Physics – Class 11 Practice Test 8

1. If 5g of a solid requires 30cal of heat to change into liquid at the same temperature, calculate the latent heat of fusion in cal/g.

0.167

150

2. C_P > C_V always. True or False?

True

False

3. When water is kept in a very hot pan, the entire water heats up. Which mode of heat transfer is responsible for this?

Convection along with radiation

Conduction

Convection

Radiation

4. Condensation temperature is the same as evaporation temperature. True or False?

True

False

5. What is the definition of 1 calorie?

It is the heat required to raise the temperature of 1g of any substance by 14.5°C to 15.5°C at 760mm Hg

It is the heat required to raise the temperature of 1g of water from 14.5°C to 15.5°C at 760mm Hg

It corresponds to the heat supplied at 760mm Hg for 1°C raise in temperature

It is the heat required to raise temperature of 1g of water by 1°C at 760mm Hg

6. On which of these following options is the continuity equation based?

Work energy theorem

Conservation of mass

Law of conservation of energy

Conservation of momentum

7. Change of phase occurs at a constant temperature, which implies that even on addition of heat to a substance temperature remains constant. True or False?

False

True

8. A uniform metal sheet has a hole in its centre. What happens to hole when the sheet is uniformly heated?

Its size decreases

It changes shape

Its size increases

Remains the same size

9. Consider two points, A & B, on two different streamlines. Bernoulli Theorem can be applied between points A & B.

False

True

10. What should be the temperature of 1g of ice, so that when it’s added to 9g of water, lowers the temperature of water by 10°C? S_w = 1cal/ g°C, S_ice = 0.5cal/ g°C, L_fus= 80cal/g.

20°C

0°C

-20°C

10°C