(a) Both A and R are true, and R is correct explanation of the assertion. (b) Both A and R are true, but R is not the correct explanation of the assertion. (c) A is true, but R is false. (d) A is false, but R is true. 16. Assertion: Use of fertilizers greatly enhances crop productivity. Reason: Irrigation is very important in increasing crop productivity. 17. Assertion: The crops that are sown in the rainy season are called Kharif Crops. Reason: Rabi crops require more water. 18. Assertion: Nylon Fibres cannot be used for making ropes for climbers, Reason: Nylon fibres are very strong 19. Assertion: Bakelite is used for making electrical switches. Reason: Bakelite is a poor conductors of electricity. 20. Assertion: Forces are due to interaction Reason: Without an interaction, the force cannot be applied to body to change the state of an object.
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Answer:
16-b
17-d
18-d
19-a
20-c
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