General Physics Questions And Answers, Set 46

 

General Physics Questions And Answers

Q1. 

Which law of thermodynamics says that efficiency of a heat engine cannot be 1?

Ans.

Second

Q2. 

Which of the following is the Kelvin Planck statement?

Ans.

Efficiency of a heat engine is less than 1

Q3. 

The second law of thermodynamics states that?

Ans. 

Entropy of an isolated system can never decrease over time

Q4. 

Select the correct order of steps in which a working substance(gas) goes through in a refrigerator.

Ans.

Expansion of gas, absorption of heat, heating of vapour, release of heat

Q5. 

Efficiency of a refrigerator can be greater than 1. True or False?

Ans.

False

Q6. 

The variables like pressure, volume, temperature of a thermodynamic system are microscopic. True or False?

Ans.

False

Q7. 

One end of a rod is held in a fire, while the other is held by one’s hand. Just assume his hand doesn’t get burned. After some time the rod-hand system is in thermal equilibrium. True or False?

Ans.

False

Q8. 

How many degrees of freedom are there in a monatomic gas?

Ans.

3

Q9. 

What is the ratio of specific heats for a monatomic gas?

Ans.

5/3

Q10. 

How many degrees of freedom are there in a diatomic gas?

Ans. 

5

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