TRB MODEL QUESTIONS FOR PHYSICS
| 21. |
The region covered by water is known as |
| |
- A. hydrosphere
- B. atmosphere
- C. ionosphere
- D. none of these
|
| 22. |
The time taken for one oscillation is called |
| |
- A. mass
- B. second
- C. minute
- D. period oscillation
|
| 23. |
The S.I. unit of time is |
| |
- A. hour
- B. second
- C. minute
- D. day
|
| 24. |
The material which do not conduct electric charges is |
| |
- A. copper
- B. silver
- C. mica
- D. graphite
|
| 25. |
A neutron is a ----- particle. |
| |
- A. positively charged
- B. negatively charged
- C. neutral
- D. positively and negatively charged
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