CBSE Questions for Class 8 Physics Force And Pressure Quiz 6 - MCQExams.com

When two forces,applied on an object, equal and opposite,then the forces
  • May move the object
  • May stop the object
  • May move the object and also cause a change in its shape
  • Do not move the object but may cause a change in its shape.
If two forces act in opposite directions on an object,the net force acting on it is the
  • Addition of two forces
  • Difference of two forces
  • Division of two forces
  • Multiplication of two forces
Change of shape and size due to force can be seen by applying force on:
  • a spring
  • a sponge
  • an inflated balloon by pressing between the two hands
  • all of these
Length of a rubber band ________ when a stretching force is applied.
  • Increases
  • Decreases
  • Remains same
  • None
If force is applied on the body in the direction of motion then
  • Speed of the body will increase
  • Speed of the body will decrease
  • Speed of the body will not change at all
  • All the options are possible
In the game of cricket, the stumps fall when the ball strikes them. This is an example of
  • Contact force
  • Non contact force
  • Displacement force
  • None
Identify the type of force in diagram
566720.jpg
  • Push
  • Pull
  • No force is acting
  • Both A and B
Force can also be defined as
  • Mass per unit volume
  • Distance covered in unit time
  • External cause which can change the state of motion
  • None
Force is an external effect in the form of a push or pull, which ..................
  • Produces or tries to produce motion in a body at rest
  • Stops or tries to stop a moving body
  • Changes or tries to change the direction of motion of the body
  • None of these
When you and your friend pushed heavy table in the same direction, it becomes easier to move. This is because:
  • The net force is the sum of forces.
  • The net force is the difference of force.
  • The net force is division of forces.
  • The net force is multiplication of forces. 

The $$SI$$ units of Force are _____ or _____.
  • $$kg \ m/s,\ N$$
  • $$kg\ m/s^2, \ Ne$$
  • $$kg\ km/hr$$, Newton
  • $$kg\ m/s^2, \ N$$
Write true or false for each statement:
A force can change the direction of motion of a moving body.
  • True
  • False
Which of the following is not an effect of force?
  • Change in the direction of an object
  • Change in the shape and size of an object
  • Change in the mass of an object
  • Change in the position of a stationary object
What kind of force is used by an archer to pull a bow?
  • Frictional force
  • Muscular force
  • Gravitational force
  • Magnetic force
Which one of the following forces is a contact force?
  • Force of gravity
  • Force of friction
  • Magnetic force
  • Electrostatic force
A brick is kept in three different ways on a table as shown in Figure. The pressure exerted by the brick on the table will be

82081_8155142579e64cf7accd2140876b4f1c.png
  • maximum in position A
  • maximum in position B
  • maximum in position C
  • equal in all cases.
Which is much easier to burst an inflated balloon. When the same force is applied
  • Needle
  • Finger
  • Both are the same
  • Can't say
During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is
  • force of gravity.
  • electrostatic force.
  • force of friction.
  • magnetic force.
Given figure shows a man with a parachute. Name the force which is responsible for his downward motion. Will he come down with the same speed without the parachute?

82110.JPG
  • Force of gravity, No
  • Air resistance, No
  • Air resistance, Yes
  • Force of gravity, Yes
While sieving grains, small pieces fall down. Which force pulls them down?
  • Coulomb force
  • Gravitational force
  • Nuclear force
  • Electrostatic force
A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. The pressure exerted by the box will be:
  • maximum when length and breadth form the base
  • maximum when breadth and width form the base
  • maximum when width and length form the base
  • the same in all the above three cases
A knife with sharp edge is more effective than a blunt knife because:
  • the pressure increases due to decrease in surface area of contact.
  • the force increases due to decrease in surface area of contact.
  • it's velocity ratio decreases.
  • it gets blunt due to long use.
What is the impact of balanced forces on an initially stationary object?
  • The object remains at rest
  • The object moves with uniform speed
  • The object moves in the direction of frictional force acting on it
  • The object moves in a direction perpendicular to the surface of contact
The state of rest or state of motion of a body can be changed by using
  • Pressure
  • Force
  • Heat
  • None of these
Two astronauts A and B off mass $$m_a$$ and $$m_b$$ are in space. A pushes B with some force. ($$m_a =m_b$$)
  • acceleration of A is greater than that of B
  • acceleration of A is less than that of B
  • neither is accelerated
  • their accelerations are equal in magnitude but opposite in direction
Which of the following is/are true about force
  • Force will always change the magnitude of velocity
  • Force will always change the direction of velocity
  • S.I unit of force is Newton
  • All the above.
Which force is used by an archer to pull a bow?
  • Muscular force
  • Frictional force
  • Gravitational force
  • Elastic spring force
Which of the following requires a pushing force?
  • Throwing a stone at a bird.
  • Grabbing hold of a pencil.
  • Leaves falling from a tree.
  • A load lifted by a pulley.
Which of the following units is used to measure thrust?
  • Dyne
  • Pascal
  • Newton per meter square
  • Dyne per centimeter
Animals like camels walk easily in deserts as broad feet exert less pressure on sandy ground.
  • True
  • False
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