100 Important MCQs (Level -1) on Motion and Force, Physics (Unit-Wise MCQs Practice):
Whether you are preparing for board examinations, school tests, college assessments, university exams, entry tests, or competitive examinations, this comprehensive Motion and Force MCQs collection is designed to strengthen your conceptual understanding and problem-solving skills.
This chapter covers all the fundamental and advanced topics of motion and force, including scalar and vector quantities, displacement, distance, speed, velocity, acceleration, equations of uniformly accelerated motion, projectile motion, Newton's Laws of Motion, mass, weight, momentum, impulse, collisions, conservation of momentum, graph interpretation, and real-life applications of mechanics.
The MCQs are carefully organized into three progressive difficulty levels to help learners build confidence step by step:
- 100 Basic Conceptual MCQs – Develop a strong foundation by covering definitions, principles, formulas, and essential concepts.
- 100 Advanced & Numerical MCQs – Improve analytical and mathematical problem-solving skills through calculations and application-based questions.
- 50 Higher-Order Thinking Skills (HOTS) MCQs – Challenge your understanding with conceptual reasoning, graph analysis, multi-step problems, and competitive examination-style questions.
- 50 Challenging MCQs Quiz with Answers (1–50) – Carefully selected conceptual, numerical, and HOTS questions to strengthen problem-solving skills and prepare students for board and competitive examinations.
Every MCQ includes:
- ✔ Four carefully designed answer options
- ✔ Instant correct answer
- ✔ Detailed concept-based explanation
- ✔ Exam-focused learning approach
This collection is ideal for students preparing for Physics examinations at school, college, and university levels, as well as candidates appearing in engineering, medical, and other competitive entrance examinations. Teachers can also use these questions for classroom assessments, quizzes, assignments, and revision sessions.
By practicing these 250 carefully selected Motion and Force MCQs, you will improve your conceptual clarity, numerical problem-solving ability, graph interpretation skills, logical reasoning, and confidence in tackling objective-type Physics questions. Whether you are revising before an examination or strengthening your fundamentals, this comprehensive MCQ collection provides an excellent resource for complete chapter preparation and long-term success.
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Level-II – 100 Advanced & Numerical MCQs (MCQs 101–200)
Part-1: MCQs (51–75) Basic Conceptual MCQs (1–25)
Motion and Force
MCQ No. 1
Displacement is a:
a. Scalar quantity
b. Vector quantity
c. Dimensionless quantity
d. Random quantity
Correct Answer: b. Vector quantity
Explanation: Displacement has both magnitude and direction, making it a vector quantity.
MCQ No. 2
Which of the following is a vector quantity?
a. Distance
b. Speed
c. Displacement
d. Time
Correct Answer: c. Displacement
Explanation: Displacement has both magnitude and direction, whereas the others are scalar quantities.
MCQ No. 3
Displacement is defined as:
a. Total path travelled
b. Shortest distance between initial and final positions with direction
c. Distance travelled in one second
d. Rate of change of distance
Correct Answer: b. Shortest distance between initial and final positions with direction
Explanation: Displacement gives the shortest straight-line path along with its direction.
MCQ No. 4
Average speed differs from average velocity because average speed depends on:
a. Direction
b. Displacement
c. Distance travelled
d. Acceleration
Correct Answer: c. Distance travelled
Explanation: Average speed is based on total distance, while average velocity depends on displacement.
MCQ No. 5
Instantaneous velocity means:
a. Average velocity
b. Velocity at a particular instant
c. Constant velocity
d. Variable velocity
Correct Answer: b. Velocity at a particular instant
Explanation: Instantaneous velocity is the velocity of an object at a specific moment.
MCQ No. 6
Which of the following can be negative?
a. Speed
b. Distance
c. Mass
d. Velocity
Correct Answer: d. Velocity
Explanation: Velocity can be positive or negative depending on its direction.
MCQ No. 7
Velocity is defined as:
a. Distance per unit time
b. Displacement per unit time
c. Acceleration per unit time
d. Distance multiplied by time
Correct Answer: b. Displacement per unit time
Explanation: Velocity is the rate of change of displacement with time.
