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

Silk cloth has an excess electron, so it becomes positively charged.

Materials that do not allow the current to pass through them are called insulators.

What will be the charges on silk and glass rods when they are rubbed against each other?

When a negatively charged glass rod is brought near another glass rod, the rod will move apart. Give reason.

When an ebonite rod is rubbed with fur, the fur transfers electrons to the ebonite rod. Why?

List the ways in which you can charge an object.

Name a few paramagnetic substances.

Liquid hydrogen, hydrazine, and ______ are liquid fuels.

The propellants may be in the form of a liquid or gas.

Liquid hydrogen, hydrazine, and ethyl alcohol are liquid fuels.

Combustion of solid propellants can be stopped once it is ignited.

Name the solid fuels used in rockets.

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.