- Aremains unchanged
- ✓decreases
- Cincreases
- Dfirst decreases and then increases
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A plane mirror produces an image that is:
When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of
|
(a) X-rays |
(b) Radio wave |
(c) Infrared rays |
(d) Green house effect |
A combination of two thin lenses of the same material with focal lengths and
, arranged on a common axis minimizes chromatic aberration, if the distance between them is
|
(a) |
(b) |
(c) ( |
(d) |
The essential distinction between X-rays and γ - rays is that
| (a) γ- rays have smaller wavelength than X-rays |
|
(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom |
| (c) γ- rays have greater ionizing power than X-rays |
| (d) γ- rays are more penetrating than X-rays |
An electron is accelerated through a p.d. of 45.5 volt. The velocity acquired by it is (in ms-1)
|
(a) 4 |
(b) 4 |
(c) |
(d) Zero |
Unit of magnetic permeability is
|
(a) Amp/metre |
(b) Amp/ |
(c) Henry |
(d) Henry/metre |
Two capacitors of capacitances 3 μF and 6 μF are charged to a potential of 12 V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other. The potential difference across each will be
|
(a) 6 volt |
(b) 4 volt |
(c) 3 volt |
(d) Zero |