Multiple Choice Questions
FORCE AND LAWS OF MOTION
Practice Questions with Answers
Total 120 questions available
Q. 1
An object of mass 20 kg is moving with a velocity of 10 m/s. Its momentum will be:
A
200 kg·m/sB
2000 kg·m/sC
20 kg·m/sD
2 kg·m/sClick an option to check your answer
Q. 2
What does the term "inertia" refer to?
A
The mass of an objectB
The speed of an objectC
The force acting on an objectD
The resistance to change in motionClick an option to check your answer
Q. 3
Which one is correct if a bullet is fired from a rifle?
A
There is no motion of bullet and rifle.B
Rifle moves in the backward direction and bullet moves in the forward direction.C
Bullet and rifle both move in backward direction.D
Bullet moves in backward direction and rifle moves in forward direction.Click an option to check your answer
Q. 4
Which among the following is true as per Newton’s third law:
A
Action and reaction forces are always unequal.B
Action and reaction forces are always equal and opposite.C
Action and reaction forces are always perpendicular.D
Action and reaction forces act in the same direction.Click an option to check your answer
Q. 5
What prevents a box from moving when children push it with a small force on a rough surface?
A
Balanced forcesB
Friction forceC
GravityD
InertiaClick an option to check your answer
Q. 6
Which one of the following statements is not correct for an object moving along a straight path in an accelerated motion?
A
A force is always acting on it.B
It always goes away from earth.C
Its velocity always changes.D
Its speed keeps changing.Click an option to check your answer
Q. 7
What occurs when unbalanced forces act on an object?
A
It spinsB
It maintains its speedC
It stops movingD
It changes speed or directionClick an option to check your answer
Q. 8
Force is defined as:
A
The quantity that opposes inertia.B
Change in momentum.C
Rate of change of momentum.D
The quantity that keeps the velocity constant.Click an option to check your answer
Q. 9
If the force acting on the body is zero, its momentum is:
A
ZeroB
ConstantC
InfiniteD
None of the aboveClick an option to check your answer
Q. 10
The magnitude of a physical quantity is 8.5 Ns. The physical quantity is:
A
Moment of forceB
MomentumC
PressureD
ForceClick an option to check your answer
Q. 11
The v-t graph of a body of 5 kg moving with the help of a force is shown. Then the force involved is_______.
A
20 NB
12.5 NC
2.0 ND
125 NClick an option to check your answer
Q. 12
What is the SI unit of momentum?
A
NewtonB
Kilogram-metre per secondC
KilogramD
JouleClick an option to check your answer
Q. 13
What force opposes the motion of the marble in practical situations?
A
FrictionB
TensionC
GravityD
InertiaClick an option to check your answer
Q. 14
Action and reaction forces are always:
A
Equal and in same direction.B
Unequal and in same direction.C
Equal and in opposite direction.D
Unequal and in opposite direction.Click an option to check your answer
Q. 15
Force remaining constant, if the mass of body increases, its acceleration is likely to:
A
Sometimes increases and sometimes decreasesB
IncreaseC
DecreaseD
Remain sameClick an option to check your answer
Q. 16
What happens to the marble if the right-side plane's angle is decreased?
A
It climbs higherB
It travels further until it stopsC
It rolls back to its original heightD
It falls off the planeClick an option to check your answer
Q. 17
Quantitative expression of force is given by:
A
Newton’s second law of motionB
Newton’s law of gravitationC
Newton’s first law of motionD
Newton’s third law of motionClick an option to check your answer
Q. 18
Who deduced that objects move with a constant speed when no force acts on them?
A
Johannes KeplerB
Isaac NewtonC
Galileo GalileiD
Albert EinsteinClick an option to check your answer
Q. 19
A body will continue in its state of rest or uniform motion in a straight line, unless acted by some external force. The statement represents:
A
Newton's third law of motionB
Law of conservation of momentumC
Newton's second law of motionD
Newton's first law of motionClick an option to check your answer
Q. 20
The inertia of an object tends to cause the object ______.
