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Mechanics and Laws of Motion MCQs 2026

50 questions with detailed answers · 19 from past papers · 5 quiz batches available

📚 Physics Mcqs 📄 19 Past-Paper Qs ✓ Free · No Login Needed
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Read each question, think about the answer, then click Show Answer to reveal the correct option and explanation. Load 10 at a time so it stays manageable — perfect for one-topic study sessions on the bus or during a break.

Page 1 of 1 Questions 1–10 of 50
  1. Q1 medium

    In uniform circular motion, the speed of the body remains constant but its velocity changes because the

    1. A Mass changes continuously
    2. B Acceleration is zero
    3. C Force acting is zero
    4. D Direction of motion keeps changing
    💡 Explanation:

    Velocity is a vector, so even at constant speed it changes whenever the direction of motion changes.

  2. Q2 hard

    Newton's second law of motion can also be expressed as force equal to the rate of change of

    1. A Momentum
    2. B Mass
    3. C Displacement
    4. D Angular velocity
    💡 Explanation:

    In its general form, Newton's second law is F = dp/dt, the rate of change of momentum.

  3. Q3 hard

    The linear velocity v of a point moving in a circle of radius r with angular velocity omega is related by

    1. A v = omega / r
    2. B v = r / omega
    3. C v = r times omega
    4. D v = r + omega
    💡 Explanation:

    Linear velocity equals the radius multiplied by the angular velocity: v = r*omega.

  4. Q4 medium

    A body is said to be in static equilibrium when it

    1. A Moves with constant velocity
    2. B Accelerates uniformly
    3. C Rotates at constant speed
    4. D Remains at rest under balanced forces
    💡 Explanation:

    Static equilibrium means the body is at rest with the net force and net torque both equal to zero.

  5. Q5 medium

    A diagram showing all the forces acting on an isolated body is called a

    1. A Vector diagram
    2. B Free-body diagram
    3. C Circuit diagram
    4. D Phase diagram
    💡 Explanation:

    A free-body diagram isolates a body and shows every force acting on it.

  6. Q6 easy

    A quantity that has both magnitude and direction is called a

    1. A Scalar
    2. B Constant
    3. C Vector
    4. D Coefficient
    💡 Explanation:

    Vector quantities, such as force and velocity, have both magnitude and direction.

  7. Q7 easy

    The shortest straight-line distance between the initial and final position of a body is called its

    1. A Distance
    2. B Speed
    3. C Path length
    4. D Displacement
    💡 Explanation:

    Displacement is the straight-line vector from the initial to the final position.

  8. Q8 easy

    Distance is a scalar quantity while displacement is

    1. A A vector quantity
    2. B Also a scalar quantity
    3. C Dimensionless
    4. D Always zero
    💡 Explanation:

    Unlike distance, displacement has both magnitude and direction, making it a vector quantity.

  9. Q9 easy

    The rate of change of displacement with time is called

    1. A Speed
    2. B Velocity
    3. C Acceleration
    4. D Momentum
    💡 Explanation:

    Velocity is defined as the rate of change of displacement with respect to time.

  10. Q10 Past Paper · PPSC/FPSC/NTS medium

    For a body moving with uniform acceleration a and initial velocity u, the velocity after time t is given by

    1. A v = u + 2at
    2. B v = u - at
    3. C v = u + at
    4. D v = at
    💡 Explanation:

    This is the first equation of motion: v = u + at.

  11. Q11 Past Paper · PPSC/FPSC/NTS medium

    The equation v^2 = u^2 + 2as relates final velocity to

    1. A Time and mass
    2. B Mass and distance
    3. C Time and acceleration only
    4. D Initial velocity, acceleration, and distance
    💡 Explanation:

    This third equation of motion connects final velocity with initial velocity, acceleration, and distance travelled.

  12. Q12 Past Paper · PPSC/FPSC/NTS medium

    The equation of motion s = ut + (1/2)at^2 gives the

    1. A Final velocity
    2. B Distance covered
    3. C Average acceleration
    4. D Momentum
    💡 Explanation:

    This second equation of motion gives the distance covered under uniform acceleration.

