Force And Motion MCQs
A body moves 6 m north, 8 m east, and 10 m vertically upwards. What is the magnitude of the resultant displacement from the initial position?
The area under a velocity-time graph represents:
Acceleration
Displacement
Instantaneous velocity
Jerk
A projectile is thrown with an initial velocity of 10 m/s at an angle of 60° with the horizontal. What is the horizontal component of its velocity at the highest point?
According to Newton's first law of motion, an object will remain at rest or in uniform motion in a straight line unless:
It is very heavy.
An external force acts on it.
It has momentum.
Its energy is conserved.
A force of 10 N acts on a body of mass 2 kg. What is the acceleration produced?
20 m/s²
0.2 m/s²
5 m/s²
8 m/s²
The change in momentum.
The rate of change of momentum.
The product of mass and acceleration.
The product of force and velocity.
In an elastic collision between two bodies:
Only momentum is conserved.
Only kinetic energy is conserved.
Both momentum and kinetic energy are conserved.
Neither momentum nor kinetic energy is conserved.
A bullet of mass 20 g is fired from a gun of mass 10 kg with a velocity of 150 m/s. What is the recoil velocity of the gun?
-0.3 m/s
-3 m/s
0.3 m/s
3 m/s
The work done is zero if the angle between the force and displacement is:
The kinetic energy of a body of mass 'm' moving with velocity 'v' is:
The slope of a displacement-time graph gives:
Acceleration
Velocity
Distance
Force
Which of the following is a vector quantity?
Speed
Distance
Mass
Momentum
A car accelerates from rest to 20 m/s in 10 seconds. The distance it covers in this time is:
Action and reaction forces described by Newton's third law:
Act on the same body.
Are always equal in magnitude and opposite in direction.
Cancel each other out.
Are always perpendicular to each other.
The rate of doing work is called:
Energy
Momentum
Power
Impulse
For a projectile, the angle of projection for maximum horizontal range is:
A body of mass 5 kg is lifted vertically to a height of 2 m. The work done against gravity is (take g = 9.8 m/s²):
Which of the following remains constant for a body in uniform circular motion?
Velocity
Speed
Acceleration
Momentum
The S.I. unit of impulse is:
An object of mass 'm' falls from rest from a height 'h'. Its velocity just before striking the ground is:
The time rate of change of linear momentum of a body is equal to:
Its acceleration
The applied force
Its impulse
Its kinetic energy
If the velocity of a body is doubled, its kinetic energy will be:
Halved
Doubled
Four times the original value
Unchanged
In an inelastic collision:
Both momentum and kinetic energy are conserved.
Momentum is conserved but kinetic energy is not.
Kinetic energy is conserved but momentum is not.
Neither momentum nor kinetic energy is conserved.
A body is moving with constant velocity. The net force on it is:
In the direction of motion
Opposite to the direction of motion
Zero
Perpendicular to the direction of motion
The trajectory of a projectile (in the absence of air resistance) is a:
Straight line
Circle
Parabola
Hyperbola
What is the work done by the centripetal force on a body moving in a circle?
Positive
Negative
Zero
Infinite
A 1 kg object has a potential energy of 1 J relative to the ground. What is its height? (take g = 9.8 m/s²)
The law of conservation of momentum applies to a system of colliding objects only if:
The objects are of equal mass.
The collision is elastic.
There is no net external force on the system.
The objects stick together after collision.
If the momentum of a body is doubled, its kinetic energy becomes:
Double
Half
Four times
Constant
Instantaneous velocity is the limiting value of the average velocity when the time interval approaches:
Infinity
Zero
A constant value
One second
Which of the following effects cannot be produced by an applied force?
Change the speed
Change the direction of motion
Change the mass of the body
Change the shape of the body
A force of 5 N acts on a body for 0.1 s. The change in its momentum is:
50 kg m/s
5 kg m/s
0.5 kg m/s
0.02 kg m/s
A stone is dropped from a tower. It will reach the ground in 4 s. The height of the tower is (take g = 9.8 m/s²):
The range of a projectile is the same for angles of projection:
30° and 45°
30° and 60°
45° and 90°
60° and 90°
The work-energy theorem states that the work done on an object is equal to the change in its:
Potential energy
Kinetic energy
Momentum
Total energy
If a lighter and a heavier body have the same momentum, which one has greater kinetic energy?
