| 1 |
Convection of heat is the process of heat transfer due to the: |
- A. Random motion of molecules
- B. Downward movement of molecules
- C. Upward movement of molecules
- D. Free movement of molecules
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| 2 |
The amount of heat absorb by body depends on the : |
- A. Colour of the surface
- B. Nature of surface
- C. Texture of surface
- D. Both A and B
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| 3 |
Which of the following is an insulator? |
- A. Wood
- B. Glass
- C. Plastic
- D. Steel
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| 4 |
Metals are good conductor of heat due to |
- A. Free Electrons
- B. Big size of their molecules
- C. Small size of their molecules
- D. Rapid vibrations of their atoms
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| 5 |
Coloured surface is a |
- A. Best emitter
- B. Good emitter
- C. Bad emitter
- D. Wrost emitter
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| 6 |
The main source of energy n the universe is: |
- A. Moon
- B. Stars
- C. Sun
- D. Planets
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| 7 |
A silvery white surface is a : |
- A. Worst reflector
- B. Best reflector
- C. Worst absorber
- D. Best absorber
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| 8 |
Larger number of slots are made in radiators to increase: |
- A. Surface temperature
- B. Surface area
- C. Both A and B
- D. Nonr
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| 9 |
The rate at which various surface absorb heat depends upon: |
- A. Nature of surface
- B. Nature of liquid
- C. Radiation
- D. Emission & absorption
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| 10 |
Thermal conductivity of iron is Wm<sup>-1</sup> K<sup>-1</sup> |
|