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Class 8 Science
Friction
Quiz 1
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The hinges of creaking doors are oiled to:
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keep them clean
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open and close them easily
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reduce noise and wears and tear
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none of these
Explanation
The hinges of creakingly doors are oiled to reduce noise and wear and tear.
Which of the following is true about friction:
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Friction can only slow things down
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Friction is a force that only occurs when an object moves
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Friction is a force that only occurs on rough surfaces
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Friction is a force that occurs only between solids
Explanation
Friction is a force that only occurs when an object moves.
Talcum powder should not be spilled on the floor of room because:
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it will stain the floor
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it may cause us to slip and fall
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it is messy
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none of these
Explanation
Talcum powder should not be spilled on the floor of room because it may cause us to slip and fall.
The easiest way to move a heavy wooden crate is to:
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place it on a trolley
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tie a rope one end and pull
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push it
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none of these
Explanation
The easiest way to move a heavy wooden crate is to place it on a trolley.
The two common forces that are acting everywhere around us are:
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gravity and friction
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gravity and magnetic force
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electrostatic force and gravity
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friction and magnetic force
Explanation
The two common forces that are acting eveiywhere around us are gravity and friction
If we apply the force along the right, the friction acts along the:
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right direction
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left direction
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can’t say
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none of these
Explanation
If we apply the force along the right, the friction acts along the left direction.
Which of the following is true:
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We write on a paper with pen due to friction
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A nail is fixed in the wall due to friction
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Soles of shoes wear out due of friction
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All of these
Explanation
All the activities given occur due to friction.
Gymnasts apply some coarse substance on their hands to:
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increase friction for better grip
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decrease friction
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play fast
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none of these
Explanation
Gymnasts apply some coarse substances on their hands to increase friction for better grip.
In which of the following friction is troublesome:
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sharpening a knife by rubbing it against a stone
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applying the brekes to stop a cycle.
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walking on a wet road
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rubbing the matchstick with the side of matchbox before burning it
Explanation
Walking on a wet road.
In which of the following friction is helpful:
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the engine of car becomes hot after running for some time
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soles of shoes were out after sometime
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pulling a drawer out of a desk
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using a towel to open a tightly closed lid of a bottle
Explanation
Friction is helpful in using a towel to open a tightly closed lid of a bottle.
Function can be reduced by:
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using lubricants
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polishing
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using fine powder
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all of these
Explanation
Friction can be reduced by using lubricants, polishing and fine powder.
Drag is:
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frictional force exerted by solids
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frictional force exerted by liquids
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frictional force exerted by gases
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frictional force exerted by fluids
Explanation
Drag is frictional force exerted by fluids.
When one body roth over the surface of another body, the resistance to Its motion is called:
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sliding friction
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rolling friction
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static friction
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none of these
Explanation
When one body rolls over the surface of another body, the resistance to its motion is called rolling friction.
Friction the rehuye motion between Io surfaces In contact.
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favours
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opposes
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is
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none of these
Explanation
Friction opposes the relative motion between two surfaces in contact.
To increase friction:
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the surface is made smooth
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the surface is polished
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the surface is made rough
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powder is sprinkled on the surface
Explanation
To increase friction the surface is made rough, smooth, polished and powdered surface decrease friction.
Which of the following has least friction:
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rolling friction
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static friction
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sliding friction
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none of these
Explanation
Rolling friction has least friction.
Ball hearing:
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reduces friction
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increases friction
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make no change in friction
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none of these
Explanation
Ball-bearing reduces friction.
The frictional force of smooth surface is:
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less
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more
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zero
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none of these
Explanation
The frictional force of smooth surface is less.
This type of friction is the most powerful of all types of frictions:
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static
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rolling
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sliding
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drag
Explanation
Static friction is the most powerful of all types of frictions.
When two objectives are already moving the friction between them is called:
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rolling friction
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static friction
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sliding friction
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friction of fluid
Explanation
When two objects are already moving the friction between them is called static friction
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