and 
represents gravitational and electrostatic force respectively between electrons situated at a distance 10 cm. The ratio of 
is of the order of
|
(a) |
(b) 10 |
(c) 1 |
(d) |
(d) 
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In good conductors of electricity, the type of bonding that exists is
|
(a) Ionic |
(b) Vander Waals |
(c) Covalent |
(d) Metallic |
P-type semiconductors are made by adding impurity element
|
(a) As |
(b) P |
(c) B |
(d) Bi |
The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically by
|
(a)
|
(b)
|
(c)
|
(d)
|
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 |