The lighter body
The heavier body
Both have the same kinetic energy
It cannot be determined
A ball is thrown vertically upward. At the maximum height:
Its velocity is zero and acceleration is zero.
Its velocity is zero and acceleration is not zero.
Its velocity is not zero and acceleration is zero.
Its velocity is not zero and acceleration is not zero.
Which law of motion gives the measure of force?
First law
Second law
Third law
Law of gravitation
A body starts from rest and moves with uniform acceleration. The ratio of the distance covered in the 1st second to the distance covered in the 2nd second is:
A force can be completely described by its:
Magnitude only
Direction only
Magnitude and direction
Magnitude and point of application
The 'reaction' force does not cancel the 'action' force because:
The action force is greater than the reaction force.
They act on different bodies.
They are in the same direction.
The reaction force exists only after the action force is removed.
An explosion breaks a rock into three pieces. Which of the following is conserved?
Kinetic energy
Momentum
Velocity
Mass
At what angle must two forces of equal magnitude act so that the resultant is equal to either of them?
A lift is moving up with an acceleration 'a'. The apparent weight of a person of mass 'm' will be:
When a body moves from the equator to the poles, its weight:
Increases
Decreases
Remains the same
Becomes zero
The time of flight of a projectile is given by:
(v_i sinθ)/g
(2v_i sinθ)/g
(v_i cosθ)/g
(v_i² sin²θ)/(2g)
Work done by a variable force is determined by:
Multiplying force by distance
The area under the force-displacement graph
The slope of the force-displacement graph
The product of force and time
A conservative force is one where the work done:
Depends on the path taken.
Is always zero.
Is independent of the path taken.
Is always positive.
The escape velocity from the Earth's surface is approximately:
9.8 m/s
11.2 km/s
7.9 km/s
3.0 x 10^8 m/s
If the displacement of a particle is zero, the distance covered:
Must be zero
Is not zero
May or may not be zero
Is negative
A body is moving with a velocity of 10 m/s. If the motion is uniform, what will be the velocity after 10 s?
A man in a car is moving with a velocity of 36 km/hr. His speed with respect to the car is:
10 m/s
36 km/hr
Zero
Infinite
The slope of a velocity-time graph for retardation is:
Positive
Negative
Zero
Curved
The distance covered by a freely falling body in 2 seconds is (take g = 9.8 m/s²):
Which of Newton's laws of motion is also called the law of inertia?
First Law
Second Law
Third Law
Law of Universal Gravitation
A force of 100 N acts on a body of mass 2 kg for 10 s. The change in momentum is:
1000 kg m/s
500 kg m/s
200 kg m/s
50 kg m/s
In a perfectly inelastic collision, the coefficient of restitution 'e' is:
The maximum height of a projectile is given by:
(v_i² sin²θ)/(2g)
(v_i² sin(2θ))/g
(2v_i sinθ)/g
(v_i sinθ)/g
A person is holding a bucket of water and walking on a level road with a uniform velocity. The work done by the person on the bucket is:
Positive
Negative
Zero
Dependent on the mass of the bucket
Power can be defined as the dot product of:
Force and displacement
Force and time
Force and velocity
Force and acceleration
Which of the following is a non-conservative force?
Gravitational force
Elastic spring force
Frictional force
Electrostatic force
Two bodies of masses m1 and m2 have equal kinetic energies. The ratio of their linear momenta is:
m1 : m2
m2 : m1
√m1 : √m2
1 : 1
The horizontal range of a projectile is maximum when the angle of projection is 45°. The maximum height at this angle is:
Equal to the range
Half of the range
One-fourth of the range
Twice the range
A bomb of mass 9 kg explodes into two pieces of masses 3 kg and 6 kg. The velocity of the 3 kg mass is 16 m/s. The kinetic energy of the 6 kg mass is:
A passenger in a moving bus is thrown forward when the bus suddenly stops. This is explained by:
Newton's First Law
Newton's Second Law
Newton's Third Law
The principle of conservation of energy
The unit of weight in the S.I. system is:
Kilogram (kg)
Gram (g)
Newton (N)
Dyne
Two forces of 3 N and 4 N are acting on a body. Which of the following cannot be the resultant force?
