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Class 8 Science
Force And Pressure
Quiz 1
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When a given force is applied on larger area of contact the pressure exerted by it:
0%
increases
0%
decreases
0%
does not change
0%
none of these
Explanation
When a given force is applied on larger area of contact than the pressure exerted by it decreases.
The pressure exerted by a liquid:
0%
decreases with depth
0%
does not change with depth
0%
increases with depth
0%
is different in different directions at he same depth
Explanation
The pressure exerted by a liquid increases with depth.
A force can:
0%
change the state of motion
0%
change the shape of an object
0%
change the direction of motion of an object
0%
all of these
Explanation
A force can change the state of motion, shape of an object arid the direction of motion of an object.
Force is:
0%
only push on an object
0%
only pull on an object
0%
either push or pull on an object
0%
none of these
Explanation
Force is either push or pull on an object.
Liquids exert pressure on the walls of the container:
0%
yes
0%
no
0%
can’t say
0%
none of these
Explanation
Yes, liquids exert pressure on the walls of the container.
The pressure exerted by the air is known as:
0%
air pressure
0%
gas pressure
0%
atmospheric pressure
0%
none of these
Explanation
Atmospheric pressure is pressure exerted by the air.
When a rubber sucker is pressed on a plane surface than it sticks to the surface because of :
0%
the pressure exerted by us
0%
the air sucked by rubber
0%
the pressure of atmosphere acting on it
0%
none of these
Explanation
A rubber sucker sticks to the plane surface because of the pressure of atmosphere acting on it.
The instrument used of measure atmospheric pressure is:
0%
mercury barometer
0%
manometer
0%
pressure meter
0%
none of these
Explanation
Mercury barometer is the instrument used to measure atmospheric pressure.
The force exerted on a normal human being due to atmospheric pressure is:
0%
2 x 104N
0%
2 x 105N
0%
2 x 106N
0%
none of these
Explanation
2 x 105 N force is exerted on a normal human being due to atmospheric
The weight of air that every square centimetre of any surface carries is:
0%
1 kg
0%
10 kg
0%
1 gm
0%
100 kg
Explanation
1 kg is the weight of air that every square centimetre of any surface carries.
When bicycle tube is punctured than:
0%
it bursts
0%
air escapes very fast
0%
air escapes slowly
0%
none of these
Explanation
When bicycle tube is punctured than air escapes slowly.
We are not crushed under the weight of air because:
0%
air has no weight
0%
the pressure inside our bodies is equal to atmospheric pressure
0%
the pressure inside our bodies is more than atmospheric pressure
0%
none of these
Explanation
We are not crushed under the weight of air because the pressure inside our bodies is more than atmospheric pressure.
The non-contact force is:
0%
magnetic force
0%
electrostatic force
0%
force of gravity
0%
all of these
Explanation
Magnetic force, electrostatic force, force of gravity, all are non-contact forces.
A boat comes to rest if we stop rowing it due to:
0%
gravitation force
0%
force of friction
0%
muscular force
0%
none of these
Explanation
A boat comes to rest if we stop rowing it due to force of friction.
Which of the following is contact force:
0%
force of gravity
0%
magnetic force
0%
force of friction
0%
electrostatic force
Explanation
Force of friction is contact force.
Pressure =
0%
force/area
0%
force x area
0%
area/force
0%
none of these
Explanation
Pressure is force/area.
Knives, needles, saws are made sharp or pointed to:
0%
decrease pressure
0%
can’t say
0%
increase pressure
0%
none of these
Explanation
Knives, needles, saws are made sharp or pointed to increase pressure because decreasing area of contact increases pressure.
The pressure with the height of the liquid column.
0%
increase
0%
remains same
0%
decrease
0%
none of these
Explanation
The pressure increases with the height of the liquid column.
By decreasing the contact area the pressure:
0%
is decreased
0%
remain same
0%
is increased
0%
none of these
Explanation
By decreasing the contact area the pressure is increased.
The unit of pressure is:
0%
Newton
0%
Newton/metres
0%
Newton metres
0%
Newton/metre
Explanation
The unit of pressure is Newton/metres.
0 h : 0 m : 1 s
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