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CBSE Questions for Class 8 Physics Force And Pressure Quiz 2 - MCQExams.com
CBSE
Class 8 Physics
Force And Pressure
Quiz 2
A force cannot be seen but the effect of force can be felt.
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True
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False
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Ambiguous
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Data insufficient
Explanation
A force
is a push or pull upon an object resulting from the object's
interaction with another object. A
force is not a physical object that can be seen. However, the effect of a force on an object can be seen (i.e. change in its speed, direction of motion, shape and size, etc.)
A force is a result of:
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interaction between two bodies
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interaction of one body with itself
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friction
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all of the above
Explanation
One object exerts a force on the other object due to their mutual interaction when the objects either are in contact with each other or placed at certain distance apart.
Hence a force is a result of interaction between two bodies.
Which of the following property of a substance cannot be changed by application of force?
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Shape
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Size
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Elasticity
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Reactivity with water
Explanation
The application of force only changes the physical state of the substance but not the chemical state (properties). As reactivity of substance with water is a chemical property, thus it will not be affected due to the application of force.
State True or False :
Gravity of Earth, attracts all objects towards the centre of Earth.
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True
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False
Explanation
The Earth is one massive object whose gravitational force is very strong. Thus gravity of Earth attracts all objects towards the centre of Earth.
State True or False :
Magnetic force attracts all kinds of metals.
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True
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False
Explanation
Magnetic force only attracts metals, which are ferromagnetic. Not all metals are ferromagnetic.
Which of the following class of forces is different from others?
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Pulling of a cart
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Stretching of a coiled spring
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Kicking of a football
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Weight of the body
Explanation
Pulling of a cart, stretching of a coiled spring and kicking of a ball take place due to contact forces but weight of the body (gravitational force) is a non-contact force.
Hence option $$D$$ is correct.
When a rubber ball is pressed between hands, its shape changes. This happens because of
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Balanced forces acting on the ball
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Unbalanced forces acting on the ball
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Gravitational forces acting on the ball
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Frictional forces acting on the ball
Explanation
Unbalanced forces from the hands press the ball from two sides. This causes the shape of the ball to change.
Fill in the blanks:
A push or a pull on an object are types of ________.
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pressure
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attraction
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repulsion
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force
Explanation
Force is required to move a stationary object, to stop a moving object, etc. The phenomenon required to push or to pull on object is force.
Which of the following represents the SI unit
of force?
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Dyne
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Gram-weight
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Newton
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Kilogram-weight
Explanation
Option C is correct.
$$ F= ma$$
In S.I unit system,
unit of force is $$kg\ m/s^2= Newton$$
S.I unit of Force is newton and it is represented by $$N$$.
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Both Statement 1 and Statement 2 are true and Statement 2 is the correct explanation of Statement 1.
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Both Statement 1 and Statement 2 are true but Statement 2 is not the correct explanation of Statement 1.
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Statement 1 is true and Statement 2 is false.
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Both Statement 1 and Statement 2 are false.
Explanation
As we know an object that is in motion will not change its velocity unless net external force acts upon it. So there will be no net action of external force on an object moving with uniform velocity.
If multiple forces are acting on a deformable body and resultant of these forces are zero then this combination of force will not change motion but it will change the shape of the object.
Hence, both Statement 1 and Statement 2 are true but Statement 2 is not the correct explanation of Statement 1.
Option D.
Which picture shows a pull force acting?
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0%
0%
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Explanation
in case D,the gravitational pull acting downward.
Identify the action that can cause motion of a book placed on a table.
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Pulling
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Pushing
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Lifting
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All of the above
Explanation
The action involved in moving a book placed on a table can be pulling, pushing or lifting for which force is required.
Which of the following actions can be grouped as push?
a. A cricket ball hit by a batsman.
b. A football player kicking the ball.
c. A girl is shutting the open door of a refrigerator.
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Only a
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Only a and b
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only b and c
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a, b and c
Explanation
All the above examples can be grouped as push. As the force is applied to move the object away.
Identify the type of force involved when loaded cart is moved.
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Lifting
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Pulling
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Running
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Reading
Explanation
To move a loaded cart we have to pull it . Hence action involved is as pulling.
The action of a force on an object imparts:
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motion.
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change in shape.
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change in size.
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all of these
Explanation
The action of a force on an objects can result in:
1. Movement of an object.
2. Change in size of an object.
3. Change in shape of an object.
Which of the following actions can be grouped as pull:
a. Moving a loaded cart
b. Applying brakes while driving car
c. Drawing a bucket of water from a well
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Only a
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a and b
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b and c
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a and c
Explanation
For moving a loaded cart and drawing a bucket of water from a well, the action involved is pulling hence can be grouped as Pull.
