SSLC (English Medium) Class 7 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

What is antiseptics?

Name a few natural antiseptics.

India stands ______ in silk production in the world.

______ are boiled to get the silk.

The production of silk is called ______.

The silk moth feed on ______.

The larva of a silkworm is called ______.

Silk is the secretion of ______.

The spread of Anthrax can be controlled by ______.

List a few characteristic features of silk.

Write a note on Anthrax.

Questions based on Higher Order Thinking Skills:

Now answer the following questions.

1. Find the ratio of masses of spheres A and B.
2. Find the ratio of volumes of spheres A and B.
3. Find the ratio of masses of spheres A and C.

How are the diseases transmitted from one person to the other person?

SI unit of density is ______.

Density of mercury is ______.

State true or false. If false, correct the statement.

Water is denser than kerosene.

State true or false. If false, correct the statement.

A ball of iron floats in mercury.

Use the analogy to fill in the blank

Liquid : Litre :: Solid : ______.

Use the analogy to fill in the blank

Water: Kerosene:: _______ : Aluminium

Assertion: Wood floats in water.

Reason: Water is a transparent liquid.