While using an electric bulb, the reflection for street lighting should be from
|
(a) Concave mirror |
(b) Convex mirror |
(d) Parabolic mirror |
(d) Parabolic mirror |
(b) Convex mirror
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Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as
| (a) Square of the distance | (b) Cube of the distance |
| (c) Distance | (d) Fourth power of the distance |
A cell of e.m.f. E is connected with an external resistance R, then p.d. across cell is V. The internal resistance of cell will be
|
(a) |
(b) |
(c) |
(d) |
Wave which cannot travel in vacuum is
|
(a) X-rays |
(b) Infrasonic |
(c) Ultraviolet |
(d) Radiowaves |
1 mg gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is
|
(a) 0.91 mg |
(b) 0.25 mg |
(c) 0.5 mg |
(d) 0.125 mg |
$\frac{\triangle\text{l}}{\text{l}}$
$\Big(\frac{\triangle\text{l}}{\text{l}}\Big)^2$
$\sqrt{\frac{\triangle\text{l}}{\text{l}}}$
None of these.
The mass of a substance liberated when a charge ‘q’ flows through an electrolyte is proportional to
|
(a) q |
(b) 1/q |
(c) |
(d) 1/ |
