- ADual nature
- BWave nature
- CParticle nature
- DPhoton nature
Explanation:
Electromagnetic radiations have a wave nature as well as properties alike to those of particles. Therefore, electromagnetic radiations are emissions with a dual nature, i.e. it has both wave and particle aspects.
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A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at
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(a) Infinity |
(b) Focus |
|
(c) Pole |
(d) 15 cm behind the mirror |
Which of the following statements is true for an N-type semi-conductor
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(a) The donor level lies closely below the bottom of the conduction band |
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(b) The donor level lies closely above the top of the valence band |
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(c) The donor level lies at the halfway mark of the forbidden energy gap |
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(d) None of above |
Lenz's law is consequence of the law of conservation of
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(a) Charge |
(b) Momentum |
(c) Mass |
(d) Energy |
As a result of interference of two coherent sources of light, energy is
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(a) Increased |
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(b) Redistributed and the distribution does not vary with time |
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(c) Decreased |
|
(d) Redistributed and the distribution changes with time |
Assertion : If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitor becomes 6 times.
Reason : Capacity of the capacitor does not depend upon the nature of the material.
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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. |
The wiring of a house has resistance 6Ω A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly
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(a) Nil |
(b) 23 V |
(c) 32 V |
(d) 12 V |