Three resistances, each of 1 ohm, are joined in parallel. Three such combinations are put in series, then the resultant resistance will be
|
(a) 9 ohm |
(b) 3 ohm |
(c) 1 ohm |
(d) |
(c) 1 ohm
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Radius of first Bohr orbit is r. What is the radius of 2nd Bohr orbit?
| (a) 8r | (b) 2r | (c) 4r |
(d) 2
|
In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is
|
(a) 1.0 mm |
(b) 0.1 mm |
(c) 0.05 mm |
(d) 0.01 mm |
A short bar magnet with its north pole facing north forms a neutral point at P in the horizontal plane. If the magnet is rotated by 90o in the horizontal plane, the net magnetic induction at P is (Horizontal component of earth’s magnetic field = 
)
|
(a) 0 |
(b) 2 |
(c) |
(d) |
In a P-type semiconductor, germanium is doped with
|
(a) Boron |
(b) Gallium |
(c) Aluminium |
(d) All of these |
If q is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is
|
(a) |
(b) |
|
(c) |
(d) |
