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Physics CBSE Live product
Class 7 (2026-27)
Measurement of time and motion
Introduction to measurement of time
1.
Measurement of time
Question:
2
m.
Choose the correct answer:
1.
Which ancient device measures time using the shadow of an object?
Sundial
Hourglass
Stopwatch
Water clock
2.
Which statement correctly explains why a stopwatch is used in sports competitions?
It can measure very short intervals of time accurately.
It uses flowing water to calculate time.
It works only in sunlight.
It measures the speed of runners directly.
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