MCQ
The electric field lines are crowded where electric field is:
- AStrong.
- BWeak.
- CModerate.
- DNone.
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The half life of radioactive Radon is 3.8 days. The time at the end of which 1/20 th of the Radon sample will remain undecayed is (Given ![]()
|
(a) 3.8 days |
(b) 16.5 days |
(c) 33 days |
(d) 76 days |
Two charges and
are placed in vacuum at a distance d and the force acting between them is F. If a medium of dielectric constant 4 is introduced around them, the force now will be
|
(a) 4F |
(b) 2F |
(c) |
(d) |
The average number of prompt neutrons produced per fission of
is
|
(a) More than 5 |
(b) 3 to 5 |
(c) 2 to 3 |
(d) 1 to 2 |
The wavelength of light emitted from second orbit to first orbits in a hydrogen atom is
|
(a) 1.215 |
(b) 1.215 |
(c) 1.215 |
(d) 1.215 |