Everyday Science MCQs with Answers 2026

1. The speed of light is:

a) 150,000 km/s    b) 300,000 km/s ✅    c) 500,000 km/s    d) 100,000 km/s

2. Sound cannot travel through:

a) Air    b) Water    c) Vacuum ✅    d) Steel

3. The SI unit of force is:

a) Joule    b) Watt    c) Newton ✅    d) Pascal

4. Diamond is a form of:

a) Gold    b) Carbon ✅    c) Silver    d) Iron

5. The chemical formula of water is:

a) HO    b) H₂O ✅    c) H₃O    d) OH₂

6. The chemical formula of salt (table salt) is:

a) KCl    b) NaCl ✅    c) CaCl₂    d) MgCl₂

7. Brass is an alloy of:

a) Iron and Carbon    b) Copper and Zinc ✅    c) Gold and Silver    d) Tin and Lead

8. The boiling point of water is:

a) 50°C    b) 100°C ✅    c) 150°C    d) 200°C

9. The freezing point of water is:

a) 0°C ✅    b) 10°C    c) -10°C    d) 5°C

10. Which gas is most abundant in atmosphere?

a) Oxygen    b) Nitrogen (78%) ✅    c) Carbon dioxide    d) Hydrogen

11. The pH of pure water is:

a) 1    b) 5    c) 7 ✅    d) 14

12. Ozone layer protects us from:

a) Rain    b) Ultraviolet (UV) rays ✅    c) Sound    d) Heat

13. The unit of electric current is:

a) Volt    b) Watt    c) Ampere ✅    d) Ohm

14. The largest organ of human body is:

a) Heart    b) Liver    c) Skin ✅    d) Brain

15. Blood is purified by:

a) Heart    b) Liver    c) Kidneys ✅    d) Lungs

16. The powerhouse of the cell is:

a) Nucleus    b) Mitochondria ✅    c) Ribosome    d) Cell wall

17. Photosynthesis takes place in:

a) Roots    b) Stem    c) Leaves (Chloroplast) ✅    d) Flowers

18. The normal body temperature is:

a) 96°F    b) 98.6°F (37°C) ✅    c) 100°F    d) 95°F

19. Red blood cells are made in:

a) Heart    b) Liver    c) Bone Marrow ✅    d) Kidneys

20. The largest bone in human body is:

a) Humerus    b) Spine    c) Femur (thigh bone) ✅    d) Tibia

21. The smallest bone is in:

a) Hand    b) Ear (Stapes) ✅    c) Nose    d) Foot

22. Hemoglobin contains which metal?

a) Calcium    b) Iron ✅    c) Zinc    d) Copper

23. DNA stands for:

a) Deoxyribonucleic Acid ✅    b) Dinitrogen Acid    c) Deoxynitrogen Acid    d) Digital Nucleic Acid

24. The human heart has _____ chambers:

a) 2    b) 3    c) 4 ✅    d) 5

25. Insulin is produced by:

a) Liver    b) Pancreas ✅    c) Kidneys    d) Heart

26. Vitamin D is obtained from:

a) Fruits    b) Sunlight ✅    c) Meat    d) Rice

27. Vitamin C is found in:

a) Meat    b) Citrus fruits (oranges, lemons) ✅    c) Rice    d) Bread

28. Vitamin A deficiency causes:

a) Scurvy    b) Rickets    c) Night blindness ✅    d) Anemia

29. Vitamin D deficiency causes:

a) Night blindness    b) Rickets ✅    c) Scurvy    d) Beriberi

30. Scurvy is caused by deficiency of:

a) Vitamin A    b) Vitamin B    c) Vitamin C ✅    d) Vitamin D

31. Iron deficiency causes:

a) Night blindness    b) Rickets    c) Anemia ✅    d) Goiter

32. Iodine deficiency causes:

a) Anemia    b) Goiter ✅    c) Rickets    d) Scurvy

33. The main source of energy for body is:

a) Protein    b) Fat    c) Carbohydrates ✅    d) Vitamins

34. Which blood group is universal donor?

a) A    b) B    c) AB    d) O ✅

35. Which blood group is universal receiver?

a) A    b) B    c) AB ✅    d) O

36. Malaria is caused by:

a) Bacteria    b) Virus    c) Plasmodium (Protozoa) ✅    d) Fungus

37. COVID-19 is caused by:

a) Bacteria    b) Virus (SARS-CoV-2) ✅    c) Fungus    d) Protozoa

38. Antibiotics are effective against:

a) Bacteria ✅    b) Viruses    c) Both    d) Neither

39. Dengue fever is spread by:

a) Housefly    b) Aedes mosquito ✅    c) Rat    d) Dog

40. The nearest planet to Sun is:

a) Venus    b) Mercury ✅    c) Earth    d) Mars

41. The largest planet is:

a) Saturn    b) Jupiter ✅    c) Neptune    d) Uranus

42. The hottest planet is:

a) Mercury    b) Venus ✅    c) Mars    d) Jupiter

43. How many planets in our solar system?

a) 7    b) 8 ✅    c) 9    d) 10

44. The Milky Way is a:

a) Star    b) Planet    c) Galaxy ✅    d) Comet

45. Echo is caused by:

a) Refraction    b) Diffraction    c) Reflection of sound ✅    d) Absorption

46. A rainbow has _____ colors:

a) 5    b) 6    c) 7 ✅    d) 8

47. The hardest natural substance is:

a) Gold    b) Diamond ✅    c) Iron    d) Platinum

48. Global warming is caused by:

a) Oxygen    b) Greenhouse gases (CO₂) ✅    c) Nitrogen    d) Hydrogen

49. The ozone layer is in:

a) Troposphere    b) Stratosphere ✅    c) Mesosphere    d) Thermosphere

50. Telescope was invented by:

a) Newton    b) Galileo Galilei ✅    c) Edison    d) Bell

51. The first satellite in space was:

a) Apollo    b) Sputnik ✅    c) Hubble    d) Discovery