- A30-300 MHz
- B30-300 GHz
- C30-300 kHz
- D30-300 Hz
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A ray of light travelling inside a rectangular glass block of refractive index
is incident on the glass–air surface at an angle of incidence of 45°. The refractive index of air is 1. Under these conditions the ray
|
(a) Will emerge into the air without any deviation |
|
(b) Will be reflected back into the glass |
|
(c) Will be absorbed |
|
(d) Will emerge into the air with an angle of refraction equal to 90° |
An isolated solid metallic sphere is given +Q charge. The charge will be distributed on the sphere
|
(a) Uniformly but only on surface |
|
(b) Only on surface but non-uniformly |
|
(c) Uniformly inside the volume |
|
(d) Non-uniformly inside the volume |
The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is
|
(a) 0.168 eV |
(b) 16.8 eV |
(c) 1.68 eV |
(d) 2.5 eV |
Infrared radiation was discovered in 1800 by
|
(a) William Wollaston |
(b) William Herschel |
(c) Wilhelm Roentgen |
(d) Thomas Young |
The insulated spheres of radii
and
having charges
and
respectively are connected to each other. There is
|
(a) No change in the energy of the system |
|
(b) An increase in the energy of the system |
|
(c) Always a decrease in the energy of the system |
|
(d) A decrease in the energy of the system unless |
A beam of electrons and protons move parallel to each other in the same direction, then they
|
(a) Attract each other |
(b) Repel each other |
|
(c) No relation |
(d) Neither attract nor repel |