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PHYSICS MCQ

Light Energ · ICSE STD 8 (ICSE - English Medium). 10 questions.

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10 questions · timed · auto-graded

MCQ 11 Mark
A convex mirror is used
  • A
    as a shaving mirror
  • B
    as a head mirror by a dentist
  • ✓
    as a rear view mirror by driver
  • D
    as a reflector in torch
Answer
Correct option: C.
as a rear view mirror by driver
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MCQ 21 Mark
The image formed by a concave mirror is of the same size as the object, if the object is placed
  • A
    at the focus
  • B
    between the pole and focus
  • C
    between the focus and centre of curvature
  • ✓
    at the centre of curvature
Answer
Correct option: D.
at the centre of curvature
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MCQ 31 Mark
The image formed by a convex mirror is
  • ✓
    erect and diminished
  • B
    erect and enlarged
  • C
    inverted and diminished
  • D
    inverted and enlarged.
Answer
Correct option: A.
erect and diminished
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MCQ 41 Mark
If the radius of curvature of a concave mirror is $20 \ cm,$ its focal length is:
  • ✓
    $10 \ cm$
  • B
    $20 \ cm$
  • C
    $40 \ cm$
  • D
    $80 \ cm$
Answer
Correct option: A.
$10 \ cm$
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MCQ 51 Mark
A ray of light passing through centre of curvature of a spherical mirror, after reflection
  • A
    passes through the focus
  • B
    passes through the pole
  • C
    becomes parallel to the principal axis
  • ✓
    retraces its own path.
Answer
Correct option: D.
retraces its own path.
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MCQ 61 Mark
The seven colours in the spectrum of sunlight in order, are represented as :
  • ✓
    $\ce{VIBGYOR}$
  • B
    $\ce{VINGYBOR}$
  • C
    $\ce{BIVGYOR}$
  • D
    $\ce{RYOBIVG}$
Answer
Correct option: A.
$\ce{VIBGYOR}$
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MCQ 71 Mark
The property of splitting of white light into its seven constituent colours is known as
  • A
    rectilinear propagation
  • B
    refraction
  • C
    reflection
  • ✓
    dispersion
Answer
Correct option: D.
dispersion
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MCQ 81 Mark
The angle between the normal and refracted ray is called
  • A
    angle of deviation
  • B
    angle of incidence
  • ✓
    angle of refraction
  • D
    the angle of emergence
Answer
Correct option: C.
angle of refraction
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MCQ 91 Mark
A ray of light moving from an optically rarer to a denser medium
  • A
    bends away from the normal
  • ✓
    bends towards the normal
  • C
    remains undeviated
  • D
    none of the above
Answer
Correct option: B.
bends towards the normal
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MCQ 101 Mark
The speed of light in air or vacuum is
  • ✓
    $3 \times 10^8 \ M s ^{-1}$
  • B
    $2.25 \times 10^8 \ m s ^{-1}$
  • C
    $332\  ms ^{-1}$
  • D
    $2.0 \times 10^8 \ ms ^{-1}$
Answer
Correct option: A.
$3 \times 10^8 \ M s ^{-1}$
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MCQ - PHYSICS STD 8 Questions - Vidyadip