SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions

All flowing substances, both liquids, and gases are called ______.

The pressure in mines is ______ than the sea level.

Hot air is ______ dense than ordinary air. 

The shape and size of the solids do not easily change.

Upthrust = weight of the fluid displaced – apparent weight of the object.

What is the SI unit of pressure?

What happens when pressure is increased in solids?

Assertion (A): Air gets thinner with increasing altitude.
Reason (R): The atmospheric pressure increases as we go up in mountains.

Assertion (A): A sleeping mattress is so designed that when you lie on it, a large area of your body comes in its contact.
Reason (R): This reduces the pressure on the body and sleeping becomes comfortable.

Assertion (A): Wide wooden sleepers are kept below railway lines to reduce pressure on the railway tracks and prevent them from sinking into the ground.
Reason (R): Pressure is directly proportional to the area in which it is acting.

Define thrust.

What are positive and negative ions?

What is the ground connection?

As electrons are revolving in the ______ of an atom they can be easily removed from an atom and also added to it.

If an electron is added in excess to an atom then the atom is ______ charged.

The excess of electrons makes an object negative and ______ of electrons makes it positive. 

Electric charge is ______ in nature.

A comb rubbed with hair and brought near pieces of paper attracts them, because both comb and paper get similarly charged.

How many electrons accumulate to make 1C of electric charge?

What is the charge of one electron?