12 practice sets · Page 1 of 1
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing orderwill be
wet marble floor, dry marble floor, newspaper and towel.
newspaper, towel, dry marble floor, wet marble floor.
towel, newspaper, dry marble floor, wet marble floor
wet marble floor, dry marble floor, towel, newspaper
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.
rolling, static, sliding
rolling, sliding, static
static, sliding, rolling
sliding, static, rolling
The sole of the shoes becomes plain after wearing it for several months. The reason is
Wearing out due to friction
Wearing out due to no friction
Sole is of bad quality
None of the above
A boat or an aeroplane has a pointed or tapering front / head. Why?
To increase the friction of fluid
To reduce the friction of fluid
To look good
For no reason
Four children were asked to arrange forces due to rolling, static and sliding frictions in a increasing order. Their arrangements are given below. Choose the correct arrangement.
Rolling, Static, Sliding
Static, Rolling, Sliding
Rolling, sliding, static
Sliding, Static, Rolling
The frictional force exerted by fluids is also called _____________
drug
drag
drop
drown
Sliding friction is ___________ than / to rolling friction
smaller
greater
equal
None of the above
Lubricants are substances which
Increases friction
Are used to light fire
Reduces friction
Are used to put off fire
Tyres are treaded to
To look good
Increase friction
To increase its longivity
To increase weight of the tyre
A matchstick struck on a matchbox catches fire easily because
Friction may cause fire
of chemical reaction
Force heated the match stick
None of the above
Spring balance is a device used for measuring the _____________ acting on an object.
mass
pressure
force
None of the above
It is difficult to walk on any oily floor because
Floor gets spoiled
There is more resistance
Force of friction is high
Force of friction is very less
