- AExplaining polarisation
- BDetermining focal length of lenses
- CDetermining chromatic aberration
- DGeometrical reconstruction of a wavefront
Explanation:
Huygens considered that light was propagated in longitudinal waves.
Huygen's concept explained the direction of propagation of light waves by geometrical reconstruction of wavefront.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200-volt supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W is
|
(a) 10 Ω |
(b) 20 Ω |
(c) 50 Ω |
(d) 100 Ω |
Two insulated rings, one of slightly smaller diameter than the other are suspended along their common diameter as shown. Initially the planes of the rings are mutually perpendicular. When a steady current is set up in each of them
|
(a) The two rings rotate into a common plane |
|
(b) The inner ring oscillates about its initial position |
|
(c) The inner ring stays stationary while the outer one moves into the plane of the inner ring |
|
(d) The outer ring stays stationary while the inner one moves into the plane of the outer ring |
Which of the following statements about the Bohr model of the hydrogen atom is false
|
(a) Acceleration of electron in n = 2 orbit is less than that in n = 1 orbit |
|
(b) Angular momentum of electron in n = 2 orbit is more than that in n = 1 orbit |
|
(c) Kinetic energy of electron in n = 2 orbit is less than that in n = 1 orbit |
|
(d) Potential energy of electron in n = 2 orbit is less than that in n = 1 orbit |
A coil resistance 20W and inductance 5H is connected with a 100V battery. Energy stored in the coil will be
|
(a) 41.5 J |
(b) 62.50 J |
(c) 125 J |
(d) 250 J |