MCQ
If one penetrates a uniformly charged spherical cloud, electric field strength:
- ADecreases directly as the distance from the centre.
- BIncreases directly as the distance from the centre.
- CRemains constant.
- DNone of these.
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In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be
|
(a) 200 |
(b) 100 |
(c) 50 |
(d) 20 |
The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
|
(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |
The energy of a photon of characteristic X-rays from a Coolidge tube comes from
| (a) The kinetic energy of the striking electron |
| (b) The kinetic energy of the free electrons of the target |
| (c) The kinetic energy of the ions of the target |
| (d) An electronic transition of the target atom |
Between the plates of a parallel plate condenser there is 1mm thick paper of dielectric constant 4. It is charged at 100 volt. The electric field in volt/metre between the plates of the capacitor is
|
(a) 100 |
(b) 100000 |
(c) 25000 |
(d) 4000000 |