MCQ on Thermodynamics Physics for Students

The temperature of gas contained in a closed vessel increases by 1°C when the pressure of the gas is increased by 1%. The initial temperature of the gas is

1. 100°C

2. 100K

3. 250°C

4. 200K

Option 2 – 100K

At what temperature is the root mean square velocity of gaseous hydrogen molecules equal to that of oxygen molecules at 47°C

1.80 K

2. 20°K

3. 20°C

4. None

Option 2 – 20°K

At a given temperature the force between molecules of a gas is a function of intermolecular distance is

1. initially decrease then increase

2. increase always

3. decrease always

4. None

Option 1 – initially decrease then increase

Two cylinders fitted with pistons contain an equal amount of an ideal diatomic gas at 300K. The piston of A is free to move while B is held fixed. The same amount of heat is given to the gas in each cylinder, if the rise in temperature of the gas in A is 30K then the rise in temperature of the gas in B is

1. 42K

2. 18K

3. 30K

4. 50K

Option 1 – 42K

Thermo dynamics first law is a special case of

1. Charle’s Law

2. Law of conservation of energy

3. Newton’s Law

4. Law of heat exchange

Option 2 – Law of conservation of energy

A gas has pressure P and volume V. It is now compressed adiabatically to 1/32 times the original volume. The final pressure is

1. 32P

2. 128

3. 128P

4. P/128

Option 3 – 128P

In isothermal expansion, an ideal gas internal energy will be

1. decrease

2. increase

3. No change

4. first in creases then decrease

Option 3 – No change

In an adiabatic change process, an ideal gas work done depends only on

1. Change in temperature

2. Change in pressure

3. Change in volume

4. None

Option 1 – Change in temperature

100grm of ice at 0°C is mixed with 100grm of water at 80°C. The latent heat of fusion is 540 Cal/grm and the specific heat of water is 1Cal/grm at 0’C. The final temperature of the mixture is

1. 40°C

2. 10°C

3. 20°C

4. 0°C

Option 4 – 0°C

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