A parallel plate capacitor carries a charge q. The distance between the plates is doubled by application of a force. The work done by the force is
|
(a) Zero |
(b) |
(c) |
(d) |
(c) 
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For a common base configuration of PNP transistor 
then maximum current gain in common emitter configuration will be
|
(a) 12 |
(b) 24 |
(c) 6 |
(d) 5 |
In Young’s double slit experiment, the central bright fringe can be identified
|
(a) By using white light instead of monochromatic light |
|
(b) As it is narrower than other bright fringes |
|
(c) As it is wider than other bright fringes |
|
(d) As it has a greater intensity than the other bright fringes |
Assertion : When radius of circular loop carrying current is doubled, its magnetic moment becomes four times.
Reason : Magnetic moment depends on area of the loop.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Three glass prisms A, B and C of same refractive index are placed in contact with each other as shown in figure, with no air gap between the prisms. Monochromatic ray of light OP passes through the prism assembly and emerges as QR. The conditions of minimum deviation is satisfied in the prisms
|
(a) A and C |
(b) B and C |
|
(c) A and B |
(d) In all prisms A, B and C |
The resistance of a wire of uniform diameter d and length L is R. The resistance of another wire of the same material but diameter 2d and length 4L will be
|
(a) 2R |
(b) R |
(c) R/2 |
(d) R/4 |
