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
Rainbow is formed due to
  • A
    Reflection of light by water droplets
  • B
    All of these
  • C
    Dispersion of light by water droplets
    Correct
  • D
    Refraction of light through air
2
Which type of mirror always forms virtual, erect and image of same side?
  • A
    Plane mirror
    Correct
  • B
    Biconcave mirror
  • C
    Convex mirror
  • D
    Concave mirror
3
Rainbow is formed due to
  • A
    Refraction of light through air
  • B
    Dispersion of light by water droplets
    Correct
  • C
    Reflection of light by water droplets
  • D
    All of these
4
Process of bouncing back of light in same medium is called
  • A
    Reflection of light
    Correct
  • B
    Refraction of light
  • C
    Inversion of light
  • D
    Dispersion of light
5
In regular reflection
  • A
    Reflected rays are parallel to each other
    Correct
  • B
    Reflected rays intersect each other
  • C
    Refracted rays are parallel to each other
  • D
    Reflected rays are perpendicular to each other
6
Which source of light is called ultimate source of light?
  • A
    Moon
  • B
    Street light
  • C
    Electric bulb
  • D
    Sun
    Correct
7
Dentist use concave mirror because as it forms
  • A
    Inverted image
  • B
    Erect image
  • C
    Diminished image
  • D
    Magnified image
    Correct
8
Which type of mirror is used to make Periscope?
  • A
    Virtual mirror
  • B
    Plane mirror
    Correct
  • C
    Convex mirror
  • D
    Concave mirror
9
The most popular resource for visual challenged person is called
  • A
    Audio system
  • B
    Braille
    Correct
  • C
    All of the above
  • D
    Touch pad
10
In convex mirror, the reflection of light takes place at
  • A
    Bent in surface
  • B
    Bulging out surface
    Correct
  • C
    Flat surface
  • D
    An uneven surface
11
Braille system has __________ dot pattern.
  • A
    63
    Correct
  • B
    25
  • C
    60
  • D
    36
12
Which of the following instrument is used to obtain coloured pattern and designs?
  • A
    Digital camera
  • B
    Kaleidoscope
    Correct
  • C
    Pinhole camera
  • D
    Periscope
13
Which of the following is not an optical aid?
  • A
    Bifocal lens
  • B
    Hearing aid
    Correct
  • C
    Contact lens
  • D
    Magnifier
14
Solar cooker is used to
  • A
    Heat water
  • B
    Produce electricity
  • C
    Irrigate crops
  • D
    Cook food
    Correct
15
The amount of light entering the eye ball is controlled by
  • A
    Cilliary muscle
  • B
    Optic nerve
  • C
    Eye lens
  • D
    Iris
    Correct