Olympiad – Class VIII – Science - Phy - Light

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Question - 1

'x' is a surface that cannot produce clear images. What is 'X'?

  • A Rough surface
  • B Ideal surface
  • C Smooth surface
  • D Smooth but curved surface

Question - 2

With what is glass coated in order to convert it into a mirror?

  • A Silver
  • B Copper
  • C Aluminium
  • D Platinum

Question - 3

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

Question - 4

What is the phenomenon of light bouncing back into the same medium called?

  • A Reflection
  • B Refraction
  • C Dispersion
  • D Splitting

Question - 5

What is the perpendicular drawn at any point on a mirror called?

  • A Incident ray
  • B Reflected ray
  • C Normal
  • D Image

Question - 6

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

Question - 7

If the angle of incidence is 80°, what will be the angle of reflection?

  • A 80°
  • B 100°
  • C 160°
  • D 20°

Question - 8

Which of the following is used by E.N.T. doctors?

  • A Convex mirror
  • B Convex lens
  • C Plane mirror
  • D Concave mirror

Question - 9

When the angle between two plane mirrors is 60°, how many images will be formed by the mirrors?

  • A 5
  • B 6
  • C 7
  • D 8

Question - 10

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°