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Physics CBSE Live product
Class 7 (2025-26)
Measurement of time and motion
Revision I - Measurement of time and motion
9.
Fundamental units of time
Question:
6
m.
Select the correct answer:
1
.
Second
-
It is a larger unit of time used mainly for long journeys
It is the time between two sunrises
It is equal to \(60\) hours and used in calendars
It is the SI unit of time and is written with the symbol \(s\)
2
.
Day
-
It is equal to \(12\) hours and occurs twice in \(24\) hours
It is the time between two new moons
It is the time interval between two consecutive sunrises
It is the time taken by the Earth to complete one revolution around the Sun
3
.
Year
-
It is equal to \(30\) days and used in calendars
It is the time taken by the Moon to revolve around the Earth
It is the time taken by the Earth to complete one revolution around the Sun
It is equal to exactly \(360\) days in all cases
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