  13. Q13 Past Paper · PPSC/FPSC/NTS medium

    The path followed by a projectile under gravity, neglecting air resistance, is a

    1. A Parabola
    2. B Straight line
    3. C Circle
    4. D Ellipse
    💡 Explanation:

    A projectile launched at an angle follows a parabolic trajectory under uniform gravity.

  14. Q14 Past Paper · PPSC/FPSC/NTS medium

    For a projectile launched from the ground, the angle of projection that gives the maximum horizontal range is

    1. A 30 degrees
    2. B 60 degrees
    3. C 45 degrees
    4. D 90 degrees
    💡 Explanation:

    Range is maximum when the projection angle is 45 degrees, since sin(2*45) = 1.

  15. Q15 Past Paper · PPSC/FPSC/NTS easy

    The acceleration due to gravity near the Earth's surface is approximately

    1. A 6.4 m/s^2
    2. B 3.8 m/s^2
    3. C 12.6 m/s^2
    4. D 9.8 m/s^2
    💡 Explanation:

    The standard acceleration due to gravity near Earth's surface is about 9.8 m/s^2.

  16. Q16 Past Paper · PPSC/FPSC/NTS easy

    The weight of a body is the force with which the Earth attracts it, and its SI unit is the

    1. A Kilogram
    2. B Newton
    3. C Joule
    4. D Pascal
    💡 Explanation:

    Weight is a force, so like all forces it is measured in newtons in the SI system.

  17. Q17 medium

    Unlike mass, the weight of a body

    1. A Is always constant everywhere
    2. B Is measured in kilograms
    3. C Varies with the local value of gravity
    4. D Has no direction
    💡 Explanation:

    Weight equals mass times local gravitational acceleration, so it changes with location while mass stays constant.

  18. Q18 medium

    A frame of reference in which Newton's laws of motion hold true without modification is called an

    1. A Inertial frame
    2. B Non-inertial frame
    3. C Rotating frame
    4. D Accelerated frame
    💡 Explanation:

    An inertial frame is one that is not accelerating, in which Newton's laws apply directly.

  19. Q19 medium

    An astronaut floating freely inside an orbiting spacecraft, in the absence of a net force, illustrates

    1. A Newton's third law
    2. B Newton's second law
    3. C The law of gravitation
    4. D Newton's first law (inertia)
    💡 Explanation:

    With no net force acting, the astronaut continues in uniform motion, an example of the law of inertia.

  20. Q20 medium

    The recoil of a gun when a bullet is fired is best explained by the

    1. A Law of gravitation
    2. B Law of conservation of momentum
    3. C Law of friction
    4. D Principle of moments
    💡 Explanation:

    The momentum of the bullet forward is balanced by an equal and opposite momentum of the gun recoiling backward.

  21. Q21 medium

    When a person walks forward, the forward force on the person is the reaction to the force the foot exerts

    1. A On the person's own body
    2. B On the air
    3. C Backward on the ground
    4. D Upward against gravity
    💡 Explanation:

    By Newton's third law, the ground pushes the foot forward in reaction to the foot pushing backward on the ground.

  22. Q22 medium

    The maximum value of static friction is generally

    1. A Greater than kinetic friction
    2. B Less than kinetic friction
    3. C Equal to zero
    4. D Equal to the normal force
    💡 Explanation:

    The maximum static friction is usually slightly greater than the kinetic friction between the same surfaces.

  23. Q23 medium

    The rate of change of angular velocity with time is called

    1. A Angular displacement
    2. B Angular acceleration
    3. C Linear velocity
    4. D Torque
    💡 Explanation:

    Angular acceleration is defined as the rate of change of angular velocity with respect to time.

  24. Q24 medium

    The apparent outward force felt in a rotating frame of reference is called

    1. A Centripetal force
    2. B Gravitational force
    3. C Normal force
    4. D Centrifugal force
    💡 Explanation:

    Centrifugal force is a pseudo-force felt in a rotating frame, apparently pushing objects outward.

