Class 7 Light CBSE Questions & Answers

Class 7 · Light

This is Science Class 7 Light CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Speed of light varies with
  • A
    Particle nature
  • B
    Medium
    Correct
  • C
    Colour
  • D
    Wave nature
2
A number of rays from different direction assemble at point are called
  • A
    Parallel rays
  • B
    Convergent rays
    Correct
  • C
    Divergent rays
  • D
    Intersecting rays.
3
If you stand before a plane mirror, your left hand appears right. This phenomenon is
  • A
    Lateral inversion of light
    Correct
  • B
    Reflection of light
  • C
    Diffusion of light.
  • D
    Shadow formation
4
The point on principal axis though which all the rays parallel to principal axis passes after reflection is called
  • A
    Focal length
  • B
    Pole
  • C
    Radius of curvature
  • D
    Focus
    Correct
5
Glow worm is a natural biological
  • A
    Opaque body
  • B
    Luminous body
    Correct
  • C
    Sparkling body
  • D
    Non-luminous body
6
Periscope is based on
  • A
    Dispersion of light
  • B
    Scattering of light
  • C
    Refraction of light
  • D
    Reflection of light
    Correct
7
Which type of mirror is used as concentrator in solar furnace?
  • A
    Concave mirror
    Correct
  • B
    Plane mirror
  • C
    Bifocal mirror
  • D
    Convex mirror
8
Moon is a
  • A
    Reflector of sunlight
    Correct
  • B
    Refractor of sunlight
  • C
    Luminous body
  • D
    Transparent body
9
Shadows are formed when light falls on an ______________ object.
  • A
    Transparent
  • B
    Opaque
    Correct
  • C
    Permeable
  • D
    Translucent
10
Travelling of light in straight line is called
  • A
    Linear propagation of light
  • B
    Straight propagation of light
  • C
    Bending of light
  • D
    Rectilinear propagation of light
    Correct
11
In regular reflection
  • A
    Reflected rays are parallel to each other
    Correct
  • B
    Reflected rays are perpendicular to each other
  • C
    All of the above
  • D
    Angel of incidence is not equal to angle of reflection
12
Red colour is used as danger signal because. It has
  • A
    Bright colour
  • B
    It can be seen by colour blinds also
  • C
    Short wavelength
  • D
    Long wavelength
    Correct
13
Speed of light
  • A
    Decrease in rarer medium
  • B
    Remain same in all medium
  • C
    Increase in denser medium
  • D
    Changes with medium
    Correct
14
Light is a form of
  • A
    Energy
    Correct
  • B
    Heat
  • C
    Power
  • D
    Temperature
15
Convex mirror is used as rear view mirror because
  • A
    It form virtual image of same size
  • B
    It forms virtual and inverted image
  • C
    It forms real and erect image
  • D
    It forms erect and diminished image
    Correct