MULTIPLE
CHOICE QUESTIONS
CBSE TERM 1 PRACTICE QUESTIONS
CLASS X
TERM 1
Chapter :
Light – Reflection and Refraction
(To download the MCQ pdf - click the link MCQ - Light: reflection and refraction)
To check your score in MCQs, attempt the online test - Online Test -Light reflection and refraction
MULTIPLE
CHOICE QUESTIONS
CBSE TERM 1 PRACTICE QUESTIONS
CLASS X
TERM 1
Chapter :
Light – Reflection and Refraction
(To download the MCQ pdf - click the link MCQ - Light: reflection and refraction)
To check your score in MCQs, attempt online test - Online Test -Light reflection and refraction
1. A teacher set up the stand carrying a convex lens of
focal length 15 cm at 20.5 cm on the optical bench. She asked four students A,
B, C and D to suggest the position of the screen on the optical bench so that a
distinct image of a distant tree is obtained immediately on it.
The positions of screen suggested by each of them were as-
A à at 35.5 cm
B à at 5.5 cm
C à at 50.5 cm
D à at 7.5 cm.
Correct position of the screen was suggested by
(a) student A
(b) student B
(c) student C
(d) student D
2. For determining focal length of a concave mirror, a
teacher asks her students to Identify concave mirror from a few mirrors lying
on the table. The reason given by A, B, C and D for picking up the right mirror
is
Aà the mirror is depressed
at the centre and self-image formed is enlarged and erect.
Bà the mirror is raised at the centre and self-image formed is smaller and
erect
Cà the mirror is plane all
over and self-image is of same size
Dà the mirror is depressed at the centre and self-image formed is enlarged
and inverted.
Correct reason is given by
(a) student A
(b) student B
(c) student C
(d) student D
A àImage is virtual, smaller and erect
B àImage is real, smaller and erect
C àImage is virtual, enlarged and inverted
D àImage is real, smaller
and inverted.
Which student has given the correct
description of the nature and size of the image?
(a) student A
(b) student B
(c) student C
(d) student D
4. 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
5. Under
which of the following conditions a concave mirror can form an image on a
screen 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
6. 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
7. Rays
from Sun converge at a point 15 cm in front of a concave mirror. Where an
object should 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 30 cm in front of the
mirror
(d) more than 30 cm in front of the mirror
8. 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
9. What
is the relation between radius of curvature and focal length of spherical
mirror?
(a) F = 2 R
(b) R = 2 f
(c) R + f = 2
(d) R x f = 2
10. Which
mirror that can give an erect and enlarged image of an object.
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Rear-view mirror
11. Which one of the
following is a correct statement?
(a) Real image can be obtained by a convex mirror.
(b) Real image cannot be projected on a
screen.
(c) The erect image obtained by a concave mirror is real in
nature.
(d) An inverted real image of the same size is obtained when an object is placed at centre of curvature of a concave mirror.
12. The main advantage of
using a convex mirror as a rear-view mirror in vehicles is
(a)
It provides
a smaller field of view of the traffic behind the vehicle.
(b) it provides a beautiful view of the traffic behind the
vehicle.
(c)
It provides
a wider field of view of the traffic behind the vehicle.
(d)
it shows
objects in the mirror which are closer than they appear.
13. What is the difference
between the virtual image formed by a concave mirror and that formed by a
convex mirror?
(a) virtual image formed by a concave mirror is
inverted and that formed by a convex mirror is erect.
(b) virtual image formed by a concave mirror is enlarged and
that formed by a convex mirror is diminished.
(c) Virtual image formed by a concave mirror is diminished
and that formed by a convex mirror is enlarged.
(d) virtual image formed by a concave mirror is erect and
that formed by a convex mirror is inverted.
14. A student conducts an activity using a
concave mirror with focal length of 10 cm. He
placed the object 15 cm from the mirror.
Where is the image likely to form?
(a)
at 6cm behind the mirror
(b) at 30cm
behind the mirror
(c)
at 6 cm in front of the mirror
(d) at 30 cm in front of the mirror
15. If the image of an object is erect,
small, and virtual, the mirror is
(a) Spherical
mirror
(b) Convex mirror
(c)
Concave
mirror
(d)
Plane
mirror
16. Convex mirror has reflecting surface
(a) Outward and its center of
curvature is behind the mirror.
