## MCQ Questions for Class 8 Science: Ch 16 Light 1. Beam of light striking the reflecting surface is called
(a) reflecting ray
(b) incident ray
(c) refracted ray
(d) normal ray
► (b) incident ray

2. What makes objects visible?
(a) The absorption of light by objects
(b) The reflected light from the object
(c) The total internal reflection taking place in an object
(d) The refracted light from the object
► (b) The reflected light from the object

3. If the angle of incidence is 50°, then calculate the angle between the incident ray and the reflected ray.
(a) 50°
(b) 100°
(c) 130°
(d) 80°
► (b) 100°

4. _________ refers to collection of rays.
(a) Photon
(b) Beam
(d) Image
► (b) Beam

5. Which of the following travels faster?
(a) Jet Aero plane
(b) Sound
(c) Light
(d) Supersonic plane
► (c) Light

6. What makes the object visible?
(a) Size
(b) Time
(c) Colour
(d) Light
► (d) Light

7. An example of luminous object is
(a) Star
(b) Smooth surface
(c) Mirror
(d) Cloth
► (a) Star

8. With what is glass coated in order to convert it into a mirror?
(a) Silver
(b) Copper
(c) Aluminium
(d) Platinum
► (a) Silver

9. In a periscope, how are the reflecting mirrors arranged?
(a) Perpendicular to each other
(b) Parallel to each other
(c) At an angle of 90°
(d) At an angle of 60°

10. How many images are obtained when plane mirrors are arranged parallel to each other?
(a) A single image
(b) Two images
(c) Infinite number of images
(d) Zero image
► (c) Infinite number of images

11. Angle of incidence is always
(a) Equal to angle of reflection
(b) Equal to angle of refraction
(c) More than angle of reflection
(d) Less than angle of reflection
► (a) Equal to angle of reflection

12. Which of the following is used by E.N.T. doctors?
(a) Convex mirror
(b) Convex lens
(c) Plane mirror
(d) Concave mirror
► (d) Concave mirror

13. What is the phenomenon of light bouncing back into the same medium called?
(a) Reflection
(b) Refraction
(c) Dispersion
(d) Splitting
► (a) Reflection

14. What is the nature of image formed on the retina of human eye of an object?
(a) Virtual and erect
(b) Virtual and inverted
(c) Real and erect
(d) Real and inverted
► (d) Real and inverted

15. Convex lens focus a real, point sized image at focus, the object is placed
(a) At focus
(b) Between F and 2F
(c) At infinity
(d) At 2F
► (c) At infinity

16. Braille system is used by
(a) Hearing impaired
(b) Black people
(c) Blind people
(d) African people
► (c) Blind people

17. Speed of light is fastest in
(a) Air
(b) Water
(c) Diamond
(d) Glass
► (a) Air

18. Splitting of white rays of light into seven colours is called
(a) Dispersion of light
(b) Reflection of light
(c) Refraction of light
(d) Scattering of light
► (a) Dispersion of light

19. A number of rays from different direction assemble at point are called
(a) Intersecting rays
(b) Parallel rays
(c) Divergent rays
(d) Convergent rays
► (d) Convergent rays

20. What is the name of object through which light can pass?
(a) Opaque
(b) Translucent
(c) Transparent
(d) Luminous
► (c) Transparent

21. The image formed by plane mirror is
(a) real and inverted
(b) real and erect
(c) virtual and inverted
(d) virtual and erect
► (d) virtual and erect

22. The process of banding of seven colours is called
(a) dispersion
(b) spectrum
(c) reflection
(d) normal
► (a) dispersion

23. From a source light travels as rays which are
(a) Divergent
(b) Convergent
(c) Parallel
(d) Diffused
► (c) Parallel

24. What happens in lateral inversion?
(a) The right side of the object will be on the right side of the image.
(b) The left side of the object will be on the left side of the image.
(c) The top of the object will be the bottom of the object.
(d) The right side of the object will be on the left side of the image.
► (d) The right side of the object will be on the left side of the image.

25. The angle of reflection is equal to the angle of incidence
(a) Sometimes
(b) Always
(c) Never
(d) Under special case
► (b) Always