Chapter Exam

Chapter-6 Light — Online MCQ Test

Q: What is the phenomenon of bouncing back of light from a smooth surface called?

Answer: B. Reflection — Reflection is the bouncing back of light when it strikes a surface. This is the basic principle behind mirrors.

Q: The angle of incidence is always measured between the incident ray and the:

Answer: C. normal — The angle of incidence is measured from the normal, which is an imaginary line perpendicular to the surface at the point of incidence.

Q: A concave lens is always used because it:

Answer: B. diverges parallel rays — A concave lens spreads out parallel rays of light, so it is called a diverging lens.

Q: A person can see nearby objects clearly but distant objects appear blurred. Which correction is suitable?

Answer: B. Concave lens — This defect is myopia, which is corrected using a concave lens. It diverges the incoming light so the image forms on the retina.

SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-6 Light with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE. This chapter covers: Description Explains reflection refraction lenses image formation and the human eye Keywords Reflection Refraction Lens Human Eye Light. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-6 Light — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE — Chapter-6 Light, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the phenomenon of bouncing back of light from a smooth surface called?

A. Refraction
B. Reflection ✓
C. Dispersion
D. Diffraction

Answer: B. Reflection
Reflection is the bouncing back of light when it strikes a surface. This is the basic principle behind mirrors.

The angle of incidence is always measured between the incident ray and the:

A. mirror surface
B. reflected ray
C. normal ✓
D. refracted ray

Answer: C. normal
The angle of incidence is measured from the normal, which is an imaginary line perpendicular to the surface at the point of incidence.

When light passes from air into water, which of the following changes occurs?

A. Its speed decreases and it bends towards the normal ✓
B. Its speed increases and it bends away from the normal
C. Its speed and direction remain unchanged
D. It becomes completely absorbed

Answer: A. Its speed decreases and it bends towards the normal
In a denser medium like water, light slows down and bends towards the normal. This is refraction.

A concave lens is always used because it:

A. converges parallel rays to a point
B. diverges parallel rays ✓
C. forms real images only
D. produces images on a screen always

Answer: B. diverges parallel rays
A concave lens spreads out parallel rays of light, so it is called a diverging lens.

A person can see nearby objects clearly but distant objects appear blurred. Which correction is suitable?

A. Convex lens
B. Concave lens ✓
C. Plane mirror
D. Thick glass slab

Answer: B. Concave lens
This defect is myopia, which is corrected using a concave lens. It diverges the incoming light so the image forms on the retina.

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