Maximum useable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 70°. Then x is
|
(a) 150 MHz |
(b) 170 MHz |
(c) 175 MHz |
(d) 190 MHz |
(c) 175 MHz
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Fission of nuclei is possible because the binding energy per nucleon in them
|
(a) Increases with mass number at high mass numbers |
|
(b) Decreases with mass number at high mass numbers |
| (c) Increases with mass number at low mass numbers |
| (d) Decreases with mass number at low mass numbers |
A charge q is placed at the centre of a cube. Then the flux passing through one face of cube will be
|
(a) |
(b) |
(c) |
(d) |
A particle A has charge +q and a particle B has charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speed 
will become
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 1 : 4 |
(d) 4 : 1 |