A
to increase its speed.B
to decrease its speed.C
to decelerate due to friction.D
to resist any change in the state of rest or motion.Click an option to check your answer
Q. 21
While dusting a carpet we beat it with a stick because:
A
No inertia is involved.B
Force applied on the carpet.C
Inertia of motion removes the dust.D
Inertia of rest keeps the dust.Click an option to check your answer
Q. 22
What effect does an unbalanced force have on an object?
A
It has no effectB
It only affects light objectsC
It changes the object's speedD
It stops the object's motionClick an option to check your answer
Q. 23
If an unbalanced force is removed, what happens to an object's motion?
A
It acceleratesB
It changes directionC
It continues with the same velocityD
It stops immediatelyClick an option to check your answer
Q. 24
A child on a cart with wheels throws a sandbag forward. As a result:
A
He moves to the right.B
He moves to the left.C
He moves backward.D
He moves forward.Click an option to check your answer
Q. 25
What happens when you push against a wall?
A
The wall moves awayB
You feel no forceC
The wall pushes back with equal forceD
You fall overClick an option to check your answer
Q. 26
A cyclist of mass 30 kg exerts a force of 250 N to move his cycle. The acceleration is 4 m/s². The force of friction will be:
A
115 NB
150 NC
120 ND
130 NClick an option to check your answer
Q. 27
The S.I. unit of force is
A
Newton-metreB
Newton per square metreC
NewtonD
Newton per secondClick an option to check your answer
Q. 28
What is the relationship between velocity and momentum?
A
Momentum is independent of velocityB
They are unrelatedC
Velocity affects momentumD
Momentum is always zeroClick an option to check your answer
Q. 29
What does Galileo's marble demonstrate when released on an ideal frictionless plane?
A
It moves in a circleB
It rolls down foreverC
It stops immediatelyD
It rolls and returns to the same heightClick an option to check your answer
Q. 30
How does pushing the ground allow you to walk forward?
A
You pull the groundB
You push the ground backwardC
You exert no forceD
You create a vacuumClick an option to check your answer
Q. 31
What did Galileo discover about the relationship between time and distance for uniformly accelerated objects?
A
Distance is proportional to time squaredB
Time is irrelevantC
Distance is proportional to speedD
Distance is constantClick an option to check your answer
Q. 32
Newton’s third law of motion explains the two forces ‘action’ and ‘reaction’. These two forces:
A
Always act on different bodies in opposite directions.B
Have the same magnitude and direction.C
Always act on the same body.D
Acts on either body at normal to each other.Click an option to check your answer
Q. 33
How does mass relate to inertia?
A
More mass means less inertiaB
Mass is unrelated to inertiaC
More mass means more inertiaD
Mass decreases inertiaClick an option to check your answer
Q. 34
What force can change the velocity of a body of mass 1kg from 20 m/s to 30 m/s in 2 seconds?
A
25 NB
15 NC
5 ND
10 NClick an option to check your answer
Q. 35
A carpenter exerts a force of magnitude 1.5 N at right angles to the surface of a nail of mass 3 grams to drive it into the wood. If wood offers a resistive force of 0.6 N and the time of interaction of hammer and the nail 0.01 s, the depth through which the nail penetrates is:
A
1.5 mmB
15 cmC
15 mD
1.5 cmClick an option to check your answer
Q. 36
What happens when the brakes are suddenly applied in a moving car?
A
Passengers remain stationaryB
The passengers move backwardC
The car slows down but the passengers lurch forwardD
The car stops instantlyClick an option to check your answer
Q. 37
A force F acts on a stationary body for the time t. The distance covered by the body 'S' will be proportional to:
A
1/t²B
tC
1/tD
t²Click an option to check your answer
Q. 38
In a high jump competition the athlete is made to fall on a cushioned bed to:
A
Make him stop quicklyB
Make him sleep comfortablyC
To decrease his momentum fastD
Increase the time to stopClick an option to check your answer
Q. 39
Which of the following has the largest momentum?
