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CBSE Questions for Class 8 Physics Force And Pressure Quiz 3 - MCQExams.com
CBSE
Class 8 Physics
Force And Pressure
Quiz 3
In which direction does a car at rest move when pushed by a few persons?
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In the direction
opposite to
push
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In the direction of the push
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Making an acute angle with the push
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None of the above
Explanation
To move a car there must be interactions between the men and the car. The interaction is exerted in terms of push and the car moves in the direction of net force which is the direction of push, i.e., in the direction of the force applied.
What brings a change in the state of the motion of an object?
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The path of motion
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Mass of the object
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Force acting on the object
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Density of the object
Explanation
The speed and direction of motion can be changed by applying force on an object and thus a force can bring a change in the state of motion of an object.
Change in state of motion of an object can be described as:
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change in speed only.
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change in direction of motion only.
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change in either speed or direction.
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change in neither speed nor direction.
Explanation
A change in either the speed of an object or its direction of motion or both is described as a change in its state of motion.
The application of a force would result in a change in the state of motion of an compressible object. The given statement is:
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Always true.
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Not always true.
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Always false.
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Insufficient information
Explanation
Many a times, application of force does not result in a change in the state of motion. For example, no effect of force in the state of motion is observed when you try to push a wall.
What happen when a lump of dough on a plate is pressed down with your hands?
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Change in state of motion takes place.
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Change in shape takes place.
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Change in mass takes place.
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Both B and C
Explanation
Here, applied force changes the shape of the dough and compresses it. The dough still remains in a state of rest.
What happens w
hen a ball is set in motion by pushing it along a level surface and a moving ball strikes a small stone in its path?
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The direction of motion of the ball changes.
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The direction of motion of the ball remains the same.
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The moving ball stops.
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The ball bursts.
Explanation
When a moving ball strikes a small stone in its path, the stone applies a force on the ball and the speed of the ball reduces and the direction of the ball changes.
What happens to the speed of the object when the applied force is in the opposite direction to the direction of motion?
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Speed increases.
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Speed decreases.
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Speed remains the same.
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None of the above
Explanation
If the force is applied in the direction opposite to the direction of motion, it opposes the motion of the object and hence the speed of the object decreases.
In pressing a rubber ball placed on a table, the application of force leads to:
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a change in the shape of the object.
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a change in the state of the motion of the object.
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a change in the mass of the object.
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no change anywhere.
Explanation
On pressing a rubber ball placed on a table, the ball get compressed and hence, the shape of the ball changes.
The state of motion of the ball doesn't change. It is because when we press the ball, the ball presses the table surface. The table surface applies an equal and opposite force on the ball. Therefore, the net force on the ball is zero so it doesn't change its state of motion.
The mass remains unchanged because we are not removing any portion of the ball. We are not changing the amount of matter contained by the ball. The force applied only brings the particles of the ball closer to compress it.
What will be the effect on the speed of the object when the force applied is in the direction of its motion?
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Speed increases
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Speed decreases
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Speed remains the same
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None of the above
Explanation
If the force applied on the object is in the direction of its motion, it aids the motion of the object and hence, the speed of the object increases.
Unlike poles of two magnets ______ each other.
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attract
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repel
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neutralize
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exert no force on
Explanation
Unlike poles of the two magnets attracts each other. The force applied by it is non-contact forces and is called magnetic force.
Attraction or repulsion between two objects can also be seen as another form of ____
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pull or push
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pull only
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push only
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none of the above.
Explanation
The attraction or repulsion can also be seen as pull or push force between two objects.
Which of the following is an example of contact force?
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Muscular force
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Magnetic force
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Gravitational force
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Frictional force
Explanation
Frictional force and Muscular force requires contact between the object and its surface, thus they are an example of contact force.
While magnetic and gravitational forces do not require contact between the two bodies and so are called non contact forces. These force are exerted even if the two objects are separated by a distance $$r$$.
Fill in the blanks:
Animals make use of _______ to carry out their physical activities and other tasks.
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Contact force
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Non-contact force
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Force of friction
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Muscular force
Explanation
To perform physical activities, animals use their muscles, and force is exerted by the muscles of an animal's body. Hence, it is an example of muscular force.
A force can be applied only when it is in contact with an object. Which of the following is the category of this type of force?
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Magnetic force
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Contact force
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Non-contact force
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Muscular force
Explanation
When a force can be applied only by an object in contact with another, then
this force is called a contact force.
