Measurement of Time and Motion Part 2: MCQs (Q26–Q50)
📘 Chapter 8 – Measurement of Time and Motion
🔹 Part 2: Measurement of Time & Speed (Q26–Q50)
Q26. The basic unit of time in SI system is:
A) Minute
B) Hour
C) Second
D) Millisecond
✅ Answer: C) Second
Explanation:
- (A) & (B) → Practical units, not SI base unit.
- (C) Second is the SI unit (Correct).
- (D) Millisecond = 1/1000 second, derived unit.
Q27. The device used in ancient times to measure time using shadows was:
A) Water clock
B) Sundial
C) Pendulum clock
D) Hourglass
✅ Answer: B) Sundial
Q28. Which instrument uses flowing sand to measure time?
A) Sundial
B) Hourglass
C) Pendulum
D) Digital watch
✅ Answer: B) Hourglass
Q29. Which of these is a modern instrument to measure time accurately?
A) Sundial
B) Atomic clock
C) Water clock
D) Candle clock
✅ Answer: B) Atomic clock
Q30. The SI unit of speed is:
A) m/s
B) km/h
C) cm/s
D) m/min
✅ Answer: A) m/s
Explanation: Derived unit of speed = distance (m) ÷ time (s).
Q31. Speed is defined as:
A) Distance × time
B) Distance ÷ time
C) Time ÷ distance
D) Force ÷ mass
✅ Answer: B) Distance ÷ time
Q32. A car travels 60 km in 2 hours. Its speed is:
A) 20 km/h
B) 30 km/h
C) 60 km/h
D) 120 km/h
✅ Answer: B) 30 km/h
Q33. A cycle covers 100 m in 20 seconds. Its speed is:
A) 5 m/s
B) 20 m/s
C) 50 m/s
D) 2 m/s
✅ Answer: A) 5 m/s
Q34. The distance covered in unit time is called:
A) Time
B) Speed
C) Velocity
D) Acceleration
✅ Answer: B) Speed
Q35. Which instrument is used in vehicles to show speed?
A) Stopwatch
B) Odometer
C) Speedometer
D) Tachometer
✅ Answer: C) Speedometer
Q36. The device in vehicles to measure distance travelled is:
A) Speedometer
B) Odometer
C) Stopwatch
D) Barometer
✅ Answer: B) Odometer
Q37. A simple pendulum is used for measuring:
A) Speed
B) Distance
C) Time
D) Acceleration
✅ Answer: C) Time
Q38. The time taken for one complete swing of a pendulum is called:
A) Frequency
B) Period
C) Oscillation
D) Amplitude
✅ Answer: B) Period
Q39. Which of the following is NOT a unit of speed?
A) m/s
B) km/h
C) cm/s
D) kg/m
✅ Answer: D) kg/m
Q40. Which of these is a slow motion?
A) A train
B) A rocket
C) Growth of plants
D) A car
✅ Answer: C) Growth of plants
Q41. Which of these is a fast motion?
A) A tortoise
B) A bicycle
C) A rocket
D) Growth of hair
✅ Answer: C) A rocket
Q42. The motion of a pendulum is used in which device?
A) Digital clock
B) Atomic clock
C) Old mechanical clocks
D) Stopwatch
✅ Answer: C) Old mechanical clocks
Q43. A bus travels 120 km in 4 hours. Its speed is:
A) 20 km/h
B) 30 km/h
C) 40 km/h
D) 60 km/h
✅ Answer: C) 40 km/h
Q44. A runner completes 100 m in 10 seconds. His speed is:
A) 5 m/s
B) 10 m/s
C) 20 m/s
D) 50 m/s
✅ Answer: B) 10 m/s
Q45. If the speed of a car is 36 km/h, its speed in m/s is:
A) 10 m/s
B) 12 m/s
C) 15 m/s
D) 20 m/s
✅ Answer: A) 10 m/s
(Conversion: km/h × (1000/3600) = m/s → 36 × 1000 ÷ 3600 = 10 m/s)
Q46. The time measuring device with highest accuracy is:
A) Pendulum clock
B) Digital watch
C) Atomic clock
D) Sand clock
✅ Answer: C) Atomic clock
Q47. Which of the following is used for very short time intervals in labs?
A) Odometer
B) Stopwatch
C) Pendulum
D) Atomic clock
✅ Answer: B) Stopwatch
Q48. If a car covers equal distances in equal intervals of time, its motion is:
A) Uniform
B) Non-uniform
C) Random
D) Oscillatory
✅ Answer: A) Uniform
Q49. Which type of motion is shown by a moving train when it changes speed?
A) Uniform motion
B) Non-uniform motion
C) Oscillatory motion
D) Periodic motion
✅ Answer: B) Non-uniform motion
Q50. The quantity used to compare how fast or slow an object moves is:
A) Speed
B) Distance
C) Time
D) Period
✅ Answer: A) Speed
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