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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