(b) Inwards and its center of curvature
is behind the mirror.
(c)
Outward
and its center of curvature is in front of the mirror.
(d) Inwards and its center of curvature
is in front of the mirror.
17. The focal length of a spherical mirror
is 15 cm, its radius of curvature will be ---
(a)
30
cm
(b)
15 cm
(c)
10 cm
(d)
7.5 cm
18. A student wants to project the image
of a candle flame on a screen 80 cm in front of a mirror by keeping the candle
flame at a distance of 30 cm from its pole. Find the distance between object
and the image.
(a) 80 cm
(b)
30 cm
(c)
110 cm
(d)
50 cm
19. The magnification produced by a
spherical mirror is -1/3. Analyzing this value, state the type of mirror and
the nature and relative size of the image.
(a) convex
mirror; virtual, erect and diminished image
(b)
concave mirror; real, inverted and enlarged image
(c)
concave mirror; real inverted and diminished image
(d)
convex mirror; real, inverted and diminished image
20. What
is the minimum distance between an object and its real image in the case of a
concave mirror?
(a) infinity
(b)
equal to the focal length of the concave mirror
(c)
Zero
(d)
equal to twice the focal length of the concave mirror
21. The image of an object
formed by a mirror is real, inverted and is of magnification
(a) at 20cm from the pole of the convex mirror
(b)
at 40 cm from the pole of the convex mirror
(c)
at 40 cm from the pole of the concave mirror
(d)
at 20 cm from the pole of the concave mirror
22. 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
23. An object 20 cm from a
spherical mirror gives rise to a virtual image 15 cm behind the mirror.
Determine the magnification of the image and the type of mirror used.
(a) m = 0.75, concave mirror
(b)
m = – 0.75 convex mirror
(c)
(d)
24. 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
25. Rekha
placed a juice bottle at a distance of 20 cm in front of a convex mirror which
has a focal length of 20 cm. Where is the image likely to form?
(a)
at focus behind the mirror
(b)
at focus in front ofthe mirror
(c)
at a distance of 10 cm behind themirror
(d)
at a distance of 10 cm in front of the mirror
26. A
student conducts an activity using a flask of height 15 cm and a concave
mirror. He finds that an erect image formed is 45 cm in height. What is the
magnification of the image?
(a)
– 3 times
(b)
– ⅓ times
(c) ⅓ times
(d)
3 times
27. An
incident ray makes an angle of 35° with the surface of a plane mirror. What is
the angle of reflection ?
(a)
35°
(b)
90°
(c)
45°
(d)
55°
28. Neha
is observing her image in a plane mirror. The distance between the mirror and
her image is 5 m. If she moves 1 m towards the mirror, then the distance
between Neha and her image will be
(a)
5 m
(b)
8 m
(c)
10 m
(d)
4 m
29. The
rear-view mirror of a car is a plane mirror. A driver is reversing his car at a
speed of 3 m/s. The driver sees in his rear-view mirror, the image of a truck
parked behind his car. The speed at which the image of the truck appears to
approach the driver will be
(a)
3 m/s
(b)
0 m/s
(c)
6 m/s
(d)
1 m/s
30. A
ray of light is incident normally on a plane mirror. The correct relation and
value of angle of incidence (i) and angle of reflection (r) is
(a)
i = r = 90°
(b)
i = r = 0°
(c)
i = r = 45°
(d)
i > r > 0°
31. What
kind of mirror is required for obtaining a virtual image of the same size as
the object ?
(a)
Concave mirror
(b)
Convex mirror
(c)
Plane mirror
(d)
Spherical mirrors
32. A
diverging mirror is a
(a)
Concave mirror
(b)
Convex mirror
(c)
Plane mirror
(d)
Shaving mirror
33. A
communications satellite in orbit sends a parallel beam of signals down to
earth. If these signals obey the same laws of reflection as light and are to be
focussed onto a small receiving aerial, what should be the best shape of the
metal ‘dish’ used to collect them ?
