SSLC (English Medium) इयत्ता ८ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Match the following

Assertion: Small gaps left between railway lines.
Reason: It allows for the contraction of rails during summer.

You would have noticed some space being left on railway tracks. Why?

Arrange the following in order of decreasing the expansion of heating: Steel, milk, air.

Electricity produced on rubbing is ______.

A tiny particle that rotates around the nucleus of an atom is ______.

Sound cannot travel through ______.

Vibrations in a body produce ______.

Unwanted sounds are called ______.

Longitudinal waves are produced in solids liquids and also in gases.

In which medium the speed of the sound is maximum?

What types of medium are required for sound to travel?

What happens to the speed of sound when it gases from a solid to a gaseous state?

Write any two uses of ultrasonic sound.

What do you understand by the term echo?

What are the uses of infrasonic sound?

Explain the types of mechanical waves.

It is believed that they had ______ known the property of magnets even before 200 BC.

The most reactive metal is ______.

Atoms or groups of atoms having a charge are called ______.