Question

Which among the following is/are used as time measuring device(s) in ancient time?
(This question may have multiple correct options.)
(A) Incense clock
(B) Digital watch
(C) Candle clock
(D) Sand glass

Answer 1

Hint: These are some of the time measuring devices that we use. And in order to classify them as modern time measuring devices and ancient time measuring devices, we will understand their basic working principle of working mechanism. Once we do it we can then tell which of these are ancient time devices.

Complete answer:
Let us analyze the working principle of these time measuring devices:
(A) Incense clock: As the name suggests, these devices are based on incense sticks that have a previously calibrated time period. They are even attached with threads at one end to give a set of fixed time periods. At their other end they have a metal piece attached to them which falls on a metal plate signifying that a certain amount of time has passed. They have been in use since ancient times.
(B) Digital watch: A digital watch uses an electric circuit run by a battery that generates power to display time at the screen. This type of measuring device is modern and has been in use for the past few decades only.
(C) Candle clock: In this measuring device, markings were made on a sheet and put behind a candle. As the candle burnt, it gave the user an idea of how much time has passed by reading the markings. They were used indoors and on cloudy days and have been in use since ancient times.
(D) Sand glass: It uses two bowls of upside-down curved sand glasses joined together at their narrow end. One of them was filled with sand and the sand was then allowed to move downwards freely under gravity. When complete sand has been transferred, it indicates one full cycle of time period has been completed. They have been in use since ancient times.

So, the correct answer is “Option A, C and D”.

Note: All of these ancient devices only gave us a good idea of how much time has passed by. And that is why, overtime mechanical clocks with markings on them were introduced as they were more accurate and easier to maintain than their respective counterparts.