20 Generla common science questions

1. What is the chemical symbol for water?
a) H2O
b) CO2
c) O2
d) NaCl

2. Which planet is known as the Red Planet?
a) Venus
b) Mars
c) Jupiter
d) Saturn

3. What is the smallest unit of life?
a) Atom
b) Molecule
c) Cell
d) Tissue

4. Which gas do plants absorb from the atmosphere during photosynthesis?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen

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

6. Which element has the atomic number 1?
a) Helium
b) Hydrogen
c) Oxygen
d) Carbon

7. What is the main function of red blood cells?
a) Fight infection
b) Transport oxygen
c) Digest food
d) Produce hormones

8. Which layer of the Earth is the thinnest?
a) Crust
b) Mantle
c) Outer core
d) Inner core

9. What is the process by which plants make their own food called?
a) Respiration
b) Photosynthesis
c) Digestion
d) Fermentation

10. Which force keeps the planets in orbit around the Sun?
a) Electromagnetic force
b) Gravitational force
c) Nuclear force
d) Frictional force

11. What is the pH value of pure water?
a) 5
b) 7
c) 10
d) 14

12. Which gas is most abundant in Earth's atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon

13. What is the unit of electrical resistance?
a) Volt
b) Ampere
c) Ohm
d) Watt

14. Which organ is responsible for filtering blood in the human body?
a) Heart
b) Liver
c) Kidneys
d) Lungs

15. What is the hardest natural substance on Earth?
a) Gold
b) Diamond
c) Quartz
d) Iron

16. Which scientist proposed the theory of relativity?
a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Nikola Tesla

17. What is the chemical formula for table salt?
a) NaCl
b) H2O
c) CO2
d) C6H12O6

18. Which part of the plant absorbs water and nutrients from the soil?
a) Leaves
b) Stem
c) Roots
d) Flowers

19. What is the primary source of energy for the Earth?
a) Wind
b) Sun
c) Geothermal heat
d) Fossil fuels

20. Which gas is responsible for the greenhouse effect?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen

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