MCQ No. 8
The slope of a displacement–time graph represents:
a. Speed
b. Acceleration
c. Velocity
d. Distance
Correct Answer: c. Velocity
Explanation: Slope equals change in displacement divided by time, which is velocity.
MCQ No. 9
The instantaneous velocity of an object can be determined by:
a. Area under displacement–time graph
b. Slope of displacement–time graph
c. Area under velocity–time graph
d. Slope of distance–time graph
Correct Answer: b. Slope of displacement–time graph
Explanation: The slope of the tangent to a displacement–time graph gives instantaneous velocity.
MCQ No. 10
A horizontal displacement–time graph indicates that the object is:
a. Moving uniformly
b. Accelerating
c. At rest
d. Retarding
Correct Answer: c. At rest
Explanation: A horizontal graph means displacement does not change with time.
MCQ No. 11
Area under a velocity–time graph gives:
a. Acceleration
b. Speed
c. Displacement
d. Force
Correct Answer: c. Displacement
Explanation: The area under the graph represents the displacement of the object.
MCQ No. 12
The slope of a velocity–time graph represents:
a. Velocity
b. Speed
c. Acceleration
d. Distance
Correct Answer: c. Acceleration
Explanation: The slope shows the rate of change of velocity with time.
MCQ No. 13
Acceleration is defined as:
a. Rate of change of distance
b. Rate of change of velocity
c. Rate of change of displacement
d. Velocity per unit distance
Correct Answer: b. Rate of change of velocity
Explanation: Acceleration measures how quickly velocity changes with time.
MCQ No. 14
Average acceleration is equal to:
a. Δs/Δt
b. Δv/Δt
c. Δa/Δt
d. s/t²
Correct Answer: b. Δv/Δt
Explanation: Average acceleration is the change in velocity divided by the time taken.
MCQ No. 15
Instantaneous acceleration is:
a. Average acceleration over a long time
b. Acceleration at a particular instant
c. Zero acceleration
d. Constant acceleration only
Correct Answer: b. Acceleration at a particular instant
Explanation: It is the acceleration at a specific instant of time.
MCQ No. 16
Negative acceleration is commonly called:
a. Momentum
b. Force
c. Retardation (Deceleration)
d. Velocity
Correct Answer: c. Retardation (Deceleration)
Explanation: Negative acceleration reduces the velocity of a moving object.
MCQ No. 17
Uniform acceleration means:
a. Constant velocity
b. Constant acceleration
c. Zero acceleration
d. Increasing speed only
Correct Answer: b. Constant acceleration
Explanation: Equal changes in velocity occur in equal intervals of time.
MCQ No. 18
Variable acceleration means:
a. Acceleration remains constant
b. Velocity is zero
c. Acceleration changes with time
d. Distance is constant
Correct Answer: c. Acceleration changes with time
Explanation: Variable acceleration is not constant throughout the motion.
MCQ No. 19
If the velocity–time graph is a straight horizontal line, the acceleration is:
a. Constant
b. Increasing
c. Zero
d. Negative
Correct Answer: c. Zero
Explanation: Constant velocity means there is no acceleration.
MCQ No. 20
Which equation of motion gives displacement directly?
a. v = u + at
b. a = Δv/Δt
c. s = ut + ½at²
d. v² = u² + 2as
Correct Answer: c. s = ut + ½at²
Explanation: This equation directly calculates displacement for uniform acceleration.
MCQ No. 21
The equation v² = u² + 2as is valid for:
a. Circular motion
b. Variable acceleration
c. Uniform acceleration
d. Rotational motion
Correct Answer: c. Uniform acceleration
Explanation: This equation applies only when acceleration remains constant.
MCQ No. 22
The SI unit of acceleration is:
a. m/s
b. m/s²
c. N
d. kg·m/s
Correct Answer: b. m/s²
Explanation: Acceleration is the change in velocity per second.
