Donor type impurity is found in
|
(a) Trivalent elements |
(b) Pentavalent elements |
|
(c) In both the above |
(d) None of these |
Donor type impurity is found in
|
(a) Trivalent elements |
(b) Pentavalent elements |
|
(c) In both the above |
(d) None of these |
(b) Pentavalent elements
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an isotope of thorium decays in ten stages emitting six a-particles and four b-particles in all. The end product of the decay is
|
(a) |
(b) |
(c) |
(d) |
A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a
|
(a) Convex mirror of focal length 10 cm |
|
(b) Concave mirror of focal length 40 cm |
|
(c) Concave mirror of focal length 60 cm |
|
(d) Concave mirror of focal length 10 cm |
An electron having charge ‘e’ and mass ‘m’ is moving in a uniform electric field E. Its acceleration will be
|
(a) |
(b) |
(c) |
(d) |
In the diagram, the input is across the terminals A and C and the output is across the terminals B and D, then the output is

|
(a) Zero |
(b) Same as input |
(c) Full wave rectifier |
(d) Half wave rectifier |
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material denoted by respectively then
|
(a) |
(b) |
|
(c) |
(d) |