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

Write a note on thermostat.

_______ is used as a fertilizer.

Dry ice is used as a ______.

Define valency of an element with respect to hydrogen.

Permanent hardness of water is due to the presence of _______.

Temporary hardness of water can be removed by ________ of water.

What are the methods of removing hardness of water?

What is permanent hardness of water? How can it be removed?

Distinguish between octane number and cetane number.

Common cold in human is caused by ______.

Chicken pox is a communicable disease.

Citrus canker is transmitted by insects.

What are pathogens?

Write a short note on common human diseases caused by microorganisms.

The method in which water flows over the soil surface and allow it to infiltrate is

What is a biosphere reserve?

What do you understand by the term bio magnification?

The wear and tear in the machine part is due to ______.

What is surface tension? Explain the applications of surface tension.

Why is raindrop spherical in nature?