CBSE Questions for Class 9 Physics Force And Laws Of Motion Quiz 4 - MCQExams.com

Acceleration is always in the direction:
  • of the displacement
  • of the initial velocity
  • of the final velocity
  • of the net force
The term mass refers to the same physical concept as:
  • weight
  • inertia
  • force
  • acceleration
1 newton is the amount of force that produces an acceleration of 1 $$ms^{-2}$$ in an object of mass:
  • 1 g
  • 1000 g
  • 10 g
  • 100 g
State whether given statement is True or False.
A five rupees coin has more inertia than a one-rupee coin.
  • True
  • False
Which of the following has more inertia. A rubber ball or a stone of the same size?
  • rubber ball
  • stone
  • both have same intertia
  • cannot be determined
State whether given statement is True or False.
When a net external force acts on an object of mass $$m$$, the acceleration that results is directly proportional to the net force and has a magnitude that is inversely proportional to the mass.
  • True
  • False
State whether given statement is True or False.
Force never exists in pairs.
  • True
  • False
A car accelerates along a road. Identify the force that moves the car.
  • Friction force between wheel and ground
  • Thrust exerted by the exhaust
  • Rolling force on the ground
  • None of these
Inertia of a body depends on:
  • Mass of the body
  • Velocity of the body
  • Acceleration of the body
  • Energy of the body
The mass of an object is a $$\underline{                     }$$ measure of inertia:
  • quantitative
  • qualitative
  • absolute
  • average
State whether given statement is True or False.
If the net force acting on an object is in the positive x-direction, the object moves only in the positive x-direction.
  • True
  • False
Consider a ball at rest in the middle of a toy wagon. When the wagon is pulled forward, the ball:
  • Rolls forward
  • Stays stationary
  • Rolls sidewards
  • Rolls backwards
Which of the following action describes pushing by a body?
  • Kicking
  • Lifting
  • Picking
  • Opening
The incorrect statement about newton's second law of motion is that:
  • it provides a measure of inertia
  • it provides a measure of force
  • it relates force and acceleration
  • it relates momentum and force
Force exerted is :
  • Effort
  • Load
  • Fulcrum
  • None of these
State whether true or false:
The SI unit of force is newton.
  • True
  • False
Which of the following is NOT attributable to application of force?
  • rowing of a boat
  • bursting of a balloon while blowing
  • pedaling a cycle
  • catching a moving cricket ball
A book remains at rest on a table. It is so because of:
  • no force acts on it
  • friction between the book and the surface of table
  • force exerted by book on the table, is same as the force exerted by the table on the book
  • all of the above
State whether given statement is True or False.
You fall in the forward direction when a moving bus applies brakes to stop, and fall backward when it accelerates from rest.
  • True
  • False
A force acts on an object which is free to move. If we know the magnitude of the force on the object and the mass of the object, Newton's 2nd law of motion enables us to determine the object's :
  • weight
  • speed
  • acceleration
  • position
The engine of a car produces acceleration $$4\ ms^{-2}$$ in the car. If this car pulls another car of the same mass. What will be the acceleration produced?
  • $$1\ ms^{-2}$$
  • $$1.5\ ms^{-2}$$
  • $$2\ ms^{-2}$$
  • $$4\ ms^{-2}$$
A force is a result of:
  • interaction between two bodies
  • interaction of one body with itself
  • friction
  • all of the above
Four forces are acting on a body. If the body doesn't change its position or shape, the forces:
  • must be of equal magnitude
  • must be parallel & opposite
  • must add up to zero when taken as vectors
  • must be in a single line
A force cannot be seen but the effect of force can be felt.
  • True
  • False
  • Ambiguous
  • Data insufficient
If a ball is thrown upwards from the surface of earth:
  • The earth remains stationary while the ball moves upwards
  • The ball remains stationary while the earth moves downwards
  • The ball and earth both move towards each other
  • The ball and earth both move away from each other
An object will continue accelerating until:
  • Resultant force on it begins to decrease
  • Its velocity changes direction
  • The resultant force on it is zero
  • The resultant force is at right angles to its direction of motion
When a horse pulls the tonga, the tonga moves forward due to:
  • Force exerted by horse in forward direction
  • Reaction of the tonga
  • Reaction of the  ground on the horse
  • None of these
You are on a frictionless horizontal plane. You can get off the plane :
  • by jumping
  • by throwing some pieces of stone
  • by rolling your body on the surface
  • by running on the plane
State whether given statement is True or False.
Are forces acting on block action-reaction pair.
  • True
  • False
A cannon after firing recoils due to:
  • conservation of energy
  • backward thrust of gases produced
  • Newton's third law of motion
  • Newton's first law of motion
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