Thermodynamics Test

Result

Thermodynamics Test - 70

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Question 1
4 / -1

A

B

C

D

Solution
Question 2
4 / -1

For adiabatic process, wrong statement is

A
dQ = 0

B
dU = – dW

C
Q = constant

D
Entropy is not constant
Question 3
4 / -1

A diatomic gas initially at 18°C is compressed adiabatically to one-eighth of its original volume. The temperature after compression will be

A
10^o C

B
887^o C

C
668 K

D
144^o C

Solution
Question 4
4 / -1

If γ = 2.5 and volume is equal to 1/8 times to the initial volume then pressure P\' is equal to (Initial pressure = P)

A
P' = P

B
P' = 2P

C
P' = P × (2)^15/2

D
P' = 7P

Solution
Question 5
4 / -1

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio C_P / C_v for the gas is

A

B

C
2

D

Solution
Question 6
4 / -1

One mole of an ideal gas at an initial temperature of T K does 6 R J of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be

A
(T + 2.4) K

B
(T – 2.4) K

C
(T + 4) K

D
(T – 4) K

Solution
Question 7
4 / -1

We consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true?

A
ΔU = – sw W in an adiabatic process

B
ΔU = sw in an isothermal process

C
ΔU = – sw in an isothermal process

D
ΔU = sw in an adiabatic process
Question 8
4 / -1

When heat in given to a gas in an isobaric process, then

A
The work is done by the gas

B
Internal energy of the gas increases

C
Both (1) and (2)

D
None from (1) and (2)
Question 9
4 / -1

In thermodynamic processes which of the following statements is not true?

A
In an adiabatic process the system is insulated from the surroundings

B
In an isochoric process pressure remains constant

C
In an isothermal process the temperature remains constant

D
In an adiabatic process PV^γ = constant
Question 10
4 / -1

Unit mass of a liquid with volume V₁ is completely changed into a gas of volume V₂ at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is

A
Zero

B
P(V₂ – V₁)

C
LP(V₂ – V₁)

D
L

Solution