Classical Mechanics MCQs

1. Which law of motion states that every object persists in its state of rest or uniform motion unless acted upon by an external force? A. Newton’s First Law B. Newton’s Second Law C. Newton’s Third Law D. Law of Inertia Answer: A. Newton’s First Law 2. What quantity is defined as the rate of change of momentum of an object? A. Force B. Acceleration C. Impulse D. Inertia Answer: A. Force 3. Which of the following is not a unit of force in the SI system? A. Newton B. Dyne C. Pascal D. Joule Answer: D. Joule 4. Newton’s Second Law of Motion can be mathematically expressed as: A. $F=ma$ B. $F=m/a$ C. $F=m\cdot a$ D. $F=m-a$ Answer: A. $F=ma$ 5. The momentum of an object is given by: A. $p=mv$ B. $p=ma$ C. $p=F$ D. p=12mv2p = \frac{1}{2} mv^2p=21​mv2 Answer: A. $p=mv$ 6. Which law of motion states that for every action, there is an equal and opposite reaction? A. Newton’s First Law B. Newton’s Second Law C. Newton’s Third Law D. Law of Gravitation Answer: C. Newton’s Third Law 7. The gravitational force between two masses is proportional to the product of their masses and inversely proportional to the square of the distance between them. This statement describes: A. Newton’s First Law B. Newton’s Second Law C. Newton’s Third Law D. Law of Universal Gravitation Answer: D. Law of Universal Gravitation 8. Which of the following is not a conservative force? A. Gravitational force B. Frictional force C. Electrostatic force D. Spring force Answer: B. Frictional force 9. Work done by a force is defined as: A. Force times velocity B. Force times displacement in the direction of the force C. Force divided by displacement D. Force squared divided by displacement Answer: B. Force times displacement in the direction of the force 10. The unit of work in the SI system is: A. Joule B. Watt C. Newton D. Pascal Answer: A. Joule 11. Which of the following is a scalar quantity? A. Force B. Velocity C. Acceleration D. Momentum Answer: B. Velocity 12. Which principle states that the total mechanical energy (kinetic plus potential) of an isolated system remains constant if only conservative forces act on it? A. Law of Conservation of Energy B. Principle of Relativity C. Principle of Equivalence D. Law of Inertia Answer: A. Law of Conservation of Energy 13. The kinetic energy of an object is given by: A. KE=12mv2KE = \frac{1}{2} mv^2KE=21​mv2 B. $KE=F\cdot d$ C. $KE=mv$ D. $KE=m\cdot a$ Answer: A. KE=12mv2KE = \frac{1}{2} mv^2KE=21​mv2 14. The potential energy of an object in a gravitational field near the Earth’s surface is: A. $PE=mgh$ B. PE=12mv2PE = \frac{1}{2} mv^2PE=21​mv2 C. PE=12kx2PE = \frac{1}{2} kx^2PE=21​kx2 D. $PE=F\cdot d$ Answer: A. $PE=mgh$ 15. Which of the following statements is true regarding projectile motion? A. Horizontal and vertical components of motion are independent of each other. B. The horizontal component of velocity changes due to gravitational force. C. The projectile moves with constant horizontal acceleration. D. None of the above Answer: A. Horizontal and vertical components of motion are independent of each other. 16. Which of Newton’s laws of motion deals with the concept of inertia? A. First law B. Second law C. Third law D. None of the above Answer: A. First law 17. Which of the following is a correct statement about circular motion? A. Centripetal force acts radially outward from the center of the circle. B. Centripetal acceleration is directed towards the center of the circle. C. Centrifugal force is a real force acting outward in circular motion. D. None of the above Answer: B. Centripetal acceleration is directed towards the center of the circle. 18. Which of the following quantities is conserved in elastic collisions? A. Momentum B. Kinetic energy C. Potential energy D. None of the above Answer: A. Momentum 19. A body floats on the surface of a liquid. Which principle explains this phenomenon? A. Archimedes’ Principle B. Bernoulli’s Principle C. Pascal’s Principle D. None of the above Answer: A. Archimedes’ Principle 20. Which of the following correctly describes the concept of torque? A. Torque is a measure of the rotational motion of an object. B. Torque is the product of force and velocity. C. Torque is a measure of an object’s translational motion. D. None of the above Answer: A. Torque is a measure of the rotational motion of an object. 21. Which of the following statements about Newton’s Third Law of Motion is correct? A. It states that for every action there is a reaction of equal magnitude but opposite direction. B. It states that an object will remain at rest or in uniform motion unless acted upon by an external force. C. It states that force is equal to mass times acceleration. D. None of the above Answer: A. It states that for every action there is a reaction of equal magnitude but opposite direction. 