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Science M.C.Q

light-reflection and refraction · Gujarat Board (GSEB) STD 10 (GSEB - English Medium). 51 questions.

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MCQ 11 Mark
Refractive index of glass is maximum for $..........$ coloured light.
  • ✓
    violet
  • B
    green
  • C
    blue
  • D
    red
Answer
Correct option: A.
violet
violet
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MCQ 21 Mark
Amount of light entering eye is controlled by _______ .
  • A
    eye lens
  • B
    retina
  • C
    ciliary muscles
  • ✓
    iris
Answer
Correct option: D.
iris
iris
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MCQ 31 Mark
Far point of a normal eye is at _______
  • A
    $1 cm$
  • B
    $1 m$
  • ✓
    infinity
  • D
    $25 cm$
Answer
Correct option: C.
infinity
infinity
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MCQ 41 Mark
Far point of a normal eye is at _______ .
  • A
    $1 cm$
  • B
    $1 m$
  • ✓
    infinity
  • D
    $25 cm$
Answer
Correct option: C.
infinity
infinity
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MCQ 51 Mark
Eye-lens is _______ .
  • A
    concave lens
  • B
    convex mirror
  • ✓
    convex lens
  • D
    concave mirror
Answer
Correct option: C.
convex lens
convex lens
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MCQ 61 Mark
Among violet, yellow and red colour light, which light has greatest wavelength ?
  • A
    violet
  • ✓
    red
  • C
    yellow
  • D
    none of above
Answer
Correct option: B.
red
red
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MCQ 71 Mark
Where should an object be placed in front of a convex lens to get a real image of the size of the object? 
  • A
     At the principal focus of the lens
  • ✓
    At twice the focal length of the lens
  • C
     At infinity
  • D
    Between the optical centre of the lens and its principal focus
Answer
Correct option: B.
At twice the focal length of the lens
B. At twice the focal length of the lens
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MCQ 81 Mark
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
  • A
    Between the principal focus and the centre of curvature
  • B
    At the centre of curvature
  • C
     Beyond the centre of curvature
  • ✓
    Between the pole of the mirror and its principal focus
Answer
Correct option: D.
Between the pole of the mirror and its principal focus
D. Between the pole of the mirror and its principal focus
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MCQ 91 Mark
Which one of the following materials cannot be used to make a lens?
  • A
    Water
  • B
    Glass
  • C
    Plastic
  • ✓
    Clay
Answer
Correct option: D.
Clay
D. Clay
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MCQ 101 Mark
A boy is running with speed towards a plane mirror, then at what speed, his image will be running towards him?
  • ✓
    $2$
  • B
    $> $
  • C
    $C. $
  • D
    $< $
Answer
Correct option: A.
$2$
$A. 2_v$
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MCQ 111 Mark
From which of the following letters, we cannot obtain its laterally inverted image?
  • A
    $N$
  • ✓
    $O$
  • C
    $P$
  • D
    $Q$
Answer
Correct option: B.
$O$
$O$
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MCQ 121 Mark
Which type of image of an object cannot be obtained by a convex lens?
  • A
    Real and diminished
  • B
    Real and enlarged
  • ✓
    Virtual and diminished
  • D
    Virtual and enlarged
Answer
Correct option: C.
Virtual and diminished
C. Virtual and diminished
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MCQ 131 Mark
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
  • A
    A convex lens of focal length $50 \ cm$
  • B
    A concave lens of focal length $100 \ cm$
  • ✓
    A convex lens of focal length $5 \ cm$
  • D
     A concave lens of focal length $25 \ cm$
Answer
Correct option: C.
A convex lens of focal length $5 \ cm$
A convex lens of focal length $5 \ cm$
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MCQ 141 Mark
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
  • A
    A.  only plane.
  • B
     only concave.
  • C
    only convex.
  • ✓
     either plane or convex.
Answer
Correct option: D.
 either plane or convex.
