1. Dynamics is the branch of physics that deals with: A) Light
B) Motion and forces
C) Heat
D) Sound
Answer: B) Motion and forces
Q2. Which law of motion was proposed by Newton first? A) Law of Gravitation
B) First Law of Motion
C) Third Law of Motion
D) Second Law of Motion
Answer: B) First Law of Motion
Q3. Newton’s first law is also known as: A) Law of Gravitation
B) Law of Inertia
C) Law of Acceleration
D) Law of Momentum
Answer: B) Law of Inertia
Q4. The SI unit of force is: A) Joule
B) Newton
C) Watt
D) Pascal
Answer: B) Newton
Q5. One Newton is equal to: A) 1 kg m/s
B) 1 kg m/s²
C) 1 kg²/s²
D) 1 m/s²
Answer: B) 1 kg m/s²
Q6. Inertia depends upon: A) Velocity
B) Acceleration
C) Mass
D) Force
Answer: C) Mass
Q7. Which quantity measures inertia? A) Velocity
B) Momentum
C) Mass
D) Force
Answer: C) Mass
Q8. The tendency of a body to resist changes in its state of rest or motion is called: A) Momentum
B) Inertia
C) Acceleration
D) Weight
Answer: B) Inertia
Q9. Newton’s second law relates force with: A) Velocity
B) Mass and acceleration
C) Distance
D) Time
Answer: B) Mass and acceleration
Q10. Formula of force is: A) F = ma
B) F = mv
C) F = mg
D) F = m/v
Answer: A) F = ma
Q11. A force of 20 N acts on a body of mass 5 kg. The acceleration produced is: A) 2 m/s²
B) 3 m/s²
C) 4 m/s²
D) 5 m/s²
Answer: C) 4 m/s²
Q12. A body of mass 10 kg accelerates at 3 m/s². Find force. A) 20 N
B) 30 N
C) 40 N
D) 50 N
Answer: B) 30 N
Q13. Newton’s third law states that: A) Force equals mass × acceleration
B) Every action has equal and opposite reaction
C) Inertia depends on mass
D) Force causes velocity
Answer: B) Every action has equal and opposite reaction
Q14. Rocket propulsion is based on: A) First law
B) Second law
C) Third law
D) Gravitation
Answer: C) Third law
Q15. The product of mass and velocity is called:
A) Force
B) Momentum
C) Weight
D) Work
Answer: B) Momentum
Q16. SI unit of momentum is: A) N/m
B) kg m/s
C) kg/m²
D) Joule
Answer: B) kg m/s
Q17. Formula for momentum is: A) p = ma
B) p = mv
C) p = mg
D) p = Fv
Answer: B) p = mv
Q18. A body of mass 4 kg moving with velocity 5 m/s has momentum: A) 10 kg m/s
B) 15 kg m/s
C) 20 kg m/s
D) 25 kg m/s
Answer: C) 20 kg m/s
Q19. The rate of change of momentum is equal to: A) Velocity
B) Mass
C) Force
D) Work
Answer: C) Force
Q20. Weight is equal to:
A) mv
B) ma
C) mg
D) m/g
Answer: C) mg
Q21. A body of mass 8 kg has weight approximately equal to: A) 60 N
B) 78.4 N
C) 80 N
D) 90 N
Answer: B) 78.4 N
Q22. Value of g on Earth is nearly: A) 5.8 m/s²
B) 8.9 m/s²
C) 9.8 m/s²
D) 10.8 m/s²
Answer: C) 9.8 m/s²
Q23. Which quantity is a vector? A) Mass
B) Time
C) Force
D) Distance
Answer: C) Force
Q24. Balanced forces produce: A) Acceleration
B) Motion only
C) No acceleration
D) Velocity change
Answer: C) No acceleration
Q25. Unbalanced forces cause: A) Rest only
B) Change in motion
C) No effect
D) Constant mass
Answer: B) Change in motion
Q26. Friction is a force that: A) Assists motion
B) Opposes motion
C) Produces light
D) Produces sound
Answer: B) Opposes motion
Q27. Unit of mass is: A) Newton
B) Joule
C) Kilogram
D) Watt
