
- AThe magnet is pushed into the coil
- BThe magnet is rotated into the coil
- CThe magnet is stationary at the centre of the coil.
- DThe number of turns in the coil is reduced.

Explanation:
The deflection in the galvanometer (G) occurs, when the magnet is pushed into the coil. This is because the relative motion between the two induces an emf into the coil.
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If the mass number of an atom is A = 40 and its electron configuration is
, the number of neutrons and protons in its nucleus will be
| (a) 22, 18 | (b) 18, 22 |
(c) 20, 20 |
(d) 18, 18 |
When a charged particle enters a uniform magnetic field its kinetic energy
|
(a) Remains constant |
(b) Increases |
(c) Decreases |
(d) Becomes zero |
A freshly prepared radioactive sample of half- life 1 hour emits radiations that are 128 times as intense as the permissible safe limit. The minimum time after which this sample can be safely used is
|
(a) 14 hours |
(b) 7 hours |
(c) 128 hours |
(d) 256 hours |
Assertion : The cloud in sky generally appear to be whitish.
Reason : Diffraction due to clouds is efficient in equal measure at all wavelengths.
|
(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 eight identical drops are joined to form a bigger drop, the potential on bigger as compared to that on smaller drop will be
|
(a) Double |
(b) Four times |
(c) Eight times |
(d) One time |
If mean wavelength of light radiated by 100 W lamp is 5000 Å, then number of photons radiated per second are
|
(a) 3 |
(b) 2.5 |
(c) 2.5 |
(d) 5 |