MCQ Practice – Class 6 to 10

Q1. The apparent flattening of the Sun at sunrise and sunset is due to:

A. Interference B. Reflection C. Dispersion D. Atmospheric refraction

Q2. Which equation represents Snell’s Law?

A. n2 sin i = n1 sin r B. F = ma C. n1/n2 = v1/v2 D. V = IR

Q3. What happens to the speed of light in denser medium?

A. Becomes zero B. Increases C. Remains same D. Decreases

Q4. The refractive index of vacuum is:

B. Infinity C. 2 D. 1

Q5. Refraction at plane surfaces follows:

A. Archimedes’ Principle B. Snell’s Law C. Newton’s Law D. Law of floatation

Q6. The formula for refractive index using speed is:

A. n = 1/v B. n = c×v C. n = v/c D. n = c/v

Q7. The focal length of a concave lens is:

A. Zero B. Infinite C. Positive D. Negative

Q8. Which lens converges light rays?

A. Convex lens B. Concave mirror C. Plane mirror D. Concave lens

Q9. A fish in water appears ___ than its actual depth.

A. Higher B. Blurred C. Deeper D. Transparent

Q10. The focal length of a convex lens is:

A. Positive B. Infinite C. Zero D. Negative

Quiz – Refraction of Light