N-type semiconductors will be obtained, when germanium is doped with
|
(a) Phosphorus |
(b) Aluminium |
(c) Arsenic |
(d) Both (a) or (c) |
N-type semiconductors will be obtained, when germanium is doped with
|
(a) Phosphorus |
(b) Aluminium |
(c) Arsenic |
(d) Both (a) or (c) |
(d) Both (a) or (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 parallel plate condenser with oil between the plates (dielectric constant of oil K = 2) has a capacitance C. If the oil is removed, then capacitance of the capacitor becomes
|
(a) |
(b) 2C |
(c) |
(d) |
There is no atmosphere on moon because
|
(a) There is no vegetation |
|
(b) The escape velocity at its surface is very low |
|
(c) Diffusion constant of gases is high |
|
(d) There is vacuum in space |
If a magnet of pole strength m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will be
|
(a) m/4 |
(b) m/2 |
(c) m/8 |
(d) 4m |
A coil having an area
is placed in a magnetic field which changes from
to
in a time interval t. The e.m.f. induced in the coil will be
|
(a) |
(b) |
(c) |
(d) |
Three infinitely long charge sheets are placed as shown in figure. The electric field at point P is
|
(a) |
(b) |
(c) |
(d) |
To make the field radial in a moving coil galvanometer
|
(a) The number of turns in the coil is increased |
|
(b) Magnet is taken in the form of horse-shoe |
|
(c) Poles are cylindrically cut |
|
(d) Coil is wounded on aluminium frame |
Nucleus produced due to a-decay of the nucleus
is
|
(a) |
(b) |
(c) |
(d) |