Question

3) Which of the following does not happen due to friction?
(A) A nail is fixed in the wall
(B) fire can be produced with a matchstick.
(C) heat is produced
(D) durability of chappals increases.
4)Which of the following are the benefits of special shape of an aeroplane?
(i) Fluid friction is reduced
(ii) Fluid friction is increased
(iii) Energy loss is as low as possible,
(iv) An aeroplane can fly like a bird
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Answer 1

Answer:

3) Which of the following does not happen due to friction?

=(D) durability of chappals

4)Which of the following are the benefits of special shape of an aeroplane?

= ( iii) Energy loss is as low as possible,