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Science MCQ

PHYSICS CH6 Light · Tamil Nadu Board STD 9 (Tamil - English Medium). 45 questions.

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45 questions · timed · auto-graded

MCQ 21 Mark
When a beam of white light passes through a prism it gets ______.
  • A
    reflected
  • B
    only deviated
  • C
    deviated and dispersed
Answer
When a beam of white light passes through a prism it gets reflected
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MCQ 31 Mark
When the reflecting surface is curved outwards the mirror formed will be ______.
  • A
    concave mirror
  • B
    convex mirror
  • C
    plane mirror
Answer
When the reflecting surface is curved outwards the mirror formed will be convex mirror 
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MCQ 41 Mark
We can create enlarged, virtual images with ______.
  • A
    concave mirror
  • B
    plane mirror
  • C
    convex mirror
Answer
We can create enlarged, virtual images with concave mirror
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MCQ 51 Mark
______ is used as reflectors in torchlight.
  • A
    Concave mirror
  • B
    Plane mirror
  • C
    Convex mirror
Answer
Concave mirror  is used as reflectors in torchlight.
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MCQ 61 Mark
A ray of light passes from one medium to another medium. Refraction takes place when angle of incidence is ______.
  • A
    0°
  • B
    45°
  • C
    90°
Answer
A ray of light passes from one medium to another medium. Refraction takes place when angle of incidence is 45°
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MCQ 71 Mark
The focal length of a concave mirror is 5cm. Its radius of curvature is
  • A
    5 cm
  • ✓
    10 cm
  • C
    2.5 cm
Answer
Correct option: B.
10 cm
10 cm
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MCQ 81 Mark
Which of the following statements about total internal reflection is true?
  • A
    angle of incidence should be greater than the critical angle
  • B
    light must travel from a medium of higher refractive index to a medium of lower refractive index
  • ✓
    both (a) and (b)
Answer
Correct option: C.
both (a) and (b)
both (a) and (b)
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MCQ 91 Mark
A real and enlarged image can be obtained by using a
  • A
    convex mirror
  • B
    plane mirror
  • ✓
    concave mirror
Answer
Correct option: C.
concave mirror
concave mirror
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MCQ 101 Mark
The field of view is maximum for ………………… (* FOV is the extent of the observable area that is seen at any given instant)
  • A
    plane mirror
  • B
    concave mirror
  • ✓
    convex mirror
Answer
Correct option: C.
convex mirror
convex mirror
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MCQ 111 Mark

A ray of light travels from air into a glass block as shown. It makes an angle of 30° with the surface of the block. If the refractive index of the glass is 1.5, what will be the angle of refraction?