Which of the following is NOT a non-contact force?
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Magnetic force
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Electrostatic force
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Gravitational force
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Muscular force
Explanation
Magnetic force and electrostatic forces are non-contact force as the force applied on an object without any contact with it, similarly, with gravitational force this is force applied without being aware of it and all time.
Muscular force can be applied only while in contact with the object. So, it is a contact force, not a non-contact force.
Fill in the blanks:
The force resulting due to the action of muscles is known as the ______ force.
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contact
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muscular
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friction
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magnetic
Explanation
The force caused by the action of muscles in our body is known as muscular force.
Fill in the blanks:
The application of force on an object may change its ______.
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shape
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direction of motion
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speed
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All of the above
Explanation
The application of force on an object may change the speed, shape and the direction of motion of an object.
Like poles of two magnets _____ each other.
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attract
0%
repel
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exert no force on
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neutralize
Explanation
Like poles of two magnets repel each other, The force between them is non contact force and magnetic force
What type of force is exerted on our body during respiration?
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Magnetic force
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Non-contact force
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Muscular force
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Gravitational force
Explanation
Lungs expand and contract while we inhale and exhale during breathing. Here, the force is exerted by the muscles in our body and hence it is an example of muscular force.
Gravitational force is a _____ force.
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contact
0%
non-contact
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magnetic
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electrostatic
Explanation
Gravitational force is a non-contact force. For action of gravitational force, contact with an object is not required. The force of gravity acts on all object at all the time even while not in contact with the earth.
The force exerted by a charged body on another charged or uncharged body is known as ______ force.
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magnetic
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electrostatic
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gravitational
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friction
Explanation
Electrostatic force is a exerted by a charged body on another changed or uncharged body.
Gravitational force is a/an ______ force.
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Repulsive
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Attractive
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Contact
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Neutral
Explanation
Gravitational force is an attractive force as it tends to move all objects towards itself. It cannot be repulsive in nature.
When an object is rubbed with some materials, it acquires charges and becomes ________ object.
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uncharged
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charged
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neutral
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heavy
Explanation
When an object is rubbed with some material it either loses electrons to other body or gains electrons from other body and hence a net charge is accumulated on the object . Thus the object acquires charge and is called as charged object and develops electrostatic force.
Electrostatic force is also a ________ force.
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Contact
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Muscular
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Non-contact
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Gravitational
Explanation
The force exerted by a charged body on another charged or uncharged body is known as electrostatic force. This force comes into play even when the bodies are not in contact. The electrostatic force is an example of a non-contact force.
Objects fall towards the earth because the earth pulls those. This pull is called _________ force.
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contact
0%
muscular
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gravitational
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electrostatic
Explanation
Objects tend to fall downward towards the earth as the earth pulls the objects due to its gravity. The pull is known as gravitational force.
Gravity is shown by
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earth only
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earth and moon
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earth and some selected planets
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all objects in the universe
Explanation
Gravity is not a property of the earth alone. Every object in the universe exerts a force on every other object. This force is known as the gravitational force.
During winter, clothes tend to stick to our body as an action of ______ force.
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electrostatic
0%
muscular
0%
magnetic
0%
contact
Explanation
Static charges in our clothes and body occur because of built of excess charge. When pieces of fabric rub against each other and with the body, it causes a built of charges, resulting in an electrostatic attraction, and h
ence, during winters, clothes tend to stick to our bodies.
Fill in the blanks:
The force of friction arises due to contact between surfaces. It is an example of _________ force
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Non-contact force
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Muscular force
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Contact force
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Gravitational force
Explanation
Friction is a force that is exerted by a surface on an object that is moving on the surface. So, it is a contact force.
Attraction and repulsion between charged objects are examples of _______ force.
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Non-contact
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Contact
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Either Contact or Non-contact
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Neither Contact nor Non-contact
Explanation
The attraction and repulsion between charged objects happen due to the action of electrostatic forces. Electrostatic force can act between bodies not in contact. So, attraction and repulsion between charged objects are examples of non-contact force.
Which of the following cases represent that a force can change the shape of an object?
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A man trying to stop a sliding car.
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A weight put at the centre of a metal scale placed between two bricks.
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Two girls pulling each other.
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A man pulling a cow with a rope around his neck.
Explanation
A weight put at the center of a metal scale placed between two bricks will bend the scale from the middle.
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