MCQ
Relation between current I flowing in moving coil galyanometer and deflection $\theta$ is :
- A$I \propto \tan \theta$
- ✓$I \propto \theta$
- C$I=\frac{1}{\theta}$
- D$1 \propto \cot \theta$
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The net resistance of a voltmeter should be large to ensure that
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(a) It does not get overheated |
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(b) It does not draw excessive current |
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(c) It can measure large potential difference |
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(d) It does not appreciably change the potential difference to be measured |
To an observer on the earth the stars appear to twinkle. This can be ascribed to
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(a) The fact that stars do not emit light continuously |
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(b) Frequent absorption of star light by their own atmosphere |
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(c) Frequent absorption of star light by the earth's atmosphere |
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(d) The refractive index fluctuations in the earth's atmosphere |
If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then
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(a) Current flows through the copper ring |
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(b) Voltage in the magnet increase |
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(c) Current flows in the magnet |
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(d) Copper ring will get magnetised |
If an electric current is passed through a nerve of a man, then man
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(a) Begins to laugh |
(b) Begins to weep |
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(c) Is excited |
(d) Becomes insensitive to pain |