MCQ Class 10 Science Chapter 9 Light-Reflection and Refraction

MCQ’s For All Chapters – Science Class 10th

1. An object 4 cm tall is placed in front of a convex lens. It produces an image 3 cm tall. What is the magnification of the lens?

0.75

1.33

Your comments:

Question 1 of 30

2. Which kind of a mirror is used to see the enlarged image of the object?

Convex mirror

Plano-concave mirror

Concave mirror

Plane mirror

Your comments:

Question 2 of 30

3. After reflection through a concave mirror, rays of light

Meet

Appear to meet

Never meet

None of the above

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Question 3 of 30

4. Whenever light goes from one medium to another, the characteristic that does not change is:

Velocity

Frequency

Colour

Wavelength

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Question 4 of 30

5. The lens which is used to correct myopia (shortsightedness) is

Both convex and concave

Concave lens

Converging lens

Convex Lens

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Question 5 of 30

6. If the focal length of a spherical mirror is - 20 cm, then it is a:

Double convex mirror

Concave mirror

Convex mirror

Plane mirror

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Question 6 of 30

7. A concave mirror of focal length 'f' produces an image 'n' times farther than the object. If the image is real, then the distance of the object from the mirror is:

(n-1)f / n

(n+1) f

(n+1)f/ n

(n-1)f

Your comments:

Question 7 of 30

8. According to the new cartesian sign convention,

Focal length of both, convex and concave mirror is positive

Focal length of both, convex and concave mirror is negative.

Focal length of convex mirror is negative and that of concave mirror is positive.

Focal length of convex mirror is positive and of concave mirror is negative

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Question 8 of 30

9. Which lens always forms a virtual image?

Concave lens

Convex lens

Converging lens

Both convex and concave

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Question 9 of 30

10. The power of a lens of focal length 50 cm is

0.5 D

10.5 cm

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Question 10 of 30

11. After refraction through a rectangular glass slab the emergent ray is

collinear to incident ray.

parallel to incident ray.

perpendicular to incident ray.

totally internally reflected.

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Question 11 of 30

12. Which one of the following materials cannot be used to make lens?

Plastic

Water

Glass

Clay

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Question 12 of 30

13. Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is

5.5 x 10¹⁰ ms^-1

4 x 10⁸ ms^-1

6.25 x 10⁷ ms^-1

2 x 10⁸ ms^-1

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Question 13 of 30

14. In order to get a diminished and virtual image, the object can be placed anywhere in front of a:

Concave mirror

Convex mirror

Plane mirror

all these mirrors

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Question 14 of 30

15. The combination of a convex lens of power +2D and a concave lens of power -2D, acts as a

bi-focal lens of power 0 D

prism

convex lens of power 0 D.

glass slab

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Question 15 of 30

16. The maximum image distance in case of a concave lens of focal length 'f' is :

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Question 16 of 30

17. The mirror used as rear view mirror is

Convex

Concave

Plano concave

Plano convex

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Question 17 of 30

18. Drop of water behaves likes a

Diverging lens

Concave lens

Convex lens

Both convex and concave

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Question 18 of 30

19. The bending of light ray due to change in its speed is

reflection.

absorption.

refraction.

diffraction.

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Question 19 of 30

20. An object is placed 60 cm in front of a concave mirror. The real image formed by the mirror is located 30 cm in front of the mirror. What is the object's magnification?

+0.5

-0.5

-2

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Question 20 of 30

21. What will happen when a ray enters from glass to air medium?

Follows its original path.

It bends towards the normal.

It bends away from normal.

Totally reflected from air surface.

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Question 21 of 30

22. If the image formed by a concave mirror is observed to be virtual, erect and larger than the object then the position of the object will be

between the focus and centre of curvature

at centre of curvature

between the pole of the mirror and its principal focus

between infinity and centre of curvature

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Question 22 of 30

23. The distance at which an object should be placed from a thin convex lens of focal length 10 cm to obtain a virtual image of double of its size is

5.5 cm

-10cm

15 cm

- 5 cm

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Question 23 of 30

24. A big shinny spoon is a good example of

Concave mirror

Spherical mirror

Convex mirror

Plane mirror

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Question 24 of 30

25. If h' is the size of the image and h the size of object .The magnification for a spherical mirror is

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Question 25 of 30

26. The concave mirrors are used in

Reflecting telescopes

Magic lanterns

Cinema projectors

All the above

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Question 26 of 30

27. To determine the focal length of convex lens by obtaining a sharp image of a distant object we generally follow the following steps which are not in proper sequence.
(a) Hold the lens between the object and the screen
(b) Measure the distance between the lens and the screen
(c) Select a well lit distant object
(d) Adjust the position of the lens to form a sharp image
The correct sequence will be:

a, c, d, b

c, d, a, b

c, a, d, b

c, d, b, a

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Question 27 of 30

28. When an object is placed at a distance of 5 cm in front of a convex mirror of focal length 10 cm, then:

v = - 3.3cm

v = + 33cm

v = - 33cm

v = + 3.3cm

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Question 28 of 30

29. For spherical mirrors

Both laws of reflection are valid

Only first law is valid

Only second law is valid

Laws of reflection are not valid

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Question 29 of 30

30. The image formed by a convex lens is virtual when

Object lie between F and O

Object lie between 2F and F

Object is at focus

Object is at infinity

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Question 30 of 30

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