CBSE Questions for Class 8 Physics Force And Pressure Quiz 8 - MCQExams.com

Force divided by _______ is called pressure.
  • $$Area$$
  • $$\sqrt{Area}$$
  • $${Area}^{2}$$
  • None of the above
The foundations of high rise building are kept wide so that they exert less pressure on the ground and prevent the building from sinking into the ground.
  • True
  • False
  • Ambiguous
  • Data insufficient
A force of $$500 N$$ acts on a square piece of plywood, each of whose sides is $$5 m$$ long. Calculate the pressure acting on the piece of plywood.
  • $$500 Nm^{-2}$$
  • $$100 Nm^{-2}$$
  • $$2500 Nm^{-2}$$
  • $$20 Nm^{-2}$$
State whether true or false:
A boy throws a ball down from the second floor of a building. In this case, electrostatic force is acting on the ball.
  • True
  • False
When a force acts on a large area, the pressure it exerts is more.
  • True
  • False
  • Ambiguous
  • Data insufficient
A force of $$400 N$$ exerts a pressure of $$20 N/cm^{2}$$. What is the area on which the force acts?
  • $$20m^{2}$$
  • $$20cm^{2}$$
  • $$1cm^{2}$$
  • $$10cm^{2}$$
A boy stands on the ground. The area below his feet is $$70 cm^{2}$$. The pressure he exerts on the ground is $$7 N/cm^{2}$$. Calculate the total force acting on the ground.
  • $$0.1 N$$
  • $$10 N$$
  • $$490 N$$
  • $$4.9 N$$
In the frozen northern regions of Canada, the Eskimos wear large snowshoes as that help them to walk on freshly fallen snow.
  • True
  • False
  • Ambiguous
  • Data insufficient
A force exerts a pressure of $$45 N/m^{2}$$ when it acts on an area of $$10 m^{2}$$. Calculate the total force
  • $$4.5 N$$
  • $$450 N$$
  • $$45 N$$
  • $$.45 N$$
Which of the pictures shows that a force changes the shape of an object?
Following diagram shows a moving tennis ball is hit by a player. What effect of the force is shown in the below picture ?
302296_b73dd816a74d4049b162487a83b4e2e1.png
  • The force changes the direction of the moving object
  • The force changes the mass of the moving object
  • The force changes the shape of the moving object
  • The force can stop the moving object
You want to lift a heavy box. The force of gravity pulls it downwards with a force of $$500N$$. Your father applies an upward force of $$220 N$$ from below. How much force will you have to apply to lift it upwards?
  • $$720 N$$
  • $$280 N$$
  • $$180 N$$
  • $$380 N$$
The bags and suitcases are provided with broad handles so that the __________ exerted on the hand while carrying them is minimum.
  • pressure
  • thrust
  • force
  • friction
It is difficult to walk bare feet on a sandy ground as the sand :
  • is coarse, rough and irritating and gets everywhere
  • flies away
  • has crabs hiding in them
  • yields under our weight
The gravitational force is a:
  • Contact force
  • Action at a distance force
  • Non-contact force
  • Both $$B$$ and $$C$$
In the picture shown below, the man is
302282_9e7eb49b06294bb2aa74e23f492cbc19.png
  • Applying no force on the stool
  • Applying pressure on the stool
  • Applying force on the stool
  • Both $$(B)$$ & $$(C)$$
In a simple pendulum, when the bob is in rest in the central position, the forces are
  • balanced
  • unbalanced
  • sometimes balanced and sometimes unbalanced
  • none of these
When the piston of a pump is pulled up, the pressure inside_____
  • decreases
  • increases
  • remains same
  • none of the above
Suppose a ball is kept still on a level surface of a table.  At this condition, the ball is acted upon by _______.
  • Magnetic force
  • Gravitation force
  • Muscular force
  • No force at all
In a game of tug of war, three girls of team $$A$$ pull the rope with forces of $$100 N$$, $$120 N$$ and $$170 N$$. In team $$B$$, the three members pull the rope with forces of $$130 N$$, $$150 N$$ and $$155 N$$. Who will win the tug of war? What is the resultant force?
  • Team $$A$$, $$55 N$$
  • Team $$B$$, $$55 N$$
  • Team $$A$$, $$45 N$$
  • Team $$B$$, $$45 N$$
When the eraser presses on a paper with a force of $$1$$ N  the paper experiences a pressure of $$10,000$$  Pa. Find the area of contact between the eraser and the paper.
  • $$ \displaystyle 1 cm^{3} $$
  • $$ \displaystyle 10 cm^{2} $$
  • $$ \displaystyle 1 cm^{6} $$
  • $$ \displaystyle 1 cm^{2} $$
What will be the net force acting on an object when two equal forces are applied on an object in opposite directions?
  • Sum of the forces.
  • Zero
  • Equal to each of the applied forces.
  • Difference of the forces.
The weight of a man is $$750$$ N. The total area of the soles of his shoes is $$250$$ $$ \displaystyle cm^{2} $$. Find the pressure he applies on the floor
  • $$30000 Pa$$
  • $$150 Pa$$
  • $$300 Pa$$
  • $$3\times10^{6} Pa$$
When a force is exerted on an object without any contact, the force is known as _______.
  • Contact force
  • Non-contact force
  • Muscular force
  • None of these
A person used force ($$F$$), shown in the figure to move a load with a constant velocity on a given surface.
Identify the correct surface profile.
430492.png
Which of the following statements is incorrect?
  • Pressure cooker cooks food faster than open utensil
  • At higher altitudes the food is not cooked properly in open utensil due to low atmospheric pressure
  • At high pressure temperature becomes more than $$100^\circ$$C and food cooks faster
  • All of these
  • None of these
Force can only increase or decrease the speed of a moving object or change its direction.
  • True
  • False
  • Both
  • None
Why does a straw get attracted towards another straw which is rubbed with a sheet of paper?
  • Due to friction force
  • Due to electrostatic force
  • Due to magnetic force
  • Due to gravitational force
The air pressure inside our body is equal to the ____?
  • internal pressure
  • atmospheric pressure
  • both a and b
  • none of the above
What happens, when the pressure inside a sealed bottle exceeds the atmospheric pressure?
  • The bottle bursts out
  • The bottle gets crushed
  • The bottle remains as it is
  • None of the above
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