Monday 9 April 2018

CBSE Class 8 - Science - Friction (Worksheet) (#cbsenotes)(#eduvictors)

Science - Friction (Worksheet)

CBSE Class 8 - Science - Friction (Worksheet) (#cbsenotes)(#eduvictors)

MCQs (1-10)

Q1. It is difficult to walk on any oily floor because

a) Floor gets spoiled
b) There is more resistance
c) Force of friction is high
d) Force of friction is very less

Q2: Spring balance is a device used for measuring the _____________ acting on an object.

a) mass
b) pressure
c) force
d) None of the above

Q3: A matchstick struck on a matchbox catches fire easily because

a) Friction may cause a fire
b) Of chemical reaction
c) Force heated the matchstick
d) None of the above

Q4: Tyres are treaded to

a) To look good
b) Increase friction
c) To increase its longevity
d) To increase the weight of the tyre

Q5: Lubricants are substances which

a) Increases friction
b) Are used to light fire
c) Reduces friction
d) Are used to put off a fire

Q6: Sliding friction is _________ than / to rolling friction

a) smaller
b) greater
c) equal
d) None of the above

Q7: The frictional force exerted by fluids is also called ______

a) drug
b) drag
c) drop
d) drown

Q8: Four children were asked to arrange forces due to rolling, static and sliding frictions in 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

Q9: A boat or an aeroplane has a pointed or tapering front/head. Why?

a) To increase the friction of a fluid
b) To reduce the friction of a fluid
c) To look good
d) For no reason

Q10: The sole of the shoes becomes plain after wearing them for several months. The reason is

a) Wearing out due to friction
b) Wearing out due to no friction
c) Sole is of bad quality
d) None of the above

Q11: What form of energy does friction always produce?

Q12: Will you be able to walk if there is no friction?

Q13: Why is talcum powder sprinkled on carrom board?

Q14: Why are boats and aeroplanes given a special shape? Name the kind of shape and also give reasons for the same?

Q15: State two problems caused by friction.

Q16: Why do sportsmen use shoes with spikes?

Q17: Why is oil or grease applied to the moving parts of the machine.

Q18: Explain the terms:
a) Drag
b) Fluids
c) Rolling friction

☛See also:
          Ch 12 - Friction
          Ch 12 - Friction (MCQs-1)
          Ch 12 - Friction (MCQs-2)
          Ch12 - Friction (Assignment)

          Ch 12 - Friction (Worksheet)

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