Class 10 - Science

Light Reflection and Refraction Online MCQ Test

Olympiad Level MCQs Also Included

Set-1 Set-2 Set-3 Set-4 Set-5 Set-6 Set-7 Set-8

1. What is the refractive index of a vacuum or air?

(A) 1.00
(B) 0.50
(C) 2.00
(D) 1.33

2. The refractive index of a medium is a measure of:

(A) The speed of light in that medium
(B) The intensity of light in that medium
(C) The ability of the medium to transmit light
(D) The bending of light as it enters the medium

3. Which of the following factors affects the refractive index of a material?

(A) Color of light
(B) Temperature
(C) Thickness of the material
(D) None of the above

4. Snell's Law relates the angles of incidence and refraction to the:

(A) Wavelength of light
(B) Speed of light
(C) Refractive index of the materials
(D) Intensity of light

5. If light travels from a medium with a higher refractive index to a medium with a lower refractive index, what happens to the angle of refraction?

(A) It increases
(B) It remains the same
(C) It decreases
(D) It depends on the color of light

6. A ray of light passes from air into water. If the angle of incidence is 30^o, what is the angle of refraction in water (refractive index of water is 1.33)?

(A) sin⁻¹75⁰
(B) 30^o
(C) sin⁻¹0.375
(D) sin⁻¹45^o

7. The refractive index of a medium is defined as the ratio of:

(A) The speed of light in vacuum to the speed of light in the medium
(B) The wavelength of light in vacuum to the wavelength of light in the medium
(C) The angle of incidence to the angle of refraction
(D) The intensity of light in vacuum to the intensity of light in the medium

8. The refractive index of a medium depends on:

(A) The color of light
(B) The speed of light
(C) The angle of incidence
(D) The wavelength of light

9. The refractive index of a medium is always:

(A) Greater than 1
(B) Less than 1
(C) Equal to 1
(D) Negative

10. Calculate the speed of light in a medium with a refractive index of 1.5, if the speed of light in vacuum is 3 × 10⁸ meters per second.

(A) 2 × 10⁸ m/s
(B) 2.5 × 10⁸ m/s
(C) 1.5 × 10⁸ m/s
(D) 4.5 × 10⁸ m/s