- ABy an electric field.
- BBy a magnetic field.
- CBy an electric field as well aa by a magnetic field.
- DNeither by an electric field nor by a magnetic field.
Explanation:
Since X-rays do not have any charged particles, they are not deflected by an electric field or a magnetic field.
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If the energy released in the fission of one nucleus is 200 MeV. Then the number of nuclei required per second in a power plant of 16 kW will be
|
(a) 0.5 |
(b) 0.5 |
(c) 5 |
(d) 5 |
In a sample of radioactive material, what fraction of the initial number of active nuclei will remain undisintegrated after half of a half-life of the sample
|
(a) |
(b) |
(c) |
(d) 2 |
When the convergent nature of a convex lens will be less as compared with air
|
(a) In water |
(b) In oil |
(c) In both (a) and (b) |
(d) None of these |
If an electron jumps from 1st orbital to 3rd orbital, then it will
|
(a) Absorb energy |
(b) Release energy |
|
(c) No gain of energy |
(d) None of these |
According to Mosley's law, the frequency of a spectral line in X-ray spectrum varies as
|
(a) Atomic number of the element |
| (b) Square of the atomic number of the element |
| (c) Square root of the atomic number of the element |
|
(d) Fourth power of the atomic number of the element |

A ferromagnetic material is heated above its curie temperature. Which one is a correct statement
| (a) Ferromagnetic domains are perfectly arranged |
| (b) Ferromagnetic domains becomes random |
| (c) Ferromagnetic domains are not influenced |
| (d) Ferromagnetic material changes itself into diamagnetic material |
The phenomenon of radioactivity is
|
(a) Exothermic change which increases or decreases with temperature |
|
(b) Increases on applied pressure |
|
(c) Nuclear process does not depend on external factors |
|
(d) None of the above |
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) |