Thermodynamics Test

Result

Thermodynamics Test - 32

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Weekly Quiz Competition

Question 1
4 / -1

If we consider solar system consisting of the earth and sun only as one of the ideal thermodynamic system. The sun works as source of energy having temperature 6000 K and the earth as sink having temperature 300 K, the efficiency of solar system would be on the basis of exchange of radiations

A
30%

B
65%

C
75%

D
95%

Solution
Question 2
4 / -1

The temperature of sink of Carnot engine is 27° C. Efficiency of engine is 25%. Then temperature of source is

A
227°C

B
327°C

C
127°C

D
27°C

Solution
Question 3
4 / -1

A carnot engine has the same efficiency between 800 K to 500 K and x K to 600 K. The value of x is

A
1000 K

B
960 K

C
846 K

D
754 K

Solution
Question 4
4 / -1

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
Isothermal compression
Question 5
4 / -1

Efficiency of a Carnot engine is 50% when temperature of outlet is 500 K. In order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of outlet?

A
200 K

B
400 K

C
600 K

D
800 K

Solution
Question 6
4 / -1

An ideal refrigerator has a freezer at a temperature of –13°C. The coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) will be

A
325°C

B
325 K

C
39°C

D
320°C

Solution
Question 7
4 / -1

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

A

B

C

D

Solution
Question 8
4 / -1

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%

Solution
Question 9
4 / -1

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

B
3/5

C
3/47

D
3/4

Solution
Question 10
4 / -1

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 (given γ = 3/2)

A
IP

B
2P

C
4P

D
8P

Solution