Image

  • A
    35.26°
  • B
    1.30°
  • C
    48.59°
  • ✓
    19.47°
Answer
Correct option: D.
19.47°
19.47°
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MCQ 121 Mark
A ray of light travelling in medium 1 strikes and travels into another transparent medium 2. If the speed of light is greater in medium 1, the ray will
  • ✓
    refract towards the normal
  • B
    have an angle of incidence smaller than be angle of refraction
  • C
    refract away from the normal
  • D
    undergo total internal reflection
Answer
Correct option: A.
refract towards the normal
refract towards the normal
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MCQ 131 Mark
A bundle of glass threads, each of which is capable of transmitting messages using light waves is called
  • A
    microscope
  • B
    convex
  • C
    periscope
  • ✓
    optic fibre
Answer
Correct option: D.
optic fibre
optic fibre
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MCQ 141 Mark
When light is going from a denser to a less dense medium, the critical angle is the angle of incidence for which the angle of refraction is
  • A
    48°
  • ✓
    90°
  • C
    42°
  • D
    51°
Answer
Correct option: B.
90°
90°
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MCQ 151 Mark
Outer concentric shell in optic fiber is called
  • ✓
    cladding
  • B
    core
  • C
    mantel
  • D
    coat
Answer
Correct option: A.
cladding
cladding
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MCQ 161 Mark
For a spherical mirror ………………….. is true.
  • A
    f = 2R
  • ✓
    R = 2f
  • C
    fR = 2
  • D
    $f R=\frac{1}{2}$
Answer
Correct option: B.
R = 2f
R = 2f
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MCQ 171 Mark
Entire light is reflected back into denser medium is called
  • ✓
    total internal reflection
  • B
    refraction
  • C
    reflection
  • D
    total external refraction.
Answer
Correct option: A.
total internal reflection
(a) total internal reflection
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MCQ 181 Mark
Ratio of sine of angle of incidence to sine of angle of refraction is ………………….
  • A
    gravitational law
  • B
    law of reflection
  • C
    law of refraction
  • ✓
    snell’s law.
Answer
Correct option: D.
snell’s law.
snell’s law.
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MCQ 191 Mark
Bending of light as it passes from one medium to another is called
  • A
    reflection
  • B
    diffraction
  • ✓
    refraction
  • D
    deviation
Answer
Correct option: C.
refraction
refraction
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MCQ 201 Mark
Refractive index of a medium is …………………..
  • B
    speed of light in vacuum to speed of light in air
  • C
    focal length to object distance
  • D
    speed of light in the medium × speed of light in the air
Answer
speed of light in air to speed of light in vacuum
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MCQ 241 Mark
The mirror formula is…………………..
  • A
    (\frac{1}{u}-\frac{1}{v}=\frac{1}{f}$
  • B
    (\frac{1}{f}+\frac{1}{u}=\frac{1}{v}$
  • C
    (f=\frac{u v}{u+v}$
  • D
    (f=\frac{u+v}{u v}$
Answer
(\frac{1}{f}=\frac{1}{u}+\frac{1}{v}$
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MCQ 251 Mark
As you move an object always from a convex mirror, its image becomes………………….. and moves towards
  • A
    smaller, infinity
  • ✓
    smaller, focus
  • C
    enlarged, infinity
  • D
    enlarged, focus
Answer
Correct option: B.
smaller, focus
smaller, focus
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MCQ 261 Mark
The image formed by a convex mirror is always
  • A
    real
  • B
    enlarged
  • C
    virtual & enlarged
  • ✓
    diminished
Answer
Correct option: D.
diminished
diminished
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MCQ 281 Mark
The refractive index of a denser medium with respect to rarer medium is
  • A
    1
  • ✓
    greater than 1
  • C
    less than 1
  • D
    negative
Answer
Correct option: B.
greater than 1
greater than 1
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MCQ 291 Mark
The image formed by a plane mirror is
  • A
    real
  • B
    diminished
  • C
    enlarged
  • ✓
    laterally inverted
Answer
Correct option: D.
laterally inverted
laterally inverted
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MCQ 311 Mark
Magnification for the………………….. image is always …………………..
  • A
    real, positive
  • ✓
    real, negative
  • C
    real, negative
  • D
    virtual, positive
Answer
Correct option: B.
real, negative
real, negative
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MCQ 321 Mark
Total internal reflection will occur if the angle of reflection is
  • A
    45°
  • B
    60°
  • C
    90°
  • ✓
    99°
Answer
Correct option: D.
99°
99°
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MCQ 331 Mark
According to sign convention the distance of the image.
  • A
    is always positive
  • B
    is always negative
  • D
    is equal to image height
Answer
maybe positive or negative
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MCQ 341 Mark
According to sign convention the distance of the object.
  • A
    is always positive
  • ✓
    is always negative
  • C
    maybe positive or negative
  • D
    is equal to object height.
Answer
Correct option: B.
is always negative
is always negative
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MCQ 351 Mark
The incident ray parallel to the principal axis of a mirror ………………….. after reflection.
  • A
    passes through C
  • ✓
    passes through F
  • C
    passes through P
  • D
    reverts back in the opposite direction
Answer
Correct option: B.
passes through F
passes through F
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MCQ 361 Mark
The incident ray passing through C of a mirror ………………….. after reflection.
  • ✓
    passes through C
  • B
    passes through F
  • C
    passes through P
  • D
    parallel to the principal axis
Answer
Correct option: A.
passes through C
passes through C
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MCQ 371 Mark
The incident ray passing through ‘F of a mirror ………………….. after reflection
  • A
    passes through C
  • B
    passes through F
  • ✓
    passes parallel to the principal axis
  • D
    passes through the pole
Answer
Correct option: C.
passes parallel to the principal axis
passes parallel to the principal axis
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MCQ 381 Mark
Which of the following has the highest refractive index
  • A
    air
  • B
    water
  • ✓
    diamond
  • D
    glass
Answer
Correct option: C.
diamond
diamond
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MCQ 391 Mark
The image formed by a concave mirror is real, inverted and of the same size as that of the object the position of the object should be
  • A
    beyond C
  • B
    between C & F
  • ✓
    at C
  • D
    at F
Answer
Correct option: C.
at C
at C
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MCQ 401 Mark
A boy is standing at a distance of 3m in front of a plane mirror. The distance between the boy and his image is ………………….. M
  • A
    4
  • B
    2
  • ✓
    3
  • D
    6
Answer
Correct option: C.
3
3
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MCQ 411 Mark
In torches, searchlights and head lights of vehicles the bulb is placed …………………………… of the concave mirror.
  • A
    between and F of the reflector
  • ✓
    Very near to F
  • C
    between F & C
  • D
    at C
Answer
Correct option: B.
Very near to F
Very near to F
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MCQ 421 Mark
Under which of the following conditions a concave mirror can form an image larger than the actual object?
  • A
    when the object is kept at a distance equal to its radius of curvature.
  • B
    when object is kept at a distance less than its focal length.
  • ✓
    when object is placed between the focus and centre of curvature
  • D
    when object is kept at a distance greater than its radius of curvature.
Answer
Correct option: C.
when object is placed between the focus and centre of curvature
when object is placed between the focus and centre of curvature
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MCQ 431 Mark
A ray of light as it travels from medium A to medium B refractive index of the medium B relative to medium A is (μB/ μA)
  • A
    (\frac{\sqrt{3}}{\sqrt{2}}$
  • ✓
    (\frac{\sqrt{2}}{\sqrt{3}}$
  • C
    (\frac{1}{\sqrt{2}}$
  • D
    (\sqrt{2}$
Answer
Correct option: B.
(\frac{\sqrt{2}}{\sqrt{3}}$
(\frac{\sqrt{2}}{\sqrt{3}}$
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MCQ 441 Mark
A 10 mm long bin is placed vertically in front of a concave mirror. A 5 mm long image of the bin is formed at 30 cm in front of the mirror. The focal length of this mirror is
  • B

    -30cm

  • C

    -60cm

  • D

    -40cm

Answer

-20cm

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MCQ 451 Mark
A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?
  • A
    45°
  • B
    30°
  • C
    90°
  • ✓
    60°
Answer
Correct option: D.
60°
60°
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