Physics Questions and Answers
| 9. |
_______ is used as a coolant in nuclear reactors? |
| |
- A. Heavy water
- B. Liquid sodium
- C. Graphite
- D. Cadmium
|
| 10. |
The velocity of sound in air (vacuum) is |
| |
- A. 110 m/sec
- B. 220 m/sec
- C. 232 m/sec
- D. 330 m/sec
|
| 11. |
When X-rays are produced? |
| |
- A. Heat is generated at the target
- B. Brilliant light is seen at the target
- C. Heat is absorbed at the target
- D. The temperature of the target remains constant
|
| 12. |
The velocity of light in vacuum or air is |
| |
- A. 9 x 10 2 m/sec
- B. 3 x 10 11
m/sec
- C. 3 x 10 8 m/sec
- D. 2 x 10 4 m/sec
|
