| 1 |
Transfer of heat by the actual movement of molecules from one place to the other is called  |
- A. conduction
- B. convection
- C. radiation
- D. waves
|
| 2 |
Shining silvered surface is a best: |
- A. Emitter
- B. Absorber
- C. Reflector
- D. None of these
|
| 3 |
The device used to stop conduction, convention and radiation: |
- A. Thermometer
- B. Thermo flask
- C. Both
- D. Nil
|
| 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
|
| 5 |
False celling is done to |
- A. Lower the height of ceiling
- B. Keep the roof clean
- C. cool and room
- D. Insulate the ceiling.
|
| 6 |
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
|
| 7 |
The insulator of heat is: |
- A. Cork
- B. Cotton
- C. Wood
- D. All
|
| 8 |
Land and sea breezes are the result of: |
- A. Absorption
- B. Radiation
- C. Conduction
- D. Convection
|
| 9 |
The mathematical formula of thermal conductivity is |
- A. k =Q/t x L/A (T1 - T2)
- B. k =Q/t x L/A (T1 + T2)
- C. k =t/Q x L/A (T1 - T2)
- D. k =2Q/t x L/A (T1 + T2)
|
| 10 |
Which surface is bad emitter: |
- A. White surface
- B. Black surface
- C. Coloured surface
- D. Silver surface
|