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Physics CBSE Live product
Class 7 (2026-27)
Measurement of time and motion
Introduction to measurement of time
6.
Sundial vs water clock
Question:
4
m.
Complete the following table:
Feature
Sundial
Water clock
Principle used
Electrical pulses
Changing position of a shadow
Flow of water
Flow of sand
Flow of sand
Flow/movement of water
Changing position of a shadow
Movement of gears
Can it work at night?
Yes
No
Maybe
Can't predict
Yes
No
Maybe
Can't predict
One Major Limitation
Requires sunlight
Requires water
Sand may spill
Candle may melt
Requires sunlight
Early types had changing flow rate
Sand may stop
Shadow changes position
Indian example
Hourglass
Candle clock
Ghatika-yantra
Samrat Yantra
Samrat Yantra
Ghatika-yantra
Candle clock
Hourglass
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