A
A car parked in a parking lotB
A pickup truck travelling down the highwayC
A cat running down the streetD
A large truck parked in a parking lotClick an option to check your answer
Q. 40
When no external force acts on an object, the physical quantity that remains conserved is______.
A
momentumB
forceC
velocityD
accelerationClick an option to check your answer
Q. 41
The acceleration of an object is inversely proportional to:
A
VelocityB
ForceC
MomentumD
MassClick an option to check your answer
Q. 42
What is the momentum of a body of mass 2m and velocity v/2?
A
mv/4B
mv/2C
mvD
2mvClick an option to check your answer
Q. 43
Change in momentum when a car weighing 700 kg changes its speed from 100 m/s to 200 m/s is:
A
14000 kg·m/sB
21000000 kg·m/sC
70000 kg·m/sD
10500000 kg·m/sClick an option to check your answer
Q. 44
A person standing on a weighing scale sees a reading on the scale as 148 pounds. This person is acted on by:
A
No forces at all.B
Two forces of equal magnitude acting in opposite directions.C
Only one force of 148 pounds, as shown by the reading on the scale.D
Only one force, of 296 pounds.Click an option to check your answer
Q. 45
A force F produces an acceleration 'a' in a body. The same force produces an acceleration 4a in another body. The mass of the other body is:
A
Four times the mass of first bodyB
Four times less the mass of other bodyC
Mass does not play roleD
None of the aboveClick an option to check your answer
Q. 46
What major theory did Galileo propose that contradicted prevailing beliefs of his time?
A
Sun revolves around the EarthB
Stars are fixed in the skyC
Planets orbit the SunD
Earth is flatClick an option to check your answer
Q. 47
The impact which a body can produce due to the combined effect of mass and velocity is called:
A
Moment of forceB
ForceC
PressureD
MomentumClick an option to check your answer
Q. 48
When the driver of a fast-moving car suddenly applies brakes, the passengers in the car:
A
Fall backwardB
Fall forwardC
Are not affectedD
None of the aboveClick an option to check your answer
Q. 49
There is a rubber ball and a stone ball of the same size. If both balls are at rest:
A
Rubber ball has more inertia than stone ballB
Stone ball has more inertia than rubber ballC
Both have the same inertiaD
None of the aboveClick an option to check your answer
Q. 50
If no external force acts on a body, it will:
A
Break into piecesB
Move with more speedC
Either remain in its state of rest or in uniform motionD
Change its shapeClick an option to check your answer
Q. 51
What invention is Galileo credited with creating around 1640?
A
First pendulum clockB
First barometerC
First telescopeD
First microscopeClick an option to check your answer
Q. 52
Which of the following is the relation between SI unit of gravitational force and Newton?
A
1 kg m s⁻² = 1 NB
1 kg wt = 9.8 NC
1 dyne = 1 g cm s⁻²D
1 N = 10⁵ dynesClick an option to check your answer
Q. 53
The relation between acceleration, mass and force is given by:
A
a x F = mB
F x m = aC
a = F/mD
F = m/aClick an option to check your answer
Q. 54
The tendency of a body to continue in its state of rest or uniform motion, even on the application of external force is called:
A
InertiaB
MomentumC
ForceD
ImpulseClick an option to check your answer
Q. 55
Two balls A and B, of masses m and 2m are in motion with velocities 2v and v respectively. Compare the force needed to stop them in the same time.
A
2 : 1B
1 : 2C
1 : 1D
None of the aboveClick an option to check your answer
Q. 56
What does the second law of motion state?
A
Force equals mass times accelerationB
An object at rest will stay at restC
The rate of change of momentum is constantD
Momentum is independent of massClick an option to check your answer
Q. 57
What is the first law of motion also known as?
A
Law of FrictionB
Law of AccelerationC
Law of GravityD
Law of InertiaClick an option to check your answer
Q. 58
When balanced forces act on a body, the body:
A
Must remain in its state of restB
Moving with constant velocityC
Both (A) and (B)D
None of the aboveClick an option to check your answer
Q. 59
To keep an object moving, what must be applied?
