One must never put a sharp pointed object into the ............., it may rupture the ....

An object may have

An object may have

One must always breathe by the ............. and never by the ..........

One should never drink polluted water .

It is harmful to use a sharp object for cleaning the ear.

Fluorination of alkenes takes place ................ and may result in the rupture of ................ bond.

Sharp peak point A represents

The substance that does not have sharp ,melting point is

A lens with a focal length of 16 cm produces a sharp image of an object in two positions, which are 60 cm apart. Find the distance from the object to the screen.

At the end point, there is a sharp change of colour in the indicator. This happened because the