An isolated solid metallic sphere is given +Q charge. The charge will be distributed on the sphere
|
(a) Uniformly but only on surface |
|
(b) Only on surface but non-uniformly |
|
(c) Uniformly inside the volume |
|
(d) Non-uniformly inside the volume |
(a) Uniformly but only on surface
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The strength of the magnetic field at a point r near a long straight current carrying wire is B. The field at a distance 
will be
|
(a) |
(b) |
(c) 2B |
(d) 4B |
Which radiation in sunlight, causes heating effect
|
(a) Ultraviolet |
(b) Infrared |
(c) Visible light |
(d) All of these |
A sphere of radius R has a uniform distribution of electric charge in its volume. At a distance x from its centre, for x < R, the electric field is directly proportional to
|
(a) |
(b) |
(c) x |
(d) |
In the given network capacitance, 
and 
. What is the resultant capacitance between A and B
|
(a) 2.2 μF |
(b) 3.2 μF |
(c) 1.2 μF |
(d) 4.7 μF |
There is a solid sphere of radius ‘R’ having uniformly distributed charge. What is the relation between electric field ‘E’ (inside the sphere) and radius of sphere ‘R’ is
|
(a) E ∝ |
(b) E ∝ |
(c) E ∝ |
(d) E ∝ |
The half-life of a sample of a radioactive substance is 1 hour. If 8 
atoms are present at t = 0, then the number of atoms decayed in the duration t = 2 hour to t = 4 hour will be
|
(a) 2
|
(b) 1.5
|
(c) Zero |
(d) Infinity |
A circular metal plate of radius R is rotating with a uniform angular velocity ω with its plane perpendicular to a uniform magnetic field B. Then the emf developed between the centre and the rim of the plate is
|
(a) πω |
(b) ω |
(c) πω |
(d) ω |
Equal charges are given to two spheres of different radii. The potential will
|
(a) Be more on the smaller sphere |
|
(b) Be more on the bigger sphere |
|
(c) Be equal on both the spheres |
|
(d) Depend on the nature of the materials of the spheres |
Ray optics fails when
|
(a) The size of the obstacle is 5 cm |
|
(b) The size of the obstacle is 3 cm |
|
(c) The size of the obstacle is less than the wavelength of light |
|
(d) (a) and (b) both |
