Average energy stored in a pure inductance L when a current i flows through it, is
|
(a) |
(b) |
(c) |
(d) |
Average energy stored in a pure inductance L when a current i flows through it, is
|
(a) |
(b) |
(c) |
(d) |
(d)
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An arbitrary shaped closed coil is made of a wire of length L and a current I ampere is flowing in it. If the plane of the coil is perpendicular to magnetic field
, the force on the coil is
|
(a) Zero |
(b) IBL |
(c) 2IBL |
(d) |
If scattering particles are 56 for 90° angle then this will be at 60° angle
|
(a) 224 |
(b) 256 |
(c) 98 |
(d) 108 |
In the nth orbit, the energy of an electron
for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be
|
(a) 10.2 eV |
(b) 12.1 eV |
(c) 13.6 eV |
(d) 3.4 eV |
The wavelength Ka X-rays produced by an X-ray tube is 0.76 Å. The atomic number of anticathode material is
|
(a) 82 |
(b) 41 |
(c) 20 |
(d) 10 |
The line joining the pole and the centre of curvature of a mirror is called the:
Two vertical plane mirrors are inclined at an angle of 60° with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is
| (a) 60° | (b) 120° | (c) 180° | (d) 240° |
When a resistance of 2ohm is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is
|
(a) 0.5 ohm |
(b) 1.0 ohm |
(c) 1.5 ohm |
(d) 2.0 ohm |
A table tennis ball which has been covered with conducting paint is suspended by a silk thread so that it hang between two plates, out of which one is earthed and other is connected to a high voltage generator. This ball
|
(a) Is attracted towards high voltage plate and stays there |
|
(b) Hangs without moving |
|
(c) Swing backward and forward hitting each plate in turn |
|
(d) Is attracted to earthed plate and stays there |