Class 8 Science
Friction
Question 1.
What is the force of friction?
Question 2.
What are the factors affecting friction?
Question 3.
Why friction is known as a necessary evil?
Question 4.
Friction depends
(a) on the nature of substances in contact.
(b) not on the nature of substances in contact.
(c) can be both (a) and (b).
(d) none of the above.
Question 5.
Friction can be increased by:
(a) making a surface smooth.
(b) making a surface rough.
(c) both (a) and (b).
(d) none of the above.
Question 6.
What do you understand by rolling friction?
Question 7.
Fluid friction can be ___________ by giving suitable shapes to bodies moving in fluids.
(a) maximised
(b) minimised
(c) both (a) and (b)
(d) none of the above
Question 8.
The sole of the shoes and the tyres of the vehicle are treaded to ___________ friction.
(a) increase
(b) decrease
(c) both (a) and (b)
(d) maintain
Question 9.
In many machines, friction is ___________ by using ball bearings.
(a) reduced
(b) increased
(c) balanced
(d) created
Question 10.
Rolling friction is __________ than sliding friction.
(a) greater
(b) larger
(c) very much higher
(d) smaller
Question 11.
Fluids are:
(a) iron materials.
(b) gold materials.
(c) gases and liquids.
(d) none of the above.
Question 12.
The frictional force exerted by fluids is also known as:
(a) drag force.
(b) gravitational force.
(c) elastic force.
(d) electrostatic force.
Question 13.
Why should we pull luggage fitted with rollers?
Question 14.
What is spring balance?
Question 15.
When one body rolls over another body, _____________ friction comes play.
(a) rolling
(b) sliding
(c) fluid friction
(d) static friction
Question 16.
_____________ friction comes into play when we try to move an object at rest.
(a) Sliding
(b) Static
(c) Rolling
(d) Fluid
Question 17.
___________ friction comes into play when an object is sliding over another.
(a) Sliding
(b) Static
(c) Rolling
(d) Fluid
Question 18.
___________ opposes relative motion between two surfaces in contact.
(a) Force
(b) Work
(c) Friction
(d) None of the above
Question 19.
For a given pair of surfaces, friction depends upon the state of _____________ of those surfaces.
(a) smoothness
(b) roughness
(c) both (a) and (b)
(d) none of the above
Question 20.
Friction can be increased by making a surface ______________.
(a) smooth
(b) rough
(c) both (a) and (b)
(d) bumpy
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All About Daily Practice Problems on Class 8 Science Friction NCERT Chapter 12
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