SSLC (English Medium) Class 8 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Name the fuels which do not need any ignition system.

What is a propellant?

Explain the two types of propellant.

Which of the following is false for gases?

Explain why?

1. A gas fills a vessel completely?
2. Camphor disappears without leaving any residue.

Phosphorous bums with suffocating smell and gives ______.

Oxygen is a poor conductor of heat and electricity.

Write about the combustible property of Oxygen.

Write the reaction of oxygen with non–metals.

Write a note on the rusting process.

Atoms of all metals will have ______ electrons in their outermost orbit.

All non–metals will have ______ electrons in the outermost orbit of their atoms.

The maximum number of electrons that can be present in the N shell is ______.

Anode rays travel in straight lines.

The relative charge of an electron is – 1. 

In a television tube, Cathode rays are deflected by magnetic fields.

An atom has a number of orbits and each orbit has protons.

Helium has two electrons in the outermost orbit and so it is chemically inert.

When an atom gains an electron it has more electrons and thus it carries a positive charge.

Assertion: Helium has four electrons in the outermost orbit.
Reason: Neon has eight electrons in the outermost orbit.