The magnetic susceptibility of any paramagnetic material changes with absolute temperature T as
|
(a) Directly proportional to T |
(b) Remains constant |
|
(c) Inversely proportional to T |
(d) Exponentially decaying with T |
(c) Inversely proportional to T
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An endoscope is employed by a physician to view the internal parts of a body organ. It is based on the principle of
|
(a) Refraction |
(b) Reflection |
|
(c) Total internal reflectionn |
(d) Dispersion |
An electric heater of resistance 6 ohm is run for 10 minutes on a 120 volt line. The energy liberated in this period of time is
|
(a) 7.2 |
(b) 14.4 |
(c) 43.2 |
(d) 28.8 |
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) |
Two identical metal plates show photoelectric effect by a light of wavelength 
falls on plate A and 
on plate B (
. The maximum kinetic energy is
|
(a) 2 |
(b) |
(c) |
(d) |
A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through 180o to deflect the magnet by 30o from magnetic meridian. When this magnet is replaced by another magnet, the upper end of wire is rotated through 270o to deflect the magnet 30o from magnetic meridian. The ratio of magnetic moments of magnets is
|
(a) 1 : 5 |
(b) 1 : 8 |
(c) 5 : 8 |
(d) 8 : 5 |
Magnetic dipole moment is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Constant quantity |
(d) None of these |