MCQ No. 23
A freely falling object moves with:
a. Zero acceleration
b. Constant acceleration due to gravity
c. Variable acceleration
d. Constant velocity
Correct Answer: b. Constant acceleration due to gravity
Explanation: In free fall, the object accelerates downward at approximately 9.8 m/s².
MCQ No. 24
The value of acceleration due to gravity near Earth's surface is approximately:
a. 8 m/s²
b. 9.8 m/s²
c. 10.8 m/s²
d. 12 m/s²
Correct Answer: b. 9.8 m/s²
Explanation: The standard acceleration due to gravity on Earth is about 9.8 m/s².
MCQ No. 25
A body moving with constant speed but changing direction has:
a. Zero acceleration
b. Constant velocity
c. Variable velocity
d. Zero displacement
Correct Answer: c. Variable velocity
Explanation: A change in direction changes the velocity, even if the speed remains constant.
Part-3: Basic Conceptual MCQs (26–50)
Projectile Motion
MCQ No. 26
Projectile motion is an example of:
a. One-dimensional motion
b. Two-dimensional motion
c. Circular motion
d. Rotational motion
Correct Answer: b. Two-dimensional motion
Explanation: Projectile motion consists of both horizontal and vertical motions occurring simultaneously.
MCQ No. 27
In the absence of air resistance, the horizontal component of velocity of a projectile remains:
a. Zero
b. Variable
c. Constant
d. Increasing
Correct Answer: c. Constant
Explanation: Since no horizontal force acts on the projectile, its horizontal velocity remains constant.
MCQ No. 28
The vertical acceleration of a projectile is equal to:
a. Zero
b. Initial velocity
c. Acceleration due to gravity (g)
d. Horizontal velocity
Correct Answer: c. Acceleration due to gravity (g)
Explanation: Gravity acts continuously in the downward direction throughout the motion.
MCQ No. 29
At the highest point of a projectile, the vertical component of velocity is:
a. Maximum
b. Zero
c. Equal to horizontal velocity
d. Negative
Correct Answer: b. Zero
Explanation: At maximum height, the projectile stops moving upward momentarily before descending.
MCQ No. 30
The path followed by a projectile is called:
a. Straight line
b. Circular path
c. Parabolic path
d. Elliptical path
Correct Answer: c. Parabolic path
Explanation: The combination of horizontal and vertical motion produces a parabolic trajectory.
MCQ No. 31
The horizontal and vertical motions of a projectile are:
a. Dependent on each other
b. Independent of each other
c. Equal in magnitude
d. Opposite in direction
Correct Answer: b. Independent of each other
Explanation: The horizontal motion does not affect the vertical motion and vice versa.
MCQ No. 32
For a given initial speed, the maximum horizontal range is obtained when the projectile is launched at:
a. 30°
b. 45°
c. 60°
d. 90°
Correct Answer: b. 45°
Explanation: A launch angle of 45° gives the maximum range on level ground in the absence of air resistance.
MCQ No. 33
Two complementary launch angles produce:
a. Different ranges
b. The same range
c. Maximum height only
d. Zero range
Correct Answer: b. The same range
Explanation: Launch angles θ and (90° − θ) produce equal horizontal ranges for the same initial speed.
MCQ No. 34
The time of flight of a projectile depends upon its:
a. Horizontal component of velocity
b. Mass
c. Vertical component of velocity
d. Shape
Correct Answer: c. Vertical component of velocity
Explanation: The upward component of velocity determines how long the projectile remains in the air.
MCQ No. 35
Air resistance mainly causes the horizontal range of a projectile to:
a. Increase
b. Become zero
c. Decrease
d. Remain unchanged
Correct Answer: c. Decrease
Explanation: Air resistance slows the projectile, reducing both its speed and range.
MCQ No. 36
A projectile launched horizontally has an initial vertical velocity of:
a. Equal to its horizontal velocity
b. 9.8 m/s
c. Zero
d. Maximum
Correct Answer: c. Zero
Explanation: A horizontally launched projectile starts with no vertical component of velocity.