A
Balanced forcesB
Unbalanced forcesC
No forces at allD
Only frictional forcesClick an option to check your answer
Q. 60
In a football and stone of the same size, the inertia of:
A
Football is greater.B
Stone is greater.C
Both objects is equal.D
None of the above.Click an option to check your answer
Q. 61
What force is required to accelerate a 2 kg mass at 5 m/s²?
A
6 NB
8 NC
10 ND
12 NClick an option to check your answer
Q. 62
The acceleration of an object is______.
A
inversely proportional to its mass.B
directly proportional to the applied force.C
resisted by inertia.D
all of the above.Click an option to check your answer
Q. 63
What happens when two equal forces act on an object?
A
The object moves in one directionB
The object spinsC
The object does not moveD
The object acceleratesClick an option to check your answer
Q. 64
If no external force acts on a moving object:
A
It will not be affected at all.B
It should remain in motion but will stop due to friction.C
It will stop moving.D
It will remain at rest forever.Click an option to check your answer
Q. 65
The SI unit of momentum is:
A
NewtonB
Newton-secondC
Dyne-secondD
DyneClick an option to check your answer
Q. 66
Equal and opposite forces acting on a body which do not change its state of rest or uniform motion are called:
A
Like parallel forcesB
Unlike parallel forcesC
Balanced forcesD
All the aboveClick an option to check your answer
Q. 67
Momentum of a body of mass 0.5 kg moving with a speed of 10 m/s is:
A
5 kg·m/sB
0.5 kg·m/sC
2.5 kg·m/sD
50 kg·m/sClick an option to check your answer
Q. 68
What did Galileo use to study the motion of objects?
A
BalancesB
TelescopesC
PendulumsD
Inclined planesClick an option to check your answer
Q. 69
A force of magnitude 'F' acts on a body of mass 'm'. The acceleration of the body depends upon:
A
Volume of bodyB
Mass of bodyC
Density of bodyD
Area of bodyClick an option to check your answer
Q. 70
The rate of change of momentum is directly proportional to which of the following?
A
MassB
TimeC
VelocityD
ForceClick an option to check your answer
Q. 71
Which of the following is a correctly matched pair?
A
Momentum - Mass x VelocityB
Acceleration - Rate of change of MomentumC
Unit of Force - Kilogram per secondD
Second Law of Motion - Force = Mass x DistanceClick an option to check your answer
Q. 72
While catching a stone thrown by your friend you pull your hands back to______.
A
avoid getting hurt.B
increase the time to slow down.C
decrease the time to slow down.D
avoid the breaking of the stone.Click an option to check your answer
Q. 73
An archer shoots an arrow. Consider the action force to be the bow string against the arrow. The reaction force is the:
A
Grip of the archer’s hand on the bow.B
Air resistance against the bow.C
Weight of the arrow.D
Arrow pushing against bow string.Click an option to check your answer
Q. 74
Find the time for which a force of 1 kgwt acts on a body of mass 1 kg moving with a uniform speed of 4 m/s to stop the body.
A
0.6 sB
0.8 sC
0.4 sD
0.2 sClick an option to check your answer
Q. 75
The people in a bus are pushed backwards when the bus starts suddenly because of:
A
Inertia due to directionB
Inertia due to restC
External forceD
Inertia due to motionClick an option to check your answer
Q. 76
A resistive force of 16 N acts on a ball of mass 40 g continuously. If the initial velocity of the ball is 24 m/s, the time taken by it to come to rest is:
A
0.06 sB
0.02 sC
0.08 sD
0.04 sClick an option to check your answer
Q. 77
An external influence which changes or tends to change the state of rest or uniform motion of a body or its dimensions is called:
A
MomentumB
Moment of forceC
PressureD
ForceClick an option to check your answer
Q. 78
If you jump off a small boat, what happens to the boat?
A
It moves forwardB
It remains stationaryC
It capsizesD
It moves backwardClick an option to check your answer
Q. 79
Who further developed Galileo’s ideas on force and motion?
