- AO2.
- BH2.
- CBoth a and b.
- DNone.
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A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is
| (a) 180 cm | (b) 90 cm | (c) 85 cm | (d) 170 cm |
Magnetic permeability is maximum for
|
(a) Diamagnetic substance |
(b) Paramagnetic substance |
|
(c) Ferromagnetic substance |
(d) All of these |
In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of
| (a) 1 MeV | (b) 0.1 MeV |
(c) 1eV |
(d) 5 eV |
The reason of current flow in P-N junction in forward bias is
|
(a) Drifting of charge carriers |
(b) Minority charge carriers |
|
(c) Diffusion of charge carriers |
(d) All of these |

Total electric flux coming out of a unit positive charge put in air is
|
(a) |
(b) |
(c) |
(d) 4π |