Light-Reflection and Refraction
Class 10th Science Chapter MCQs
Light Reflection and Refraction Class 10 MCQs Questions
1.
Which of the following can make a parallel beam of light when
light from a point source is incident on it?
(a) Concave mirror as well as
convex lens
(b) Convex mirror as well as concave lens
(c) Two plane
mirrors placed at 90° to each other
(d) Concave mirror as well as concave
lens
Answer
Answer: (a) Concave mirror as well as convex lens
2.
A 10 mm long awl pin is placed vertically in front of a
concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of
the mirror. The focal length of this mirror is
(a) -30 cm
(b) -20 cm
(c) -40cm
(d) -60 cm
Answer
Answer: (b) -20 cm
3.
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
(c) 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
Answer: (c) When object is placed between the focus and centre of curvature
4.
The diagrams showing the correct path of the ray after passing
through the
(a) II and III only
(b) I and II only
(c) I, II and III
(d) I, II and
IV
Answer
Answer: (c) I, II and III
5.
A light ray enters from medium A to medium B as shown in
figure. The refractive index of medium B relative to A will be
(a) greater than unity
(b) less than unity
(c) equal to unity
(d)
zero
Answer
Answer: (a) greater than unity
6.
Beams of light are incident through the holes A and B and
emerge out of box through the holes C and D respectively as shown in the figure.
Which of the following could be inside the box?
(a) A rectangular glass slab
(b) A convex lens
(c) A concave lens
(d) A
prism
Answer
Answer: (a) A rectangular glass slab
7.
A beam of light is incident through the holes on side A and
emerges out of the holes on the other face of the box as show in the figure.
Which of the following could be inside the box?
(a) Concave lens
(b) Rectangular glass slab
(c) Prism
(d) Convex
lens
Answer
Answer: (d) Convex lens
8.
Which of the following statements is true?
(a) A convex
lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has
-4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4
dioptre power having a focal length 0.25 m
(d) A concave lens has -4 dioptre
power having a focal length 0.25 m.
Answer
Answer: (a) A convex lens has 4 dioptre power having a focal length 0.25 m
9.
Magnification produced by a rear view mirror fitted in
vehicles
(a) is less than one
(b) is more than one
(c) is equal to
one
(d) can be more than or less than one depending upon the position of the
object in front of it.
Answer
Answer: (a) is less than one
10.
Rays from Sun converge at a point 15 cm in front of a concave
mirror. Where should an object be placed so that size of its image is equal to
the size of the object?
(a) 15 cm in front of the mirror
(b) 30 cm in
front of the mirror
(c) between 15 cm and and 30 cm in front of the
mirror
(d) more than 30 cm in front of the mirror
Answer
Answer: (b) 30 cm in front of the mirror
11.
A full length image of a distant tall building can definitely
be seen by using
(a) a concave mirror
(b) a convex mirror
(c) a plane
mirror
(d) both concave as well as plane mirror
Answer
Answer: (b) a convex mirror
12.
In torches, search lights and headlights of vehicles the bulb
is placed
(a) between the pole and the focus of the reflector
(b) very
near to the focus of the reflector
(c) between the focus and centre of
curvature of the reflector
(d) at the centre of curvature of the
reflector
Answer
Answer: (b) very near to the focus of the reflector
13.
The laws of reflection hold good for
(a) plane mirror
only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors
irrespective of their shape
Answer
Answer: (d) all mirrors irrespective of their shape
14.
The path of a ray of light coming from air passing through a
rectangular glass slab traced by four students are shown as A, B, C and D in
figure. Which one of them is correct?
(a) A
(b) B
(c) C
(d) D
Answer
Answer: (b) B
15.
You are given water, mustard oil, glycerine and kerosene. In
which of these media a ray of light incident obliquely at same angle would bend
the most?
(a) Kerosene
(b) Water
(c) Mustard oil
(d)
Glycerine
Answer
Answer: (d) Glycerine
16.
Which of the following ray diagrams is correct for the ray of
light incident on a concave mirror as shown in figure?
(a) Fig. A
(b) Fig. B
(c) Fig. C
(d) Fig. D
Answer
Answer: (d) Fig. D
17.
Which of the following ray diagrams is correct for the ray of
light incident on a lens shown in figure?
(a) Fig. A
(b) Fig. B
(c) Fig. C
(d) Fig. D
Answer
Answer: (a) Fig. A
18.
A child is standing in front of a magic mirror. She finds the
image of her head bigger, the middle portion of her body of the same size and
that of the legs smaller. The following is the order of combinations for the
magic mirror from the top.
(a) Plane, convex and concave
(b) Convex,
concave and plane
(c) Concave, plane and convex
(d) Convex, plane and
concave
Answer
Answer: (c) Concave, plane and convex
19.
In which of the following, the image of an object placed at
infinity will be highly diminished and point sized?
(a) Concave mirror
only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror,
convex mirror, concave lens and convex lens
Answer
Answer: (d) Concave mirror, convex mirror, concave lens and convex lens
20.
Light travel fastest in
(a) Water
(b) Air
(c)
Glass
(d) Diamond
Answer
Answer: (b) Air
21.
A student used a device (X) to obtain/focus the image of a
well illuminated distant building on a screen (S) as shown alongside in the
diagram. Select the correct statement about the device (X).
(a) This device is a concave lens of focal length 8 cm.
(b) This device is a
convex mirror of focal length 8 cm.
(c) This device is a convex lens of focal
length 4 cm.
(d) This device is a convex lens of focal length 8
cm.
Answer
Answer: (d) This device is a convex lens of focal length 8 cm.
22.
A student obtains a sharp image of the distant window (W) of
the school laboratory on the screen (S) using the given concave mirror (M) to
determine its focal length. Which of the following distances should he measure
to get the focal length of the mirror?
(a) MW
(b) MS
(c) SW
(d) MW- WS
Answer
Answer: (b) MS
23.
The mirror having reflection surface curved outward
(a)
plane mirror
(b) concave mirror
(c) convex mirror
(d) cylindrical
mirror
Answer
Answer: (c) convex mirror
24.
The mirror having reflecting surface curved inwards
(a)
plane mirror
(b) convex mirror
(c) cylindrical mirror
(d) concave
mirror
Answer
Answer: (d) concave mirror
25.
The mirror used as rear-view mirror in vehicles
(a) convex
mirror
(b) plane mirror
(c) cylindrical mirror
(d) concave
mirror
Answer
Answer: (a) convex mirror
26.
The deviation of light ray from its path when it travels from
one transparent medium to another transparent medium is called
(a)
reflection
(b) refraction
(c) dispersion
(d)
scattering
Answer
Answer: (b) refraction
27.
Convex lens is also known as
(a) converging lens
(b)
diverging lens
(c) radial lens
(d) axial lens
Answer
Answer: (a) converging lens
28.
The image which is formed behind the mirror
(a) real
image
(b) virtual image
(c) blue image
(d) partial
image
Answer
Answer: (b) virtual image