Chapter 14: Light — Online MCQ Test
SCIENCE · Samacheer Kalvi 7th · Tamil Nadu State Board
Practice Chapter 14: Light with a free chapter-wise online MCQ test.
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.
Chapter 14: Light — Important Questions & Answers
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.
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.
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.
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.
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.
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.