Metallic solids are always opaque because
|
(a) Solids effect the incident light |
|
(b) Incident light is readily absorbed by the free electron in a metal |
|
(c) Incident light is scattered by solid molecules |
|
(d) Energy band traps the incident light |
(b) Incident light is readily absorbed by the free electron in a metal
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A magnet is dropped down an infinitely long vertical copper tube
|
(a) The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity |
|
(b) The magnet moves with continuously decreasing velocity and ultimately comes to rest |
|
(c) The magnet moves with continuously increasing velocity but constant acceleration |
|
(d) The magnet moves with continuously increasing velocity and acceleration |
A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point p a distance 
from the centre of the shell is
|
(a) |
(b) |
(c) |
(d) |
The counting rate observed from a radioactive source at t = 0 second was 1600 counts per second and at t = 8 seconds it was 100 counts per second. The counting rate observed, as counts per second at t = 6 seconds, will be
|
(a) 400 |
(b) 300 |
(c) 200 |
(d) 150 |
The equivalent resistance between the points P and Q of the circuit given is
|
(a) |
(b) |
(c) 4 R |
(d) 2 R |
Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular to its axis as shown then time period for each part will be
| (a) 4T | (b) T/4 | (c) T/2 | (d) T |
