- ARelaxation time increases
- BMass of the electron increases
- ✓Relaxation time decreases
- DMass of the electron decreases
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To obtain electrons as majority charge carriers in a semiconductor, the impurity mixed is
|
(a) Monovalent |
(b) Divalent |
(c) Trivalent |
(d) Pentavalent |
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 |
A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement(s) from the following
|
(a) The entire rod is at the same electric potential |
|
(b) There is an electric field in the rod |
|
(c) The electric potential is highest at the centre of the rod and decreases towards its ends |
|
(d) The electric potential is lowest at the centre of the rod and increases towards its ends |
When
is bombarded with one neutron, the fission occurs and the products are three neutrons,
and
|
(a) |
(b) |
(c) |
(d) |
In the circuit shown below E1 = 4.0 V, R1 = 2 W, E2 = 6.0 V, R2 = 4 W and R3 = 2 W. The current I1 is
|
(a) 1.6 A |
(b) 1.8 A |
(c) 1.25 A |
(d) 1.0 A |
An electric dipole of moment placed in a uniform electric field
has minimum potential energy when the angle between
and
is
|
(a) Zero |
(b) |
(c) π |
(d) |
Which can pass through 20 cm thickness of the steel
|
(a) α - particles |
(b) β - particles |
(c) γ- rays |
(d) Ultraviolet rays |