In Young's double slit experiment, the intensity on the screen at a point where path difference is l is K. What will be the intensity at the point where path difference is λ/4
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(a) |
(b) |
(c) K |
(d) Zero |
(b) 
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Assertion : In meter bridge experiment, a high resistance is always connected in series with a galvanometer.
Reason : As resistance increases current through the circuit increases.
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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. |
A metallic ring is attached with the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be
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(a) First clockwise then anticlockwise |
(b) In clockwise direction |
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(c) In anticlockwise direction |
(d) First anticlockwise then clockwise |
Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be
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(a) Positively charged |
(b) Negatively charged |
(c) Neutral |
(d) Made of metal |
A transformer has turn ratio 100/1. If secondary coil has 4 amp current then current in primary coil is
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(a) 4 A |
(b) 0.04 A |
(c) 0.4 A |
(d) 400 A |
The attenuation in optical fibre is mainly due to
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(a) Absorption |
(b) Scattering |
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(c) Neither absorption nor scattering |
(d) Both (a) and (b) |
Assertion : The energy of charged particle moving in a uniform magnetic field does not change.
Reason : Work done by magnetic field on the charge is zero.
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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. |
