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There is a current of 1.344 amp in a copper wire whose area of cross-section normal to the length of the wire is 1
. If the number of free electrons per
is 8.4
, then the drift velocity would be
|
(a) 1.0 mm/sec |
(b) 1.0 m/sec |
(c) 0.1 mm/sec |
(d) 0.01 mm/sec |
Einstein got Nobel prize on which of the following works
|
(a) Mass-energy relation |
(b) Special theory of relativity |
|
(c) Photoelectric equation |
(d) (a) and (b) both |
Assertion : The properties of paramagnetic and ferromagnetic substance are not effected by heating.
Reason : As temperature rises, the alignment of molecular magnets gradually decreases.
|
(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 assertion is false but reason is true. |
A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire
|
(a) Will be doubled |
(b) Will be halved |
|
(c) Will remain the same |
(d) Will be quadrupled |
Assertion : A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason : The surface density of charge on the plate remains constant or unchanged.
|
(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. |
Angle between equipotential surface and lines of force is
|
(a) Zero |
(b) 180° |
(c) 90° |
(d) 45° |
If a change in current of 0.01 A in one coil produces a change in magnetic flux of 1.2
in the other coil, then the mutual inductance of the two coils in henries is
|
(a) 0 |
(b) 0.5 |
(c) 1.2 |
(d) 3 |