MCQ No. 37
At every point during projectile motion, the acceleration acts:
a. Horizontally forward
b. Along the direction of motion
c. Vertically downward
d. Vertically upward
Correct Answer: c. Vertically downward
Explanation: Gravity acts downward throughout the projectile's motion.
MCQ No. 38
The horizontal range of a horizontally projected body mainly depends upon:
a. Its mass
b. The height of projection
c. Its shape only
d. Atmospheric pressure only
Correct Answer: b. The height of projection
Explanation: Greater height increases the time of flight, resulting in a larger horizontal range.
Newton's Laws of Motion
MCQ No. 39
Newton's First Law of Motion is also known as the:
a. Law of Gravitation
b. Law of Inertia
c. Law of Momentum
d. Law of Energy
Correct Answer: b. Law of Inertia
Explanation: It states that an object resists any change in its state of rest or uniform motion.
MCQ No. 40
The inertia of a body depends upon its:
a. Velocity
b. Volume
c. Mass
d. Shape
Correct Answer: c. Mass
Explanation: The greater the mass, the greater the inertia of the body.
MCQ No. 41
The SI unit of force is:
a. Joule
b. Newton
c. Watt
d. Pascal
Correct Answer: b. Newton
Explanation: One newton is the force required to accelerate a 1 kg mass by 1 m/s².
MCQ No. 42
Newton's Second Law states that force is equal to the rate of change of:
a. Velocity
b. Acceleration
c. Momentum
d. Energy
Correct Answer: c. Momentum
Explanation: Newton's Second Law is expressed as F = dp/dt.
MCQ No. 43
Momentum of a body is equal to:
a. mv²
b. m/v
c. mv
d. v/m
Correct Answer: c. mv
Explanation: Momentum is the product of mass and velocity.
MCQ No. 44
The SI unit of momentum is:
a. Newton
b. Joule
c. kg·m/s
d. Watt
Correct Answer: c. kg·m/s
Explanation: The SI unit of momentum is kilogram metre per second (kg·m/s).
MCQ No. 45
Weight of a body is:
a. Its mass
b. Mass × velocity
c. The gravitational force acting on it
d. Its inertia
Correct Answer: c. The gravitational force acting on it
Explanation: Weight is the force with which Earth attracts a body and is given by W = mg.
MCQ No. 46
Mass is defined as the property of a body that:
a. Produces gravity
b. Resists a change in its state of motion
c. Determines its colour
d. Changes with location
Correct Answer: b. Resists a change in its state of motion
Explanation: Mass is a measure of the inertia of a body.
MCQ No. 47
Newton's Third Law states that:
a. Force equals mass × acceleration.
b. Every action has an equal and opposite reaction.
c. Momentum is never conserved.
d. Every object falls with the same speed.
Correct Answer: b. Every action has an equal and opposite reaction.
Explanation: Action and reaction forces are equal in magnitude, opposite in direction, and act on different bodies.
MCQ No. 48
According to Newton's Third Law, action and reaction forces act on:
a. The same body
b. Different bodies
c. The same point only
d. Equal masses only
Correct Answer: b. Different bodies
Explanation: Since they act on different bodies, they do not cancel each other.
MCQ No. 49
Newton's Laws provide an excellent approximation except when objects move:
a. Very slowly
b. With constant velocity
c. Close to the speed of light or on the quantum scale
d. Under gravity
Correct Answer: c. Close to the speed of light or on the quantum scale
Explanation: At extremely high speeds or very small scales, relativity and quantum mechanics are required.
MCQ No. 50
A passenger falls forward when a moving bus stops suddenly due to:
a. Gravity
b. Friction
c. Inertia
d. Weight
Correct Answer: c. Inertia
Explanation: The passenger's body tends to continue moving forward due to Newton's First Law of Motion.
Part-3: Basic Conceptual MCQs (51–75)
Impulse, Momentum & Conservation of Momentum
MCQ No. 51
Impulse is defined as:
a. Force × Distance
b. Force × Time
c. Mass × Velocity
d. Power × Time
Correct Answer: b. Force × Time
Explanation: Impulse is the product of force and the time for which it acts.