D. either plane or convex.
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MCQ 151 Mark
A spherical mirror and a thin spherical lens have each a focal length of $-15 \ cm.$ The mirror and the lens are likely to be ......
  • ✓
    both concave.
  • B
     both convex.
  • C
    the mirror is concave and the lens is convex.
  • D
     mirror is convex, but the lens is concave.
Answer
Correct option: A.
both concave.
A. both concave.
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MCQ 161 Mark
The absolute refractive indices of three substances $A, B$ and $C$ are $1.33, 1.65$ and $1.46$ respectively. In which substance is the speed of light maximum?
  • ✓
    $A$
  • B
    $B$
  • C
    $C$
  • D
    Would be the same in $A, B$ and $C$
Answer
Correct option: A.
$A$
$A$
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MCQ 171 Mark
Magnification produced by a rear-view mirror fitted in vehicles……..
  • ✓
    is always less than $1.$
  • B
    is always equal to $1.$
  • C
    is always more than $1.$
  • D
    can be more than or less than $1$ depending upon the position of the object front of the mirror.
Answer
Correct option: A.
is always less than $1.$
A. is always less than $1.$
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MCQ 181 Mark
A ray of light travelling in air is obliquely incident on undisturbed horizontal surface of pond water. Inside the water, it...
  • A
    will travel without deviation.
  • B
    will bend away from the normal drawn at the point of incidence.
  • ✓
    will bend towards the normal drawn at the point of incidence.
  • D
    will turn back following the original path.
Answer
Correct option: C.
will bend towards the normal drawn at the point of incidence.
C. will bend towards the normal drawn at the point of incidence.
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MCQ 191 Mark
An object is kept at the centre of curvature of a concave mirror. The distance between the image of the object and pole of the mirror………..
  • A
    would be equal to 
  • B
    would be less than $2$ but more than 
  • ✓
    would be equal to $2$
  • D
    would be more than $2$
Answer
Correct option: C.
would be equal to $2$
would be equal to $2f.$
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MCQ 201 Mark
A virtual image of an object is formed by a mirror, then...
  • A
    it would be a convex mirror.
  • B
    it would be a concave mirror.
  • C
    it would be a plane mirror.
  • ✓
    it would be any one of the mirrors given above.
Answer
Correct option: D.
it would be any one of the mirrors given above.
D. it would be any one of the mirrors given above.
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MCQ 211 Mark
No matter how far you stand from a mirror, your image appears always erect. The mirror is likely to be...
  • A
    plane only
  • B
    concave only
  • C
    convex only
  • ✓
    either plane or convex
Answer
Correct option: D.
either plane or convex
D. either plane or convex
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MCQ 221 Mark
What is the angle of refraction for a light ray incident normal to the surface of a medium?
  • A
    $90^\circ$
  • B
    $60^\circ$
  • C
    $30^\circ$
  • ✓
    $0^\circ$
Answer
Correct option: D.
$0^\circ$
$0^\circ$
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MCQ 231 Mark
What happens to an obliquely incident ray travelling from glass to air?
  • A
    It bends towards the normal.
  • ✓
    It bends away from the normal.
  • C
    It does not undergo refraction.
  • D
    It turns back following the original path.
Answer
Correct option: B.
It bends away from the normal.
B. It bends away from the normal.
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MCQ 241 Mark
The absolute refractive indices of water, glass and diamond are $1.33, 1.50$ and $2.42$ respectively. Which medium has maximum optical density ?
  • A
    Water
  • B
    Glass
  • ✓
    Diamond
  • D
    Data not enough to draw any conclusion
Answer
Correct option: C.
Diamond
Diamond
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MCQ 251 Mark
Which type of image is formed by a convex mirror ?
  • A
    Real, inverted and diminished
  • ✓
    Virtual, erect and diminished
  • C
    Real, inverted and enlarged
  • D
    Virtual, erect and enlarged
Answer
Correct option: B.
