MCQ
What type of nature do electromagnetic waves have?
- 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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If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
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(a) Current drop |
(b) Potential drop |
(c) No current drop |
(d) No potential drop |
Assertion : In Hertz experiment, the electric vector of radiation produced by the source gap is parallel to the gap.
Reason : Production of sparks between the detector gap is maximum when it is placed perpendicular to the source gap.
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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. |
Television signals broadcast from the moon can be received on the earth while the TV broadcast from Delhi cannot be received at places about 100 km distant from Delhi. This is because
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(a) There is no atmosphere around the moon |
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(b) Of strong gravity effect on TV signals |
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(c) TV signals travel straight and cannot follow the curvature of the earth |
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(d) There is atmosphere around the earth |
The majority charge carriers in P-type semiconductor are
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(a) Electrons |
(b) Protons |
(c) Holes |
(d) Neutrons |