MCQ
The ratio of electric force between two electrons to two protons separated by the same distance in air is:
- A100
- B106
- C104
- DNone of these
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For the structural analysis of crystals, X-rays are used because
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(a) X-rays have wavelength of the order of interatomic spacing |
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(b) X-rays are highly penetrating radiations |
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(c) Wavelength of X-rays is of the order of nuclear size |
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(d) X-rays are coherent radiations |
2μF capacitance has potential difference across its two terminals 200 volts. It is disconnected with battery and then another uncharged capacitance is connected in parallel to it, then P.D. becomes 20 volts. Then the capacity of another capacitance will be
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(a) 2 μF |
(b) 4 μF |
(c) 18 μF |
(d) 10 μF |
A galvanometer can be used as a voltmeter by connecting a
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(a) High resistance in series |
(b) Low resistance in series |
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(c) High resistance in parallel |
(d) Low resistance in parallel |