Virtual, erect and diminished
B. Virtual, erect and diminished
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MCQ 261 Mark
Where should the object be placed to obtain a real and magnified image using a concave mirror?
  • A
    Between the pole and the principal focus of the mirror
  • B
    At the principal focus of the mirror
  • ✓
    Between the principal focus and the centre of curvature of the mirror
  • D
    At the centre of curvature of the mirror
Answer
Correct option: C.
Between the principal focus and the centre of curvature of the mirror
C. Between the principal focus and the centre of curvature of the mirror
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MCQ 271 Mark
Where should the object be placed to obtain a real and diminished image using a concave mirror ? 
  • A
    Between the principal focus and the pole of the mirror
  • B
    At the centre of curvature of the mirror
  • C
    Between the principal focus and the centre of curvature of the mirror
  • ✓
    Beyond the centre of curvature of the mirror
Answer
Correct option: D.
Beyond the centre of curvature of the mirror
D. Beyond the centre of curvature of the mirror
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MCQ 281 Mark
Where should the object be placed to obtain its real image of the same size as the object using a concave mirror?
  • A
    At infinite distance from the mirror
  • ✓
    At the centre of curvature of the mirror
  • C
    At the principal focus of the mirror
  • D
    Between the principal focus and the centre of curvature of the mirror
Answer
Correct option: B.
At the centre of curvature of the mirror
B. At the centre of curvature of the mirror
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MCQ 291 Mark
What is the diameter of the reflecting circular surface of a spherical mirror called?
  • ✓
    Aperture
  • B
    Radius of curvature
  • C
    Focal length
  • D
    Principal axis
Answer
Correct option: A.
Aperture
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MCQ 301 Mark
An object placed in front of a convex mirror is moved from far$-$off distance towards the pole of the mirror. Then the image$.....$
  • ✓
    moves towards the pole.
  • B
    moves away from the pole.
  • C
    first moves away from the pole and then towards the pole.
  • D
    first moves towards the pole and then away from the pole.
Answer
Correct option: A.
moves towards the pole.
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MCQ 311 Mark
An object placed in front of a convex mirror is moved from far-off distance towards the pole of the mirror. Then size of the image$......$
  • ✓
    increases.
  • B
    decreases.
  • C
    remains constant.
  • D
    first increases and then decreases.
Answer
Correct option: A.
increases.
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MCQ 321 Mark
Where should an object be placed to obtain its image as real, inverted and of the same height as the object by a convex lens?
  • A
    At the principal focus
  • B
    Between the principal focus and centre of curvature
  • ✓
    At the centre of curvature
  • D
    Between the optical centre and principal focus
Answer
Correct option: C.
At the centre of curvature
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MCQ 331 Mark
The distance between the object at $2 \ m$ from a plane mirror and its image is$…..$
  • ✓
    $4 \ m$
  • B
    $1 \ m$
  • C
    $2 \ m$
  • D
    $3 \ m$
Answer
Correct option: A.
$4 \ m$
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MCQ 341 Mark
If a spherical mirror is immersed in water, then its focal length$ .....$
  • A
    changes.
  • ✓
    does not change.
  • C
    may or may not change
  • D
    becomes zero.
Answer
Correct option: B.
does not change.
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MCQ 351 Mark
The focal length of a plane mirror is$………$
  • A
    Zero
  • ✓
    infinity
  • C
    equal to half the object distance
  • D
    equal to the object distance
Answer
Correct option: B.
infinity
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MCQ 361 Mark
From which of the following letters, can we obtain its laterally inverted image?
  • A
    $W$
  • B
    $X$
  • C
    $Y$
  • ✓
    $Z$
Answer
Correct option: D.
$Z$
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MCQ 371 Mark
The magnification produced by a plane mirror is always$……..$
  • A
    more than $1$
  • ✓
    $1$
  • C
    less than $1$
  • D
    zero
Answer
Correct option: B.