Answer: C) Kilogram
Q28. Which is not a force? A) Friction
B) Weight
C) Momentum
D) Tension
Answer: C) Momentum
Q29. Action and reaction forces act on: A) Same body
B) Different bodies
C) Same point only
D) Same direction
Answer: B) Different bodies
Q30. Seat belts in cars work on the principle of: A) Momentum
B) Inertia
C) Weight
D) Gravitation
Answer: B) Inertia
Q31. The SI unit of weight is: A) kg
B) Newton
C) Joule
D) Watt
Answer: B) Newton
Q32. A body of mass 6 kg experiences an acceleration of 2 m/s². Force is: A) 6 N
B) 8 N
C) 10 N
D) 12 N
Answer: D) 12 N
Q33. If force doubles and mass remains constant, acceleration becomes: A) Half
B) Double
C) One-fourth
D) Zero
Answer: B) Double
Q34. If mass doubles and force remains constant, acceleration becomes: A) Double
B) Half
C) Same
D) Four times
Answer: B) Half
Q35. Which quantity is scalar? A) Force
B) Weight
C) Momentum
D) Mass
Answer: D) Mass
Q36. The force exerted by Earth on a body is called: A) Momentum
B) Tension
C) Weight
D) Friction
Answer: C) Weight
Q37. A body of mass 2 kg moving at 10 m/s has momentum: A) 10 kg m/s
B) 15 kg m/s
C) 20 kg m/s
D) 25 kg m/s
Answer: C) 20 kg m/s
Q38. Which law explains recoil of a gun? A) First law
B) Second law
C) Third law
D) Gravitation
Answer: C) Third law
Q39. A horse pulling a cart is an example of: A) First law only
B) Second law only
C) Third law
D) Gravitation
Answer: C) Third law
Q40. The unit kg m/s² is equivalent to: A) Joule
B) Newton
C) Watt
D) Pascal
Answer: B) Newton
Q41. If a body has zero acceleration, the net force acting on it is: A) Infinite
B) One Newton
C) Zero
D) Variable
Answer: C) Zero
Q42. Momentum depends upon: A) Mass and velocity
B) Mass only
C) Velocity only
D) Acceleration only
Answer: A) Mass and velocity
Q43. Which quantity changes when velocity changes? A) Mass
B) Momentum
C) Density
D) Volume
Answer: B) Momentum
Q44. The force required to accelerate a 4 kg body at 5 m/s² is: A) 10 N
B) 15 N
C) 20 N
D) 25 N
Answer: C) 20 N
Q45. A 50 N force acts on a 10 kg body. Acceleration is: A) 2 m/s²
B) 5 m/s²
C) 10 m/s²
D) 20 m/s²
Answer: B) 5 m/s²
Q46. The heavier the body, the greater its: A) Velocity
B) Inertia
C) Force
D) Work
Answer: B) Inertia
Q47. Which law is also called the law of conservation of momentum? A) First law
B) Second law
C) Third law
D) Universal law of gravitation
Answer: C) Third law
Q48. A body at rest remains at rest unless acted upon by: A) Balanced force
B) External unbalanced force
C) Gravity only
D) Friction only
Answer: B) External unbalanced force
Q49. The direction of acceleration is always the same as the direction of: A) Mass
B) Velocity
C) Net Force
D) Momentum
Answer: C) Net Force
Q50. A body of mass 3 kg has weight approximately equal to: A) 19.4 N
B) 29.4 N
C) 39.4 N
D) 49.4 N
Answer: B) 29.4 N
51. The SI unit of acceleration is: A) m/s
B) m/s²
C) N
D) kg m/s
Answer: B) m/s²
Q52. Which quantity has both magnitude and direction? A) Speed
B) Distance
C) Force
D) Mass
Answer: C) Force
Q53. If no external force acts on a moving body, it will: A) Stop immediately
B) Accelerate
C) Continue with uniform velocity
