Q1. Newton’s First Law of Motion is also called —
a) Law of momentum
b) Law of inertia
c) Law of force
d) Law of acceleration
✅ Answer: b) Law of inertia
Explanation: It states a body remains at rest or uniform motion unless acted upon by an external force.
Q2. Which physical quantity is the rate of change of displacement?
a) Acceleration
b) Speed
c) Velocity
d) Force
✅ Answer: c) Velocity
Explanation: Velocity = change of displacement per unit time.
Q3. The slope of a velocity–time graph gives —
a) Displacement
b) Speed
c) Acceleration
d) Force
✅ Answer: c) Acceleration
Explanation: Slope = Δv / Δt.
Q4. A car travels 120 km in 2 hours. Its average speed is —
a) 30 km/h
b) 40 km/h
c) 50 km/h
d) 60 km/h
✅ Answer: d) 60 km/h
Explanation: .
Q5. Which of the following is not a scalar quantity?
a) Mass
b) Work
c) Displacement
d) Temperature
✅ Answer: c) Displacement
Explanation: Displacement has both magnitude and direction → vector.
Q6. A body of mass 5 kg is moving with velocity 2 m/s. Its momentum is —
a) 5 kg·m/s
b) 10 kg·m/s
c) 15 kg·m/s
d) 20 kg·m/s
✅ Answer: b) 10 kg·m/s
Explanation: p – mv – 5×2 – 10
Q7. A 1 kg mass is lifted vertically upward through 5 m. Work done is —
a) 5 J
b) 10 J
c) 25 J
d) 50 J
✅ Answer: d) 50 J
Explanation: Work = mgh — 1×10×5 — 50 J
Q8. A car of mass 1000 kg moves at 36 km/h. Its kinetic energy is —
a) 25 kJ
b) 50 kJ
c) 100 kJ
d) 200 kJ
✅ Answer: b) 50 kJ
Explanation: .
KE
Q9. Which of the following is a vector quantity?
a) Speed
b) Work
c) Power
d) Acceleration
✅ Answer: d) Acceleration
Explanation: Speed, work, power = scalars. Acceleration has direction.
Q10. The velocity–time graph of a particle is a straight line parallel to the time axis. The motion is —
a) Uniform acceleration
b) Uniform retardation
c) Uniform velocity
d) Variable acceleration
✅ Answer: c) Uniform velocity
Explanation: Horizontal line = velocity constant.
Q11. The area under a velocity–time graph represents —
a) Acceleration
b) Force
c) Displacement
d) Work
✅ Answer: c) Displacement
Explanation: Area under v–t curve = total displacement.
Q12. A body thrown vertically upward has zero velocity at the highest point because —
a) Force is zero
b) Acceleration is zero
c) Kinetic energy is maximum
d) Instantaneous velocity is zero
✅ Answer: d) Instantaneous velocity is zero
Explanation: At the top, velocity momentarily becomes zero though acceleration = g downward.
Q13. A projectile has maximum range when angle of projection is —
a) 30°
b) 45°
c) 60°
d) 90°
✅ Answer: b) 45°
Q14. Which law explains the recoil of a gun?
a) Newton’s 1st law
b) Newton’s 2nd law
c) Newton’s 3rd law
d) Law of gravitation
✅ Answer: c) Newton’s 3rd law
Explanation: Gun exerts force on bullet → bullet exerts equal opposite force → recoil.
Q15. The unit of power is —
a) Joule
b) Watt
c) Newton
d) Pascal
✅ Answer: b) Watt
Explanation: Power = Work/time = Joule per second = Watt.
Q16. A body of mass 10 kg is accelerated at 2 m/s². The force applied is —
a) 5 N
b) 10 N
c) 15 N
d) 20 N
✅ Answer: d) 20 N
Explanation:
Q17. If no external force acts on a system, the quantity conserved is —
a) Energy
b) Acceleration
c) Momentum
d) Work
✅ Answer: c) Momentum
Explanation: Law of conservation of linear momentum.
Q18. Centripetal force always acts —
a) Along tangent
b) Away from center
c) Towards center
d) Perpendicular to radius
✅ Answer: c) Towards center
Explanation: Needed to keep body in circular motion.
Q19. Which of the following has the least friction?
a) Sliding
b) Rolling
c) Static
d) Limiting
✅ Answer: b) Rolling
Explanation: Rolling friction ≪ sliding friction.
Q20. Work done in moving a body on a frictionless horizontal surface is —
a) Zero
b) mgh
c) F × d
d) ½mv²
✅ Answer: c) F × d
Explanation: Work = Force × displacement (if force is along displacement).
Q21. The slope of a displacement–time graph represents —
a) Displacement
b) Velocity
c) Acceleration
d) Force
✅ Answer: b) Velocity
Explanation: Gradient of s–t graph = velocity.
Q22. A body moves 4 m east and then 3 m north. Its displacement is —
a) 7 m
b) 5 m
c) 1 m
d) 12 m
✅ Answer: b) 5 m
Q23. The condition for equilibrium of a body is —
a) ΣF = 0 only
b) Στ = 0 only
c) ΣF = 0 and Στ = 0
d) Momentum constant
✅ Answer: c) ΣF = 0 and Στ = 0
Explanation: Translational & rotational equilibrium.