$1$
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MCQ 381 Mark
Where, in front of a concave mirror, should an object be placed to get its virtual and erect image?
  • A
    At principal focus $F$
  • B
    At centre of curvature $C$
  • ✓
    Between the principal focus and the pole
  • D
    Beyond the centre of curvature
Answer
Correct option: C.
Between the principal focus and the pole
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MCQ 391 Mark
Through which of the following points, will a ray passing through the centre of curvature $(C)$ and reflected by a concave mirror pass?
  • A
    Focus
  • ✓
    Centre of curvature
  • C
    Pole
  • D
    All
Answer
Correct option: B.
Centre of curvature
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MCQ 401 Mark
What is the relation between the radius of curvature $(R)$ and the focal length $()$ of a spherical mirror?
  • A
    $R =4$
  • B
    $R = 1$
  • ✓
    $R = 2$
  • D
    $R = 3$
Answer
Correct option: C.
$R = 2$
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MCQ 411 Mark
Which of the following always form virtual image?
  • A
    Concave mirror and convex lens
  • ✓
    Convex mirror and concave lens
  • C
    Convex mirror and convex lens
  • D
    Concave mirror and concave lens
Answer
Correct option: B.
Convex mirror and concave lens
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MCQ 421 Mark
Which type of image cannot be obtained by a concave mirror?
  • A
    Real and enlarged
  • B
    Real and diminished
  • C
    Virtual and enlarged
  • ✓
    Virtual and diminished
Answer
Correct option: D.
Virtual and diminished
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MCQ 431 Mark
If the absolute refractive indices of water and glass are  and  respectively, then what is the ratio of the speed of light in water to that in glass?
  • A
    $\frac{7}{5}$
  • B
    $\frac{9}{5}$
  • ✓
    $\frac{9}{8}$
  • D
    $\frac{7}{6}$
Answer
Correct option: C.
$\frac{9}{8}$
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MCQ 441 Mark
Which type of image is formed by a plane mirror ?
  • A
    Real and inverted
  • B
    Real and erect
  • ✓
    Virtual and erect
  • D
    Virtual and inverted
Answer
Correct option: C.
Virtual and erect
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MCQ 451 Mark
If the absolute refractive indices of water, benzene and sapphire are $1.33, 1.50$ and $1.77$ respectively, then which medium has maximum relative refractive index?
  • ✓
    Sapphire relative to water
  • B
    Sapphire relative to benzene
  • C
    Benzene relative to water
  • D
    Water relative to benzene
Answer
Correct option: A.
Sapphire relative to water
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MCQ 461 Mark
What is the focal length of a convex lens having power $+5.0 D?$
  • A
    $-10 \ cm$
  • B
    $-20 \ cm$
  • C
    $+10 \ cm$
  • ✓
    $+20 \ cm$
Answer
Correct option: D.
$+20 \ cm$
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MCQ 471 Mark
What is the centre of a spherical mirror called?
  • A
    Principal focus
  • B
    Centre of curvature
  • C
    Principal axis
  • ✓
    Pole
Answer
Correct option: D.
Pole
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MCQ 481 Mark
Which of the lenses with focal length $10 \ cm, 20 \ cm, 25 \ cm$ and $50 \ cm$ has maximum power?
  • A
    $50 \ cm$
  • B
    $25 \ cm$
  • C
    $20 \ cm$
  • ✓
    $10 \ cm$
Answer
Correct option: D.
$10 \ cm$
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MCQ 491 Mark
The absolute refractive index of any medium is$………$
  • A
    $1$
  • ✓
    $> 1$
  • C
    $< 1$
  • D
    zero
Answer
Correct option: B.
$> 1$
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MCQ 501 Mark
Which of the following materials has maximum optical density?
  • A
    Glass
  • B
    Water
  • C
    Carbon disulphide
  • ✓
    Diamond
Answer
Correct option: D.
Diamond
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