# 8th Class Science Friction Question Bank

### done Fraction

• A) Contact force

B) Non-contact force

C) Electrostatic force

D) Magnetic force

• A) 7 N

B) Greater than 7 N

C) Less than 7 N

D) 14 N

• A) Wood

B) Cardboard

C) Glass

D) Paper

• A) Wheels

B) Rollers

C) Ball bearings

D) Handle

• A) Movement of piston in a cylinder

B) A vehicle speeding

C) Running on a track

D) All of the above

• A) For increasing friction

B) For decreasing friction

C) For decoration

D) For fragrance

• A) Rolling is easier than sliding.

B) Sliding is easier than rolling.

C) Dragging is easier than sliding.

D) Dragging is easier than rolling.

• A) Lift

B) Drag

C) Rolling friction

D) Dynamic friction

• A) To increase friction

B) To decrease weight

C) To reduce friction

D) To increase weight

• A) Rolling < static < sliding friction

B) Static > sliding > rolling friction

C) Static > rolling > sliding friction

D) Sliding < static < rolling friction

• A) Dragging the drum

B) Lifting the drum

C) Rolling the drum

D) All of the above need the same effort

• A) Due to gravitational pull

B) Due to the heat of the earth

D) Due to excess friction in air

• A) To increase friction

B) To decrease friction

C) To increase the amount of heat

D) To decrease the amount of heat

• A) As a decoration

B) To increase friction

C) To decrease friction

D) To give shape

• A) Muscular force of our body

B) Gravitational pull by the earth

C) Frictional force

D) Balanced forces of nature

• A) Friction can be reduced by converting sliding friction into rolling friction.

B) Friction in air and water can be reduced by streamlining the shape of the objects.

C) A polished surface will have less friction.

D) Friction can be reduced to zero.

• A) The object will stop.

B) The object will keep on moving.

C) The object will change speed.

D) The object will change direction.

• A) It enables the brakes of a car to work.

B) It allows us to hold a pen.

C) It helps us to sandpaper a table.

D) It wears out our shoes.

• A) The grooves of tyres flattened due to use

B) A rolling ball coming to a halt

C) Leaves falling from a tree

D) The holding of a pencil

• A) It is easy to inflate circular tyres.

B) Rolling friction is less than sliding friction.

C) Circular tyres dissipate less heat.

D) Circular tyres easily slow down or stop a vehicle.

• A) Water

B) Oil

C) Sand

D) Powder

• A) It is heavy.

B) No force is acting on it.

C) The earth attracts the coin.

D) The table exerts a frictional force.

• A) Smaller steps ensure larger friction.

B) Smaller steps ensure smaller friction.

C) Smaller steps ensure larger distance covered.

D) Smaller steps ensure smaller distance covered.

• A) Driving a car

B) Sitting on a chair

C) Rowing a boat

D) All of the above

• A) By using smooth surfaces

B) By using dry surfaces

C) By increasing the weight of the body

D) All of the above

• A) Static friction

B) Sliding friction

C) Limiting friction

D) All of the above

• A) Holding a glass

B) Writing on a paper

C) Sitting on a chair

D) All of the above

• A) Walking

B) Running

C) Ice-skating

D) Rowing a boat

• A) Static friction

B) Sliding friction

C) Rolling friction

D) All of the above

• A) Low friction

B) Excess friction

C) High speed

D) External force

• A) Gravitational force is less in the case of the coin.

B) Mass of coin is less.

C) Frictional force is less in the case of the coin.

D) Magnetic force is stronger in the case of the coin.

• A) Due to the difference in the material of the sole

B) Due to poor design

C) Due to friction

D) Due to their size

• A) The ball will roll out of the glass bowl near edge 'Q'.

B) It will stop at centre point 'R' after a number of to-and-fro motions.

C) It will keep moving between point 'P' and 'Q' and will never stop.

D) It will not move at all since friction is required for movement.

• A) When no force is applied on a body at rest

B) When a large force is applied on a body

C) When a body is rolling on the surface

D) When a body is sliding on the surface

• A) Gravitational force

B) Electrical force

C) Frictional force

D) Magnetic force

• A)

 X Y Motion Weight

B)

 X Y Motion Friction

C)

 X Y Frication Weight

D)

 X Y Weight Motion

• A) Ice block reaches the bottom of the tray first.

B) Sand paper block reaches the bottom of the tray first.

C) Both the blocks reach the bottom of the tray at the same time.

D) Both the blocks offer the same amount of friction.

• A)

B)

C)

D)

•  (i) Striking a match stick (ii) Playing snooker (iii) Writing on the blackboard

A) Only (i) and (ii)

B) Only (ii) and (iii)

C) Only (i), and (iii)

D) (i), (ii) and (iii)