Section 1 of 1
K.V Basti On-Line Test
Class -- x Science Light Part-2
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Your Name-
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Q-1 Main cause of refraction is-
Q-1 Main cause of refraction is-
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change in the speed of light in going from one medium to another
absorption of some part of light by the medium
Reflection of light by medium
Higher energy level of the light
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Q-2 sin i / sin r = n this relationship known as
Q-2 sin i / sin r = n this relationship known as
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Newtons law
Laws of refraction
law of relection
Snells Law
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Q-3 Refractive index of glass with respect to air is 3/2. Refractive index of air with respect to glass will be-
Q-3 Refractive index of glass with respect to air is 3/2. Refractive index of air with respect to glass will be-
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1.5
2/3
1/3
6
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Q-4 When light goes from rarer to denser medium
Q-4 When light goes from rarer to denser medium
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it bends towards normal at the interface of two media
it bends away from normal to the interface of two media.
it does not bend.
None of these
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Q-5 Which lens is known as Diverging lens-
Q-5 Which lens is known as Diverging lens-
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Concave
Convex
both concave & convex
None of these
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Q-6 An object is placed at 2F in front of a convex lens. Position & nature of the image will be-
Q-6 An object is placed at 2F in front of a convex lens. Position & nature of the image will be-
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At 2F on other side of the lens, erect & large
At 2F on same side of the object, inverted & small
At 2F on other side of the lens, inverted & same size of the object
At 2F on other side of the lens, inverted & large
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Q-7 Lens formula is-
Q-7 Lens formula is-
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1/f = 1/v+ 1/u
u-v/uv = 1/f
1/f= 1/u - 1/v
v-u/uv = 1/f
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Q-8 Unit of power of lens is-
Q-8 Unit of power of lens is-
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Dyopter
Waat
Meter
Kilowaat
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Q-9 Focal length of a concave lens is 2 m. Its power will be-
Q-9 Focal length of a concave lens is 2 m. Its power will be-
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5 D
2 D
0.5 D
50 D
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Q-10 Power of two lense are + 10 D & - 2.5 D. The power of combination of these two lenses will be-
Q-10 Power of two lense are + 10 D & - 2.5 D. The power of combination of these two lenses will be-
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12.5 D
-12.5 D
7.5 D
- 7.5 D
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