Question

Which of the following is/are true regarding water clock?
(This question has multiple correct options)
A. A water clock, also known as a clepsydra uses a flow of a measure time.
B. The candles had evenly spaced lines on them and were usually marked with numbers for each hour.
C. There are two types of water clock: inflow and outflow.
D. In an inflow water clock, a container is filled with water and the water is drained slowly and evenly out of the container.

Answer 1

Hint:Water clocks are one of the oldest clocks that do not depend on the observations of the movement of the celestial bodies. The water clocks work on the flow of a liquid, for example water. In a water clock a liquid is allowed to flow at a constant rate from a small hole.

Complete answer:
Let us first understand what is meant by water clocks.Water clocks are one of the oldest clocks that do not depend on the observations of the movement of the celestial bodies. The water clocks work on the flow of a liquid, for example water.

In a water clock a liquid is allowed to flow at a constant rate from a small hole. The surface of the container (in which the liquid is poured or taken out) has regular marking which indicates the time in hours. The level of the liquid tells us the time elapsed for a particular interval.
The water clocks are also known as clepsydras.

In a water clock, we can measure time either by making the water to flow inside the container or taking the water out of the container. When the water flows inside the container, the clock is called inflow water clock.When the water flows outside the container, the clock is called outflow water clock.Hence, there are two types of water clocks: inflow and outflow.

Hence, the correct options are A and C.

Note: Note that in an inflow water, the water is allowed to flow into the container at a constant rate. Whereas, in an outflow water, water is drained out of the container at a constant rate.It is necessary that the flow of water is constant in a water clock. However, it is very difficult to maintain the flow at a constant rate.