Brilliance of diamond is due to
|
(a) Shape |
(b) Cutting |
|
(c) Reflection |
(d) Total internal reflection |
Brilliance of diamond is due to
|
(a) Shape |
(b) Cutting |
|
(c) Reflection |
(d) Total internal reflection |
(d) Total internal reflection
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We use flint glass prism to disperse polychromatic light because light of different colours
|
(a) Travel with same speed |
|
(b) Travel with same speed but deviate differently due to the shape of the prism |
|
(c) Have different anisotropic properties while travelling through the prism |
|
(d) Travel with different speeds |
An oxide coated filament is useful in vacuum tubes because essentially
|
(a) It has high melting point |
|
(b) It can withstand high temperatures |
|
(c) It has good machanical strength |
|
(d) It can emit electrons at relatively lower temperatures |
According to corpuscular theory of light, the different colours of light are due to
|
(a) Different electromagnetic waves |
|
(b) Different force of attraction among the corpuscles |
|
(c) Different size of the corpuscles |
|
(d) None of the above |
A resistor
dissipates the power P when connected to a certain generator. If the resistor
is put in series with
, the power dissipated by ![]()
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains the same |
|
(d) Any of the above depending upon the relative values of |
The material of fuse wire should have
|
(a) A high specific resistance and high melting point |
|
(b) A low specific resistance and low melting point |
|
(c) A high specific resistance and low melting point |
|
(d) A low specific resistance and a high melting point |