Practice Questions

Test yourself, then check the answers below.

1. What is the SI unit of force?
2. A car moving at 72 km/h: what is its speed in m/s?
3. Which mirror is used as a rear-view mirror?
4. Name the lens used to correct myopia.
5. Two resistors of 3 ohm and 6 ohm are in parallel. Find the total resistance.
6. Which hormone lowers blood sugar?
7. Which gas is released when a metal reacts with dilute acid?
8. What is the pH of pure water?
9. Which organelle is called the powerhouse of the cell?
10. Which vitamin deficiency causes scurvy?
11. Name the scientist who discovered the neutron.
12. Which planet is called the Red Planet?
13. What is the full form of SONAR?
14. Which blood group is the universal donor?
15. What is the chemical formula of baking soda?
16. Which law explains why passengers jerk forward when a bus brakes?
17. What is the function of xylem?
18. Name the raw materials of photosynthesis.
19. Name the compound used to set fractured bones.
20. Who proposed the five-kingdom classification?
21. What is the unit of power of a lens?
22. Which gas turns lime water milky?
23. Which organ produces bile?
24. In which trophic level is a grasshopper?
25. Which scientist gave the law of natural selection?
26. Which vector spreads malaria?
27. Name the most reactive metal among sodium, zinc, copper and gold.
28. What is the maximum number of electrons in the M shell?
29. State the chemical name of vitamin C.
30. Which Indian physicist won the Nobel Prize in 1930?

Answers

1. Newton (N).
2. 72 x 5/18 = 20 m/s.
3. Convex mirror.
4. Concave lens.
5. (3 x 6)/(3 + 6) = 2 ohm.
6. Insulin.
7. Hydrogen.
8. 7.
9. Mitochondria.
10. Vitamin C (ascorbic acid).
11. James Chadwick.
12. Mars.
13. Sound Navigation and Ranging.
14. O.
15. NaHCO3 (sodium hydrogencarbonate).
16. Newton's first law (inertia).
17. It carries water and minerals upward from the roots.
18. Carbon dioxide, water and sunlight (with chlorophyll).
19. Plaster of Paris.
20. R. H. Whittaker.
21. Dioptre.
22. Carbon dioxide.
23. Liver.
24. Primary consumer (herbivore).
25. Charles Darwin.
26. Female Anopheles mosquito.
27. Sodium.
28. 18.
29. Ascorbic acid.
30. C. V. Raman.

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