MCQ No. 52
Impulse is numerically equal to the change in:
a. Velocity
b. Momentum
c. Acceleration
d. Energy
Correct Answer: b. Momentum
Explanation: Impulse changes the momentum of a body and is equal to Δp.
MCQ No. 53
The SI unit of impulse is:
a. Newton (N)
b. Joule (J)
c. Newton-second (N·s)
d. Watt (W)
Correct Answer: c. Newton-second (N·s)
Explanation: Impulse has the same SI unit as momentum: N·s or kg·m/s.
MCQ No. 54
Momentum has the same SI unit as:
a. Force
b. Impulse
c. Power
d. Energy
Correct Answer: b. Impulse
Explanation: Both impulse and momentum have the SI unit kg·m/s (or N·s).
MCQ No. 55
A force acting for a very short interval of time is called:
a. Gravitational force
b. Balanced force
c. Impulsive force
d. Frictional force
Correct Answer: c. Impulsive force
Explanation: An impulsive force is very large and acts only for a short time.
MCQ No. 56
A cricket player pulls his hands backward while catching a fast ball to:
a. Increase momentum
b. Increase stopping time
c. Increase force
d. Increase acceleration
Correct Answer: b. Increase stopping time
Explanation: Increasing the stopping time reduces the impact force.
MCQ No. 57
Airbags in cars reduce injuries because they:
a. Increase momentum
b. Increase stopping time
c. Increase acceleration
d. Increase weight
Correct Answer: b. Increase stopping time
Explanation: A longer stopping time reduces the force experienced during a collision.
MCQ No. 58
If the stopping time of a moving body increases, the impact force:
a. Increases
b. Decreases
c. Remains the same
d. Becomes zero
Correct Answer: b. Decreases
Explanation: Force is inversely proportional to the stopping time for the same change in momentum.
MCQ No. 59
The law of conservation of momentum states that the total momentum of an isolated system remains:
a. Zero
b. Constant
c. Infinite
d. Variable
Correct Answer: b. Constant
Explanation: If no external force acts on a system, its total momentum remains constant.
MCQ No. 60
Momentum is conserved when:
a. External force acts on the system
b. No external force acts on the system
c. Kinetic energy is constant only
d. Velocity becomes zero
Correct Answer: b. No external force acts on the system
Explanation: Conservation of momentum applies to isolated systems.
MCQ No. 61
Newton's Third Law provides the basis for the law of conservation of:
a. Energy
b. Momentum
c. Mass
d. Power
Correct Answer: b. Momentum
Explanation: Equal and opposite interaction forces conserve total momentum.
MCQ No. 62
Momentum is conserved during:
a. Elastic collisions only
b. Inelastic collisions only
c. Both elastic and inelastic collisions
d. Perfectly elastic collisions only
Correct Answer: c. Both elastic and inelastic collisions
Explanation: Total momentum remains conserved in every collision if no external force acts.
MCQ No. 63
Kinetic energy is conserved only in:
a. Elastic collisions
b. Inelastic collisions
c. All collisions
d. Explosions
Correct Answer: a. Elastic collisions
Explanation: Only elastic collisions conserve both momentum and kinetic energy.
MCQ No. 64
In a perfectly inelastic collision:
a. Bodies rebound with equal speed
b. Bodies move in opposite directions
c. Bodies stick together after collision
d. Kinetic energy remains constant
Correct Answer: c. Bodies stick together after collision
Explanation: In a perfectly inelastic collision, the colliding bodies move together after impact.
MCQ No. 65
In a perfectly inelastic collision, which quantity is not conserved?
a. Momentum
b. Mass
c. Kinetic energy
d. Total mass
Correct Answer: c. Kinetic energy
Explanation: Some kinetic energy is transformed into heat, sound, or deformation.
