Class 8 Practice – Level 1 – Frication Solutions

Total questions: 40

Friction is a force that always acts in which direction?

Along the direction of motion

Opposite to the direction of motion

Perpendicular to the direction of motion

At an angle to the direction of motion

None

What type of friction acts when an object is at rest on a surface?

Sliding friction

Rolling friction

Static friction

Fluid friction

None

Which of the following activities is made possible due to friction?

Walking on the ground

Gliding on ice

Floating on water

Falling through air

None

What device is commonly used to measure frictional force?

Spring balance

Thermometer

Voltmeter

Barometer

None

Which factor does not affect friction?

Surface roughness

Weight of the object

Area of contact

Type of material

None

Friction that acts on objects moving through a fluid is called:

Static friction

Fluid friction

Sliding friction

Rolling friction

None

Friction helps in which of the following actions?

Writing with a pen

Polishing surfaces

Reducing energy loss

Making surfaces slippery

None

Which of the following is a method to reduce friction?

Using rough surfaces

Using lubricants

Increasing the weight of an object

Using larger surfaces

None

Which of these has the highest frictional force?

Rolling friction

Fluid friction

Sliding friction

Static friction

None

10.

What is the main cause of friction?

Temperature differences

Gravitational force

Roughness of surfaces

Size of objects

None

11.

Which of these is NOT an effect of friction?

Produces heat

Causes wear and tear

Reduces efficiency

Reduces weight

None

12.

Friction converts kinetic energy into:

Potential energy

Mechanical energy

Thermal energy

Electrical energy

None

13.

Why are lubricants used in machines?

To increase friction

To decrease friction

To make them heavier

To make them rust-proof

None

14.

Which friction is experienced by a ball rolling on a floor?

Sliding friction

Rolling friction

Static friction

Fluid friction

None

15.

Which type of friction is also known as air resistance?

Sliding friction

Rolling friction

Static friction

Fluid friction

None

16.

Friction in machines often leads to:

Energy conservation

Reduced wear and tear

Increased efficiency

Generation of unwanted heat

None

17.

Which of these surfaces is likely to have the least friction?

Sandpaper

Carpet

Polished marble

Concrete

None

18.

Which statement is true regarding static and sliding friction?

Static friction is less than sliding friction.

Sliding friction is greater than static friction.

Static friction is generally greater than sliding friction.

They are always equal.

None

19.

Wheels on a vehicle help to reduce friction because they:

Increase static friction

Decrease fluid friction

Convert sliding friction to rolling friction

Increase surface roughness

None

20.

Which of these objects relies on friction to function effectively?

Ice skates

Ball bearings

Eraser

Balloon

None

21.

Which of the following actions would reduce friction in a bicycle chain?

Using thicker wheels

Applying oil

Roughening the chain

Adding weight

None

22.

In sports like skiing, reducing friction is essential. What is applied to skis to achieve this?

Sandpaper

Wax

Water

Rubber

None

23.

An example of fluid friction can be observed when:

A book slides on a table

A ball rolls on the floor

A fish swims in water

A person stands still

None

24.

Static friction comes into play:

Only when objects are moving

When objects are at rest

Only on smooth surfaces

Only in fluids

None

25.

Which device uses frictional heating to function?

Refrigerator

Electric fan

Matchstick

Light bulb

None

26.

In most cases, does increasing the area of contact increase friction?

Yes, it always increases friction

No, area of contact does not affect friction

Only if surfaces are rough

Only if the object is very heavy

None

27.

Friction acts in which direction relative to the applied force?

Same direction as applied force

Opposite direction to applied force

Perpendicular to the applied force

At an angle to the applied force

None

28.

Why are tires often made with grooves?

To reduce friction

To increase speed

To provide better grip

To make the vehicle heavier

None

29.

What is air resistance?

Static friction

Rolling friction

Fluid friction

Sliding friction

None

30.

Friction helps us in which of these activities?

Sleeping

Holding objects

Slipping on ice

Floating in water

None

31.

A ball stops rolling on the ground after some time due to:

Absence of force

Presence of friction

Too much air pressure

Weight of the ball

None

32.

Brakes in a vehicle are based on which principle?

Increasing speed

Reducing weight

Creating friction

Decreasing size

None

33.

Why is it difficult to walk on ice?

Ice is a solid

There is less friction on ice

Ice is heavy

Ice is slippery due to weight

None

34.

Which activity can cause wear and tear due to friction?

Reading a book

Running on rough ground

Sleeping

Drinking water

None

35.

A carpeted floor has more friction than a tiled floor because:

It is heavier

It has more grip

It is colorful

It attracts dust

None

36.

Friction converts kinetic energy into which form of energy?

Light

Sound

Chemical

Heat

None

37.

Which material on tires helps reduce wear and provides durability?

Rubber

Metal

Plastic

Paper

None

38.

Which of these reduces friction in machinery?

Adding weights

Using magnets

Applying grease

Using sandpaper

None

39.

Friction is sometimes undesirable because it:

Helps in walking

Causes overheating in machines

Prevents slipping

Provides grip

None

40.

Friction is:

A force that resists motion

A force that increases speed

A force that only acts on liquids

A force that decreases with weight

None

1 out of 40

Time's up

Class 8 Practice – Level 1 – Frication Solutions

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