A cricketer catches a ball of mass 150 g moving at 20 m/s. If the catching process takes 0.1 s, the average force exerted is:
A car travels the first half of a distance at 30 km/hr and the second half at 50 km/hr. The average speed is:
40 km/hr
37.5 km/hr
42 km/hr
20 km/hr
A body under the action of several forces will have zero acceleration if:
The body is very heavy.
The forces are all in the same direction.
The vector sum of all the forces is zero.
The forces are conservative.
If an object is moving at a constant velocity, which statement must be true?
A constant force is acting on it in the direction of motion.
The net force on the object is zero.
There are no forces acting on the object.
The object is accelerating.
A 10 N force is required to keep an object moving at a constant velocity of 2 m/s. The work done in 5 seconds is:
Which of the following pairs of physical quantities have the same dimensions?
Force and Power
Momentum and Impulse
Work and Power
Energy and Momentum
A ball is dropped from a satellite revolving around the Earth at a height of 120 km. The ball will:
Fall to the Earth
Move away from the Earth
Continue to move with the same speed along the original orbit of the satellite
Move in a straight line tangentially to the satellite's orbit
What is the angle between the velocity and acceleration vectors of a body in uniform circular motion?
A body of mass 2 kg is thrown up vertically with a kinetic energy of 490 J. The height at which the KE becomes half its original value is:
Two projectiles are fired from the same point with the same speed at angles of 60° and 30°. Which will be the same for both?
Maximum height
Time of flight
Horizontal range
Initial vertical velocity
An elevator is moving downwards with an acceleration 'a'. The apparent weight of a person of mass 'm' inside is:
When a 1 N force acts on a 1 kg mass that is free to move, the object moves with:
A speed of 1 m/s
An acceleration of 1 m/s²
A speed of 1 km/s
An acceleration of 9.8 m/s²
A gun fires a bullet of mass 50 g with a velocity of 30 m/s. The gun is pushed back with a velocity of 1 m/s. The mass of the gun is:
The kinetic energy of a body is increased by 300%. The linear momentum of the body will increase by:
A body is projected horizontally from the top of a tower. The shape of the path traced by it is:
Straight line
Circular
Parabolic
Elliptical
An isolated system is one in which which of the following is conserved?
Velocity
Acceleration
Momentum
Force
A rocket works on the principle of:
Conservation of Energy
Conservation of Mass
Conservation of Momentum
Conservation of Charge
If the kinetic energy of a particle is doubled, then its momentum will be:
√2 times the initial momentum
2 times the initial momentum
4 times the initial momentum
Unchanged
When a body moves with a constant speed along a circle:
No work is done on it.
No force acts on it.
Its acceleration is zero.
Its velocity is constant.
A ball of mass 0.5 kg moving at 10 m/s collides with a wall and rebounds with the same speed. If the contact time is 0.01 s, what is the force on the wall?
A stone is tied to a string and whirled in a circle. If the string breaks, the stone flies:
Radially inwards
Radially outwards
Tangentially to the circular path
Straight down
A person in an open car moving at constant velocity throws a ball vertically up. The ball falls:
Outside the car
In the car, ahead of the person
In the car, behind the person
Exactly in the hand which threw it up
A machine gun fires n bullets per second, each of mass m, with velocity v. The force exerted on the gun is:
A force of (2i + 3j) N acts on a body and displaces it by (4i - 2j) m. The work done is:
The second equation of motion is:
v_f = v_i + at
s = v_i*t + ½at²
v_f² = v_i² + 2as
F = ma
Other Physics Topics MCQs
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