Chapter Exam

Chapter 14: Light — Online MCQ Test

Q: What is the phenomenon in which light bounces back from a shiny surface called?

Answer: B. Reflection — When light falls on a surface and returns back, it is called reflection. Mirrors work based on this principle.

Q: Which of the following is a source of light?

Answer: C. Sun — The Sun gives out its own light, so it is a natural source of light. The Moon only reflects sunlight.

Q: When light travels from air into water, it bends because of:

Answer: B. Refraction — Refraction is the bending of light when it passes from one medium to another. Water and air are different media.

Q: Why does a straw kept in a glass of water look broken at the surface?

Answer: B. Because of refraction at the water-air boundary — Light from the straw bends when it moves from water to air. This makes the straw appear displaced or broken.

Q: Which statement is correct about a concave mirror used in a torch?

Answer: C. It helps produce a parallel beam of light — A concave mirror can reflect light from the bulb into a parallel beam when the bulb is placed near its focus. This is why it is used in torches and vehicle headlights.

SCIENCE · Samacheer Kalvi 7th · Tamil Nadu State Board

Practice Chapter 14: Light with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 7th SCIENCE. This chapter covers: Reflection refraction lens mirror Properties of light including reflection refraction and optical devices. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 14: Light — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 7th SCIENCE — Chapter 14: Light, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the phenomenon in which light bounces back from a shiny surface called?

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

Answer: B. Reflection
When light falls on a surface and returns back, it is called reflection. Mirrors work based on this principle.

Which of the following is a source of light?

A. Moon
B. Book
C. Sun ✓
D. Table

Answer: C. Sun
The Sun gives out its own light, so it is a natural source of light. The Moon only reflects sunlight.

When light travels from air into water, it bends because of:

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

Answer: B. Refraction
Refraction is the bending of light when it passes from one medium to another. Water and air are different media.

Why does a straw kept in a glass of water look broken at the surface?

A. Because water absorbs the straw's light
B. Because of refraction at the water-air boundary ✓
C. Because the straw gives out light
D. Because of reflection from the glass

Answer: B. Because of refraction at the water-air boundary
Light from the straw bends when it moves from water to air. This makes the straw appear displaced or broken.

Which statement is correct about a concave mirror used in a torch?

A. It always forms a virtual image of the bulb
B. It spreads light rays in all directions
C. It helps produce a parallel beam of light ✓
D. It works only by absorbing light

Answer: C. It helps produce a parallel beam of light
A concave mirror can reflect light from the bulb into a parallel beam when the bulb is placed near its focus. This is why it is used in torches and vehicle headlights.