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

A sphere of radius 1cm is made from silver. If the mass of the sphere is 33g, find the density of silver (Take π = 3.14).

State true of false. If false, give the correct statement.

Compounds and elements are pure substances.

Write the chemical formula and name the elements present in the following compounds.

1. Sodium chloride
2. Potassium hydroxide
3. Carbon dioxide
4. Calcium oxide
5. Sulphur dioxide

What are compounds? Give two examples.

Explain the characteristics of compounds

Assertion: Oxygen is a compound.

Reason: Oxygen cannot be broken down into anything simpler.

Assertion: Air is a compound.

Reason: Air consists of carbon dioxide.

Name the device used to generate electricity.

Explain the construction and working of a dry cell.

______ are non- green and nonphotosynthetic in nature.

HOTS

Which kingdom has saprophytic, parasitic and symbiotic nutrition. Why?

Say TRUE or FALSE

we are able to see things around us with the help of regular reflection

What are the three types of materials based on the absorption of light?

The first man-made fibre is ______.

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

A compound cannot be broken into simpler substances chemically.

Sodium chloride is used as table salt and for flavoring and preserving food.

Classify the following as element and compound,

1. Silver
2. Ammonia 
3. Water
4. Mercury.

Write any two properties of a compound.

Complete the table

Higher-Order Thinking questions:

Why is water considered a compound?