MCQs QUESTIONS Chapter 8

1. Temperature is equal to of substance.

A. Average K.E. of molecules

B. Individual K.E. of each molecule

C. Average P.E of molecules

D. Individual P.E. of each molecule

2. Boiling point of water is.

A. 212 °C

B. 212 °F

C. 100 K

D.373 °C

3. J/kg K is the unit of:

A. Specific Heat Capacity

B. Heat Capacity

C. Latent Heat of Fusion

D. Heat Energy

4. At temperature, water has maximum density?

A. 0 °C

B. -4 °C

C. -273 K

D. 4°C

5. Evaporation takes place from of liquid.

A. Surface

B. Bottom

C. center

D. any location

6. Number of divisions on Fahrenheit scale between its reference points are:

A. 100

B. 173

C. 212

D. 180

7. By adding heat at melting point, the temperature of substance does not change. Heat added to substance is used to of substance.

A. increase K.E. of particles

B. decrease K.E. of particles

C. increase the attraction between particles

D. decrease the attraction between particles

8. 336 J/g is latent heat of fusion of a material. How much heat is required to melt 10 g of material at its melting point?

A. 336J

B. 3360 J

C. 33600 J

D. 3.36× 1051

9. Substances with their specific heats are given below. Which of the following substances will cool down quickly if heated for same temperature?

A. Water (4200 J/kg K)

B. Wood (1700)/kg K)

C. Copper (400 J/kg K)

D. Silver (250)/kg K)