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
Virtual image formed by a concave lens is always
  • A
    Erect and opposite side of object
  • B
    Erect and same side of object
    Correct
  • C
    Magnified and erect
  • D
    Inverted and magnified
2
In which of the following medium light travels fastest?
  • A
    Water
  • B
    Air
    Correct
  • C
    Glass
  • D
    Diamond
3
The bright spot formed on the surface if a convex lens is hold in sun is the
  • A
    Rays of diverging light
  • B
    Dust particles in air
  • C
    Image of sun
    Correct
  • D
    Rays of converging light
4
The image of the object placed at infinity is always formed at
  • A
    Pole
  • B
    Between pole and focus
  • C
    Principal focus
    Correct
  • D
    Centre of curvature
5
The formed by a plane mirror can be obtained on screen because it is
  • A
    Real and erect
  • B
    Virtual and erect
    Correct
  • C
    Virtual and inverted
  • D
    Real and inverted
6
Which of the following object can acts and both converging and diverging mirror?
  • A
    Knife
  • B
    Steel spoon
    Correct
  • C
    Plane mirror
  • D
    Polished floor
7
An object of length 5 cm is placed at a distance of 20 cm in front of a plane mirror. The size and position will be
  • A
    3 cm high and 20 cm behind the mirror
  • B
    5 cm high and 10 cm behind the mirror
  • C
    5 cm high and 20 cm in front of mirror
  • D
    5 cm high and 20 cm behind the mirror
    Correct
8
Light rays enters the room during day due to
  • A
    Diffused reflection
    Correct
  • B
    Regular refraction
  • C
    Diffused refraction
  • D
    Regular reflection
9
When an object is placed in front of the mirror, the left part appear to be right side the mirror is likely to be
  • A
    All of these mirrors
  • B
    Plane mirror or concave mirror
  • C
    Concave mirror and convex mirror
  • D
    Plane mirror or convex mirror
    Correct
10
The splitting of white light into seven colours is called
  • A
    Dispersion
    Correct
  • B
    Splitting
  • C
    Rainbow
  • D
    Spectrum
11
Which one is a transparent object?
  • A
    Wax paper
  • B
    Dense fog
  • C
    Stone
  • D
    Reading glass
    Correct
12
Lens used in spectacles for correction of defects of vision is
  • A
    Lens of different shape
  • B
    Concave or convex
    Correct
  • C
    Always concave
  • D
    Always convex
13
In regular reflection, angle of incidence is always equal to
  • A
    Angle of reflection
    Correct
  • B
    Angle of emergence
  • C
    Angle of refraction
  • D
    Angle of deviation
14
_______________ is a non-luminous body that reflects the light of Sun.
  • A
    Planets
  • B
    All of these
  • C
    Stars
  • D
    Moon
    Correct
15
The elementary particles that define light is called
  • A
    Proton
  • B
    Photon
    Correct
  • C
    Atom
  • D
    Molecules