An air filled parallel plate capacitor has capacity C. If distance between plates is doubled and it is immersed in a liquid then capacity becomes twice. Dielectric constant of the liquid is
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
(d) 4
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Three light bulbs of 40 W, 60 W and 100 W are connected in series with 220 V source. Which one of the bulbs will glow brightest
|
(a) 40 W |
(b) 60 W |
|
(c) 100 W |
(d) All with the same brightness |
Intensity of magnetic field due to earth at a point inside a hollow steel box is
|
(a) Less than outside |
(b) More than outside | (c) Same | (d) Zero |
The resistances of a wire at temperatures t℃ and 0℃ are related by
|
(a) |
(b) |
(c) |
(d) |
If R is the Rydberg’s constant for hydrogen the wave number of the first line in the Lyman series will be
|
(a) |
(b) |
(c) |
(d) 2R |
The number of electrons in 1.6 C charge will be
|
(a) |
(b) |
(c) 1.1 |
(d) 1.1 |
When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is
|
(a) Polarised |
(b) Of longer wavelength |
|
(c) Of shorter wavelength |
(d) Of high intensity |
