- ACosmic rays
- BLight raus
- CSound waves
- DAll of these
Explanation:
Interference (constructive and destructive) is one of the basic properties of a wave, therefore it will occur in all the given waves, no matter they are electromagnetic or mechanical, transverse or longitudinal.
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The equivalent resistance between the points P and Q of the circuit given is
|
(a) |
(b) |
(c) 4 R |
(d) 2 R |
The refractive index of water with respect to air is 4 / 3 and the refractive index of glass with respect to air is 3/2. The refractive index of water with respect to glass is
|
(a) |
(b) |
(c) |
(d) 2 |
Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be
|
(a) More with 40 bulbs than with 39 |
(b) More with 39 bulbs than with 40 |
|
(c) Equal in both the cases |
(d) In the ratio of |
If a diamagnetic solution is poured into a U-tube and one arm of this U-tube placed between the poles of a strong magnet with the meniscus in a line with the field, then the level of the solution will
|
(a) Rise |
(b) Fall |
(c) Oscillate slowly |
(d) Remain as such |
A plane mirror produces an image that is:
A cell of internal resistance 1.5Ω and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of 15 Ω is connected between the balance point and the cell, then the balance point will shift
|
(a) To zero |
(b) By 500 cm |
(c) By 750 cm |
(d) None of the above |
