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If a star is moving towards the earth, then the lines are shifted towards
|
(a) Red |
(b) Infrared |
(c) Blue |
(d) Green |
In a movie hall, the distance between the projector and the screen is increased by 1% illumination on the screen is
|
(a) Increased by 1% |
(b) Decreased by 1% |
(c) Increased by 2% |
(d) Decreased by 2% |
If the distance of the far point for a myopia patient is doubled, the focal length of the lens required to cure it will become
|
(a) Half |
(b) Double |
|
(c) The same but a convex lens |
(d) The same but a concave lens |
In a Young's double slit experiment the source S and the two slits A and B are vertical with slit A above slit B. The fringes are observed on a vertical screen K. The optical path length from S to B is increased very slightly (by introducing a transparent material of higher refractive index) and the optical path length from S to A is not changed, as a result the fringe system on K moves
|
(a) Vertically downwards slightly |
(b) Vertically upwards slightly |
|
(c) Horizontally, slightly to the left |
(d) Horizontally, slightly to the right |
If m, mn and mp are the masses of 
nucleus, neutron and proton respectively
|
(a) |
(b) |
|
(c) |
(d) |
A wire has a resistance of 6 W. It is cut into two parts and both half values are connected in parallel. The new resistance is ....
|
(a) 12 W |
(b) 1.5 W |
(c) 3 W |
(d) 6 W |
Two galvanometers A and B require 3mA and 5mA respectively to produce the same deflection of 10 divisions. Then
|
(a) A is more sensitive than B |
(b) B is more sensitive than A |
|
(c) A and B are equally sensitive |
(d) Sensitiveness of B is 5/3 times that of A |
The image formed by a concave mirror:
