A current carrying long solenoid is placed on the ground with its axis vertical. A proton is falling along the axis of the solenoid with a velocity v. When the proton enters into the solenoid, it will
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(a) Be deflected from its path |
|
(b) Be accelerated along the same path |
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(c) Be decelerated along the same path |
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(d) Move along the same path with no change in velocity |
(d) Move along the same path with no change in velocity
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The number of turns in primary and secondary coils of a transformer are 100 and 20 respectively. If an alternating potential of 200 volt is applied to the primary, the induced potential in secondary will be
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(a) 10 V |
(b) 40 V |
(c) 1000 V |
(d) 20,000 V |
The current in a coil decreases from 1 A to 0.2 A. In 10sec. Calculate the coefficient of self inductance. If induced emf is 0.4 volt.
|
(a) 5 H |
(b) 3 H |
(c) 4 H |
(d) 2 H |
When light is incident on a diffraction grating the zero order principal maximum will be
|
(a) One of the component colours |
(b) Absent |
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(c) Spectrum of the colours |
(d) White |
The shift by which object appears to be raised ....... with the increase in the thickness of the denser medium.
In the depletion region of an unbiased P-N junction diode there are
| (a) Only electrons | (b) Only holes |
| (c) Both electrons and holes | (d) Only fixed ions |
A magnet of magnetic moment M oscillating freely in earth's horizontal magnetic field makes n oscillations per minute. If the magnetic moment is quadrupled and the earth's field is doubled, the number of oscillations made per minute would be
(a) 
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(b) 
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(c) 2
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(d)
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The true statement for thermo e.m.f. of a thermocouple
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(a) Depends on the nature of metals |
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(b) Depends only on temperature of cold junction |
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(c) Depends only on temperature of hot junction |
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(d) Depends on the length of the wires used for thermocouple |