  25. Q25 medium

    If the net (resultant) force acting on a body is zero, the body is said to be in a state of

    1. A Equilibrium
    2. B Uniform acceleration
    3. C Free fall
    4. D Circular motion
    💡 Explanation:

    A zero net force means there is no acceleration, so the body is in equilibrium.

  26. Q26 medium

    The single force that produces the same effect as two or more forces acting together on a body is called the

    1. A Applied force
    2. B Balanced force
    3. C Resultant force
    4. D Frictional force
    💡 Explanation:

    The resultant force is the vector sum of all forces acting on a body.

  27. Q27 Past Paper · PPSC/FPSC/NTS easy

    The SI unit of force is the

    1. A Dyne
    2. B Newton
    3. C Erg
    4. D Watt
    💡 Explanation:

    The newton is the SI unit of force, equal to one kg.m/s^2.

  28. Q28 easy

    Force is generally defined as any influence that can cause a body to

    1. A Change its state of rest or motion
    2. B Remain permanently at rest
    3. C Lose its mass
    4. D Change its chemical composition
    💡 Explanation:

    A force is a push or pull that can change a body's state of rest or motion.

  29. Q29 medium

    According to Newton's third law, action and reaction forces always act on

    1. A The same body
    2. B The same point
    3. C Parallel bodies
    4. D Two different bodies
    💡 Explanation:

    Action and reaction forces act on two different interacting bodies, never on the same body.

  30. Q30 medium

    The forward propulsion of a rocket in the vacuum of space is best explained by the

    1. A Presence of air to push against
    2. B Law of gravitation
    3. C Law of conservation of momentum
    4. D Centripetal force
    💡 Explanation:

    A rocket is propelled forward as it expels exhaust gases backward, conserving total momentum.

  31. Q31 easy

    Walking on the ground would be very difficult without sufficient

    1. A Gravity
    2. B Friction
    3. C Momentum
    4. D Torque
    💡 Explanation:

    Friction between the feet and the ground provides the grip needed to push off and walk forward.

  32. Q32 medium

    Quickly pulling a tablecloth out from under dishes without disturbing them demonstrates the

    1. A Law of conservation of energy
    2. B Law of friction
    3. C Third law of motion
    4. D Law of inertia (first law of motion)
    💡 Explanation:

    The dishes tend to remain at rest due to their inertia while the cloth is pulled away quickly.

  33. Q33 Past Paper · PPSC/FPSC/NTS medium

    The SI unit of torque is

    1. A Newton-metre
    2. B Joule-second
    3. C Watt
    4. D Pascal
    💡 Explanation:

    Torque is measured in newton-metres (N.m).

  34. Q34 medium

    Torque is defined as the product of force and the

    1. A Mass of the body
    2. B Time of application
    3. C Perpendicular distance from the axis
    4. D Velocity of the body
    💡 Explanation:

    Torque equals force multiplied by the perpendicular distance from the axis of rotation (moment arm).

  35. Q35 easy

    Angular velocity is measured in units of

    1. A Metres per second
    2. B Radians per second
    3. C Newtons
    4. D Joules
    💡 Explanation:

    Angular velocity describes the rate of change of angular displacement, measured in radians per second.

  36. Q36 Past Paper · PPSC/FPSC/NTS hard

    The centripetal force required to keep a body of mass m moving in a circle of radius r with speed v is given by

    1. A mv^2/r
    2. B mv/r
    3. C mvr
    4. D mr/v^2
    💡 Explanation:

    The centripetal force formula is F = mv^2/r.

  37. Q37 Past Paper · PPSC/FPSC/NTS medium

    In uniform circular motion, the centripetal force acts

    1. A Away from the center
    2. B Tangent to the path
    3. C Towards the center
    4. D Opposite to velocity
    💡 Explanation:

    Centripetal force always acts towards the center of the circular path, keeping the body in orbit.

