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CBSE Questions for Class 8 Physics Force And Pressure Quiz 5 - MCQExams.com
CBSE
Class 8 Physics
Force And Pressure
Quiz 5
Mechanical force exerted by living animals is
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muscular force
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magnetic force
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electrostatic force
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none of these
Explanation
Mechanical force exerted by muscles of living animals is muscular force.
What type of force is applied in kicking a football?
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Magnetic force
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Muscular force
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Electrical force
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Nuclear force
Explanation
A football is kicked with the help of foot muscles. So, the force applied is mechanical force.
Mark the correct option
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Force can be seen
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When an inflated balloon is pressed between the two hands,only its shape changes
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Force is a push,pull or squeeze
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All
Explanation
Force cannot be seen.we can 'see' or 'feel' the force through its effects.when an inflated balloon is pressed between the two hands,its shape and size changes.
Force acting on a body is a push,pull or a squeeze.
Muscular force is a type of
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mechanical force
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magnetic force
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electrostatic force
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gravitational force
Explanation
Muscular force is a type of mechanical force as it is produced by mechanical contraction of muscles.
Muscular force can:
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Change the state of motion of an object
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Change the shape of an object
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Both $$A$$ and $$B$$
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None of these
What type of force is applied to pick up a load from ground by hand?
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Muscular force
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Magnetic force
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Electrostatic force
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Gravitational force
Explanation
We pick up loads from the ground with our hands with the help of our muscles. So, the type of force applied is muscular force.
Force is _______.
Fill in the blank.
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a push
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a pull
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both A and B
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none of these
Explanation
Force is a push or pull which changes or tends to change the state of rest or of uniform motion.
Mark the incorrect option:
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A force always make an object to move
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A force has both magnitude and direction
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A force can be represented by an arrow
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Force is a vector quantity
Explanation
We are to remember that force does not always make an object to move. For example,we may push a large piece of rock without displacing it from its position.We may even push a wall without any success. And, on the other had, we may apply force on a dough by our fingers to change its shape and size. So, a force does not always make an object to move, it may be used to change the shape and size of an object as well.
Force is a vector quantity because it has both magnitude and direction.
It can be represented by an arrow.
Fill in the blank.
When a force is applied on a soft object,it changes the_________ of the object.
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Shape
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Size
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Direction of force
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Both a and b
Explanation
A soft object is a non-rigid object. Force can change the shape and size of a soft object.
A force when applied on a non rigid object
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it does not change the inter spacing between its constituent particles
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it does not cause any change in its dimension
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it does not produce motion in it
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None
Explanation
A force when applied to a non-rigid object, the object can not hold its original shape. Therefore, the inter-spacing between the constituent particles changes. At the same time, the force causes a change in the state of motion of the object. So, none of the given options is correct.
As longer the interaction between two objects exist:
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The force remains
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The force stops after the initial interaction
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Both a and b
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The force remains for a specific time interval
Explanation
A force is a push or pull on an object. This push or pull comes from the objects interacting with one another and only from such interactions. Once the interaction stops, there is no longer any force.
When a force is applied on a rigid object
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It changes the inter spacing between its constituent particles.
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It changes the dimension of the object
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It only causes motion in it
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All
Explanation
A force, when applied to a rigid object, does not change the interspacing between its constituent particles and therefore it does not change the dimension of the object. It only causes motion in it.
Fill in the blank.
At least ___________ objects must interact for a force to come into play.
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1
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2
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3
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4
Explanation
$$Answer:-$$ B
Pushing, hitting and pulling of
objects
are all ways of
bringing objects
in motion.
This friction
force
arises
between two
surfaces in contact. No motion of the wood (in fig) will take place if it is at rest and equal forces in both direction are applied, but no net
force
is
needed
to sustain the uniform motion of the marble.
By newtons third law:
For every action, there is an equal and opposite reaction. So two forces come into picturure for action.
Which of the following is/are contact forces
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Normal force
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Tension force
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Friction force
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All
Explanation
Contact forces are those types of forces which result when the two interacting objects are perceived to be physically contacting each other. Examples of contact forces include frictional forces, tensional forces, normal forces, air resistance forces, and applied forces.
Pulling of a cart/tram is an example of
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Resultant force
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Gravitational force
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Contact force
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Action at a distance force
Explanation
Contact force is a force that is applied by objects in contact with each other. Since, pulling of cart requires a force applied in contact with the cart. Hence, this is an example of Contact force.
Suppose a man is standing behind a stationary car. Which of the following options will be correct?
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The car will start moving towards the man
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The car will start moving away from the man
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The car will not move at all
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None of these
Explanation
The interaction of
one object with another object results in a
force between the two objects. If
a man is standing behind a stationary car,
there is no interaction between the man and the car, So no force act on the car, and hence the car does not move.
