### Multiple-Choice Questions

1. Consider the following statements about weeding and identify the incorrect one.
- A. Weeding is best done during tilling itself.
- B. Weeding is the process of growing weed.
- C. Weeding is the process of removal of weeds.
- D. Weeding is usually done manually or by using weedicides.

2. Which of the following is not a traditional irrigation method?
- A. Moat
- B. Chain pump
- C. Lever system
- D. Drip system

3. If you were a farmer, which of the following methods would you use to separate good quality and viable grains from a heap of grains after harvest?
- A. Checking the weight of grains.
- B. Immersing the grains in water.
- C. Checking grains under sunlight for pores.
- D. Sowing seeds and waiting for germination.

4. Which of the following is not a petroleum product?
- A. Kerosene
- B. Beeswax
- C. Pitch black

5. Which of the following is the purest form of carbon?
- A. Coal gas
- B. Coal tar
- C. Coke

6. Which of the following is used to manufacture steel?
- A. Coke
- B. Coal tar
- C. Lubricating oil
- D. None of the above

7. Which of the following petroleum contents boil at temperatures greater than 3500 °C?
- A. Diesel oil
- B. Coal gas
- C. Petroleum gas

8. Two objects repel each other. This repulsion could be due to:
- A. Frictional force only
- B. Electrostatic force only
- C. Magnetic force only
- D. Either a magnetic or an electrostatic force

9. What is the state of motion?
- A. Position of rest
- B. Position of motion
- C. Both the state of rest and motion
- D. None of these

10. Leaves or fruits fall on the ground due to:
- A. Magnetic force
- B. Gravitational force
- C. Electrostatic force
- D. Muscular force

### Very Short Questions (5x1=5)

11. Name the methods applied for weeding.

12. Name any two fertilizers.

13. Name three constituents of petroleum and write their uses also.

14. Give one example of gravitational force.

15. Does the force of gravity act on dust particles?

### Short Questions (5x2=10)

16. What is ploughing or tilling? State its advantages.

17. How many varieties of coal are there? Explain any one.

18. Explain how the burning of fossil fuels causes air pollution.

19. How many types of contact force are there? Explain any one.

20. What is the relationship between pressure and the area on which it is applied?