D) Move in a circle
Answer: C) Continue with uniform velocity
Q54. The effect of force on a body depends upon: A) Color
B) Mass and acceleration
C) Shape only
D) Temperature
Answer: B) Mass and acceleration
Q55. A body of mass 5 kg has weight approximately equal to: A) 39.2 N
B) 49 N
C) 58.8 N
D) 98 N
Answer: B) 49 N
Q56. A force of 60 N acts on a 15 kg body. Find acceleration. A) 2 m/s²
B) 3 m/s²
C) 4 m/s²
D) 5 m/s²
Answer: C) 4 m/s²
Q57. Which law explains why passengers fall forward when a bus stops suddenly? A) Newton’s First Law
B) Newton’s Second Law
C) Newton’s Third Law
D) Law of Gravitation
Answer: A) Newton’s First Law
Q58. A body of mass 2 kg accelerates at 6 m/s². The force applied is: A) 8 N
B) 10 N
C) 12 N
D) 14 N
Answer: C) 12 N
Q59. Momentum is a: A) Scalar quantity
B) Vector quantity
C) Dimensionless quantity
D) Constant quantity
Answer: B) Vector quantity
Q60. Which of the following has the greatest inertia? A) 2 kg body
B) 5 kg body
C) 10 kg body
D) 20 kg body
Answer: D) 20 kg body
Q61. Which force opposes the motion of a body? A) Gravitational force
B) Frictional force
C) Magnetic force
D) Electrostatic force
Answer: B) Frictional force
Q62. The unit of momentum is: A) kg m/s
B) N/m²
C) J
D) W
Answer: A) kg m/s
Q63. The acceleration produced by a force of 100 N on a 25 kg body is: A) 2 m/s²
B) 3 m/s²
C) 4 m/s²
D) 5 m/s²
Answer: C) 4 m/s²
Q64. Action and reaction forces are always: A) Equal and opposite
B) Equal and same direction
C) Unequal
D) Parallel only
Answer: A) Equal and opposite
Q65. The force required to accelerate a 7 kg body at 2 m/s² is: A) 7 N
B) 10 N
C) 12 N
D) 14 N
Answer: D) 14 N
Q66. Which quantity remains constant if no external force acts? A) Momentum
B) Weight
C) Acceleration
D) Density
Answer: A) Momentum
Q67. The tendency of a moving object to continue moving is due to: A) Weight
B) Inertia
C) Friction
D) Gravity
Answer: B) Inertia
Q68. Which force keeps planets in orbit around the Sun? A) Frictional force
B) Tension force
C) Gravitational force
D) Magnetic force
Answer: C) Gravitational force
Q69. A body of mass 12 kg has weight equal to: A) 98 N
B) 117.6 N
C) 120 N
D) 140 N
Answer: B) 117.6 N
Q70. Which law of motion defines force? A) First law
B) Second law
C) Third law
D) Law of gravitation
Answer: B) Second law
Q71. If acceleration is zero, velocity is: A) Constant
B) Infinite
C) Zero
D) Negative
Answer: A) Constant
Q72. Which quantity is directly proportional to momentum? A) Velocity
B) Mass
C) Both mass and velocity
D) Time
Answer: C) Both mass and velocity
Q73. A body moving with velocity 8 m/s and mass 5 kg has momentum: A) 20 kg m/s
B) 30 kg m/s
C) 40 kg m/s
D) 50 kg m/s
Answer: C) 40 kg m/s
Q74. Inertia of motion causes passengers to: A) Fall backward when a bus starts suddenly
B) Fall forward when a bus starts suddenly
C) Fall upward
D) Remain unaffected
Answer: A) Fall backward when a bus starts suddenly
Q75. Which law explains swimming? A) First law
B) Second law
C) Third law
D) Gravitation law
Answer: C) Third law
Q76. Force is equal to: A) Momentum × Time
B) Mass × Acceleration
C) Mass × Velocity
