A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
(a) Room temperature
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In an electric heater 4 amp current passes for 1 minute at potential difference of 250 volt, the power of heater and energy consumed will be respectively
|
(a) 1 kW, 60 kJ |
(b) 0.5 kW, 30 kJ |
(c) 10 kW, 600 kJ |
(d) None of these |
If and
are the electric and magnetic field vectors of E.M. waves then the direction of propagation of E.M. wave is along the direction of
|
(a) |
(b) |
(c) |
(d) None of these |
A PN- junction has a thickness of the order of
| (a) 1 cm | (b) 1 mm |
(c) |
(d) |
An ellipsometer is an instrument for.
One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then
|
(a) Mass of A and mass of B still remain equal |
|
(b) Mass of A increases |
|
(c) Mass of B decreases |
|
(d) Mass of B increases |
The magnetic moment of atomic neon is
| (a) Zero | (b) μB/2 | (c) μB | (d) 3μB/2 |
In the given circuit, with steady current, the potential drop across the capacitor must be

|
(a) V |
(b) V / 2 |
(c) V / 3 |
(d) 2V / 3 |