21.
If area of contact is increased, then
A
pressure increases
B
pressure decreases
C
pressure remains constant
D
none of these
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If area of contact is increased, then
pressure increases
pressure decreases
pressure remains constant
none of these
Magnetic force causes
attraction only
repulsion only
both attraction and repulsion
none of these
One pascal is the pressure generated by
force of 1 N on 1 m2
force of 1 kgf on 1 m2
force of 1 N on 1000 cm2
force of 1 N on 1 cm2
Rockets have a special streamlined body in order to
increase friction
reduce friction
make them attractive
none of these
The deep grooves in the tyre of a tractor
decrease friction
increase friction
make it stable
make tyre more attractive
The force of friction
increases with the weight of body
decreases with the weight of body
is not affected by the weight of body
none of these
The force which an object exerts on any other object is
gravitational force
magnetic force
electrostatic force
frictional force
The magnetic force is a
contact force
force at distance
consequential force
none of these
The SI unit of force is
joule
kg/m2
newton
pascal
The unit of pressure is
joule
newton
pascal
none of these
To increase pressure
area of contact is increased
area of contact is decreased
magnitude of thrust is decreased
none of these
Tyres are provided with deep grooves on their surface to
reduce the cost of material used
increase the friction
decrease the friction
make them attractive
Wheel is made circular, because
it minimises friction
it increases friction
to make them attractive
none of these
With the increase in the weight of an object the pressure
increases
decreases
remains unchanged
none of these