2μF capacitance has potential difference across its two terminals 200 volts. It is disconnected with battery and then another uncharged capacitance is connected in parallel to it, then P.D. becomes 20 volts. Then the capacity of another capacitance will be
|
(a) 2 μF |
(b) 4 μF |
(c) 18 μF |
(d) 10 μF |
(c) 18 μF
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20 μA current flows for 30 seconds in a wire, transfer of charge will be
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) 8 |
If a transparent medium of refractive index m = 1.5 and thickness t = 2.5 × 10–5 m is inserted in front of one of the slits of Young’s Double Slit experiment, how much will be the shift in the interference pattern? The distance between the slits is 0.5 mm and that between slits and screen is 100 cm
|
(a) 5 cm |
(b) 2.5 cm |
(c) 0.25 cm |
(d) 0.1 cm |
A simple pendulum with bob of mass m and conducting wire of length L swings under gravity through an angle 2θ. The earth’s magnetic field component in the direction perpendicular to swing is B. Maximum potential difference induced across the pendulum is
|
(a) 2BL sin |
(b) BL sin |
|
(c) BL sin |
(d) 2BL sin |
The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens:
Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact convex. The effective power of the combination is
|
(a) 45 dioptres |
(b) 9 dioptres |
(c) 1/9 dioptre |
(d) 6 dioptres |
A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is
|
(a) 45° |
(b) 39° |
(c) 20° |
(d) 30° |
A particle is moving in a uniform magnetic field, then
|
(a) Its momentum changes but total energy remains the same |
|
(b) Both momentum and total energy remain the same |
|
(c) Both will change |
|
(d) Total energy changes but momentum remains the same |
A certain charge liberates 0.8 gm of 
. The same charge will liberate how many gm of silver
|
(a) 108 gm |
(b) 10.8 gm |
(c) 0.8 gm |
(d) |
In a hydrogen atom, an electron moves in a circular orbit of radius 5.2 
and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given 
|
(a) 6.53 |
(b) 13.25 |
|
(c) 9.6 |
(d) 1.04 |
