
An ideal gas undergoes isothermal process from some initial state I to final state f. Choose the correct alternatives
The correct answers are
a) dU = 0
d) dQ = dW
Figure shows the P-V diagram of an ideal gas undergoing a change of state from A to B. Four different parts I, II, III, and IV as shown in the figure may lead to the same changes of state.
a) change in internal energy is the same in IV and III cases, but not in I and II
b) change in internal energy same in all the four cases
c) work done is maximum in case I
d) work done is minimum in case II
The correct answers are
b) change in internal energy same in all the four cases
c) work done is maximum in case I
Consider a cycle followed by an engine
1 to 2 is isothermal
2 to 3 is adiabatic
3 to 1 is adiabatic
Such a process does not exist because
a) heat is completely converted to mechanical energy in such a process, which is not possible
b) mechanical energy is completely converted to heat in this process, which is not possible
c) curves representing two adiabatic processes don’t intersect
d) curves representing an adiabatic process and an isothermal process don’t intersect
The correct answers are
a) heat is completely converted to mechanical energy in such a process, which is not possible
c) curves representing two adiabatic processes don’t intersect