- AImpurity semiconductor is called extrinsic semiconductor.
- BBoth hole and electron are charge carriers.
- CElectrons are minority charge carriers in P-type semiconductor.
- ✓Holes in P-type semiconductor are minority charge carriers.
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Two condensers
and
in a circuit are joined as shown in figure. The potential of point A is
and that of B is
. The potential of point D will be

|
(a) |
(b) |
(c) |
(d) |
In the absence of other conductors, the surface charge density
|
(a) Is proportional to the charge on the conductor and its surface area |
|
(b) Inversely proportional to the charge and directly proportional to the surface area |
|
(c) Directly proportional to the charge and inversely proportional to the surface area |
|
(d) Inversely proportional to the charge and the surface area |
The amplification factor of a triode valve is 15. If the grid voltage is changed by 0.3 volt the change in plate voltage in order to keep the plate current constant (in volt) is
|
(a) 0.02 |
(b) 0.002 |
(c) 4.5 |
(d) 5.0 |
In a negative logic the following wave form corresponds to the

|
(a) 0000000000 |
(b) 0101101000 |
(c) 1111111111 |
(d) 1010010111 |
Statement-2: NOT gate inverts the input order.
The core of a transformer is laminated so that
|
(a) Ratio of voltage in the primary and secondary may be increased |
|
(b) Rusting of the core may be stopped |
|
(c) Energy losses due to eddy currents may be reduced |
|
(d) Change in flux is increased |