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

Name the principle which is used in rocket propulsion.

Explain the launching of a satellite in a particular orbit.

Name the two elements which are derived from the country.

Reason out

Elements are called semimetals.

An atom differs from its ion in ______.

A proton can be defined as a ______.

Assertion: Proton can be defined as a hydrogen ion (H⁺).
Reason: These photons are produced when one electron is removed from one hydrogen atom.

What are fluorescent materials?

An atom is electrically neutral. Give reason.

Aquatic plants make use of dissolved ______ for photosynthesis.

Explain the importance of dissolved salts in water.

Take two pots with similar plants. Water one of the plants with tap water and the other with seawater. Record your findings and note the difference observed.

Assertion: To neutralize the excess acid formed in the stomach, milk of magnesia is taken.
Reason: Milk of magnesia contains a base called magnesium hydroxide.

What is the reaction between an acid and a base called?

Write a note on:

Ant bite

Write a note on:

Wasp bite

What is the difference between an ant sting and a wasp sting?

‘Grass of water’ refers to  ______.

Phycoerythirini s a blue pigment.

Name the pigments found in algae.