Entrance Guru: Physics Model questions and answers part 2
1) It is desired to photograph the image of an object placed at a distance of 3 m from plane mirror.The camera .which is at a distance of 4.5 m from mirror should be focussed for
a distance of :
a distance of :
a) 3 m
b) 4.5 m
c) 6 m
d) 7.5 m
2) A convex mirror has a focal length f . A real object ,placed at a distance f in front of it from the pole,produces an image at :
a) 2f
b) f/2
c) f
d) ∞
3) If an object is 30 cm away from a concave mirror of focal length 15 cm ,the image will be:
a) erect
b) virtual
c) diminished
d) of the same size
4) The figure width for red color as compered to that for violet color is approximately :
a) 3 times
b) double
c) 4 times
d) 8 times
5) Thomson discovered
a) x-rays
b) Isotopes
c) Canal rays
d) Fusion
Answers
1) d) 7.5 m
2) b) f/2
3) d) of same size
4) b) double
5) c) Canal rays
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