A
Albert EinsteinB
Nikola TeslaC
Isaac NewtonD
Johannes KeplerClick an option to check your answer
Q. 80
Momentum is a:
A
Vector quantityB
Scalar quantityC
Fundamental quantityD
None of the aboveClick an option to check your answer
Q. 81
The magnitude of inertia of a body is determined by its:
A
WeightB
AccelerationC
MassD
VelocityClick an option to check your answer
Q. 82
The unequal and opposite forces acting on a body, which change its state of rest or uniform motion are called:
A
Unlike parallel forcesB
Unbalanced forcesC
Like parallel forcesD
All the aboveClick an option to check your answer
Q. 83
What are forces that do not change the state of rest or motion called?
A
Frictional forcesB
Balanced forcesC
Gravitational forcesD
Unbalanced forcesClick an option to check your answer
Q. 84
Why do passengers feel a force when a bus suddenly starts moving?
A
GravityB
FrictionC
Acceleration of the busD
Inertia of their bodiesClick an option to check your answer
Q. 85
The natural tendency of objects to resist a change in their state of rest or uniform motion is called what?
A
InertiaB
FrictionC
MomentumD
AccelerationClick an option to check your answer
Q. 86
Force of friction always acts in the direction:
A
Of applied forceB
Opposite to the direction of applied forceC
At right angles to the direction of applied forceD
None of the aboveClick an option to check your answer
Q. 87
When a bullet is fired from a gun, what happens to the gun?
A
It breaks apartB
It recoils backwardC
It moves forward rapidlyD
It has no movementClick an option to check your answer
Q. 88
According to the second law of Newton, force is the cause and the outcome is______.
A
momentumB
accelerationC
timeD
velocityClick an option to check your answer
Q. 89
What property of an object resists changes in its state of motion?
A
InertiaB
ForceC
MassD
VelocityClick an option to check your answer
Q. 90
When we vigorously shake a branch of a tree, some leaves get detached. It is due to the:
A
Inertia of restB
Inertia of motionC
Some leaves are loosely held by the branchD
None of the aboveClick an option to check your answer
Q. 91
What did Galileo claim to have seen through his telescopes?
A
Rings of SaturnB
Planets orbiting the EarthC
SunspotsD
Mountains on the MoonClick an option to check your answer
Q. 92
If a body is allowed to freely fall from a height, its speed increases continuously. It is because:
A
Pressure of air forces it downwardB
Magnetic force of earth increases its speedC
Air does not exert frictional forceD
Gravitational force of earth increases its speedClick an option to check your answer
Q. 93
Two spring balances pull each other in opposite directions. If the reading of one spring balance is 2 N, the reading shown by the second spring balance will be:
A
3.5 NB
2.0 NC
2.5 ND
3.0 NClick an option to check your answer
Q. 94
When a running motorbike accelerates suddenly, the pillion rider has a tendency to fall backward. This is an example of:
A
Newton's law of gravitation of motionB
Newton's third law of motionC
Newton's first law of motionD
Newton's second law of motionClick an option to check your answer
Q. 95
Which is the incorrect statement? A spaceship continues moving in space with uniform speed because:
A
No force of gravitation acts on itB
Its mass is zero in spaceC
No force of friction due to air acts on itD
No force of friction due to earth acts on itClick an option to check your answer
Q. 96
How does time influence the force required to change an object’s momentum?
A
Time is irrelevantB
Shorter time requires more forceC
Longer time requires less forceD
Time has no influenceClick an option to check your answer
Q. 97
What can be said about action-reaction forces?
A
They act on different objectsB
They cancel each otherC
They always act on the same objectD
They can be unequalClick an option to check your answer
Q. 98
When unbalanced forces act on a body, the body:
A
Must experience accelerationB
Must move in a curved pathC
Must move with uniform velocityD
Must remain at restClick an option to check your answer
Q. 99
Find the time taken by a body of mass 16 kg to come to rest from a uniform velocity of 10 m/s, when a force of 4N is applied continuously.
A
50 sB
30 sC
20 sD
40 sClick an option to check your answer
Q. 100
What happens when a small force is applied to a large object?
