Topic 3: Scattering of Light (Tyndall Effect)

Q1. Scattering of light occurs due to:
A) Reflection
B) Refraction
C) Small particles in medium
D) Diffraction

Answer: C


Q2. Tyndall effect is observed due to:
A) Reflection of light
B) Refraction of light
C) Scattering by colloidal particles
D) Absorption of light

Answer: C


Q3. Which colour of light scatters the most?
A) Red
B) Yellow
C) Green
D) Blue

Answer: D


Q4. The blue colour of the sky is due to:
A) Dispersion
B) Reflection
C) Refraction
D) Scattering

Answer: D


Q5. The reddish appearance of sun at sunrise is due to:
A) Reflection
B) Dispersion
C) Refraction
D) Scattering

Answer: D


Q6. Tyndall effect is NOT observed in:
A) Smoke
B) Fog
C) Colloidal solution
D) True solution

Answer: D


Q7. Which wavelength scatters least?
A) Violet
B) Blue
C) Green
D) Red

Answer: D


Q8. Visibility of light beam in cinema hall is due to:
A) Reflection
B) Tyndall effect
C) Refraction
D) Dispersion

Answer: B

Chapter 14: Dispersion of Light

Topic 3: Scattering of Light – Quick Revision

1. Scattering of Light

Deviation of light from its straight path due to particles.

2. Tyndall Effect

Scattering of light by colloidal particles.

3. Wavelength Dependence

• Shorter wavelength → more scattering
• Longer wavelength → less scattering

4. Applications

• Blue colour of sky
• Red sun at sunrise and sunset

Exam Focus (MHT-CET)

Very frequent MCQs on Tyndall effect, blue sky and red sun.