1. Which of the following is the smallest unit of matter?
a) Atom
b) Molecule
c) Proton
d) Neutron
Answer: a) Atom
2. What is the chemical symbol for water?
a) Wa
b) Wo
c) Wt
d) H2O
Answer: d) H2O
3. What is the primary function of red blood cells in the human body?
a) Transporting oxygen
b) Fighting infections
c) Digesting food
d) Producing energy
Answer: a) Transporting oxygen
4. Who is credited with the discovery of penicillin?
a) Alexander Fleming
b) Louis Pasteur
c) Marie Curie
d) Albert Einstein
Answer: a) Alexander Fleming
5. Which planet is known as the “Red Planet”?
a) Venus
b) Mars
c) Jupiter
d) Saturn
Answer: b) Mars
6. What is the process by which plants make their food called?
a) Photosynthesis
b) Respiration
c) Digestion
d) Fermentation
Answer: a) Photosynthesis
7. Which of the following is a renewable source of energy?
a) Coal
b) Natural gas
c) Solar power
d) Petroleum
Answer: c) Solar power
8. What is the chemical symbol for iron?
a) Ir
b) Fe
c) Io
d) In
Answer: b) Fe
9. What is the hardest natural substance on Earth?
a) Diamond
b) Gold
c) Quartz
d) Tungsten
Answer: a) Diamond
10. What is the SI unit of force?
a) Newton
b) Joule
c) Watt
d) Volt
Answer: a) Newton
11. Which of the following is not a type of electromagnetic radiation?
a) X-rays
b) Sound waves
c) Microwaves
d) Gamma rays
Answer: b) Sound waves
12. What is the chemical formula for table salt?
a) NaCl
b) H2O
c) CO2
d) NH3
Answer: a) NaCl
13. What is the name of the process by which plants release water vapor into the atmosphere?
a) Transpiration
b) Condensation
c) Precipitation
d) Evaporation
Answer: a) Transpiration
14. Which of the following is not a type of simple machine?
a) Lever
b) Pulley
c) Battery
d) Inclined plane
Answer: c) Battery
15. What is the chemical symbol for hydrogen?
a) Hg
b) He
c) H
d) Ho
Answer: c) H
16. What is the process by which water vapor turns into liquid water?
a) Evaporation
b) Condensation
c) Sublimation
d) Precipitation
Answer: b) Condensation
17. Which of the following is not a primary color of light?
a) Red
b) Green
c) Yellow
d) Blue
Answer: c) Yellow
18. What is the name of the scientist who proposed the theory of relativity?
a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Nikola Tesla
Answer: b) Albert Einstein
19. Which of the following is a greenhouse gas?
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Argon
Answer: c) Carbon dioxide
20. What is the main component of the Earth’s atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: c) Nitrogen