💡 Important General Science MCQs on Light for RRB Group D 2025

Are you preparing for the RRB Group D 2025 exam? Give your General Science preparation a solid boost with this specially curated set of 25 important multiple-choice questions (MCQs) on the topic of Light and its related concepts. These questions are based on previous year papers and aligned with the latest exam pattern, making them highly relevant for scoring well in the General Awareness section.

Go through them with answers and revise the key concepts efficiently for your upcoming exam!

Important General Science MCQs on Light for RRB Group D 2025

1. Which lens is used to correct short sight (myopia)?
a) Convex lens
b) Concave lens
c) Bifocal lens
d) Cylindrical lens

2. Who is regarded as the father of the green revolution in India?
a) Norman Borlaug
b) M.S. Swaminathan
c) Verghese Kurien
d) C. Subramaniam

3. The audible frequency range for humans is:
a) 400–800 Hz
b) 500–1000 Hz
c) 200–400 Hz
d) 20–20,000 Hz

4. Which vitamin is mainly obtained from sunlight?
a) Vitamin A
b) Vitamin B
c) Vitamin D
d) Vitamin K

5. Which gas is used to fill balloons so that they float?
a) Oxygen
b) Helium
c) Nitrogen
d) Hydrogen

6. Which medicine is commonly used to treat malaria?
a) Quinine
b) Insulin
c) Penicillin
d) Morphine

7. What is the SI unit of force?
a) Kilogram-meter
b) Joule
c) Newton
d) Pascal

8. What is Newton’s third law of motion?
a) Action and reaction are equal and opposite
b) An object in motion stays in motion
c) F = ma
d) Energy is conserved

9. Who was the first Indian woman to go to space?
a) Kalpana Chawla
b) Sunita Williams
c) Rakesh Sharma
d) Tessy Thomas

10. Which scientist first proposed the heliocentric theory?
a) Galileo
b) Newton
c) Copernicus
d) Kepler

11. Which of the following diseases is caused by bacteria?
a) AIDS
b) Cholera
c) Malaria
d) Influenza

12. The word “ecology” was first coined by:
a) Darwin
b) Aristotle
c) Ernst Haeckel
d) Linnaeus

13. Which vitamin deficiency causes rickets?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin D

14. What causes the twinkling of stars?
a) Diffraction
b) Refraction
c) Dispersion
d) Reflection

15. Which part of the eye is affected in cataract?
a) Retina
b) Cornea
c) Lens
d) Iris

16. What is the SI unit of pressure?
a) Pascal
b) Bar
c) Atmosphere
d) Newton

17. Which gas is known as laughing gas?
a) Carbon dioxide
b) Nitrous oxide
c) Oxygen
d) Ammonia

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18. Who is known as the father of modern chemistry?
a) Lavoisier
b) Dalton
c) Mendeleev
d) Boyle

19. Who invented the television?
a) J.L. Baird
b) Alexander Graham Bell
c) Thomas Edison
d) Marconi

20. What is the phenomenon where light bends around corners?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

21. Which of the following is not a renewable energy source?
a) Solar energy
b) Wind energy
c) Coal
d) Biomass

22. Which of the following helps transmit signals to the brain?
a) Neuron
b) Artery
c) Vein
d) Ligament

23. Which organ purifies blood in the human body?
a) Liver
b) Lungs
c) Kidney
d) Heart

24. Which of the following is not a greenhouse gas?
a) Carbon dioxide
b) Methane
c) Nitrogen
d) Water vapor

25. The phenomenon of light bending due to change in medium is:
a) Interference
b) Diffraction
c) Polarization
d) Refraction

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Answers to the RRB GROUP D 2025: Most Important Questions on Light

Here are the answers to the MCQs:

1. b
2. b
3. d
4. c
5. b
6. a
7. c
8. a
9. a
10. c
11. b
12. c
13. d
14. b
15. c
16. a
17. b
18. a
19. a
20. c
21. c
22. a
23. c
24. c
25. d