- a upward.
- (g - a) upward.
- (g - a) downward.
- g downward.
Explanation:
Gravity is the only force acting on the stone when it is released. And, we know that gravity is always in the downward direction.
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Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if
|
(a) A magnetic field is applied normally |
(b) An electric field is applied normally |
|
(c) An electric field is applied tangentially |
(d) A magnetic field is applied tangentially |
Coherent sources are those sources for which
|
(a) Phase difference remain constant |
|
(b) Frequency remains constant |
|
(c) Both phase difference and frequency remains constant |
|
(d) None of these |
Angle of a prism is 30° and its refractive index is and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path
|
(a) 30° |
(b) 60° |
(c) 45° |
(d) |
Figure represents a graph of kinetic energy (K) of photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is

|
(a) 1 eV |
(b) 1.5 eV |
(c) 2 eV |
(d) 3 eV |
A planet of mass m moves in an ellipse around the sun of mass so that its maximum and minimum distances are
and
respectively. The angular momentum of the planet relative to the centre of the sun is
|
(a) |
(b) |
(c) |
(d) |
Work of moderator is
|
(a) To control the velocity of neutrons |
(b) Cooling |
|
(c) As fuel |
(d) It is used for safety |