The current inside a copper voltameter
|
(a) Is half the outside value |
(b) Is the same as the outside value |
|
(c) Is twice the outside value |
(d) Depends on the concentration of |
(b) Is the same as the outside value
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A light of wavelength 5890 Å falls normally on a thin air film. The minimum thickness of the film such that the film appears dark in reflected light
|
(a) 2.945 |
(b) 3.945 |
(c) 4.95 |
(d) 1.945 |
What will be the resultant magnetic field at origin due to four infinite length wires. If each wire produces magnetic field 'B' at origin
|
(a) 4 B |
(b) |
(c) 2 |
(d) Zero |
A coil of area 80 square cm and 50 turns is rotating with 2000 revolutions per minute about an axis perpendicular to a magnetic field of 0.05 Tesla. The maximum value of the e.m.f. developed in it is
|
(a) 200π volt |
(b) |
(c) |
(d) |
In Young’s experiment, monochromatic light is used to illuminate the two slits A and B. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of the beam coming from the slit
|
(a) The fringes will disappear |
|
(b) The fringe width will increase |
|
(c) The fringe width will increase |
|
(d) There will be no change in the fringe width but the pattern shifts |
A charge Q is divided into two parts of q and Q - q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of 
should be
|
(a) 2 |
(b) 1/2 |
(c) 4 |
(d) 1/4 |
The equivalent resistance of the circuit shown in the figure is
|
(a) 8 W |
(b) 6 W |
(c) 5 W |
(d) 4 W |
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
|
(a) First clockwise then anticlockwise |
(b) In clockwise direction |
|
(c) In anticlockwise direction |
(d) First anticlockwise then clockwise |
