CBSE Questions for Class 8 Physics Friction Quiz 1 - MCQExams.com
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect

It is difficult to walk on ice because of:
  • absence of friction.
  • absence of inertia.
  • more inertia.
  • more friction.
If we imagine ideally smooth surfaces kept in contact, the frictional force acting between them is :
  • zero
  • a finite value but not zero
  • very large
  • we can’t predict
Aeroplanes are streamlined to reduce:
  • fluid friction.
  • sliding friction.
  • kinetic friction.
  • limiting friction.
Sand is dusted to the railway tracks during rainy season to:
  • make it always wet
  • increase the friction
  • reduce the consumption of fuel
  • make it always dry
Which among the following is best lubricant?
  • Solids
  • Liquids
  • Gases
  • Both B and C
The limiting friction between two surfaces does not depend
  • on the nature of two surfaces.
  • on normal reaction.
  • on the weight of the body.
  • on height of the body.
A good lubricant should be highly
  • viscous and volatile
  • non-viscous and non-volatile
  • viscous and non-volatile
  • transparent
A ball moving on a table top eventually stops. What is the reason ?
  • due to gravity.
  • due to friction between the ball and table
  • due to other external force.
  • none of these.
In a large commercial complex there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is:
  • loose soil
  • polished marble
  • bricks
  • gravel surface
Friction is a force that oppose motion.
  • True
  • False
When a coin and a feather are dropped simultaneously from the same height, the coin strikes the ground first. This is because of:
  • gravitational force
  • mass of coin
  • friction
  • none of these
Friction should always be avoided.
  • True
  • False
Any substance which is used to reduce the roughness of a surface is called a:
  • Lubricant
  • Lubrant
  • Lubrication
  • None of these
Friction can be increased by increasing:
  • Smoothness of the surface
  • Grease on the surface
  • Roughness of the surface
  • Lubricating the surface
If we apply oil on door hinges, the friction will:
  • increase
  • decrease
  • disappear altogether
  • will remain unchanged
The friction between moving surfaces in contact can be increased by polishing them.
  • True
  • False
The opposing force that is caused due to relative motion between two surfaces in contact is called ....................... .
  • Frictional force
  • Electrostatic force
  • Magnetic force
  • Gravitational force

When a boy tries to push a heavy box placed on a rough surface, the box does not move because of an opposing force called :
  • friction
  • normal force
  • rigid force
  • uniform force
Which of the following is used to reduce friction in a rotating machine?
  • wheels
  • rollers
  • ball bearing
  • polishing
In which of the following cases more friction is desirable?
  • Movement of piston in a cylinder
  • Braking of a vehicle
  • Skating on a track
  • All of the above
Which of the following material is likely to have least friction?
  • wood
  • plastic
  • glass
  • paper
The frictional force exerted by fluids is called:
  • lift
  • drag
  • rolling friction
  • dynamic friction
Friction is a type of:
  • Resistance force
  • Non contact force
  • Contact force 
  • None
Powder is used in carrom board for:
  • Increasing friction
  • Decreasing friction
  • Decoration
  • None of the above
The surface of a table is smoother as compared to that of a road. This is due to:
  • Irregularities in the surface of road
  • Polishing of the table
  • Both $$A$$ and $$B$$
  • None of these
A coin flicked across a table will stop, because:
  • It is heavy
  • No force is acting on it
  • Earth attracts the coin
  • Table exerts a frictional force
Powder is a lubricant
  • True
  • False
  • None
  • Can't say
To keep machines running smoothly and to avoid wear and tear of machines, the best and the most commonly used lubricant is:
  • Powder
  • Sand
  • Oil
  • Water
The soles of our shoes wears out because:
  • soles are made of poor material
  • of poor design
  • of friction
  • none of the above
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