In an interference experiment, the spacing between successive maxima or minima is (Where the symbols have their usual meanings)
|
(a) |
(b) |
(c) |
(d) |
(b) 
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A proton and an alpha particle are separately projected in a region where a uniform magnetic field exists. Their initial velocities are perpendicular to direction of magnetic field. If both the particles move around magnetic field in circles of equal radii, the ratio of momentum of proton to alpha particle 
is
|
(a) 1 |
(b) |
(c) 2 |
(d) |
A potentiometer is an ideal device of measuring potential difference because
|
(a) It uses a sensitive galvanometer |
|
(b) It does not disturb the potential difference it measures |
|
(c) It is an elaborate arrangement |
|
(d) It has a long wire hence heat developed is quickly radiated |
If the energy of the photon is increased by a factor of 4, then its momentum
|
(a) Does not change |
(b) Decreases by a factor of 4 |
|
(c) Increases by a factor of 4 |
(d) Decreases by a factor of 2 |
When a wave travels from one medium to another, the quantity which will not change is its:
$10\text{cm}$
$10\sqrt{2}\text{cm}$
$\frac{10}{\sqrt{2}}\text{cm}$
A point object is placed at a distance of 30cm from a convex mirror of focal length 30cm. The image will form at:
A cube of side b has a charge q at each of its vertices. The electric field due to this charge distribution at the centre of this cube will be
|
(a) |
(b) |
(c) |
(d) Zero |
