7. Assertion (A): The reaction of calcium with water is less violent in comparison to that of sodium. Reason (R): The heat evolved is not sufficient for the hydrogen to catch fire. a) Both A and Rare true and R is the correct explanation of A. b) Both A and Rare true and R is not the correct explanation of A. c) A is true but R is false d) If both A and Rare false. 8. Assertion(A):Zinc can easily displace copper on reacting with a solution of copper sulphate. Reason(R):Copper is more reactive metal as compared to Zinc. a) Both A and Rare true and R is the correct explanation of A. b) Both A and Rare true and R is not the correct explanation of A. c) A is true but R is false d) If both A and Rare false. 9. ASSERTION (A):Arteries are thick walled and elastic in nature. REASON (R) :Arteries have to transport blood away from the heart. a) Both A and Rare true and R is the correct explanation of A. b) Both A and Rare true and R is not the correct explanation of A. c) A is true but R is false d) If both A and Rare false. 10.ASSERTION (A) :The purpose of making urine is to filter out undigested food from intestine. REASON (R) :Kidneys filter the waste and produce urine. a) Both A and Rare true and R is the correct explanation of A. b) Both A and Rare true and R is not the correct explanation of A. c) A is true but R is false d) A is False but R is True.