The figure shows a process on a gas in which pressure and volume both change. The molar heat capacity for this process is C.
1. C = 0
2. C = CV
3. C > CV
4. C < CV
The molar heat capacity for the process shown in the following figure is:
1. C = Cp
2. C = Cv
3. C > CV
4. C =0
In an isothermal process on an ideal gas, the pressure increases by 0.5%. The volume decreases by about
1. 0.25%
2. 0.5%
3. 0.7%
4. 1%.
In an adiabatic process on a gas with y = 1.4, the pressure is increased by 0.5%. The volume decreases by about
1. 0.36%
2. 0.5%
3. 0.7%
4. 1%.
Two samples A and B are initially kept in the same state. The sample A is expanded through an adiabatic process and the sample B through an isothermal process. The final volumes of the samples are the same. The final pressures in A and B are pA and pB respectively.
1. PA > PB
2. PA = PB
3. PA < PB
4. The relation between pA and pB cannot be deduced.
Let Ta and Tb be the final temperatures of the samples A and B respectively in the previous question.
1. Ta < Tb
2. Ta = Tb
3. Ta > Tb
4. The relation between Ta and Tb cannot be deduced.
Previous Question: Two samples A and B are initially kept in the same state. The sample A is expanded through an adiabatic process and the sample B through an isothermal process. The final volumes of the samples are the same.
Let ΔWa and ΔWb be the work done by the systems A and B respectively in the previous question.
1. ΔWa > ΔWb
2. ΔWa = ΔWb
3. ΔWa < ΔWb
4. The relation between ΔWa and ΔWb cannot be deduced
Previous Question: Two samples A and B are initially kept in the same state. The sample A is expanded through an adiabatic process and the sample B through an isothermal process. The final volumes of the samples are the same.
The molar heat capacity of oxygen gas at STP is nearly 2.5 R. As the temperature is increased, it gradually increases and approaches 3.5 R. The most appropriate reason for this behaviour is that at high temperatures
1. oxygen does not behave as an ideal gas
2. oxygen molecules dissociate in atoms
3. the molecules collide more frequently
4. molecular vibrations gradually become effective
A gas kept in a container of finite conductivity is suddenly compressed. The process
a. must be very nearly adiabatic
b. must be very nearly isothermal
c. may be very nearly adiabatic
d. may be very nearly isothermal
Choose the correct option
1. (a) , (b)
2. (b) , (c)
3. (c) , (d)
4. (a) , (d)
Let Q and W denote the amount of heat given to an ideal gas and the work done by it in an isothermal process.
(a) Q = 0
(b) W = 0
(o) Q ≠ W
(d) Q = W
Choose the correct option
1. (a) , (b)
2. (b) , (c)
3. (d) only
4. (a) , (d)