Class 10 Light Reflection And Refraction CBSE Questions & Answers

Class 10 · Light Reflection And Refraction

Class 10 Light–Reflection and Refraction CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
When a plane mirror is rotated by an angle Q. What will the rotation of the reflected ray?
  • A
    \({Q \over 2}\)
  • B
    3 Q
  • C
    2 Q
    Correct
  • D
    Q
2
What type of mirrors are generally used to demonstrate reflection of light in Laboratories?
  • A
    convex mirror
  • B
    plane mirror
    Correct
  • C
    None of these
  • D
    concave mirror
3
Irrespective of your distance from a mirror, your image appears erect. The mirror is likely to be
  • A
    concave only
  • B
    either plane or convex
  • C
    convex only
  • D
    plane only
    Correct
4
Mirror formula is given by-
  • A
    \( - {1 \over f} = {1 \over u} + {1 \over v}\)
  • B
    \({1 \over f} = - {1 \over u} + {1 \over v}\)
  • C
    \({1 \over f} = {1 \over u} + {1 \over v}\)
    Correct
  • D
    \({1 \over f} = {1 \over u} - {1 \over v}\)
5
Your school lab has one large window. To find the focal length of a concave mirror using one of the walls as the screen, the experiment may be performed
  • A
    only on the table as per the lab arrangement
  • B
    on the same wall as the window
    Correct
  • C
    near the wall opposite to the window
  • D
    on the wall adjacent to the window
6
The S.I unit of linear magnification is
  • A
    \({{\rm{m}}^{ - {\rm{1}}}}\)
  • B
    no unit
    Correct
  • C
    \({{\rm{m}}^{\rm{2}}}\)
  • D
    m
7
Find the incorrect statement
  • A
    Can vex mirrors are used by dentist to see the large images of teeth of patients
    Correct
  • B
    concave mirrors are used for shaving purpose
  • C
    concave mirrors are used by doctors to focus light inside the ear or inside the mouth for medical examination
  • D
    convex mirrors are used as rear view mirrors in cars, motorcycles, scooters etc
8
When a lemon kept in water in a bowl viewed from side, It appears ___________ than thus actual size
  • A
    None of these
  • B
    same
  • C
    smaller
  • D
    larger
    Correct
9
Which of the following materials cannot be used to make a lens?
  • A
    plastic
  • B
    glass
  • C
    water
  • D
    clay
    Correct
10
If two lenses of power p1 and p2 are put in contact. What will be the net power?
  • A
    \({{\rm{p}}_{\rm{1}}} - {{\rm{p}}_{\rm{2}}}\)
  • B
    \({{\rm{p}}_{\rm{1}}} \times {{\rm{p}}_{\rm{2}}}\)
  • C
    \({{\rm{p}}_{\rm{1}}} + {{\rm{p}}_{\rm{2}}}\)
    Correct
  • D
    \({\rm{p1}}/{\rm{p2}}\)
11
The light travel fastest in
  • A
    water
    Correct
  • B
    kerosene
  • C
    turpentine
  • D
    diamond
12
Where should an object be placed infront of convex lens to get a real image of the size of the object?
  • A
    at infinity
  • B
    between focus and optical centre
  • C
    at principal focus
  • D
    at twice the focal length
    Correct
13
Angle of incidence = Angle of reflection, it is true for-
  • A
    Only plane mirror
  • B
    Both plane mirror and spherical mirror
    Correct
  • C
    Mirrors as well as lens.
  • D
    Only for lens.
14
The focal length of plane mirror is
  • A
    infinity
    Correct
  • B
    10 cm
  • C
    20 cm
  • D
    0.0
15
An object is kept at the centre of curvature of a concave mirror, the distance between the pole of the mirror and the image is
  • A
    equal to f
  • B
    greater than 2f
  • C
    equal to 2f
    Correct
  • D
    between f and 2 f