CBSE Class 10 Science Light reflection and refraction Sure Shot Questions B

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CHAPTER - 10

LIGHT – REFLECTION AND REFRACTION

ASSIGNMENT QUESTIONS SET – 2

MULTIPLE CHOICE QUESTIONS

1. 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

2. 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) – 40 cm (d) – 60 cm

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

4. The below Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is

(a) √3/√2

(b)√ 2/√3

(c) 1/√2

(d) √2

5. Which of the following statements is true?

(a) A convex lens has 4 dioptre power having a focal length 0.25 m

(b) A convex lens has –4 dioptre power having a focal length 0.25 m

(c) A concave lens has 4 dioptre power having a focal length 0.25 m

(d) A concave lens has –4 dioptre power having a focal length 0.25 m

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

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