- ANewton.
- BMadam Curie.
- CC. V. Raman.
- DEinstein.
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The number of electrons in 1.6 C charge will be
|
(a) |
(b) |
(c) 1.1 |
(d) 1.1 |
An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed on the other side of the lens at a distance
|
(a) 20 cm |
(b) 10 cm |
(c) 40 cm |
(d) 30 cm |
The reverse biasing in a PN junction diode
| (a) Decreases the potential barrier |
|
(b) Increases the potential barrier |
|
(c) Increases the number of minority charge carriers |
|
(d) Increases the number of majority charge carriers |
$\text{F = Mg}$
$\text{F}=\mu\text{Mg}$
$\text{Mg}\leq\text{F}\leq\text{Mg}\sqrt{1+\mu^2}$
$\text{Mg}\geq\text{F}\geq\text{Mg}\sqrt{1-\mu^2}.$
At any instant the ratio of the amount of radioactive substances is 2 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 1 : 2 |
(d) 1 : 4 |
The reason of seeing the Sun a little before the sunrise is
|
(a) Reflection of the light |
(b) Refraction of the light |
|
(c) Scattering of the light |
(d) Dispersion of the light |
By Huygen's wave theory of light, we cannot explain the phenomenon of
|
(a) Interference |
(b) Diffraction |
(c) Photoelectric effect |
(d) Polarisation |
Black hole is a
|
(a) Hole in the ozone layer of atmosphere |
|
(b) Hole in earth's centre |
|
(c) Highly dense matter available in the atmosphere |
|
(d) Hole in troposphere |