- AAny closed surface.
- BFor particular surfaces
- CBoth a and b.
- DNone.
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The percentage of Sun's total energy which reaches the earth's surface is
|
(a) 10–7 % |
(b) 10–6 % |
(c) 10–3 % |
(d) 10–2 % |

If energy of K-shell electron is – 40000 eV and If 60000 V potential is applied at coolidge tube then which of the following X-ray will get form
|
(a) Continuous |
|
(b) White X-rays |
|
(c) Continuous and all series of characteristic |
|
(d) None of these |
The large scale destruction, that would be caused due to the use of nuclear weapons is called
|
(a) Nuclear holocaust |
(b) Thermo-nuclear reaction |
|
(c) Nuetron reproduction factor |
(d) None of these |
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5º and the prism is made of a material of refractive index 1.5, the angle of incidence is:
Two charges are at a distance ‘d’ apart. If a copper plate (conducting medium) of thickness
is placed between them, the effective force will be
|
(a) 2F |
(b) F / 2 |
(c) 0 |
(d) |