MCQ No. 66
An elastic collision is one in which:
a. Only momentum is conserved
b. Only kinetic energy is conserved
c. Both momentum and kinetic energy are conserved
d. Neither momentum nor kinetic energy is conserved
Correct Answer: c. Both momentum and kinetic energy are conserved
Explanation: Elastic collisions conserve both momentum and kinetic energy.
MCQ No. 67
For a perfectly elastic collision, the relative speed of approach is:
a. Greater than the relative speed of separation
b. Less than the relative speed of separation
c. Equal to the relative speed of separation
d. Always zero
Correct Answer: c. Equal to the relative speed of separation
Explanation: This is the defining property of a perfectly elastic collision.
MCQ No. 68
A bullet embedding itself in a wooden block is an example of:
a. Elastic collision
b. Perfectly elastic collision
c. Perfectly inelastic collision
d. Explosion
Correct Answer: c. Perfectly inelastic collision
Explanation: The bullet and block move together after the collision.
MCQ No. 69
An explosion differs from a collision because the objects:
a. Always stick together
b. Move apart after interaction
c. Lose all momentum
d. Have zero kinetic energy
Correct Answer: b. Move apart after interaction
Explanation: In an explosion, a single object breaks into parts that move away from one another.
MCQ No. 70
During an explosion in an isolated system, the total momentum:
a. Increases
b. Decreases
c. Remains conserved
d. Becomes zero
Correct Answer: c. Remains conserved
Explanation: Even though the fragments move apart, total momentum remains constant.
MCQ No. 71
Which quantity is always conserved in both collisions and explosions?
a. Kinetic energy
b. Momentum
c. Velocity
d. Force
Correct Answer: b. Momentum
Explanation: Momentum is conserved in all interactions when no external force acts.
MCQ No. 72
When a gun fires a bullet, the gun recoils due to:
a. Newton's First Law
b. Newton's Second Law
c. Newton's Third Law
d. Law of Gravitation
Correct Answer: c. Newton's Third Law
Explanation: The forward motion of the bullet produces an equal and opposite recoil of the gun.
MCQ No. 73
Walking on the ground is explained by:
a. Newton's First Law
b. Newton's Second Law
c. Newton's Third Law
d. Law of Gravitation
Correct Answer: c. Newton's Third Law
Explanation: Your feet push the ground backward, and the ground pushes you forward.
MCQ No. 74
Which quantity remains unchanged when a body moves from Earth to the Moon?
a. Weight
b. Gravitational force
c. Mass
d. Acceleration due to gravity
Correct Answer: c. Mass
Explanation: Mass is an intrinsic property of matter and does not depend on location.
MCQ No. 75
The weight of a body on the Moon is approximately:
a. Equal to its weight on Earth
b. Twice its weight on Earth
c. One-half of its weight on Earth
d. One-sixth of its weight on Earth
Correct Answer: d. One-sixth of its weight on Earth
Explanation: The Moon's gravitational acceleration is about one-sixth that of the Earth's.
Part-4: Basic Conceptual MCQs (76–100) Application-Based Conceptual MCQs
MCQ No. 76
A body of mass 4 kg moves with a velocity of 5 m/s. Its momentum is:
a. 5 kg·m/s
b. 10 kg·m/s
c. 20 kg·m/s
d. 25 kg·m/s
Correct Answer: c. 20 kg·m/s
Explanation:
Momentum is the product of mass and velocity, given by p = mv. Here, p = 4 × 5 = 20 kg·m/s. Momentum is a vector quantity and has the same direction as the velocity.
MCQ No. 77
A force of 20 N acts on a body for 0.5 s. The impulse produced is:
a. 5 N·s
b. 10 N·s
c. 20 N·s
d. 40 N·s
Correct Answer: b. 10 N·s
Explanation:
Impulse is calculated by multiplying force by the time for which it acts. Using Impulse = F × t = 20 × 0.5 = 10 N·s, the correct answer is 10 N·s.
