# Heat and Thermodynamics

1. The Sun is a major source of:

a. Light

b. Energy

c. Power

d. Heat

2. Heat is a form of:

a. Light

b. Power

c. Energy

d. Temperature

3. Heat from the Sun reaches Earth by:

a. Conduction

c. Convection

d. Vaporization

4. When the air in a car tyre becomes hot, it expands causing the pressure it exerts to:

a. Increase

b. Decrease

c. Contract

d. Expand

5. A sea breeze occurs during the day when the air over the land is _________than the air over the sea.

a. Lighter

b. Hotter

c. Cooler

d. Heavier

6. There are 100 Celsius degrees between the freezing point of water and the _______ point of water.

a. Heating

b. Boiling

c. Cooling

d. Evaporating

7. Heat energy is because of the movement of:

a. Atoms

b. Particles

c. Molecules

d. Electricity

8. Heat is transmitted through solids by a process called:

b. Convection

c. Diffusion

d. Conduction

9. On heating, solids expand in all:

a. Spaces

b. Directions

c. Parts

d. None of these

10. A thermometer is the Instrument used for measuring:

a. Heat

b. Energy

c. Temperature

d. Length

11. on heating, the kinetic energy of molecules:

a. Increases

b. Decreases

c. Remains constant

d. May increase or decrease

12. Ice point on Celsius Scale is taken as:

a. 32 degrees

b. Zero degree

c. 100 degrees

d. 212 degrees

13. The boiling point of water on Centigrade Scale is:

a. 212°C

b. 100°C

c. 1500C

d. 90°C

14. Melting point of ice on Fahrenheit Scale is taken as:

a. Zero degree

b. 32 degrees

c. 212 degrees

d. 12 degrees

15. Mercury is a good thermometric material because:

a. It is opaque

b. It is shining

c. Its thermal expansion inconstant

d. It is transparent

16. The normal temperature of a healthy person’s body is about:

a. 97.4° F

b. 98.6° F

c. 96.4° F

d. 98.4° F

a. Conduction

b. Convection

d. All of these

18. Heat and temperature are

a. The same thing

b. Not the same thing

c. The new thing

d. None of those

19. Different object expand at:

a. Different rates

b. Same rates

c. Noon

d. Night

20. Temperature of human body is measured by:

a. Fahrenheit thermometer

b. Clinical thermometer

c. Minimum

d. Maximum thermometer

21. liquids expand _____— than solids.

a. Less

b. Better

c. More

d. None of these a better

22. A black surface is a better ______ and absorber of heat than a white surface.

a. Reflector

b. Conductor

c. Evaporator

23. All metals are good:

a. Conductors

b. Absorbers

d. Insulators

24. Substances which do not allow heat to pass through them are called:

a. Conductors

b. Insulators

c. Absorbers