How to make water level indicator #shorts

Water pollution indicator is:

(a). What is a universal indicator? For what purrpose is it used? (b). How does a universal indicator work? (c). Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?

Contamination of water sewage is indicated by cysts of

A block of wood is floating in water at 0^@ C . The temperature of water is slowly raised from 0^@ C to 10^@ C . How will the precentage of volume of block above water level change with rise in temperature?

Tubifex in water indicates its

In a dam, water level rises 3 metres in 2 1/2 hours. How much will the water level rise in 1 14 minutes?