Identify the type of force involved in opening the door of refrigerator.
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Pulling
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Pushing
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Heating
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Cooling
Explanation
The action involved to open the door of the refrigerator is pulling because the door is moving towards us. F
orce is applied by our arm to PULL the door of the refrigerator.
Group the following examples as a pull or a push or both?
(i) Opening a drawer
(ii) Opening or shutting a door
(iii) Hitting a ball
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Pull - (i)
Push and Pull - (ii)
Push (iii)
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Pull - (ii)
Push and Pull - None
Push (i & iii)
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All are examples of pushing
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All are examples of pulling
Explanation
To open a drawer action involved is pull, for opening and shutting a door both action is involved, hitting a ball pushing involved.
Identify the action involved when a magnet attracts a piece of iron towards it.
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Pushing
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Pulling
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Flying
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Picking
Explanation
When a magnet is placed near to the pieces of iron, it pulls the pieces of iron towards itself due to it's magnetic field action . So the action involved is pulling.
Fill in the blanks:
An interaction of one object with another object results in a _________ between the two objects.
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Pressure
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Attraction
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Force
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Repulsion
Explanation
When one object interacts with another object they exert force on each other, either towards or away from each other.
Identify the action involved in opening or shutting a door.
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Pulling
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Pushing
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Both a and b
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None of the above
Explanation
We need to apply a PULL when trying to open a door.
We need to apply a PUSH when trying to close a door.
When you and your friend push a table in opposite directions, it becomes difficult to move. This is because:
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the net force becomes the sum of the two forces.
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the net force becomes the difference of the two forces.
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the table becomes heavier.
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the table becomes lighter.
Explanation
When two forces are applied in opposite directions, the net force becomes the difference of the two. So, the net force becomes small and the table becomes difficult to move.
In the game of tug-of-war, the team that pulls the rope harder wins the game. This is because:
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the rope moves in the direction of larger force.
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the rope moves in the direction of the smaller force.
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the rope does not move at all.
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the rope moves in the direction of product of the forces.
Explanation
In a game of tug-of-war, teams apply forces in terms of pulls on the rope. On the rope, two pulls act in opposite directions. The net force becomes the difference of the two forces (pulls) and the rope moves in the direction of the larger force (pull).
What happens when there is no interaction between the objects?
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Force comes in action.
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Force does not come in action.
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Force may or may not come in action.
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None of the above is correct
Explanation
There are two types of force
1) Interactive force: Its effect comes when two objects will come in contact.
2) Non- Interactive force: Its effect will come when an object comes in their respective field strength.
exp: Charge in an electric field, Mass in gravitation field.
Hence Option C.
What happens when two forces are applied in the opposite direction on an object?
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Net force is the addition of forces.
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Net force is the subtraction of forces.
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Net force is the division of forces.
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Net force is the multiplication of forces.
Explanation
When two forces are applied in the opposite direction on an object, the net force will be the difference between the two forces.Because both forces in opposite direction opposes each other.Hence net effect is reduced.
When you and your friend pushes heavy table in the same direction, it becomes easier to move. This is because:
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the net force is the sum of forces.
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the net force is the difference of forces.
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the table becomes lighter.
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friction reduces.
Explanation
When you and your friend pushes heavy table in the same direction, the force applied by you and your friend get added. So, applied forces sum up to get a larger force. Hence the table moves easily.
Fill in the blanks:
In the game of tug-of-war, both the teams pulls each other. So ________.
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force is applied due to interaction.
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force is not applied although there is interaction.
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force is applied although there is an interaction.
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none of the above.
Explanation
Force always comes into action when there will be interaction between the objects, Here both the teams are exerting force on each other through the rope.
What happens when two forces are applied to an object in the same direction?
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Forces add up
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Forces subtract
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Resultant force is the division of forces
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None of the above
Explanation
When two forces are applied on a object in the same direction, forces added up and net force increases.
Fill in the blanks:
Force comes into action when ________.
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objects interact.
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objects do not interact.
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object move.
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None of these
Explanation
When two body interact with each other then momentum of body will change that change in momentum of the body is effect of mutual force between them.
Fill in the blanks:
The net force is ______ than the individual applied forces.
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Either larger or smaller
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Always smaller
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Always greater
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Always equal
Explanation
The net force is the resultant force of all the individual applied forces. So, the force is either larger or smaller than individual forces, because force is a vector quantity.
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