Question

Shown here is an hour glass(or sand clock). It is used to measure time.
When we start measuring the time using this clock, all the sand is on one
side, and then the clock is inverted. The sand starts falling into the other side.
When all the sand has fallen into the other side, we know that one hour has
passed. This sand clock can be used for one of the activities given below, but
is not suitable for the others. Which activity is this?
A To check if sand can mix completely with water.
B To check the approximate length of the day or night.
C To find out the number of seconds taken to reach from one place to
another
D To measure the number of seconds taken by an athlete to complete a
400 m race​

Answer 1

Answer:

A To check if sand can mix completely with water.

hope it helps you