MCQ No. 78
A stone is dropped freely from rest. Its velocity after 2 s is approximately:
a. 9.8 m/s
b. 15 m/s
c. 19.6 m/s
d. 25 m/s
Correct Answer: c. 19.6 m/s
Explanation:
For a freely falling object, v = gt, where g = 9.8 m/s². Therefore, v = 9.8 × 2 = 19.6 m/s. The velocity is directed downward.
MCQ No. 79
A stone is dropped freely from rest. The distance covered in 2 s is approximately:
a. 9.8 m
b. 14.7 m
c. 19.6 m
d. 39.2 m
Correct Answer: c. 19.6 m
Explanation:
The distance travelled during free fall is given by s = ½gt². Substituting the values gives s = ½ × 9.8 × (2)² = 19.6 m.
MCQ No. 80
If a projectile is launched horizontally from a height, the time of flight mainly depends on:
a. Horizontal velocity
b. Mass of the projectile
c. Height of projection
d. Shape of the projectile
Correct Answer: c. Height of projection
Explanation:
The time of flight depends only on the vertical motion of the projectile. Since gravity controls the vertical motion, the height from which the projectile is launched determines how long it remains in the air.
MCQ No. 81
At the point of projection, the acceleration of a projectile is:
a. Zero
b. Horizontal
c. Vertically downward
d. Along the direction of motion
Correct Answer: c. Vertically downward
Explanation:
From the instant a projectile is launched, gravity acts vertically downward with constant acceleration g. This acceleration remains unchanged throughout the projectile's motion.
MCQ No. 82
Which quantity remains constant throughout projectile motion in the absence of air resistance?
a. Speed
b. Vertical velocity
c. Horizontal velocity
d. Resultant velocity
Correct Answer: c. Horizontal velocity
Explanation:
No horizontal force acts on a projectile when air resistance is neglected. Therefore, its horizontal component of velocity remains constant, while the vertical component changes continuously due to gravity.
MCQ No. 83
If the initial speed of a projectile is doubled while keeping the launch angle unchanged, the horizontal range becomes:
a. Unchanged
b. Double
c. Four times
d. Half
Correct Answer: c. Four times
Explanation:
The horizontal range of a projectile is directly proportional to the square of its initial speed (R ∝ u²). Therefore, doubling the speed increases the range by a factor of four.
MCQ No. 84
The SI unit of acceleration is:
a. m/s
b. m/s²
c. kg·m/s
d. N·s
Correct Answer: b. m/s²
Explanation:
Acceleration is defined as the rate of change of velocity per unit time. Its SI unit is metre per second squared (m/s²).
MCQ No. 85
A body of mass 1 kg has a weight of approximately:
a. 1 N
b. 5 N
c. 9.8 N
d. 98 N
Correct Answer: c. 9.8 N
Explanation:
Weight is calculated using the relation W = mg. For a mass of 1 kg, the weight is 1 × 9.8 = 9.8 N near the Earth's surface.
MCQ No. 86
When a gun fires a bullet, the backward movement of the gun is called:
a. Reflection
b. Recoil
c. Retardation
d. Rotation
Correct Answer: b. Recoil
Explanation:
The bullet moves forward while the gun moves backward due to Newton's Third Law of Motion. This backward motion of the gun is known as recoil.
MCQ No. 87
Walking on the ground is possible because:
a. Gravity pulls us forward.
b. The ground pushes us forward as we push it backward.
c. Air pushes us forward.
d. Our weight decreases.
Correct Answer: b. The ground pushes us forward as we push it backward.
Explanation:
When we walk, our feet exert a backward force on the ground. According to Newton's Third Law, the ground exerts an equal and opposite forward force that moves us ahead.
MCQ No. 88
If two bodies collide and stick together after collision, the collision is:
a. Elastic collision
b. Perfectly elastic collision
c. Perfectly inelastic collision
d. Explosion
Correct Answer: c. Perfectly inelastic collision
Explanation:
In a perfectly inelastic collision, the colliding bodies stick together and move with a common velocity. Although momentum is conserved, kinetic energy is not.
