Write two points to be kept in mind while storing water in tanks.

What precautions are to be taken while pouring water on fire?

Write two precautions you take , while observing Rhizopus in the laboratory.

The one which cannot be stored in water is

Parvali house has a water tank in the shape of a cylinder on the roof. This is filled by pumping water from a sump (an underground tank) which is in the shape of a cuboid. The sump has dimensions 1.57 m times 1.44 m times 9.5 cm. The water tank has radius 60 cm. and height 95 cm. Find the height of the water left in the sump after the water tank has been completely filled with water from the sump which had been full of water. Compare the capacity of the tank with that of the sump. ( pi =3.14)

The eye lids of frog that protect them while in water is

In Tamil Nadu each and every person who wants to build the house has to promise that they will store rain water. Then only they will get permission for construction. Write your assumptions on why we have to store water.

Aerated water bottles are kept under cold water during summer. Why ?

In the experiment of observing a stone kept at the bottom of a water beaker through a convex lens which is also kept in water. What are the conclusions you have arrived ?