Mark the correct option.
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Mere presence of two objects brings force into action
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Interaction between two objects is necessary for bringing force into action
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Force is only a pulling force
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None
Explanation
$$Answer:-$$ B
Pushing, hitting and pulling of
objects
are all ways of
bringing objects
in motion.
This friction
force
arises
between two
surfaces in contact. No motion of the wood (in fig) will take place if it is at rest and equal forces in both direction are aplied, but no net
force
is
needed
to sustain the uniform motion of the marble.
By newtons third law:
For every action, there is an equal and opposite reaction. So two forces come into picturure for action.
Fill in the blank.
Interaction of one object with ________ results in a force.
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Itself
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Another object
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Both
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May itself and may be another object
Explanation
$$Answer:-$$ B
The best example we can take into account is the gravitational force.
Gravitation or gravity is a natural phenomenon
by which all things with mass
are brought toward
one another, including planets, stars,
and galaxies
.
$$2 \ N$$ force is applied on a body from the right side and $$6 \ N$$ is applied from the left side .The resultant force will be __________ $$N$$
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$$8$$
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$$4$$
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$$3$$
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None
Explanation
If two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces. The direction of the net force is in the direction of the larger force.
Force 1 $$F_1=-2 \ N$$ (towards left)
Force 1 $$F_2=+6 \ N$$ (towards right)
Resultant force $$F_1+F_2=-2N + 6 N =+4 N$$ (towards right)
Reindeers are made to pull the sleds in artic regions. The force involved in this activity is
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Frictional force
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Gravitational force
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Magnetic force
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Muscular force
Explanation
In article regions,reindeers are made to pull the sleds that are used as passenger vehicles. In these cases, the muscles of animals apply force. This force is called muscular force.
Lungs expand and contract while we inhale and exhale air during breathing.The force involved in this activity is called
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Breathing force
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Muscular force
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Kinetic force
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Pulmonary force
Explanation
Force resulting due to action of muscles is known as muscular force.And in breathing internaland external intercoastal muscles are involved.
In bullocks, horses, camels pulling carts the effort(force)is caused by
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The woody carts
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The muscles of animals
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Muscles of humans
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The frictional force between the roads and wheels of the carts
Explanation
In our daily life, we push, pull, or lift many things. The force is caused by the action of muscles in our body. We also see animals like bullocks, horses, and camels pulling carts. In these cases, the muscles of animals apply force. This force is called muscular force.
What is net Force?
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Sum of all forces acting on a body
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Multiplication of all forces acting on a body
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Sum of all balanced forces acting on a body
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Sum of all unbalanced forces acting on a body
Explanation
Sum of all forces whether balanced or unbalanced acting on a body is the net force acting on the body.
The strength of force is expressed by?
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Direction
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Magnitude
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Both
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None
Explanation
Force could be larger or smaller than the other.the strength of a force is usually expressed by its magnitude.
Contact forces
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Are action at a distance forces
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Ex-gravitational forces
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Act when the bodies are in physical contact with other.
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All
Explanation
A contact force is any force that requires contact to occur. Contact forces are ubiquitous and are responsible for the most visible interactions between macroscopic collections of matter. Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.
Force that enables us to perform all activities like movement or bending of the body is
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Gravitational force
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Frictional force
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Muscular force
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Magnetic force
Explanation
It is the muscular force that enables us to perform all activities involving movement or bending of our body. It is the force resulting due to the action of muscles. Our muscles generate this force by the contraction and relaxation.
Which of the following is not an example of contact force
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Muscular force
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Gravitational force
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Frictional force
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None
Explanation
Contact forces are the forces which result when two interacting bodies are in direct contact with each other.some of the examples are muscular forces,frictional forces,air resistance forces and so on.
A $$5N$$ force is applied from one direction on a body and at the same time, same force is applied to it from the other side. So, what will be the result
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Body will move towards left
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Body will move towards right
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Body will not move at all
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Body will start rolling at its place
Choose the incorrect statement(s).
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Length of a rubber band increases,when a stretching force is applied
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A spring shortens in length on the application of a compressive force
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Gold on hammering flattens to form a thin leaf
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None of these
Explanation
Force is an external agent (push or pull) which can change the state of motion or the state of the rest of an object.
Force can also bring change in dimensions and all the above options are its examples.
Fill in the blank.
A rubber balloon _________ when the molecules of air exert force on its walls.
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Expands
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Contracts
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No change in dimension is seen
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All of the above
Explanation
Force can bring change in dimension.A rubber balloon expands when the molecules of air exert force on its walls.
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