Question

23.A matchstick struck on a matchbox catches fire easily because

(a) Friction may cause fire

(b) Of chemical reaction

(c) Force heated the match stick

(d) None of the above

24.Tyres are treaded to

(a) look good

(b) Increase friction

(c) increase its longevity

(d) increase weight of the tyre

25.Lubricants are substances which

(a) Increase friction

(b) Are used to light fire

(c) Reduce friction

(d) Are used to put out a fire

26.Sliding friction is _________ than / to rolling friction

(a) smaller

(b) greater

(c) equal

(d) None of the above

27.The frictional force exerted by fluids is also called ______

(a) drug

(b) drag

(c) drop

(d) drown

28.Four children were asked to arrange forces due to rolling, static and sliding frictions in an

increasing order. Their arrangements are given below. Choose the correct arrangement.

(a) Rolling, Static, Sliding

(b) Static, Rolling, Sliding

(c) Rolling, sliding, static

(d) Sliding, Static, Rolling

29.A boat or an aeroplane has a pointed or tapering front / head. Why?

(a) To increase the friction of fluid

(b) To reduce the friction of fluid

(c) To look good

(d) For no reason​

Answer 1

Answer:

23)a

24)b

25)c

26)b

27)b

28)a

29)b

Answer 2

Answer:

first answer-. (a) Friction may cause fire

second answer- c) increase its longevity

third answer-. (a) Increase friction

forth answer-. (a) smaller

fifth answer-. no idea sorry

sixth answer-. (c) Rolling, sliding, static

seventh answer-. (a) To increase the friction of fluid

Explanation:

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