Class 10 for MCQ Science Chapter 10 Light- Reflection and Refraction
Question 11:
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
Question 12:
A concave lens form the image of an object which is
:
(a) Virtual inverted and diminished
(b) Virtual upright and
diminished
(c) Virtual inverted and enlarged
(d) Virtual upright and enlarged
Answer
Answer: (b) Virtual upright and diminished
Question 13:
Which position of the object will produce a
magnified virtual image, if a concave mirror of focal length 15 cm is being
used?
(a) 10 cm
(b) 20 cm
(c) 30 cm
(d) 35 cm
Answer
Answer: (a) 10 cm
Question 14:
Power of the lens is -40, its focal length
is
(a)
4m
(b)
-40m
(c)
-0.25m
(d) -25m
Answer
Answer: (c) -0.25m
Question 15:
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
Question 16:
Which of the given is NOT paired correctly?
(a)
Solar furnace-concave mirror
(b) Rear -view mirror-convex mirror
(c)
Magnifying glass -convex lens
(d) None of these
Answer
Answer: (d) None of these
Question 17:
A concave mirror produces a magnification of +4. The
object is placed:
(a) At the focus
(b) Between focus and centre of
curvature
(c) Between focus and pole
(d) Beyond the centre of curvature
Answer
Answer: (c) Between focus and pole
Question 18:
A concave mirror gives virtual,
refract and enlarged image of the object but image of smaller size than the size of
the object is
(a) At
infinity
(b) Between F and
C
(c) Between P and
F
(d) At E
Answer
Answer: (c) Between P and F
Question 19:
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
Question 20:
An object is approaching a plane mirror at 5 cm/s. A
stationary observer sees the image. At what speed will the image appear to approach
the stationary observer?
(a) 20 cm/s
(b) 10 cm/s
(c) 15 cm/s
(d) 5 cm/s
Answer
Answer: (b) 10 cm/s