Everyday Science MCQs | Top Important MCQs



 1. What is the chemical formula of water?

A) H2O2
B) CO2
C) H2O
D) O2
Correct Answer: C) H2O

 

2. Which gas is most abundant in the Earth's atmosphere?

A) Oxygen
B) Carbon Dioxide
C) Nitrogen
D) Hydrogen
Correct Answer: C) Nitrogen

 

3. What is the unit of electric current?

A) Volt
B) Ohm
C) Ampere
D) Watt
Correct Answer: C) Ampere

 

4. Which planet is known as the Red Planet?

A) Venus
B) Mars
C) Jupiter
D) Saturn
Correct Answer: B) Mars

 

5. What is the speed of light in a vacuum?

A) 300,000 km/s
B) 150,000 km/s
C) 500,000 km/s
D) 1,000,000 km/s
Correct Answer: A) 300,000 km/s

 

6. Which vitamin is produced in the human body when exposed to sunlight?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
Correct Answer: D) Vitamin D

 

7. What is the main function of red blood cells?

A) Fight infections
B) Carry oxygen
C) Digest food
D) Produce hormones
Correct Answer: B) Carry oxygen

 

8. What is the pH value of pure water?

A) 5
B) 7
C) 10
D) 14
Correct Answer: B) 7

 

9. Which metal is liquid at room temperature?

A) Iron
B) Mercury
C) Gold
D) Silver
Correct Answer: B) Mercury

 

10. What is the smallest unit of life?

A) Atom
B) Molecule
C) Cell
D) Tissue
Correct Answer: C) Cell

 

11. Which gas is responsible for the greenhouse effect?

A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Hydrogen
Correct Answer: C) Carbon Dioxide

 

12. What is the chemical symbol for gold?

A) Ag
B) Au
C) Fe
D) Pb
Correct Answer: B) Au

 

13. Which organ is responsible for filtering blood in the human body?

A) Heart
B) Lungs
C) Kidneys
D) Liver
Correct Answer: C) Kidneys

 

14. What is the hardest natural substance on Earth?

A) Iron
B) Diamond
C) Gold
D) Quartz
Correct Answer: B) Diamond

 

15. Which force keeps planets in orbit around the Sun?

A) Magnetic Force
B) Gravitational Force
C) Frictional Force
D) Electrostatic Force
Correct Answer: B) Gravitational Force

 

16. What is the main component of natural gas?

A) Methane
B) Ethane
C) Propane
D) Butane
Correct Answer: A) Methane

 

17. Which part of the plant conducts photosynthesis?

A) Roots
B) Stem
C) Leaves
D) Flowers
Correct Answer: C) Leaves

 

18. What is the boiling point of water in Celsius?

A) 50°C
B) 75°C
C) 100°C
D) 120°C
Correct Answer: C) 100°C

 

19. Which gas is used in balloons to make them float?

A) Oxygen
B) Hydrogen
C) Helium
D) Nitrogen
Correct Answer: C) Helium

 

20. What is the largest organ in the human body?

A) Heart
B) Liver
C) Skin
D) Lungs
Correct Answer: C) Skin

 

21. Which element is essential for the formation of bones and teeth?

A) Iron
B) Calcium
C) Sodium
D) Potassium
Correct Answer: B) Calcium

 

22. What is the chemical formula of table salt?

A) NaCl
B) H2O
C) CO2
D) HCl
Correct Answer: A) NaCl

 

23. Which vitamin is essential for blood clotting?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin K
Correct Answer: D) Vitamin K

 

24. What is the unit of frequency?

A) Hertz
B) Joule
C) Watt
D) Pascal
Correct Answer: A) Hertz

 

25. Which planet is closest to the Sun?

A) Venus
B) Earth
C) Mercury
D) Mars
Correct Answer: C) Mercury

 

26. What is the chemical symbol for sodium?

A) So
B) Na
C) S
D) K
Correct Answer: B) Na

 

27. Which gas do plants absorb during photosynthesis?

A) Oxygen
B) Carbon Dioxide
C) Nitrogen
D) Hydrogen
Correct Answer: B) Carbon Dioxide

 

28. What is the freezing point of water in Celsius?

A) 0°C
B) 10°C
C) -10°C
D) 100°C
Correct Answer: A) 0°C

 

29. Which instrument is used to measure atmospheric pressure?

A) Thermometer
B) Barometer
C) Hygrometer
D) Anemometer
Correct Answer: B) Barometer

 

30. What is the chemical formula of glucose?

A) C6H12O6
B) CO2
C) H2O
D) NaCl
Correct Answer: A) C6H12O6

 

31. Which vitamin is found in citrus fruits like oranges?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
Correct Answer: C) Vitamin C

 

32. What is the unit of energy?

A) Joule
B) Watt
C) Volt
D) Ampere
Correct Answer: A) Joule

 

33. Which gas is released during photosynthesis?

A) Oxygen
B) Carbon Dioxide
C) Nitrogen
D) Hydrogen
Correct Answer: A) Oxygen

 

34. What is the chemical symbol for iron?

A) Ir
B) Fe
C) In
D) Au
Correct Answer: B) Fe

 

35. Which part of the human brain controls balance?

A) Cerebrum
B) Cerebellum
C) Medulla
D) Thalamus
Correct Answer: B) Cerebellum

 

36. What is the chemical formula of methane?

A) CH4
B) CO2
C) H2O
D) NH3
Correct Answer: A) CH4

 

37. Which vitamin is essential for good vision?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
Correct Answer: A) Vitamin A

 

38. What is the unit of electric resistance?

A) Volt
B) Ohm
C) Ampere
D) Watt
Correct Answer: B) Ohm

 

39. Which planet is known as the "Morning Star"?

A) Venus
B) Mars
C) Jupiter
D) Saturn
Correct Answer: A) Venus

 

40. What is the chemical symbol for carbon?

A) Ca
B) Co
C) C
D) Cr
Correct Answer: C) C

 

41. Which gas is used in fire extinguishers?

A) Oxygen
B) Carbon Dioxide
C) Nitrogen
D) Hydrogen
Correct Answer: B) Carbon Dioxide

 

42. What is the chemical formula of ammonia?

A) NH3
B) CO2
C) H2O
D) NaCl
Correct Answer: A) NH3

 

43. Which vitamin is essential for healthy skin?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin E
Correct Answer: D) Vitamin E

 

44. What is the unit of power?

A) Joule
B) Watt
C) Volt
D) Ampere
Correct Answer: B) Watt

 

45. Which planet has the most moons?

A) Earth
B) Mars
C) Jupiter
D) Saturn
Correct Answer: D) Saturn

 

46. What is the chemical symbol for silver?

A) Si
B) Ag
C) Au
D) Al
Correct Answer: B) Ag

 

47. Which gas is used in refrigerators?

A) Oxygen
B) Nitrogen
C) Freon
D) Hydrogen
Correct Answer: C) Freon

 

48. What is the chemical formula of sulfuric acid?

A) H2SO4
B) HCl
C) HNO3
D) H2O
Correct Answer: A) H2SO4

 

49. Which vitamin is essential for strong bones?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
Correct Answer: D) Vitamin D

 

50. What is the unit of force?

A) Joule
B) Newton
C) Watt
D) Pascal
Correct Answer: B) Newton

 

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