10 wires (same length, same area, same material) are connected in parallel and each has 1 Ω resistance, then the equivalent resistance will be
|
(a) 10 Ω |
(b) 1 W |
(c) 0.1 W |
(d) 0.001 W |
(c) 0.1 W
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A radioactive material has an initial amount 16gm. After 120 days it reduces to 1gm, then the half-life of radioactive material is
|
(a) 60 days |
(b) 30 days |
(c) 40 days |
(d) 240 days |
A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is
| (a) Greater than at Q |
| (b) Same as at Q |
| (c) Less than at Q |
| (d) Greater or less than at Q depending upon the strength of the current |
In a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is
|
(a) Violet |
(b) Red |
|
(c) The mean colour |
(d) All the colours together |
The image of an extended object, placed perpendicular to the principal axis of a mirror, will be erect if:
Energy of an electron in an excited hydrogen atom is – 3.4 eV. Its angular momentum will be: h = 6.626 
|
(a) 1.11 |
(b) 1.51 |
(c) 2.11 |
(d) 3.72 |
