Hello guys, welcome to your own blog 'Pareeksha Time'. In this article, you will read CBSE Class 10 Science MCQs of Chapter 10. You will read Light Reflection and Refraction MCQs for Term-1 Board Exams 2021-22.
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Light-Reflection and Refraction MCQs | MCQ Questions for Class 10 Physics Light Reflection and Refraction:-
1. For a real object, which of the following can produce a real image?
(a) Plane mirror
(b) Concave mirror
(c) Concave lens
(d) Convex mirror
Answer: (b) Concave mirror
2. 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: (a) Concave mirror as well as convex lens
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: (c) When object is placed between the focus and centre of curvature
4. 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) 30°
(b) 45°
(c) 60°
(d) 90°
Answer: (c) 60°
5. 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: (b) A Convex mirror
6. Which of the following mirror is used by a dentist to examine a small cavity?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Combination of Convex and Concave mirror
Answer: (c) Concave mirror
7. 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: (d) Glycerine
8. 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: (c) At C
9. 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: (a) 4 ms⁻¹
10. If a man’s face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be:
(a) 75 cm
(b) 25 cm
(c) 15 cm
(d) 60 cm
Answer: (a) 75 cm
11. 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: (a) Fig. A
12. Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:
(a) Mirror A is Concave and Mirror B is Convex
(b) Mirror A is Plane and Mirror B is Concave
(c) Mirror A is Concave and Mirror B is Plane
(d) Mirror A is Convex and Mirror B is Concave
Answer: (c) Mirror A is Concave and mirror B is Plane
13. 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: (d) None of these
14. 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: (d) Fig. D
15. An object which has higher refractive index is called:
(a) Optically rarer
(b) Optically denser
(c) Optical density
(d) Refractive index
Answer: (b) Optically denser
16. The refractive index of transparent medium is greater than one because:
(a) Speed of light in vacuum < Speed of light in tansparent medium
(b) Speed of light in vacuum > Speed of light in tansparent medium
(c) Speed flight in vacuum = Speed of light in tansparent medium
(d) Frequency of light wave changes when it moves from rarer to denser medium
Answer: (b) Speed of light in vacuum > Speed of light in tansparent medium
17. 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:
(b) Less than unity
(c) Equal to unity
(d) Zero
Answer: (a) Greater than unity
18. The mirror having reflection surface curved outward:
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Cylindrical mirror
Answer: (c) Convex mirror
19. If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:
(a) 20 cm
(b) 18 cm
(c) 10 cm
(d) 5 cm
Answer: (c) 10 cm
20. Large number of thin stripes of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be:
(a) A zebra of black stripes
(b) A horse of black stripes
(c) A horse of less brightness
(d) A zebra of less brightness
Answer: (c) a horse of less brightness
21. A student traces the path of a ray of light passing through a rectangular slab for three different values of angle of incidence (∠i ) namely 30°, 45° and 60°. He extends the direction of incident ray by a dotted line and measures the perpendicular distance ‘l’ between the extended incident ray and the emergent ray.
He will observe that:
(a) ‘l’ keeps on increasing with increase in angle of incidence
(b) ‘l’ keeps on decreasing with increase in angle of incidence
(c) ‘l’ remains the same for all three angles of incidence
(d) ‘l’ is the maximum for ∠i = 45° and is less than this value for ∠i = 30° and ∠i = 60°
Answer: (a) ‘l’ keeps on increasing with increase in angle of incidence
22. Convex lens is also known as:
(a) Converging lens
(b) Diverging lens
(c) Radial lens
(d) Axial lens
Answer: (a) Converging lens
23. 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: (a) A Rectangular glass slab
24. If the power of a lens is – 2 D, what is its focal length?
(a) +50 cm
(b) -100 cm
(c) -50 cm
(d) +100 cm
Answer: (c) -50 cm
25. 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: (d) This device is a convex lens of focal length 8 cm.
26. Refractive index:
(a) Depends on the wavelength of light used to measure
(b) Is actual property of the substance
(c) Depends on the angle of incidence
(d) None of these
Answer: (a) Depends on the wavelength of light used to measure
27. The focal length of a plano-convex lens having a radius of curvature of 10 cm for convex surface and a refractive index of 1.5 will be :
(a) 20 cm
(b) 15 cm
(c) 10 cm
(d) 5 cm
Answer: (a) 20 cm
28. A convex lens of power P is immersed in a water . How will its power change ?
(a) Increases
(b) Remain unchanged
(c) Decreases
(d) Increases for red colour and decreases for blue colour
Answer: (c) Decreases
So guys here comes end. In this article, I shared 25+ Light- Reflection and Refraction MCQs of CBSE Class 10 Physics MCQs 2021-22.
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