Class 8 Light CBSE Questions & Answers

Class 8 · Light

This is Science Class 8 Light CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
We can see an object when it
  • A
    Has shining surface
  • B
    Reflect or emit rays of light
    Correct
  • C
    Refract or absorb the rays of light
  • D
    Has bright colour
2
The mirror used as rear view mirror in vehicle is
  • A
    Convex mirror
    Correct
  • B
    Any one of above
  • C
    Plane mirror
  • D
    Concave mirror
3
In which type of mirror image is always laterally inverted?
  • A
    Concave mirror
  • B
    Convex mirror
  • C
    Biconcave mirror
  • D
    Plane mirror
    Correct
4
The path of the light is visible in
  • A
    Presence of dispersing medium
    Correct
  • B
    In gaseous medium only
  • C
    In absence of medium
  • D
    In any medium
5
Dentist use concave mirror because as it forms
  • A
    Diminished image
  • B
    Inverted image
  • C
    Erect image
  • D
    Magnified image
    Correct
6
In plane mirror, image formed is
  • A
    Anywhere behind the mirror
  • B
    Double the distance of mirror
  • C
    At same distance from the mirror
    Correct
  • D
    Half the distance of mirror
7
Objects are visible, when reflected light
  • A
    Comes out from the eyes
  • B
    Bends towards the normal
  • C
    Enters to our eyes
    Correct
  • D
    Bounce back from surface
8
Plane mirror always forms virtual, erect and image of same size. The image is laterally inverted too.
  • A
    Concave mirror
  • B
    Plane mirror
    Correct
  • C
    Biconcave mirror
  • D
    Convex mirror
9
The image formed on cinema screen is an example of
  • A
    Virtual image
  • B
    Real diminished image
  • C
    Real image
    Correct
  • D
    Erect image
10
Normal is
  • A
    Convergent to surface
  • B
    Oblique to surface
  • C
    Parallel to surface
  • D
    Perpendicular to surface
    Correct
11
The word ambulance is written as below on patient carrying vehicle because Rear view mirror of ahead vehicle
Question 11 figure 1
  • A
    Forms erect and laterally inverted image
    Correct
  • B
    Forms real and inverted image
  • C
    Forms virtual and erect image
  • D
    Forms real and magnified image.
12
Real image is always
  • A
    Diminished
  • B
    Inverted
    Correct
  • C
    Parallel
  • D
    Erect
13
Human eye can see maximum ________ separate pictures in a second.
  • A
    12
  • B
    6
  • C
    24
  • D
    16
    Correct
14
Videography and cinematography is based on principle of
  • A
    Far point
  • B
    Persistence of vision
    Correct
  • C
    Least distance of distinct vision
  • D
    Hypermetropia
15
Different colours are due to ability of the object to
  • A
    Absorbs the rays of light
  • B
    Bend the rays of light
  • C
    Divert the rays of light
  • D
    Reflect the rays of light
    Correct