# Class 8

Explore popular questions from Friction for Class 8. This collection covers Friction previous year Class 8 questions hand picked by experienced teachers.

# Mathematics

Friction

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Q 1. A force that opposes the motion of one surface sliding over another is called

A

lubrication

B

ball bearing

friction

D

polishing

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Q 2. Ball bearings are used to

decrease friction

B

decrease surface area

C

increase friction

D

increase surface area

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Q 3. Lubricants are used to

reduce friction

B

increases friction

C

make a surface oily

D

make a surface shiny

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Q 4. Friction can be increased by

A

making the surface rough

B

increasing the mass of object

both (A) and (B)

D

None of these

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Q 5. When a bicycle travels on a rough surface, its speed

A

increases

decreases

C

remains the same

D

None of these

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Q 6. The use of lubricants makes the surface

smooth

B

rough

C

very rough

D

hard

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Q 7. The frictional force __________ with the __________ in roughness of the surfaces.

A

increases, decrease

B

decreases, decrease

C

increases, increase

Both

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Q 8. The maximum force of friction, when the body just begins to move is known as the

limiting friction

B

rolling friction

C

static fiction

D

dynamic friction

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Q 9. The friction that exists between a surface sliding on another surface is called the

dynamic friction

B

rolling friction

C

static friction

D

limiting friction

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Q 10. The special shape of the body due to which it experiences least fluid friction is called

streamlining

B

friction

C

buoyancy

D

upthrust

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Q 11. Suppose you writing desk is tilted a little.A book kept on it, starts sliding down.The figure,showing the correct direction of frictional force acting on it, is

A B C  Correct Marks 1

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Q 12. Friction, that exists between two surfaces in contact, when there is no relative motion between them, is called

A

sliding friction

static friction

C

viscous drag

D

rolling friction

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Q 13. The energy required to overcome friction is mainly converted into

A

sound energy

heat energy

C

light energy

D

chemical energy

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Q 14. Out of the following, the better lubricant to be used in the moving parts of machine, is

A

water

B

air

C

chalk powder

turpentine oil

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Q 15. Force of friction is more in

A

marble tiles

B

wooden floor

playground

D

glass table

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Q 16. Once a body starts moving on table, the friction which comes into play is

A

static friction

sliding friction

C

limiting friction

D

None of these

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Q 17. The force of friction that comes into play when one body rolls over another surface, is

A

sliding friction

B

limiting friction

rolling friction

D

static friction

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Q 18. These days we use suitcases with wheels because

A

they look smart

they are easy to carry

C

they make less noise

D

none of these

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Q 19. Tyres have cut grooves in them

to increase friction

B

to decreases friction

C

to make them look attractive

D

to save rubber

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Q 20. Why we use circular tyres

A

They require less material

Rolling friction is smaller than sliding friction

C

It is easy to inflate the circular tyres

D

Due to some season other than these listed above

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Q 21. 1 m{tex}^2{/tex} area is equal to:

A

100 cm{tex}^2{/tex}

B

1000 cm{tex}^3{/tex}

10000 cm{tex}^2{/tex}

D

10{tex}^{-4}{/tex}cm{tex}^2{/tex}

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Q 22. Type of contact forces can be

A

Tension force

B

Normal force

C

Muscular force

All of these

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Q 23. When we apply a small force on an object placed on a rough table such that object does not moves at all than the kind of friction force between object and table is

A

kinetic friction

B

rolling friction

C

both rolling and kinetic friction

neither rolling nor kinetic friction

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Q 24. A friction cannot act through

empty space

B

touching

C

touching with metal rod

D

touching with a wooden rod

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Q 25. A force that opposes the motion of one surface sliding over another is called

friction

B

newton

C

Lubrication

D

fall bearing