- ✓$E=-(\frac{dV}{dr})$
- B$E=-(\frac{dr}{dV})$
- C$E=(\frac{dV}{dr})$
- D$E=(\frac{dr}{dV})$
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Assertion :
from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.
Reason : The energetics b-particles emitted in the decay of
damage the bone marrow.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In an FM system a 7 kHz signal modulates 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is
|
(a) 7.143 |
(b) 8 |
(c) 0.71 |
(d) 350 |


A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum p and energy E, then
| (a) p = 0, E = 0 | (b) p ¹ 0, E ¹ 0 | (c) p ¹ 0, E = 0 | (d) p = 0, E ¹ 0 |
The resistance of a conductor is 5 ohm at 50 oC and 6 ohm at 100 oC. Its resistance at 0 oC is
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(a) 1 ohm |
(b) 2 ohm |
(c) 3 ohm |
(d) 4 ohm |