1.
1. What is the powerhouse of the cell?
2.
2. Which planet is known as the Red Planet?
3.
3. What is the chemical symbol for water?
4.
4. What gas do plants absorb during photosynthesis?
5.
5. What is the hardest natural substance on Earth?
6.
6. Which unit is used to measure electrical resistance?
7.
7. What is the approximate speed of light?
8.
8. Which organ in the human body pumps blood?
9.
9. What is the main gas found in the air we breathe?
10.
10. What type of lens is used in a magnifying glass?
1 out of 5
11.
11. Which state of matter has a definite volume but no definite shape?
12.
12. What is the chemical symbol for Gold?
13.
13. Who proposed the theory of evolution by natural selection?
14.
14. What is the boiling point of water at standard atmospheric pressure?
15.
15. Which component of blood is responsible for fighting infections?
16.
16. What is the primary source of energy for Earth's climate system?
17.
17. Which acid is found in lemons?
18.
18. What is the name of the galaxy that contains our Solar System?
19.
19. Which instrument is used to measure atmospheric pressure?
20.
20. What is the most abundant metal in the Earth's crust?
2 out of 5
21.
21. What is the basic unit of life?
22.
22. Which subatomic particle has a negative charge?
23.
23. What force keeps us grounded on Earth?
24.
24. Which planet is closest to the Sun?
25.
25. What is the process by which liquid turns into gas?
26.
26. Which vitamin is produced when human skin is exposed to sunlight?
27.
27. What is the pH value of pure water?
28.
28. Which sound frequency range is audible to humans?
29.
29. What is the chemical formula for table salt?
30.
30. Which organelle is responsible for photosynthesis in plant cells?
3 out of 5