Q24. Which of these is a vector quantity?
a) Work
b) Energy
c) Power
d) Momentum
✅ Answer: d) Momentum
Explanation: Momentum = mass × velocity (vector).
Q25. Kinetic energy depends on —
a) Only mass
b) Only velocity
c) Both mass and velocity
d) Neither
✅ Answer: c) Both mass and velocity
Explanation: KE — ½ mv²
Q26. A body is said to be weightless when —
a) In air
b) In vacuum
c) In free fall
d) In water
✅ Answer: c) In free fall
Explanation: Apparent weight = 0 in free fall.
Q27. The moment of inertia of a body depends on —
a) Mass only
b) Axis of rotation
c) Shape & distribution of mass
d) Both b and c
✅ Answer: d) Both b and c
Explanation: I = Σmr² depends on distribution & axis.
Q28. The unit of angular momentum is —
a) N·m
b) kg·m/s
c) kg·m²/s
d) J
✅ Answer: c) kg·m²/s
Explanation: L- Iω – mvr
Q29. The acceleration of a body sliding down a smooth inclined plane of angle θ is —
a) g
b) g cosθ
c) g sinθ
d) zero
✅ Answer: c) g sinθ
Explanation: Component of g along incline.
Q30. Work done in uniform circular motion is —
a) Maximum
b) Zero
c) Constant
d) Infinite
✅ Answer: b) Zero
Explanation: Force ⟂ displacement always.
Q31. Escape velocity on Earth is about —
a) 2.2 km/s
b) 7.9 km/s
c) 11.2 km/s
d) 12.8 km/s
✅ Answer: c) 11.2 km/s
Q32. Newton’s law of gravitation is —
a) Inverse square law
b) Inverse law
c) Direct law
d) None
✅ Answer: a) Inverse square law
Explanation: F∝1 / r²
Q33. Potential energy at infinity is taken as —
a) Zero
b) Infinite
c) Negative
d) Positive
✅ Answer: a) Zero
Explanation: Convention for gravitational PE.
Q34. The dimensional formula of force is —
a) [MLT⁻²]
b) [ML²T⁻²]
c) [ML⁻¹T⁻²]
d) [M¹L¹T¹]
✅ Answer: a) [MLT⁻²]
Q35. The SI unit of impulse is —
a) N
b) N·s
c) J
d) W
✅ Answer: b) N·s
Explanation: Impulse = Force × time = change in momentum.
Q36. The efficiency of an ideal machine is —
a) Zero
b) 50%
c) 100%
d) <100%
✅ Answer: c) 100%
Q37. If two equal forces act at 90°, their resultant is —
a) F
b) √2F
c) 2F
d) Zero
✅ Answer: b) √2F
Q38. A geostationary satellite has a time period of —
a) 12 h
b) 24 h
c) 6 h
d) 48 h
✅ Answer: b) 24 h
Q39. Centre of mass of a uniform ring is —
a) On circumference
b) At center of ring
c) On axis
d) Outside ring
✅ Answer: b) At center of ring
Q40. Which of these is not a scalar quantity?
a) Pressure
b) Work
c) Energy
d) Torque
✅ Answer: d) Torque
Explanation: Torque is a vector (axial).
Q41. If a car moves with uniform speed in a circle, which is true?
a) Velocity is constant
b) Acceleration is zero
c) Speed is constant
d) Force is zero
✅ Answer: c) Speed is constant
Q42. For a freely falling body, velocity after time t is —
a) u + gt
b) u – gt
c) ut
d) gt²/2
✅ Answer: a) u + gt
Q43. Inelastic collision is one in which —
a) Momentum not conserved
b) Kinetic energy not conserved
c) Both conserved
d) Energy created
✅ Answer: b) Kinetic energy not conserved
Q44. A simple machine gives —
a) Work gain
b) Energy gain
c) Force gain
d) Efficiency > 1
✅ Answer: c) Force gain
Q45. The path of a projectile is —
a) Circle
b) Ellipse
c) Parabola
d) Hyperbola
✅ Answer: c) Parabola
Q46. Dimension of pressure is —
a) [ML⁻¹T⁻²]
b) [ML²T⁻²]
c) [M¹L¹T⁻²]
d) [MLT⁻²]
✅ Answer: a) [ML⁻¹T⁻²]
Q47. Work done in stretching a spring is stored as —
a) Kinetic energy
b) Potential energy
c) Rotational energy
d) Power
✅ Answer: b) Potential energy
Q48. Two equal and opposite forces separated by distance form —
a) Torque
b) Couple
c) Stress
d) Pressure
✅ Answer: b) Couple
Q49. If velocity is doubled, kinetic energy becomes —
a) 2 times
b) 4 times
c) 8 times
d) 16 times
✅ Answer: b) 4 times
Q50. The unit of gravitational constant G is —
a) N·m²/kg²
b) N·m²/s²
c) N·kg²/m²
d) m²/s²
✅ Answer: a) N·m²/kg²