Class 10 for MCQ Science Chapter 10 Light- Reflection and Refraction
Question 1:
An object is placed 20 cm in front of a plane mirror.
The mirror is moved 2 cm towards the object. The distance between the positions of
the original and final images seen in the mirror is:
(a) 2 cm
(b) 4 cm
(c)
10 cm
(d) 22 cm
Answer
Answer: (a) 4 cm
Question 2:
Focal length of plane mirror
is
(a) At
infinity
(b)
Zero
(c)
Negative
(d) None of these
Answer
Answer: (a) At infinity
Question 3:
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
Question 4:
In order to obtain a magnification of, -0.6 (minus
0.6) with a concave mirror, the object must be placed:
(a) At the focus
(b)
Between pole and focus
(c) Between focus and center of curvature
(d) Beyond
the center of curvature
Answer
Answer: (d) Beyond the center of curvature
Question 5:
A ray of light that strikes a plane mirror PQ at an
angle of incidence of 30o, is reflected from the plane mirror and then
strikes a second plane mirror QR placed at right angles to the first mirror. The
angle of reflection at the second mirror is:
(a) 30o
(b)
45o
(c) 60o
(d) 90o
Answer
Answer: (c) 60o
Question 6:
Image formed by plane mirror
is
(a) Real and
erect
(b) Real and
inverted
(c) Virtual and
erect
(d) Virtual and
inverted
Answer
Answer: (c) Virtual and erect
Question 7:
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
Question 8:
A man runs towards the plane mirror at 2 m/s. The
relative speed of his image with respect to him will be:
(a) 4 ms⁻¹
(b)
2 ms⁻¹
(c) 8 ms⁻¹
(d) 10 ms⁻¹
Answer
Answer: (a) 4 ms⁻¹
Question 9:
An object is placed at 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
Answer
Answer: (d) More than 200 mm
Question 10:
A concave mirror gives real, inverted and same size
image if the object is
placed
(a) At
F
(b) At
infinity
(c) At
C
(d) Beyond C
Answer
Answer: (c)