Question

Tick the most appropriate answer.
Which of the following is not a common unit for measuring time ?

Answer 1

Correct option is D. Sundial
Sundial is a device that uses the shadow cast by a stick placed in sunshine to know the time of the day. It is not a measuring unit of time. It is just a type of clock which tells us the time but is not the unit to measure it.
Hence the correct answer is Option (D), Sundial.