- ✓Gamma rays
- BX-rays
- CRadio waves
- DMicro waves
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Assertion : When a tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the centre of shadow of the obstacle.
Reason : Destructive interference occurs at the centre of the shadow.
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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 coil of N turns and mean cross-sectional area A is rotating with uniform angular velocity w about an axis at right angle to uniform magnetic field B. The induced e.m.f. E in the coil will be
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(a) NBA sinwt |
(b) NB w sinwt |
(c) NB/A sinwt |
(d) NBA w sinwt |
The ratio of real depth to apparent depth is called the the:
A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by
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(a) 1.05 |
(b) 3.16 |
(c) 2.11 |
(d) 4.22 |
An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be

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(a) |
(b) |
(c) Zero |
(d) Infinite |
An uncharged capacitor is connected to a battery. On charging the capacitor
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(a) All the energy supplied is stored in the capacitor |
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(b) Half the energy supplied is stored in the capacitor |
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(c) The energy stored depends upon the capacity of the capacitor only |
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(d) The energy stored depends upon the time for which the capacitor is charged |
A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light: