📘 Chapter 8 – Measurement of Time and Motion

🔹 Part 4: Mixed Conceptual + Revision Questions (Q76–Q100)

Q76. Which of the following is NOT a periodic motion?

A) Swinging pendulum
B) Earth’s rotation
C) Beating of heart
D) A car moving on a straight road

✅ Answer: D) A car moving on a straight road

Q77. Which of the following motions is both periodic and oscillatory?

A) Rotation of Earth
B) Swing of a pendulum
C) Motion of a car
D) Rolling of a ball

✅ Answer: B) Swing of a pendulum

Q78. The device used to measure very short intervals of time is:

A) Sundial
B) Stopwatch
C) Atomic clock
D) Pendulum

✅ Answer: B) Stopwatch

Q79. Which is the most accurate clock in the world?

A) Pendulum clock
B) Sundial
C) Atomic clock
D) Digital wristwatch

✅ Answer: C) Atomic clock

Q80. Which of these has uniform motion?

A) Car on a busy road
B) Train on straight track with constant speed
C) Swinging pendulum
D) Child running in playground

✅ Answer: B) Train on straight track with constant speed

Q81. Which of the following is an example of oscillatory motion?

A) Rotation of fan blades
B) Motion of swing
C) Earth revolving around Sun
D) Motion of car

✅ Answer: B) Motion of swing

Q82. If a car moves at 72 km/h, its speed in m/s is:

A) 15 m/s
B) 18 m/s
C) 20 m/s
D) 25 m/s

✅ Answer: C) 20 m/s

Q83. A pendulum makes 20 oscillations in 40 seconds. Time period = ?

A) 1 s
B) 2 s
C) 4 s
D) 0.5 s

✅ Answer: B) 2 s

(40 ÷ 20 = 2 s)

Q84. Which of these is used in vehicles to measure distance?

A) Speedometer
B) Odometer
C) Stopwatch
D) Pendulum

✅ Answer: B) Odometer

Q85. A runner covers 180 m in 15 s. Speed = ?

A) 10 m/s
B) 11 m/s
C) 12 m/s
D) 15 m/s

✅ Answer: C) 12 m/s

(180 ÷ 15 = 12 m/s)

Q86. Which factor affects speed?

A) Distance only
B) Time only
C) Both distance and time
D) None

✅ Answer: C) Both distance and time

Q87. If speed is constant, which relation is true?

A) Distance ∝ Time
B) Time ∝ Distance
C) Distance ÷ Time = Constant
D) All of these

✅ Answer: D) All of these

Q88. A car covers 60 km in 1 hour, then 40 km in 1 hour. Its average speed = ?

A) 40 km/h
B) 45 km/h
C) 50 km/h
D) 60 km/h

✅ Answer: B) 50 km/h

(Total distance = 100 km; Total time = 2 h; Avg speed = 100 ÷ 2 = 50 km/h)

Q89. Which type of motion does the Earth show around its axis?

A) Rectilinear
B) Rotational
C) Oscillatory
D) Random

✅ Answer: B) Rotational

Q90. Which of these motions is periodic?

A) Growth of plants
B) Swing of pendulum
C) Movement of car
D) Rolling ball

✅ Answer: B) Swing of pendulum

Q91. The SI unit of distance is:

A) cm
B) m
C) km
D) mm

✅ Answer: B) m

Q92. The SI unit of speed is:

A) km/h
B) m/s
C) cm/s
D) km/min

✅ Answer: B) m/s

Q93. A cycle moves at 10 m/s for 30 seconds. Distance covered = ?

A) 100 m
B) 200 m
C) 300 m
D) 400 m

✅ Answer: C) 300 m

(10 × 30 = 300 m)

Q94. If distance is constant, increasing speed will:

A) Increase time
B) Decrease time
C) Not affect time
D) Increase distance

✅ Answer: B) Decrease time

Q95. In which case will displacement be zero?

A) Car moves 5 km forward
B) Car moves 10 km and returns to start
C) Train moves 100 km
D) Person walks in a straight line

✅ Answer: B) Car moves 10 km and returns to start

Q96. A student walks 100 m in 50 s. His speed = ?

A) 1 m/s
B) 2 m/s
C) 3 m/s
D) 4 m/s

✅ Answer: B) 2 m/s

Q97. Motion of a ceiling fan is:

A) Circular
B) Oscillatory
C) Rectilinear
D) Random

✅ Answer: A) Circular

Q98. The speed of an object can never be:

A) Positive
B) Zero
C) Negative
D) Measured

✅ Answer: C) Negative

Q99. A train covers 90 km in 1.5 hours. Its average speed is:

A) 40 km/h
B) 50 km/h
C) 60 km/h
D) 70 km/h

✅ Answer: C) 60 km/h

Q100. The relation between speed, distance, and time is:

A) Speed = Distance ÷ Time
B) Distance = Speed ÷ Time
C) Time = Speed × Distance
D) Distance = Speed ÷ Time

✅ Answer: A) Speed = Distance ÷ Time

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