22. Which of the following is NOT a unit of force in the SI system? A. Newton B. Joule C. Dyne D. None of the above Answer: B. Joule 23. Which of the following is an example of a non-conservative force? A. Gravity B. Spring force C. Friction D. None of the above Answer: C. Friction 24. Which of the following equations represents Newton’s Second Law of Motion? A. $F=ma$ B. F=mv2rF = \frac{mv^2}{r}F=rmv2​ C. F=mvtF = \frac{mv}{t}F=tmv​ D. None of the above Answer: A. $F=ma$ 25. Which principle states that energy cannot be created or destroyed, only transformed from one form to another? A. Law of Gravitation B. Law of Conservation of Energy C. Law of Inertia D. None of the above Answer: B. Law of Conservation of Energy 26. Which of the following is a scalar quantity? A. Velocity B. Force C. Acceleration D. Momentum Answer: A. Velocity 27. Which of the following is a measure of an object’s resistance to change its state of motion? A. Acceleration B. Momentum C. Inertia D. Force Answer: C. Inertia 28. Which of the following is NOT a type of equilibrium in mechanics? A. Stable equilibrium B. Unstable equilibrium C. Neutral equilibrium D. Dynamic equilibrium Answer: D. Dynamic equilibrium 29. Which of the following statements correctly describes the concept of impulse? A. Impulse is the change in momentum of an object over time. B. Impulse is the force acting on an object over time. C. Impulse is the work done by a force on an object. D. None of the above Answer: A. Impulse is the change in momentum of an object over time. 30. Which of the following statements is true about circular motion? A. Centripetal force acts outward from the center of the circle. B. Centripetal acceleration is directed away from the center of the circle. C. Centrifugal force is a real force acting outward in circular motion. D. None of the above Answer: C. Centrifugal force is a real force acting outward in circular motion. 31. Which law of motion is mathematically represented as F=dpdtF = \frac{dp}{dt}F=dtdp​, where $p$ is momentum and $t$ is time? A. Newton’s First Law B. Newton’s Second Law C. Newton’s Third Law D. None of the above Answer: B. Newton’s Second Law 32. Which of the following is a conservative force? A. Friction B. Tension in a string C. Air resistance D. None of the above Answer: B. Tension in a string 33. Which of the following statements is true about work done by a force? A. It depends on the path taken by the object. B. It is a scalar quantity. C. It can be negative if the force is in the direction opposite to the displacement. D. All of the above Answer: D. All of the above 34. Which principle explains why a boat floats on water? A. Archimedes’ Principle B. Pascal’s Principle C. Bernoulli’s Principle D. None of the above Answer: A. Archimedes’ Principle 35. What is the SI unit of torque? A. Joule B. Newton-meter C. Watt D. Pascal Answer: B. Newton-meter 36. Which of the following is a measure of rotational inertia of an object? A. Torque B. Moment of inertia C. Impulse D. None of the above Answer: B. Moment of inertia 37. Which quantity is defined as the rate of change of angular displacement? A. Angular velocity B. Angular acceleration C. Angular momentum D. None of the above Answer: B. Angular acceleration 38. Which of the following statements about angular momentum is correct? A. It is a vector quantity. B. It is conserved in the absence of external torques. C. Both A and B D. None of the above Answer: C. Both A and B 39. Which of Newton’s laws of motion deals with the concept of action and reaction forces? A. First law B. Second law C. Third law D. None of the above Answer: C. Third law 40. Which type of equilibrium is described as when a small displacement results in a restoring force that returns the system to its original position? A. Stable equilibrium B. Unstable equilibrium C. Neutral equilibrium D. None of the above Answer: A. Stable equilibrium 41. Which of the following correctly describes the principle of conservation of energy? A. Energy cannot be created or destroyed, only transformed from one form to another. B. Energy is always conserved in any physical process. C. Both A and B D. None of the above Answer: C. Both A and B 42. Which quantity is defined as the work done per unit time? A. Power B. Energy C. Force D. Momentum Answer: A. Power 43. Which of the following statements about projectile motion is correct? A. The horizontal component of velocity changes due to gravitational force. B. The projectile moves with constant horizontal acceleration. C. Horizontal and vertical components of motion are independent of each other. D. None of the above Answer: C. Horizontal and vertical components of motion are independent of each other. 44. Which of the following quantities is conserved in perfectly elastic collisions? A. Kinetic energy B. Momentum C. Potential energy D. None of the above Answer: B. Momentum 45. Which of the following statements is true about the work-energy theorem? A. It states that work done by all forces on an object is equal to the change in its kinetic energy. B. It states that work done by a conservative force is zero. C. Both A and B D. None of the above Answer: A. It states that work done by all forces on an object is equal to the change in its kinetic energy. 46. Which law of motion is often summarized as $F=ma$? A. Newton’s First Law B. Newton’s Second Law C. Newton’s Third Law D. None of the above Answer: B. Newton’s Second Law 47. Which of the following correctly describes torque? A. Torque is a measure of rotational motion. B. Torque is the product of force and time. C. Torque is a scalar quantity. D. None of the above Answer: A. Torque is a measure of rotational motion. 48. Which of the following statements about friction is correct? A. Friction always opposes the motion of an object. B. Frictional force is independent of the nature of surfaces in contact. C. Both A and B D. None of the above Answer: A. Friction always opposes the motion of an object. 49. Which of the following is a measure of an object’s resistance to changes in rotational motion? A. Torque B. Moment of inertia C. Impulse D. None of the above Answer: B. Moment of inertia

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