CBSE Questions for Class 9 Physics Force And Laws Of Motion Quiz 7 - MCQExams.com

Name the property of matter due to which a body continues to be in its state of rest or uniform motion unless an external force acts on it :
  • Inertia
  • Elasticity
  • Viscosity
  • Density
The resultant of balanced forces is :
  • equal to infinity
  • Equal to zero
  • Not equal to zero
  • Equal to the acceleration produced in the body
Motion of a football after kicking is an example of:
  • balanced force
  • unbalanced force
  • both A and B
  • neither A nor B
Force is _______. Fill in the blank.
  • a push
  • a pull
  • both A and B
  • none of these
The acceleration in a body is due to:
  • Balanced force
  • Unbalanced force
  • Mass
  • Temperature
A force when applied on a non rigid object
  • it does not change the inter spacing between its constituent particles
  • it does not cause any change in its dimension
  • it does not produce motion in it
  • None
Suppose a man is standing behind a stationary car. Which of the following options will be correct?
  • The car will start moving towards the man
  • The car will start moving away from the man
  • The car will not move at all
  • None of these
Mark the correct option.
  • Mere presence of two objects brings force into action
  • Interaction between two objects is necessary for bringing force into action
  • Force is only a pulling force
  • None
Fill in the blank.
When a force is applied on a soft object,it changes the_________ of the object. 
  • Shape
  • Size
  • Direction of force
  • Both a and b
When two equal forces act on an object in opposite directions, they are known as:
  • Equivalent Forces
  • Unbalanced Forces
  • Balanced Forces
  • Parallel Forces
 Fill in the blank.
Interaction of one object with ________ results in a force.
  • Itself
  • Another object
  • Both
  • May itself and may be another object 
A cricket ball hits and breaks a glass window and ends up inside the house. Identify which of the following statement is correct about the ball?
  • The force the ball exerted on the window was larger than the force the window exerted on the ball
  • The force the ball exerted on the window was smaller than the force the window exerted on the ball
  • The force the ball exerted on the window was the same as the force the window exerted on the ball
  • Since the ball broke the window, it didn't lose any momentum
  • The kinetic energy the ball had before it broke the window equaled the kinetic energy the ball had after it broke the window
How does mitts help baseball players in catching the ball?
  • The impulse delivered to the catchers hand is reduced due to the presence of the mitt
  • The force on the catchers hand is reduced because of the increased area provided by the mitt
  • The baseballs change in momentum is reduced due to the presence of the mitt
  • The force on the catchers hand is reduced because the mitt increases the time of impact
  • The force on the catchers hand is reduced because the mitt decreases the time of impact
The force needed for something to change movement or change direction is known as:
  • Balanced Force
  • Equivalent Force
  • Unbalanced Force
  • Natural Force
A goldfish swims through an aquarium by moving its fins and tail. What causes the fish to move forward?
I. The force exerted by the water on the goldfish
II. The force exerted by the tail of the goldfish on the water
III. The force exerted by the fins of the goldfish  on the water
  • I only
  • II only
  • I and III only
  • II and III only
  • I, II, and III
Which of the following is NOT an example of balanced force?
  • Gravitaional force due to which table is steady on ground
  • Two persons pushing box with same force in opposite direction
  • See saw moving up and down
  • None of the above
Inertia depends on which two factors:
  • Height and Weight
  • Length and Width
  • Density and Mass
  • Speed and Velocity
The strength of force is expressed by?
  • Direction
  • Magnitude
  • Both
  • None
When it is known that a net force is operating on an object, it is known that the object is:
  • moving with constant velocity
  • losing mass
  • at rest
  • being accelerated
  • Gaining weight
An arm wrestling competition among a strong person and a weak one is an example of?
  • Balanced Forces
  • Unbalanced Forces
  • Net Force
  • Frictional Force
Which of the following type of forces is responsible for keeping a cart at rest or maintaining it  moving at constant velocity?
  • balanced forces
  • gravity
  • external forces
  • friction
  • unbalanced forces
A girl holds an orange at rest in her hand. One force in an action/reaction pair is the force of earth's gravity pulling down on the orange.
What is the other force in the action/reaction pair of forces?
  • The force of the hand pushing up on the orange
  • The force of the earth pushing up on the girl's feet
  • The force of the orange pushing down on the girl's hand
  • The force of the orange pulling up on the earth
Which of the following best describe about the statement " An object slides on a horizontal, frictionless surface".
  • Inertia
  • Unbalanced forces
  • Action and reaction force pairs
  • Universal gravitation
  • Simple harmonic motion
A book rests on a table, exerting a downward force on the table. The reaction to this force is
  • the force of Earth on the book
  • the normal force acting on the book because of the table
  • the force of Earth on the table
  • the inertia of the book
A ball falls freely towards the Earth. If the action force is the Earth pulling down on the ball, then identify which of the following best describe the reaction force:
  • the ball pulling up on the Earth
  • air resistance acting on the ball.
  • the ball striking the Earth when it lands.
  • the inertia of the ball
  • there is no reaction force in this case.
Which one of the following is equal to $$1$$ Newton?
  • $$1\ kg\cdot m^{2}/s$$
  • $$1\ kg\cdot m/s^{2}$$
  • $$1\ kg^{2} / s$$
  • $$1\ kg^{2}\cdot m/s$$
A force of a given magnitude acts on a body. On what factors does the acceleration of the body depend?
  • Density of the body
  • Volume of the body
  • Mass of the body
  • Shape of the body
What would happen to a car traveling west at a constant velocity of 55 MPH without any influence of external force?
  • The car would continue moving west with a velocity of 55 MPH
  • The car would slowly increase its velocity approaching but not reaching the speed of light
  • The car would slow down but never reach 0 velocity
  • The car would slow down and come to rest
  • The car would increase its velocity without changing acceleration
A physics book rests on a table top. A gravitational force pulls down on the book. According to Newton's third law. The force that is equal to this gravitational force is:
  • the force the table exerts upward on the book.
  • the force the book exerts downward on the table.
  • the force the table exerts downward on the table.
  • the force the book exerts upward on the table.
  • the force the air pressure exerts down on the book.
Consider a porter standing on a platform with a suitcase which presses his head with a force of 200 N. If this force is taken to be the action, from where is the reaction force exerted and to where is it directed ?
  • The head, on the suitcase
  • The earth, on the suitcase
  • The earth, on the porter
  • The suitcase, on the earth
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