MCQ
Which of the following are insulators.
- AGlass.
- BPlastic.
- CNylon.
- DAll.
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In the circuit shown below, the cell has an e.m.f. of 10 V and internal resistance of 1 ohm. The other resistances are shown in the figure. The potential difference is
|
(a) 6 V |
(b) 4 V |
(c) 2 V |
(d) -2V |
If a charged spherical conductor of radius 10 cm has potential V at a point distant 5 cm from its centre, then the potential at a point distant 15 cm from the centre will be
|
(a) |
(b) |
(c) |
(d) 3V |
The velocity of light in a medium is half its velocity in air. If ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is
|
(a) 15o |
(b) 30 o |
(c) 45 o |
(d) 60 o |