Class 9 Force – MCQs

Class 9 Force – MCQs

A force is anything that can:
a) Only change the speed of an object
b) Only change the direction of an object
c) Cause a change to objects
d) Never affect objects
Which of the following is an effect of force?
a) Changing the shape of an object
b) Moving or stopping an object
c) Changing the direction of a moving object
d) All of the above
A contact force must:
a) Never touch the object
b) Always act from a distance
c) Be in contact with the object
d) None of these
Which of the following is not an example of contact force?
a) Force used to push a door
b) A sculptor turning clay into a pot
c) The wind turning a windmill
d) Earth pulling the Moon
A non-contact force can act:
a) Only when objects are touching
b) Without touching an object
c) Only on solid objects
d) None of these
Which of the following is a non-contact force?
a) Pushing a box
b) Pulling a chair
c) Gravitational pull of Earth
d) Turning clay into pot
The unit of force is:
a) Joule (J)
b) Newton (N)
c) Watt (W)
d) Pascal (Pa)
The unit of force is named after:
a) Galileo Galilei
b) Albert Einstein
c) Sir Isaac Newton
d) Archimedes

By applying brakes, a moving cycle can be:
a) Made to increase speed
b) Brought to rest
c) Change its shape
d) None of these
Changing the direction of a moving bicycle is possible by:
a) Moving its handle
b) Applying brakes
c) Increasing its speed
d) Kicking its wheel
Which of the following is an effect of force?
a) Increase or decrease speed of a body
b) Stop a moving body
c) Change the shape of an object
d) All of the above

If the resultant of applied forces is zero, forces are called:
a) Unbalanced forces
b) Balanced forces
c) Gravitational forces
d) Contact forces
In a tug of war, if both teams pull equally, the rope does not move due to:
a) Unbalanced force
b) Balanced force
c) Gravity
d) Friction
Balanced forces can:
a) Change the state of rest of a body
b) Never change size or shape of a body
c) Change the size and shape of a body
d) Accelerate a moving body
If the resultant of applied forces is greater than zero, forces are:
a) Balanced
b) Unbalanced
c) Constant
d) None of these
Which of the following is caused by unbalanced forces?
a) Moving a stationary object
b) Increasing or decreasing speed of a moving body
c) Stopping a moving object
d) All of these

The property of a body to resist a change in its state is called:
a) Force
b) Inertia
c) Friction
d) Acceleration
Inertia of an object depends on:
a) Volume
b) Mass
c) Shape
d) Speed
Which object has more inertia?
a) A rubber ball and a stone of same size – ?
b) A bicycle and a train – ?
c) A one-rupee coin and a five-rupee coin – ?
Why is it more difficult to push a heavy box than a light one?
a) Heavy box has less friction
b) Heavy box has more inertia
c) Heavy box has less inertia
d) Both have same inertia

Newton’s First Law of Motion is also known as:
a) Law of Gravity
b) Law of Acceleration
c) Law of Inertia
d) Law of Friction
An object remains in rest or uniform motion until:
a) It loses its mass
b) An external force is applied
c) Time passes
d) None of these
A person standing in a bus falls backward when the bus starts suddenly because:
a) Person is careless
b) His body tends to remain in rest
c) His body tends to remain in motion
d) Force of gravity pulls him backward
A person standing in a moving bus falls forward when brakes are applied suddenly because:
a) His body tends to remain in motion
b) His body tends to remain in rest
c) The driver pushed him
d) None of these