CBSE Questions for Class 8 Physics Friction Quiz 6 - MCQExams.com

Friction is a force that opposes motion.
  • True
  • False
  • Ambiguous
  • Data insufficient
The efficiency of machine is reduced due to friction.
  • True
  • False
  • Ambiguous
  • Data insufficient
In cold weather, we rub our hands to warm them. The force involved in this is:
  • Static force.
  • Gravitational force.
  • Friction force.
  • Electrostatic force.
When a car accelerate rightwards, the friction acts towards leftwards.
  • True
  • False
  • Ambiguous
  • Data insufficient
Which one of the following can also act as a lubricant in machines?
  • Iron filling
  • Polish on machines
  • Flow of water through the machine
  • Flow of compressed and purified air.
The arrow with a pointed tip can move faster in air than that of with a blunt tip.
  • True
  • False
  • Ambiguous
  • Data insufficient
Brakes of a very small contact area are not used, although friction is independent of area. It is because friction:
  • causes wear and tear
  • depends on the nature of the material
  • resists motion
  • operating in this case is sliding friction
A ball moving on ground eventually stops. Mark the correct reason
  • Because no external force is applied on the ball by the surface
  • Because an object in motion should come to rest no matter what
  • Because of frictional force between ball and the ground
  • None of these
With increase of temperature, the frictional force acting between two surfaces:
  • increases
  • decreases
  • remains same
  • may increases or decreases
State whether the statements are true or false-
Frictional force is a non-contact force.
  • True
  • False
When a body is moving on a surface, the force of friction is called
  • Static friction
  • Kinetic friction
  • Limiting friction
  • Rolling friction
Friction produces.
  • Light
  • Alpha rays
  • Heat
  • All of these
State whether the statement are true or false-
Frictional force is a non-contact force.
  • True
  • False
Statement: Force of friction may oppose or support the motion of the body
  • True
  • False
When two surfaces are coated with lubricant, friction between the surfaces _______.
  • becomes zero
  • decreases
  • remains constant
  • increases
The water flowing over stones in a stream or river makes them round and smooth mainly due to
  • Static friction
  • Rolling friction
  • Fluid friction
  • Sliding friction
When a ball is left rolling on ground it stops after some time.What bring the rolling ball to rest?
  • Force of friction
  • Gravitational force
  • Air drag 
  • Buoyant force
Read the given statements and select the correct option.
$$Statement$$ $$1$$ : It takes a much longer time and covers more distance to stop a moving ship in water than a moving car with same speed on the road.
$$Statement$$ $$2$$ : The friction on water surface is much less than the solid surface.
  • Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
  • Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1.
  • Statement 1 is true but statement 2 is false.
  • Statement 1 is false but statement 2 is true.
Select the correct alternative:
Friction is increased if
  • An oil is sprayed
  • The surface are made wet
  • The surfaces are made dry
  • The surfaces are polished
If the outer surface of  a glass tumbler is greasy. it would become 
  • Difficult to hold it, because friction get increased
  • Difficult to hold it, because friction get reduced
  • Easier to hold it because friction get increased
  • Easier to hold it because friction get reduced
When walking on ice, one should take small steps to avoid slipping. Smaller steps help avoid slipping because they result in: 
  • Larger friction with the ice.
  • Smaller friction with the ice.
  • A larger normal force.
  • A smaller normal force.
Select the correct alternative:
Friction is reduced by
  • Making the surfaces wet
  • Making the surfaces dry
  • Making the surfaces rough
  • Sprinkling sand on the surface
Tick the most appropriate answer:
Force of friction comes into play when a/an
  • Object attempts motion
  • Moving object tries to stop
  • Object is at rest
  • All of the these
Tick the most appropriate answer:
If you pour some oil onto a floor, the friction would
  • Increase
  • Decrease
  • Remain the same
  • None of these
Friction for an object can be reduced by:
  • Providing wheels
  • Lubricating
  • Streamlining
  • All of the above
Tick the most appropriate answer:
A car skids on a wet or muddy road due to
  • Increased friction between the road and the tyres
  • Lubrication of brakes on a wet road
  • Reduced friction between the road and the tyres
  • Streamlined shape of the car
Which of the following is not an example of force acting at a distance ?
  • Force of gravity
  • Magnetic force
  • Electric force
  • Frictional force
When two surfaces are coated with a lubricant, then they.
  • Stick to each other
  • Slide upon each other
  • Roll upon each other
  • None of these
Which one of the following is not used to reduce friction.
  • Oil
  • Ball bearings
  • Sand
  • Graphite
Which substance cannot be used to reduce friction?
  • Oil
  • Grease
  • Gum
  • Graphite
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