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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The work function of aluminium is 4.2 eV. If two photons, each of energy 3.5 eV strike an electron of aluminium, then emission of electrons will be
|
(a) Possible |
|
(b) Not possible |
|
(c) Data is incomplete |
|
(d) Depend upon the density of the surface |
The power of two convex lenses A and B are 8 diopters and 4 diopters respectively. If they are to be used as a simple microscope, the magnification of
|
(a) B will be greater than A |
(b) A will be greater than B |
|
(c) The information is incomplete |
(d) None of the above |
In a parallel plate condenser, the radius of each circular plate is 12 cm and the distance between the plates is 5mm. There is a glass slab of 3mm thick and of radius 12 cm with dielectric constant 6 between its plates. The capacity of the condenser will be
|
(a) 144 |
(b) 40 pF |
(c) 160 pF |
(d) 1.44 μF |
A proton and a deutron both having the same kinetic energy, enter perpendicularly into a uniform magnetic field B. For motion of proton and deutron on circular path of radius
and
respectively, the correct statement is
|
(a) |
(b) |
(c) |
(d) |
If 200 MeV energy is released in the fission of a single
nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given 1eV = 1.6 ![]()
|
(a) 3.125 |
(b) 3.125 |
(c) 3.125 |
(d) 3.125 |
The wavelength of emission line spectrum and absorption line spectrum of a substance are related as
|
(a) Absorption has larger value |
(b) Absorption has smaller value |
|
(c) They are equal |
(d) No relation |