A long horizontal metallic rod with length along the east-west direction is falling under gravity. The potential difference between its two ends will
|
(a) Be zero |
(b) Be constant |
(c) Increase with time |
(d) Decrease with time |
(c) Increase with time
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Chromatic aberration of lens can be corrected by
|
(a) Reducing its aperature |
|
(b) Proper polishing of its two surfaces |
|
(c) Suitably combining it with another lens |
|
(d) Providing different suitable curvature to its two surfaces |
$\frac{1}{2}\text{mgR}$
$2\text{mgR}$
$\text{mgR}$
$\frac{1}{4}\text{mgR}$
As the temperature of hot junction increases, the thermo e.m.f.
|
(a) Always increases |
(b) Always decreases |
|
(c) May increase or decrease |
(d) Always remains constant |
(USS 133) Indium impurity in germanium makes
|
(a) N-type |
(b) P-type |
(c) Insulator |
(d) Intrinsic |
The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2>W1). If the current before and after change are I1 and I2, all other conditions remaining unchanged, then (assuming hn > W2)
|
(a) |
(b) |
(c) |
(d) |
Electric power is transmitted over long distances through conducting wires at high voltage because
|
(a) High voltage travels faster |
|
(b) Power loss is large |
|
(c) Power loss is less |
|
(d) Generator produced electrical energy at a very high voltage |