(a)
A flat surface of metal
(b)
A part of the spherical shape with its concave side facing the signals
(c) A part of the spherical shape with
its convex side facing the signals
(d)
Metal tubes
34. When
a spherical mirror is held towards the sun and its sharp image is formed on a
piece of carbon paper for some time, a hole is burnt in the carbon paper.
At
which point of the spherical mirror the carbon paper is placed ?
What
is the nature of the spherical mirror?
(a)
At point C; Concave mirror
(b)
At point F; Concave mirror
(c)
At point C; Convex mirror
(d)
At point F; Convex mirror
35. We
wish to obtain an erect image of an object using a concave mirror of focal
length 20 cm. What should be the range of distance of the object from the
mirror ?
(a)
At any distance which is less than 20 cm
(b)
At any distance from the mirror
(c)
At any distance which is less than 10 cm
(d)
At any distance between 20 cm to 40 cm
36. The
image formed by a concave mirror is seen to be virtual, erect and larger than
the object. The position of the object must then be :
(a)
between the focus and centre of curvature.
(b)
at the centre of curvature
(c)
beyond the centre of curvature.
(d)
between the pole of the mirror and its focus.
37. A
concave mirror has a focal length of 32 cm. Where should an object be placed in
front of this concave mirror so as to obtain an image which is real, inverted
and same size as the object ?
(a)
32 cm
(b)
16 cm
(c)
64 cm
(d)
48 cm
38. An
object is placed at the following distances from a concave mirror of focal
length 10 cm :
(i)
8 cm (ii) 15 cm (iii) 20 cm (iv) 25 cm
Which
position of the object will produce a diminished image ?
(a)
8 cm
(b)
15 cm
(c)
20 cm
(d)
25 cm
39. The
angle of incidence for a ray of light passing through the centre of curvature
of a concave mirror is:
(a)
45°
(b)
90°
(c)
0°
(d)
180°
40. The
focal length of a small concave mirror is 2.1 cm. In order to use this concave
mirror as a dentist’s mirror, the distance of tooth from the mirror should be :
(a)
1.9 cm
(b)
2.1 cm
(c)
2.2 cm
(d)
4.2 cm
41. An
object is 100 mm in front of a concave mirror which produces an upright image
(erect image). The radius of curvature of the mirror is :
(a)
less than 100 mm
(b)
between 100 mm and 200 mm
(c)
exactly 200 mm
(d)
more than 200 mm
42. One
of the following does not apply to a concave mirror. This is :
(a)
focal length is negative
(b)
image distance can be positive or negative
(c)
image distance is always positive
(d)
height of image can be positive or negative
43. The
magnification produced by a plane mirror is +1. The nature and relative size of
the image is:
(a)
Real, inverted; same size
(b)
Virtual, erect; Same size
(c)
Real, inverted; Magnified
(d)
Virtual, erect; diminished
44. The
correct relationship between object’s distance, image’s distance and focal
length of spherical mirror is
(a) 1/f = 1/v - 1/u
(b) 1/f = 1/u - 1/v
(c) 1/v = 1/f - 1/u
(d) 1/u = 1/v + 1/f
45. In
order to obtain a magnification of, –1.5 with a concave mirror of focal length
12 cm, the object will have to be placed at a distance :
(a)
between 6 cm and 12 cm
(b)
beyond 24 cm
(c)
between 12 cm and 24 cm
(d)
between 48 cm and 32 cm
46. An
object is placed at a very large distance in front of a concave mirror of
radius of curvature 32 cm. The image will be formed in front of the mirror at a
distance of :
(a)
32 cm
(b)
Approximately close to 16 cm
(c)
20 cm
(d)
64 cm
47. Magnification
produced by a plane mirror is :
(a)
Less than 1
(b)
Equal to 1
(c)
Greater than 1
(d)
Zero
48. If
a magnification of, –1 is to be obtained by using a converging mirror, then the
object has to be placed :
(a)
between pole and focus
(b)
at the centre of curvature
(c)
beyond the centre of curvature
(d)
at infinity
49. Which
of the following mirror has wider field of view?
(a)
Concave mirror
(b)
Convex mirror
(c)
Plane mirror
(d)
Shaving mirror
50. A
concave mirror cannot be used as :
(a)
a magnifying mirror
(b)
a torch reflector
(c)
a dentist’s mirror
(d)
a rear-view mirror
