X-rays of
have frequency
|
(a) 3 |
(b) 3 |
(c) |
(d) |
X-rays of
have frequency
|
(a) 3 |
(b) 3 |
(c) |
(d) |
(b) 3
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A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric field due to the sphere at a distance r from its centre
|
(a) Increases as r increases for r < R |
(b) Decreases as r increases for 0 < r < ∞ |
|
(c) Decreases as r increases for R < r < ∞ |
(d) a, c |
One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then
|
(a) Mass of A and mass of B still remain equal |
|
(b) Mass of A increases |
|
(c) Mass of B decreases |
|
(d) Mass of B increases |
Three resistances 4Ω each of are connected in the form of an equilateral triangle. The effective resistance between two corners is
|
(a) 8 Ω |
(b) 12 Ω |
(c) |
(d) |
Radius of the first orbit of the electron in a hydrogen atom is 0.53 Å. So, the radius of the third orbit will be
|
(a) 2.12 Å |
(b) 4.77 Å |
(c) 1.06 Å |
(d) 1.59 Å |
The plates of a parallel plate condenser are pulled apart with a velocity v. If at any instant their mutual distance of separation is d, then the magnitude of the time of rate of change of capacity depends on d as follows
|
(a) |
(b) |
(c) |
(d) d |