  38. Q38 medium

    Compared to sliding friction, rolling friction is generally

    1. A Equal
    2. B Less
    3. C Greater
    4. D Infinite
    💡 Explanation:

    Rolling friction is usually much smaller than sliding friction between the same surfaces.

  39. Q39 medium

    The coefficient of friction is defined as the ratio of

    1. A Normal force to friction force
    2. B Mass to weight
    3. C Velocity to acceleration
    4. D Friction force to normal force
    💡 Explanation:

    The coefficient of friction is the ratio of the frictional force to the normal reaction force.

  40. Q40 medium

    The type of friction that acts on a body at rest is called

    1. A Static friction
    2. B Kinetic friction
    3. C Rolling friction
    4. D Fluid friction
    💡 Explanation:

    Static friction acts between surfaces that are not in relative motion.

  41. Q41 Past Paper · PPSC/FPSC/NTS easy

    The force that opposes relative motion between two surfaces in contact is called

    1. A Tension
    2. B Friction
    3. C Normal force
    4. D Centripetal force
    💡 Explanation:

    Friction is the resistive force that opposes relative sliding motion between two surfaces.

  42. Q42 medium

    The SI unit of impulse is the same as that of

    1. A Force
    2. B Energy
    3. C Momentum
    4. D Power
    💡 Explanation:

    Impulse equals change in momentum, so both are measured in kg.m/s (or equivalently N.s).

  43. Q43 medium

    Impulse is defined as the product of force and

    1. A Mass
    2. B Distance
    3. C Velocity
    4. D Time
    💡 Explanation:

    Impulse equals force multiplied by the time for which it acts, and equals the change in momentum.

  44. Q44 Past Paper · PPSC/FPSC/NTS medium

    According to the law of conservation of momentum, the total momentum of an isolated system

    1. A Remains constant
    2. B Always increases
    3. C Always decreases
    4. D Becomes zero
    💡 Explanation:

    In the absence of external forces, the total momentum of a system remains constant.

  45. Q45 Past Paper · PPSC/FPSC/NTS medium

    The SI unit of momentum is

    1. A Newton
    2. B Kilogram metre per second
    3. C Joule
    4. D Watt
    💡 Explanation:

    Since momentum equals mass times velocity, its SI unit is kg.m/s.

  46. Q46 Past Paper · PPSC/FPSC/NTS easy

    Momentum of a body is defined as the product of its

    1. A Mass and velocity squared
    2. B Mass and acceleration
    3. C Mass and velocity
    4. D Weight and velocity
    💡 Explanation:

    Momentum p is defined as p = mv, the product of mass and velocity.

  47. Q47 Past Paper · PPSC/FPSC/NTS easy

    The property of a body by which it resists any change in its state of rest or motion is called

    1. A Momentum
    2. B Inertia
    3. C Force
    4. D Torque
    💡 Explanation:

    Inertia is the natural tendency of a body to resist a change in its state of motion.

  48. Q48 Past Paper · PPSC/FPSC/NTS easy

    Newton's third law states that for every action there is an equal and opposite

    1. A Mass
    2. B Velocity
    3. C Acceleration
    4. D Reaction
    💡 Explanation:

    Newton's third law states action and reaction forces are equal in magnitude and opposite in direction.

  49. Q49 Past Paper · PPSC/FPSC/NTS easy

    Newton's second law of motion states that force equals

    1. A Mass times acceleration
    2. B Mass divided by acceleration
    3. C Mass times velocity
    4. D Mass times displacement
    💡 Explanation:

    Newton's second law is expressed as F = ma.

  50. Q50 Past Paper · PPSC/FPSC/NTS easy

    Newton's first law of motion is also known as the law of

    1. A Law of Acceleration
    2. B Law of Action-Reaction
    3. C Law of Inertia
    4. D Law of Gravitation
    💡 Explanation:

    Newton's first law is called the law of inertia because it describes a body's tendency to resist changes in motion.

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