Sources of Energy — Science STD 10 — Question

The noble gas having only two electrons in its valence shell is :

The functional group present in propanal is :

In stainless steel alloy, iron metal is mixed with:

The chemical which is not required for the preparation of soap in the laboratory is:

When a current flows through a conductor its temperature :

On moving from top to bottom in a group in the periodic table, valency :

The power of a converging lens is 4.5D and that of a diverging lens is 3D. The power of this combination of lenses placed close together is:

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

A part of the body which responds to the in-structions sent from nervous system is called :