D) Weight × Height
Answer: B) Mass × Acceleration
Q77. Which quantity changes due to force? A) State of motion
B) Mass
C) Density
D) Temperature
Answer: A) State of motion
Q78. The mass of an object on the Moon is: A) Zero
B) Greater than on Earth
C) Less than on Earth
D) Same as on Earth
Answer: D) Same as on Earth
Q79. Weight is a: A) Scalar quantity
B) Vector quantity
C) Dimensionless quantity
D) Constant quantity
Answer: B) Vector quantity
Q80. A force of 45 N acts on a body of mass 9 kg. The acceleration is: A) 3 m/s²
B) 4 m/s²
C) 5 m/s²
D) 6 m/s²
Answer: C) 5 m/s²
Q81. Which quantity is measured in Newton? A) Mass
B) Velocity
C) Force
D) Momentum
Answer: C) Force
Q82. A body with greater mass has: A) Less inertia
B) More inertia
C) No inertia
D) Infinite inertia
Answer: B) More inertia
Q83. Which force acts vertically downward on a body? A) Frictional force
B) Tension force
C) Weight
D) Magnetic force
Answer: C) Weight
Q84. The acceleration produced by 30 N force on a 10 kg mass is: A) 2 m/s²
B) 3 m/s²
C) 4 m/s²
D) 5 m/s²
Answer: B) 3 m/s²
Q85. Momentum of a stationary object is: A) Infinite
B) One
C) Zero
D) Negative
Answer: C) Zero
Q86. The unit of weight is: A) kg
B) Newton
C) Joule
D) Watt
Answer: B) Newton
Q87. Which law explains the working of jet engines? A) First law
B) Second law
C) Third law
D) Gravitation law
Answer: C) Third law
Q88. Which quantity does not depend on gravity? A) Weight
B) Force
C) Mass
D) Momentum
Answer: C) Mass
Q89. A 4 kg body moving with velocity 15 m/s has momentum: A) 40 kg m/s
B) 50 kg m/s
C) 60 kg m/s
D) 70 kg m/s
Answer: C) 60 kg m/s
Q90. The force acting on a body at rest with balanced forces is: A) 10 N
B) 5 N
C) Infinite
D) Zero
Answer: D) Zero
Q91. Which quantity is measured in kg? A) Weight
B) Force
C) Mass
D) Momentum
Answer: C) Mass
Q92. The force of gravity on the Moon is approximately: A) Equal to Earth
B) Half of Earth
C) One-sixth of Earth
D) Double of Earth
Answer: C) One-sixth of Earth
Q93. A body of mass 20 kg accelerated at 2 m/s² experiences force: A) 20 N
B) 30 N
C) 40 N
D) 50 N
Answer: C) 40 N
Q94. Which law is used to explain recoil of a rifle? A) First law
B) Second law
C) Third law
D) Gravitation law
Answer: C) Third law
Q95. A body with zero velocity possesses: A) Infinite momentum
B) Zero momentum
C) Maximum momentum
D) Constant momentum
Answer: B) Zero momentum
Q96. Which quantity is proportional to force for constant mass? A) Velocity
B) Acceleration
C) Time
D) Distance
Answer: B) Acceleration
Q97. The SI unit of inertia is: A) Newton
B) Joule
C) No specific unit (measured by mass)
D) Watt
Answer: C) No specific unit (measured by mass)
Q98. If force becomes three times while mass remains constant, acceleration becomes: A) Half
B) Same
C) Triple
D) One-third
Answer: C) Triple
Q99. Which law is the basis of momentum conservation? A) First law
B) Second law
C) Third law
D) Law of inertia
Answer: C) Third law
Q100. Dynamics is mainly concerned with: A) Causes of motion and changes in motion
B) Heat transfer
C) Reflection of light
D) Sound waves
Answer: A) Causes of motion and changes in motion