💡 Light – MCQs for Class 8 Science

Part 1: Q1–Q25

Q1. Light travels in:

A) Straight line
B) Curved path
C) Zig-zag path
D) Spiral path

✅ Correct Answer: A) Straight line

Explanation:

• A) ✔ Light always travels in a straight line in a medium (rectilinear propagation).
• B, C, D – Incorrect, unless refraction/deflection occurs.

Q2. The bouncing back of light after striking a surface is called:

A) Refraction
B) Reflection
C) Dispersion
D) Scattering

✅ Correct Answer: B) Reflection

Explanation:

• B) ✔ Reflection is bouncing back of light from a surface.

Q3. Which law states that the angle of incidence equals the angle of reflection?

A) Newton’s Law
B) Law of Refraction
C) Law of Reflection
D) Snell’s Law

✅ Correct Answer: C) Law of Reflection

Explanation:

• C) ✔ One of the fundamental laws of reflection.

Q4. A smooth polished surface is called:

A) Rough surface
B) Reflector
C) Plane mirror
D) Diffuser

✅ Correct Answer: C) Plane mirror

Explanation:

• C) ✔ Plane mirrors reflect regular images.

Q5. The image formed in a plane mirror is always:

A) Real and inverted
B) Virtual and erect
C) Diminished
D) Enlarged

✅ Correct Answer: B) Virtual and erect

Explanation:

• B) ✔ Plane mirror image is virtual, erect, and of the same size.

Q6. The angle between incident ray and normal is called:

A) Angle of refraction
B) Angle of incidence
C) Angle of reflection
D) Critical angle

✅ Correct Answer: B) Angle of incidence

Explanation:

• B) ✔ By definition, it is measured with respect to the normal.

Q7. The periscope works on the principle of:

A) Refraction
B) Diffraction
C) Reflection
D) Dispersion

✅ Correct Answer: C) Reflection

Explanation:

• C) ✔ Uses two plane mirrors at 45° for reflection.

Q8. Kaleidoscope works on the principle of:

A) Refraction
B) Multiple reflections
C) Dispersion
D) Scattering

✅ Correct Answer: B) Multiple reflections

Explanation:

• B) ✔ Mirrors arranged at angles create patterns using multiple reflections.

Q9. The splitting of light into its constituent colours is called:

A) Reflection
B) Refraction
C) Dispersion
D) Scattering

✅ Correct Answer: C) Dispersion

Explanation:

• C) ✔ Dispersion produces a spectrum of seven colours.

Q10. The band of colours obtained by dispersion of light is called:

A) Prism band
B) Spectrum
C) Rainbow
D) Mirage

✅ Correct Answer: B) Spectrum

Explanation:

• B) ✔ Spectrum = VIBGYOR sequence.

Q11. The colour of light least deviated in a prism is:

A) Red
B) Violet
C) Green
D) Blue

✅ Correct Answer: A) Red

Explanation:

• A) ✔ Red light bends least; violet bends most.

Q12. Which type of mirror is used in car headlights?

A) Plane mirror
B) Convex mirror
C) Concave mirror
D) Cylindrical mirror

✅ Correct Answer: C) Concave mirror

Explanation:

• C) ✔ Concave mirrors converge light → strong beam.

Q13. Which mirror is used in rear-view mirrors of vehicles?

A) Plane mirror
B) Concave mirror
C) Convex mirror
D) None

✅ Correct Answer: C) Convex mirror

Explanation:

• C) ✔ Convex mirrors provide a wider field of view.

Q14. A convex lens is also known as:

A) Converging lens
B) Diverging lens
C) Cylindrical lens
D) Plano lens

✅ Correct Answer: A) Converging lens

Explanation:

• A) ✔ Convex lens converges parallel rays at focus.

Q15. A concave lens is also called:

A) Converging lens
B) Diverging lens
C) Cylindrical lens
D) Plano lens

✅ Correct Answer: B) Diverging lens

Explanation:

• B) ✔ Concave lens spreads out light rays.

Q16. The human eye lens is a:

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

✅ Correct Answer: A) Convex lens

Explanation:

• A) ✔ Eye lens is convex, forms real inverted image on retina.

Q17. The defect of eye in which a person cannot see distant objects clearly is:

A) Hypermetropia
B) Myopia
C) Cataract
D) Astigmatism

✅ Correct Answer: B) Myopia

Explanation:

• B) ✔ Myopia = short-sightedness.

Q18. Myopia is corrected using:

A) Convex lens
B) Concave lens
C) Plane mirror
D) Cylindrical lens

✅ Correct Answer: B) Concave lens

Explanation:

• B) ✔ Concave lens diverges rays to correct myopia.

Q19. The defect of eye in which near objects cannot be seen clearly is:

A) Myopia
B) Hypermetropia
C) Cataract
D) Astigmatism

✅ Correct Answer: B) Hypermetropia

Explanation:

• B) ✔ Hypermetropia = long-sightedness.

Q20. Hypermetropia is corrected using:

A) Concave lens
B) Convex lens
C) Plane mirror
D) Prism

✅ Correct Answer: B) Convex lens

Explanation:

• B) ✔ Convex lens converges rays to correct hypermetropia.

Q21. The condition in which the eye lens becomes cloudy is called:

A) Myopia
B) Hypermetropia
C) Cataract
D) Presbyopia

✅ Correct Answer: C) Cataract

Explanation:

• C) ✔ Cataract = lens opacity → blurred vision.

Q22. The small opening in the eye that controls light entry is called:

A) Retina
B) Cornea
C) Pupil
D) Lens

✅ Correct Answer: C) Pupil

Explanation:

• C) ✔ Pupil size regulates light entering the eye.

Q23. The colourful circular part of the eye controlling pupil size is called:

A) Retina
B) Iris
C) Cornea
D) Lens

✅ Correct Answer: B) Iris

Explanation:

• B) ✔ Iris adjusts pupil size.

Q24. The screen in the eye on which image is formed is:

A) Cornea
B) Lens
C) Retina
D) Iris

✅ Correct Answer: C) Retina

Explanation:

• C) ✔ Retina acts like a natural screen with light-sensitive cells.

Q25. The splitting of white light in a prism is due to:

A) Same refractive index for all colours
B) Different refractive index for different colours
C) Equal bending of all colours
D) Reflection

✅ Correct Answer: B) Different refractive index for different colours

Explanation:

• B) ✔ Each colour bends differently (dispersion).

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