When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms–1)
|
(a) 3 |
(b) |
(c) |
(d) 0.5 |
(c) 
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A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is
|
(a) 1 amp |
(b) 4 amp |
(c) 8 amp |
(d) 16 amp |
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 |
Bonding in a germanium crystal (semi- conductor) is
| (a) Metallic | (b) Ionic |
(c) Vander Waal's type |
(d) Covalent |
A wire has a resistance of 12 ohm. It is bent in the form of equilateral triangle. The effective resistance between any two corners of the triangle is
|
(a) 9 ohms |
(b) 12 ohms |
(c) 6 ohms |
(d) 8/3 ohms |
According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal versus the frequency, of the incident radiation gives a straight line whose slope
|
(a) Is the same for all metals and independent of the intensity of the radiation |
|
(b) Depends on the intensity of the radiation |
|
(c) Depends both on the intensity of the radiation and the metal used |
|
(d) Depends on the nature of the metals used |
There is no couple acting when two bar magnets are placed coaxially separated by a distance because
|
(a) There are no forces on the poles |
|
(b) The forces are parallel and their lines of action do not coincide |
|
(c) The forces are perpendicular to each other |
|
(d) The forces act along the same line |
A charged particle of mass m and charge q describes circular motion of radius r in a uniform magnetic field of strength B. The frequency of revolution is
|
(a) |
(b) |
(c) |
(d) |
