- Is plane.
- Is convex.
- Is concave.
- May be any spherical mirror.


Explanation:

Here initially A & B is parallel to each other after reflection by teh plane mirror A' & B' goes Parallel to each other.
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In a mean life of a radioactive sample
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(a) About 1/3 of substance disintegrates |
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(b) About 2/3 of the substance disintegrates |
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(c) About 90% of the substance disintegrates |
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(d) Almost all the substance disintegrates |
Assertion : The positively charged nucleus of an atom has a radius of almost .
Reason : In a-particle scattering experiment, the distance of closest approach for a-particles is
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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. |
Kirchoff’s I law and II law of current, proves the
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(a) Conservation of charge and energy |
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(b) Conservation of current and energy |
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(c) Conservation of mass and charge |
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(d) None of these |
A cube of side l is placed in a uniform field E, where E = E. The net electric flux through the cube is
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(a) Zero |
(b) |
(c) 4 |
(d) 6 |
When a magnet is pushed in and out of a circular coil C connected to a very sensitive galvanometer G as shown in the adjoining diagram with a frequency v, then

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(a) Constant deflection is observed in the galvanometer |
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(b) Visible small oscillations will be observed in the galvanometer if v is about 50 Hz |
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(c) Oscillations in the deflection will be observed clearly if v = 1 or 2 Hz |
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(d) No variation in the deflection will be seen if v = 1 or 2 Hz |
In a dc motor, induced e.m.f. will be maximum
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(a) When motor takes maximum speed |
(b) When motor starts rotating |
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(c) When speed of motor increases |
(d) When motor is switched off |
If a glass prism is dipped in water, its dispersive power: