Two ends of a conductor are at different temperatures the electromotive force generated between two ends is
|
(a) Seebeck electro motive force (e.m.f.) |
(b) Peltier electro motive force (e.m.f.) |
|
(c) Thomson electro motive force (e.m.f.) |
(d) None of these |
(c) Thomson electro motive force (e.m.f.)
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If 
is 6563 Å, then wave length of second line for Balmer series will be
|
(a) |
(b) |
(c) |
(d) None of the above |
The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately
|
(a) 2 eV |
(b) 1 eV |
(c) 0.1 eV |
(d) 3 eV |
A circular loop of radius R carrying current I lies in x-y plane with its centre at origin. The total magnetic flux through x-y plane is
|
(a) Directly proportional to I |
(b) Directly proportional to R |
|
(c) Directly proportional to |
(d) Zero |
A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is
|
(a) 2.5 |
(b) 7.6 |
(c) 2.5 |
(d) 7.6 |
The temperature at which thermal electric power of a thermo couple becomes zero is called
|
(a) Inversion temperature |
(b) Neutral temperature |
|
(c) Junction temperature |
(d) Null temperature |
The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is
|
(a) 49o to the horizontal |
(b) 90o with the vertical |
|
(c) 49o to the vertical |
(d) Along the horizontal |
A ray of light incidents on a plane mirror at an angle of 30°. The deviation produced in the ray is
| (a) 30° | (b) 60° | (c) 90° | (d) 120° |
The potential at a point due to an electric dipole will be maximum and minimum when the angles between the axis of the dipole and the line joining the point to the dipole are respectively
|
(a) 90° and 180 ° |
(b) 0° and 90° |
(c) 90 ° and 0° |
(d) 0° and 180° |
