Question No. 4 to 6 consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (1 × 3 = 3) (a) Both A and R are true, and R is the correct explanation of the assertion. (b) Both A and R are true, and 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. Q4. Assertion (A): Friction is reduced by using ball bearings in many machines. Reason (R): Fluid friction can be minimised by giving suitable shapes to bodies moving influids. Q5. Assertion (A): Zinc displaces copper from copper sulphate solution. Reason (R): Copper is more reactive metal than zinc. Q6. Assertion (A): Antibiotics are the medicines that kill or stop the growth of disease- causing microorganisms. Reason (R): Streptomycin, tetracycline and erythromycin are few antibiotics.
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Answer:
A is true but R is false
Explanation:
Because frition is reduced by using ball bearings in mny machines
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