- ✓zero
- B$\pi / 2$
- C$\pi$
- D$3 \pi / 2$
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Ohm's law is true
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(a) For metallic conductors at low temperature |
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(b) For metallic conductors at high temperature |
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(c) For electrolytes when current passes through them |
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(d) For diode when current flows |
The wavelength of X-rays decreases, when
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(a) Temperature of target is increased |
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(b) Intensity of electron beam is increased |
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(c) K.E. of electrons striking the target is increased |
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(d) K.E. of electrons striking the target is decreased |
Approximate height of ozone layer above the ground is
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(a) 60 to 70 km |
(b) 59 km to 80 km |
(c) 70 km to 100 km |
(d) 100 km to 200 km |
The magnetic susceptibility does not depend upon the temperature in
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(a) Ferrite substances |
(b) Ferromagnetic substances |
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(c) Diamagnetic substances |
(d) Paramagnetic substances |
Masses of three wires of copper are in the ratio of 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are
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(a) 1 : 3 : 5 |
(b) 5 : 3 : 1 |
(c) 1 : 15 : 125 |
(d) 125 : 15 : 1 |