- ✓its stability
- Bits size
- Cits mass
- Dnone of these
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At any instant the ratio of the amount of radioactive substances is 2 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 1 : 2 |
(d) 1 : 4 |
Two small spheres each having the charge +Q are suspended by insulating threads of length L from a hook. This arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will be
|
(a) 180°, |
(b) 90°, |
(c) 180°, |
(d) 180°, |
In a transistor configuration b-parameter is
|
(a) |
(b) |
(c) |
(d) |
The current in a coil decreases from 1 A to 0.2 A. In 10sec. Calculate the coefficient of self inductance. If induced emf is 0.4 volt.
|
(a) 5 H |
(b) 3 H |
(c) 4 H |
(d) 2 H |
A nucleus decays by
emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.
|
(a) Z - 1 and A - 1 |
(b) Z + 1 and A |
(c) Z - 1 and A |
(d) Z + 1 and A - 1 |