Two different loops are concentric and lie in the same plane. The current in the outer loop is clockwise and increasing with time. The induced current in the inner loop then, is
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(a) Clockwise |
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(b) Zero |
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(c) Counter clockwise |
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(d) In a direction that depends on the ratio of the loop radii |
(c) Counter clockwise
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The diagram shows-the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy
| (a) I | (b) II | (c) III | (d) IV |
A milliammeter of range 10 mA has a coil of resistance 1 W. To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be
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(a) 999 W |
(b) 99 W |
(c) 1000 W |
(d) None of these |
Doping of intrinsic semiconductor is done
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(a) To neutralize charge carriers |
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(b) To increase the concentration of majority charge carriers |
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(c) To make it neutral before disposal |
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(d) To carry out further purification |
The speed of electromagnetic wave in vacuum depends upon the source of radiation
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(a) Increases as we move from g-rays to radio waves |
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(b) Decreases as we move from g-rays to radio waves |
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(c) Is same for all of them |
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(d) None of these |
Assertion : In photoelectric effect, on increasing the intensity of light, both the number of electrons emitted and kinetic energy of each of them get increased but photoelectric current remains unchanged.
Reason : The photoelectric current depends only on wavelength of light.
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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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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(d) If the assertion and reason both are false. |
Evidence for the wave nature of light cannot be obtained from
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(a) Reflection |
(b) Doppler effect |
(c) Interference |
(d) Diffraction |