The hinges of creaking doors are oiled to:
  • keep them clean
  • open and close them easily
  • reduce noise and wears and tear
  • none of these
Which of the following is true about friction:
  • Friction can only slow things down
  • Friction is a force that only occurs when an object moves
  • Friction is a force that only occurs on rough surfaces
  • Friction is a force that occurs only between solids
Talcum powder should not be spilled on the floor of room because:
  • it will stain the floor
  • it may cause us to slip and fall
  • it is messy
  • none of these
The easiest way to move a heavy wooden crate is to:
  • place it on a trolley
  • tie a rope one end and pull
  • push it
  • none of these
The two common forces that are acting everywhere around us are:
  • gravity and friction
  • gravity and magnetic force
  • electrostatic force and gravity
  • friction and magnetic force
If we apply the force along the right, the friction acts along the:
  • right direction
  • left direction
  • can’t say
  • none of these
Which of the following is true:
  • We write on a paper with pen due to friction
  • A nail is fixed in the wall due to friction
  • Soles of shoes wear out due of friction
  • All of these
Gymnasts apply some coarse substance on their hands to:
  • increase friction for better grip
  • decrease friction
  • play fast
  • none of these
In which of the following friction is troublesome:
  • sharpening a knife by rubbing it against a stone
  • applying the brekes to stop a cycle.
  • walking on a wet road
  • rubbing the matchstick with the side of matchbox before burning it
In which of the following friction is helpful:
  • the engine of car becomes hot after running for some time
  • soles of shoes were out after sometime
  • pulling a drawer out of a desk
  • using a towel to open a tightly closed lid of a bottle
Function can be reduced by:
  • using lubricants
  • polishing
  • using fine powder
  • all of these
Drag is:
  • frictional force exerted by solids
  • frictional force exerted by liquids
  • frictional force exerted by gases
  • frictional force exerted by fluids
When one body roth over the surface of another body, the resistance to Its motion is called:
  • sliding friction
  • rolling friction
  • static friction
  • none of these
Friction the rehuye motion between Io surfaces In contact.
  • favours
  • opposes
  • is
  • none of these
To increase friction:
  • the surface is made smooth
  • the surface is polished
  • the surface is made rough
  • powder is sprinkled on the surface
Which of the following has least friction:
  • rolling friction
  • static friction
  • sliding friction
  • none of these
Ball hearing:
  • reduces friction
  • increases friction
  • make no change in friction
  • none of these
The frictional force of smooth surface is:
  • less
  • more
  • zero
  • none of these
This type of friction is the most powerful of all types of frictions:
  • static
  • rolling
  • sliding
  • drag
When two objectives are already moving the friction between them is called:
  • rolling friction
  • static friction
  • sliding friction
  • friction of fluid
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0