9. Friction

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9. Friction

MCQ"s Test

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1. The hinges of creaking doors are oiled to: *

1 point

open and close them easily

none of these

keep them clean

reduce noise and wears and tear

2. A matchstick catches fire when struck against the side of the matchbox because: *

1 point

friction produces a spark and the

none of these chemicals catches fire

of the chemicals

of friction

3. Which of the following is true about friction: *

1 point

Friction is a force that occurs only between solids

Friction can only slow things down

Friction is a force that only occurs on rough surfaces

Friction is a force that only occurs when an object moves

4. Talcum powder should not be spilled on the floor of room because: *

1 point

it will stain the floor

it may cause us to slip and fall

it is messy

none of these

5. The easiest way to move a heavy wooden crate is to: *

1 point

tie a rope one end and pull

place it on a trolley

push it

none of these

6. The two common forces that are acting everywhere around us are: *

1 point

electrostatic force and gravity

gravity and friction

friction and magnetic force

gravity and magnetic force

7. If we apply the force along the right, the friction acts along the: *

1 point

can’t say

left direction

none of these

right direction

8. Which of the following is true: *

1 point

Soles of shoes wear out due of friction

We write on a paper with pen due to friction

A nail is fixed in the wall due to friction

All of these

9. Gymnasts apply some coarse substance on their hands to: *

1 point

increase friction for better grip

decrease friction

play fast

none of these

10. In which of the following friction is troublesome: *

1 point

walking on a wet road

applying the brakes to stop a cycle.

sharpening a knife by rubbing it against a stone

rubbing the matchstick with the side of matchbox before burning it

11. In which of the following friction is helpful: *

1 point

soles of shoes were out after sometime

the engine of car becomes hot after running for some time

pulling a drawer out of a desk

using a towel to open a tightly closed lid of a bottle

12. Function can be reduced by: *

1 point

all of these

using fine powder

polishing

using lubricants

13. When one body roll over the surface of another body, the resistance to Its motion is called: *

1 point

static friction

none of these

sliding friction

rolling friction

14. Friction the relative motion between Io surfaces In contact. *

1 point

opposes

favours

none of these

15. To increase friction: *

1 point

the surface is made rough

the surface is made smooth

powder is sprinkled on the surface

the surface is polished

16. Which of the following has least friction: *

1 point

none of these

sliding friction

static friction

rolling friction

17. Ball hearing: *

1 point

increases friction

none of these

make no change in friction

reduces friction

18. Drag is: *

1 point

frictional force exerted by fluids

both (a) and (b)

none of these

frictional force exerted by solids

19. The frictional force of smooth surface is: *

1 point

less

none of these

zero

20. This type of friction is the most powerful of all types of frictions: *

1 point

drag

static

sliding

rolling

21. When two objectives are already moving the friction between them is called: *

1 point

sliding friction

rolling friction

friction of fluid

static friction

22. Ball-bearings are used to convert static friction into: *

1 point

none of these

drag

sliding friction

rolling friction

23. To convert the static, sliding friction into rolling friction, the heavy luggage carriers are attached with at their base. *

1 point

tyres

ball-bearings

chains

wheels

24. The force of friction between two bodies is: *

1 point

perpendicular to the contact surface

parallel to the contact surface

inclined at 60° to the contact surface

inclined at 30° to the contact surface

25. A coin pushed on a table stops because: *

1 point

the table exerts a frictional force on it

the earth attracts it

it is very heavy

no force acts on it

26. The main cause of wear and tear of machine is: *

1 point

friction acting between different moving parts

none of these

gravitational force of earth

poor quality of machine

27. Ball rolling on the floor stops due to: *

1 point

muscular force

gravitational force

frictional force

magnetic force

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