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Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 5 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Coming back of light rays to the same medium when they fall on a body is known as

Correct Answer: B) Reflection.

2. We get a virtual image with a concave mirror when the object is placed between

Correct Answer: A) Pole and Focus.

3. What is used in spectacles?

Correct Answer: C) Convex lens or concave lens.

4. A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black.

Correct Answer: C) The intensity of the image will decrease.

5. Refraction is when light .....

Correct Answer: C) Bends.

6. David is observing his image in a plane mirror. The distance between the mirror and his image is 5m. If he moves 1m towards the mirror, then the distance between David and his image will be-

Correct Answer: D) 8 m.

7. Power of a lens is the ..... of its focal length.

Correct Answer: B) Reciprocal.

8. Which mirror can produce a virtual, erect and magnified image of an object?

Correct Answer: D) Concave mirror.

9. A person standing in front of a mirror finds his image larger than himself. This shows that mirror is convex in nature.

Correct Answer: B) False.

10. When a ray of light enters from one medium to another having different optical densities it bends. beacuse

Correct Answer: B) Speed of light changes.

11. Objects that reflect well are

Correct Answer: B) Smooth, shiny surfaces.

12. A convex lens of focal length 15 cm produces a magnification of + 4. The object is placed:(a) at a distance of 15 cm (b) between 15 cm and 30 cm (c) at less than 15 cm (d) beyond 30 cm

Correct Answer: C) C.

13. A divergent lens will produce

Correct Answer: B) Always virtual image.

14. When the object is placed between f and 2f of a convex lens, the image formed is

Correct Answer: C) Beyond 2f.

15. Refractive index of diamond with respect to glass is 1.6. If the absolute refractive index of glass is 1.5, then the absolute refractive index of diamond is

Correct Answer: B) 2.4.

16. Which of the following statements is not true about Laws of Reflection?

Correct Answer: D) Laws of Reflection can be applied to any surface.

17. A child walks towards a fixed plane mirror at a speed of 5 km h-1. The velocity of the image with respect to mirror is-

Correct Answer: B) -5 km h-1.

18. The image formed by a convex lens can be

Correct Answer: D) Virtual and magnified.

19. Which of these relations does not pertain to spherical mirrors?

Correct Answer: B) $\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$.

20. The image formed by a concave mirror is real, invertedand of the same size as that of the object. The position of the object shouldbe-

Correct Answer: C) At C.

21. Bending of light when it passes from one medium to another is called

Correct Answer: C) Refraction.

22. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens, if image size is equal to the object size? Also, find the power of the lens.

Correct Answer: C) 4e.

23. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be

Correct Answer: C) Either plane or convex.

24. Linear Magnification Produced By A Concave Mirror May Be:

Correct Answer: C) Less than 1, more than 1 or equal to 1.

25. A10 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

Correct Answer: B) -20 cm.

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