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Q.

Which one of the following units was used in ancient time?


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a

Hour 

b

Solar day

c

lunar day

d

Seconds 

answer is B.

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Detailed Solution

A solar day is the most ancient unit of time.
In ancient times, even before the invention of sand clocks, water clocks, and sundials, the time period between two consecutive sunrises was used as the unit of time. Ancient peoples were unaware of any other kind of periodic motion that could have been used as a unit of time. So a solar day was the only unit they used as a unit of time.
 
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Which one of the following units was used in ancient time?