|
1. A
ray of light strikes the surface of mirror at an angle of 300 with
the mirror. The angle of reflection is:
|
(a)
300
(b) 600 (c) 450 (d) none.
|
2. An
object 20cm high is placed at a distance of 100 cm from a plane mirror .The
size of the image will be.
|
(a) 20 cm
(b)
40cm (c) 10cm (d) 100cm
|
3. Velocity of light in vacuum is
|
(a)3×108 cm/s (b)
3×108 km/s (c)3×108m/s
(d)none of these
|
4. A concave mirror is a part of a sphere of
radius 30cm.It’s focal length is
|
(a) at
infinity
(b)10cm
(c)15cm (d)60cm
|
5 . Magnification produced by a plane mirror is
|
(a)-1 (b)
zero
(c)
+1 (d) infinity
|
6 . Mirror used for focusing light is
|
(a)Concave (b) Convex
(c)
plane (d) none
|
7. A concave mirror forms a real and enlarged
image of an object if the object is placed at/between
|
(a)
2F (b)
F
(c)F and
C (d)F and P
|
8. Focal length of a plane mirror is
|
(a) zero ( b)infinity (c)double of
its aperture (d)half of its aperture
|
9. When a ray of light is incident normally,
the angle of incidence is
|
(a) 900
(b)
0 (c) 450
(d) none
|
10. A stick in water appears broken due to
|
(a)reflection of light (b) refraction of light (c)
total internal reflection (d) none of these
|
11.If angle of incidence is 00 then
angle of reflection is
|
(a) 900
(b) 00
(c)450 (d)600
|
12. Refractive index of diamond with respect
to vacuum is 2.5, then the velocity of light in diamond is.
|
(a) 25×108 m/s (b)2.5×108 m/s (c)1.2×108 m/s (d)2.1×108m/s
|
13. Velocity of light in diamond is
|
(a)2.1×108
(b)1.2×108
(c)1.5×108
(d)2.5×108
|
14. When a ray goes from an optically rarer
medium to a denser medium, it
|
(a) goes straight (b)bends away from normal
|
(c) bends towards
normal (d) reflect back
|
15. Lateral displacement is directly
proportional to:
|
(a) Angle of incidence (b) angle of refraction
|
(c) Thickness of the
slab (d) velocity of light
|
16.To a fish, the plane surface of earth appears
to be enclosed within an angle of
|
(a)600 (b)1800 (c)970 (d)450
|
17. Power of a lens is 2D, it’s focal length
is
|
(a)-0.5 m (b)50 cm (c)150cm (d)50m
|
18. The splitting of light into its
component colors is called
|
(a) refraction
(b)spectrum (c) dispersion (d)diffraction
|
19. A drop of water appears like pearl due to
|
(a)refraction (b) none (c)reflection (d) total
internal reflection
|
20. curvature of a plane glass is
|
(a)infinity (b)zero (c) equal to C (d)none
|
8th Physics: Light and Our Eyes
| Class 8 light and vision Solved MCQ paper -01 Download File Class 8 light and vision Solved Test paper -02 Download File Class 8 light: Basic science Solved question Download Class 8 light and vision Test paper -01 Download File |
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