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