The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is
|
(a) |
(b) |
(c) |
(d) |
(a) 
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The potential at a point due to an electric dipole will be maximum and minimum when the angles between the axis of the dipole and the line joining the point to the dipole are respectively
|
(a) 90° and 180 ° |
(b) 0° and 90° |
(c) 90 ° and 0° |
(d) 0° and 180° |
A semiconductor is cooled from 
to 
Its resistance
|
(a) Will decrease |
|
(b) Will increase |
|
(c) Will first decrease and then increase |
|
(d) Will not change |
An unknown resistance R1 is connected in series with a resistance of 10 W. This combinations is connected to one gap of a metre bridge while a resistance R2 is connected in the other gap. The balance point is at 50 cm. Now, when the 10 W resistance is removed the balance point shifts to 40 cm. The value of R1 is (in ohm)
|
(a) 60 |
(b) 40 |
(c) 20 |
(d) 10 |
A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in
|
(a) 256 year |
(b) 128 year |
(c) 64 year |
(d) 24 year |
The magnetic flux through a circuit of resistance R changes by an amount ∆∅ in time ∆t, Then the total quantity of electric charge Q, which passing during this time through any point of the circuit is given by
|
(a) Q = |
(b) Q = |
(c) Q = |
(d) Q = |
A proton, a deuteron and an α - particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If 
and 
denote respectively the radii of the trajectories of these particles, then
|
(a) |
(b) |
(c) |
(d) |