A
It accelerates rapidlyB
It moves easilyC
It moves with great speedD
It hardly movesClick an option to check your answer
Q. 101
Choose the correctly matched pair of action and reaction forces.
A
Action - Pushing the ground backwardsB
Reaction - Bullet accelerationC
Action - Gun recoilD
Reaction - Muscular effort on the roadClick an option to check your answer
Q. 102
When a fireman directs a powerful stream of water from a hose-pipe, the hose-pipe tends to go backward. This is due to:
A
Law of conservation of chargesB
Law of conservation of energyC
Law of InertiaD
Newton’s 3rd lawClick an option to check your answer
Q. 103
If a block is pulled with unequal forces, what will happen?
A
It will not moveB
It will move in the direction of the smaller forceC
It will move in the direction of the greater forceD
It will rotateClick an option to check your answer
Q. 104
Why might two objects experience different accelerations when equal forces are applied?
A
They are at restB
They have different massesC
They have the same massD
They are in a vacuumClick an option to check your answer
Q. 105
Which scenario best illustrates Newton's third law of motion?
A
A person pushing a shopping cartB
A car accelerating on a highwayC
A child swinging on a swingD
A rocket taking offClick an option to check your answer
Q. 106
How is momentum defined?
A
Mass times velocityB
Velocity divided by massC
Mass times forceD
Force divided by massClick an option to check your answer
Q. 107
What happens if the pushing force exceeds the frictional force?
A
The box bouncesB
The box movesC
The box stops movingD
The box rotatesClick an option to check your answer
Q. 108
In a game of football, what happens when a player kicks the ball?
A
The ball does not moveB
The player feels no forceC
Both player and ball exert forcesD
Only the ball movesClick an option to check your answer
Q. 109
What does the third law of motion state?
A
Force equals mass times accelerationB
An object at rest stays at restC
For every action, there is an equal and opposite reactionD
An object in motion stays in motionClick an option to check your answer
Q. 110
In the context of action-reaction forces, what are action and reaction forces?
A
Forces that act on different objectsB
Forces that act on the same objectC
Forces that can change directionD
Forces that always balance each otherClick an option to check your answer
Q. 111
Which is incorrect statement about action and reaction forces?
A
They act on different objects.B
They are equal.C
They act on the same object.D
They are opposite.Click an option to check your answer
Q. 112
When is an object said to be in uniform motion?
A
When it changes directionB
When forces are balancedC
When forces are unbalancedD
When friction is zeroClick an option to check your answer
Q. 113
When riding a bicycle, what causes it to slow down when pedaling stops?
A
GravityB
FrictionC
Air resistanceD
Balanced forcesClick an option to check your answer
Q. 114
A body P has mass 2m and velocity 5v. Another body Q has mass 8m and velocity 1.25v. The ratio of momentum of P and Q is:
A
2:1B
3:2C
1:2D
1:1Click an option to check your answer
Q. 115
Which of the following is an equation of motion of a body?
A
Ft = mv - muB
v = u + atC
p = mvD
F = maClick an option to check your answer
Q. 116
Which of the following scenarios demonstrates inertia?
A
A ball rolling downhillB
A parked car remaining stillC
A car accelerating rapidlyD
A balloon flying awayClick an option to check your answer
Q. 117
What will happen to an object at rest unless acted upon by an unbalanced force?
A
It will accelerateB
It will remain at restC
It will move in a circleD
It will fallClick an option to check your answer
Q. 118
In a high jump, landing on a cushioned bed increases what?
A
Risk of injuryB
Time of impactC
Height of jumpD
Speed of descentClick an option to check your answer
Q. 119
A player is catching a ball. Consider the action force to be the impact of the ball against the player’s glove. What is the reaction force?
A
Force that the glove exerts on the ball.B
The player's grip on the ball.C
Friction of the ground.D
The muscular effort in the player’s arm.Click an option to check your answer
Q. 120
What is the term used to describe the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity?
A
InertiaB
MomentumC
AccelerationD
GravitationClick an option to check your answer
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