The Fundamental Unit of Life — Science STD 9 — Question

Echoes are caused by the ______ of sound.

An object has __________ weight in outer space and during free fall. (More, Less, Zero)

The gases of air can be separated by fractional distillation because they have different ________. (Boiling points, Melting points, Densities)

An atom has atomic mass number 23 and atomic number 11. The atom has __________ Electrons.

A group of atoms carrying a fixed charge on them is called _______. (Polyatomic ion, Covalent bond, Molecular ion)

The particle which is formed by the loss or gain of electrons by an atom is called _________.

Miscible liquids are separated by __________.

Loudness of sound depends on _____.

1 joule is the work done when a force of one ______ moves an object through a distance of one ______ in the direction of _______.