When the current i is flowing through a conductor, the drift velocity is v. If 2i current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be
|
(a) v/4 |
(b) v/2 |
(c) v |
(d) 4v |
(c) v
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The torque acting on a dipole of moment 
in an electric field 
is
|
(a) |
(b) |
(c) Zero |
(d) |
The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium
| (a) Can easily be broken up | (b) Is very stable |
| (c) Can be used as fissionable material | (d) Is radioactive |
A vertical wire carrying a current in the upward direction is placed in horizontal magnetic field directed towards north. The wire will experience a force directed towards
|
(a) North |
(b) South |
(c) East |
(d) West |
Assertion : The colour of the green flower seen through red glass appears to be dark.
Reason : Red glass transmits only red light.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will be decreased by a fraction
|
(a) 2/3 |
(b) 4/9 |
(c) 3/4 |
(d) 5/9 |
