#### Optics Model Question Paper

10th Standard

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Science

Time : 01:30:00 Hrs
Total Marks : 50
5 x 1 = 5
1. The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in

(a)

A

(b)

B

(c)

C

(d)

D

2. Magnification of a convex lens is

(a)

Positive

(b)

negative

(c)

either positive or negative

(d)

zero

3. If VB, VG, VR be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?

(a)

VB = VG = VR

(b)

VB > VG >VR

(c)

VB < VG < VR

(d)

VB < VG > VR

4. The path of light is ______

(a)

rays

(b)

point

(c)

lines

(d)

beam

5. Violet and red light ______ wavelengths.

(a)

lowest, highest

(b)

highest, lowest

(c)

same

(d)

standard

6. 5 x 1 = 5
7. The path of the light is called as_____________

()

ray

8. If the energy of incident beam and the scattered beam are same, then the scattering of light is called as________scattering.

()

elastic

9. Amount of light entering into the eye is controlled by________

()

Iris

10. Angle of refraction is _____ for red and _____ for violet.

()

smallest, highest

11. Unit of power is _____

()

dioptre

12. 5 x 1 = 5
13. Retina

14. (1)

Scattering of light

15. Ciliary muscles

16. (2)

Power accommodation

17. Hypermetropia

18. (3)

Screen of the eye

19. Object which give out light

20. (4)

source

21. Blue colour of the sea

22. (5)

near point moves away

3 x 2 = 6
23. Assertion : The air bubble shines in water
Reason : Air bubble in water shines due to refraction of light.
Codes:
(a) Both assertion and reason are true and reason is correct explanation of assertion
(b) Both assertion and reason are true but reason is not the correct explanation of assertion
(c). Assertion is true but reason is false
(d) Both assertion and reason are false

24. Assertion : During sun set, sun appears red.
Reason : Scattering of light is directly proportional to the wavelength.
Codes:
(a) Both assertion and reason are true and reason is correct explanation of assertion
(b) Both assertion and reason are true but reason is not the correct explanation of assertion
(c). Assertion is true but reason is false
(d) Both assertion and reason are false

25. Assertion : The cloud in sky generally appears white.
Reason : Due to diffraction clouds [The light is scattered by the water droplets inside the cloud.
Codes:
(a) Both assertion and reason are true and reason is correct explanation of assertion
(b) Both assertion and reason are true but reason is not the correct explanation of assertion
(c) Assertion is true but reason is false
(d) Both assertion and reason are false

26. 5 x 2 = 10
27. What is refractive index?

28. Differentiate convex lens and concave lens

29. What are the causes of ‘Myopia’?

30. Why are traffic signals red in colour?

31. What is 'Presbyopia'?

32. 3 x 4 = 12
33. State the laws of refraction.

34. Explain the Sign Conventions of lenses.

35. Explain the types of Telescope.

36. 1 x 7 = 7
37. List any five properties of light.