General Science Questions and Answers for TNPSC Exam Part 1
1. What is the chemical symbol for oxygen?
O
2. What is the chemical formula for water?
H2O
3. Which gas do plants absorb from the atmosphere
during photosynthesis?
Carbon dioxide (CO2)
4. What is the smallest unit of an element
that retains its chemical properties?
Atom
5. Which gas is responsible for the blue color
of the Earth's sky?
Nitrogen
6. What is the process by which plants make
their own food using sunlight?
Photosynthesis
7. What is the chemical symbol for gold?
Au
8. What is the chemical symbol for silver?
Ag
9. What is the chemical symbol for iron?
Fe
10. What is the chemical symbol for sodium?
Na
11. What is the chemical symbol for potassium?
K
12. What is the chemical symbol for calcium?
Ca
13. What is the chemical symbol for hydrogen?
H
14. What is the chemical symbol for carbon?
C
15. What is the chemical symbol for nitrogen?
N
16. What is the chemical symbol for helium?
He
17. Which gas is responsible for the
greenhouse effect on Earth?
Carbon dioxide (CO2)
18. What is the chemical symbol for chlorine?
Cl
19. Which gas do humans exhale when they
breathe?
Carbon dioxide (CO2)
20. What is the chemical formula for methane,
a common natural gas?
CH4