MCQ No. 89
In a perfectly inelastic collision, which quantity is not conserved?
a. Momentum
b. Mass
c. Kinetic energy
d. Total momentum
Correct Answer: c. Kinetic energy
Explanation:
Some of the kinetic energy is converted into heat, sound, or deformation during the collision. However, the total momentum remains conserved if no external force acts.
MCQ No. 90
A bus stops suddenly, causing passengers to move forward. This is due to:
a. Gravity
b. Friction
c. Inertia
d. Momentum only
Correct Answer: c. Inertia
Explanation:
Passengers continue moving forward because their bodies tend to maintain their state of motion. This property of matter is called inertia, as explained by Newton's First Law.
MCQ No. 91
The greater the mass of a body, the greater is its:
a. Speed
b. Acceleration
c. Inertia
d. Velocity
Correct Answer: c. Inertia
Explanation:
Mass is a measure of inertia. Therefore, heavier objects offer greater resistance to changes in their state of rest or motion.
MCQ No. 92
Which equation of motion does not contain time?
a. v = u + at
b. s = ut + ½at²
c. v² = u² + 2as
d. a = (v − u)/t
Correct Answer: c. v² = u² + 2as
Explanation:
This equation directly relates velocity, displacement, and acceleration without involving time. It is especially useful when time is not known.
MCQ No. 93
If the velocity of an object remains constant, its acceleration is:
a. Maximum
b. Zero
c. Negative
d. Increasing
Correct Answer: b. Zero
Explanation:
Acceleration is the rate of change of velocity. If velocity remains constant in both magnitude and direction, there is no change in velocity and hence the acceleration is zero.
MCQ No. 94
According to Newton's Second Law, the product of mass and acceleration gives:
a. Momentum
b. Impulse
c. Force
d. Power
Correct Answer: c. Force
Explanation:
Newton's Second Law states that Force = Mass × Acceleration (F = ma). It explains how force affects the motion of an object.
MCQ No. 95
In the absence of external forces, the momentum of a system:
a. Increases continuously
b. Decreases continuously
c. Remains constant
d. Becomes zero
Correct Answer: c. Remains constant
Explanation:
According to the law of conservation of momentum, the total momentum of an isolated system remains constant unless acted upon by an external force.
MCQ No. 96
Which of the following is a vector quantity?
a. Speed
b. Distance
c. Momentum
d. Time
Correct Answer: c. Momentum
Explanation:
Momentum depends on both mass and velocity. Since velocity has direction, momentum also has both magnitude and direction, making it a vector quantity.
MCQ No. 97
The SI unit of impulse is:
a. Newton
b. Joule
c. Newton-second (N·s)
d. Watt
Correct Answer: c. Newton-second (N·s)
Explanation:
Impulse is the product of force and time. Its SI unit, N·s, is equivalent to the SI unit of momentum, kg·m/s.
MCQ No. 98
Newton's Laws of Motion are not exact when objects move:
a. Very slowly
b. Under gravity
c. Close to the speed of light
d. With constant velocity
Correct Answer: c. Close to the speed of light
Explanation:
At speeds approaching the speed of light, classical mechanics is replaced by Einstein's theory of relativity. Newton's Laws provide only an approximation under such conditions.
MCQ No. 99
Which quantity is always conserved in every collision occurring in an isolated system?
a. Kinetic energy
b. Potential energy
c. Momentum
d. Speed
Correct Answer: c. Momentum
Explanation:
Regardless of the type of collision, the total momentum of an isolated system remains constant. Kinetic energy is conserved only in elastic collisions.
MCQ No. 100
Which statement best describes the importance of Newton's Laws of Motion?
a. They apply only to objects at rest.
b. They explain the motion of all objects under every possible condition.
c. They accurately describe most everyday motions but have limitations at extremely high speeds and very small scales.
d. They apply only to planets and satellites.
Correct Answer: c. They accurately describe most everyday motions but have limitations at extremely high speeds and very small scales.
Explanation:
Newton's Laws successfully explain most motions encountered in daily life and engineering. However, objects moving close to the speed of light or at the atomic and subatomic level require relativistic and quantum theories.
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