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

Give reason for the following statement.

Salt is added as a preservative in pickles

Name any two naturally occuring toxic substances in food.

Typhoid fever is caused by ______.

Cholera is caused by ______ and malaria is caused by ______.

Expand the following.

ORS- 

Name the organism causing diarrhoeal disease and give one precaution against it.

______ consists of a ‘U’ shape metal frame.

The precision of the screw gauge is 0.001 cm.

Write the principle of screw gauge.

Write about the positive zero error in the screw gauge instrument.

How will you find Zero errors in the screw gauge?

The force responsible for drying clothes in a washing machine is ______.

The separation of cream from milk is an example of the application of ______.

The force experienced by a boy in the merry-go-round is a centripetal force.

Sailors use ______ to find direction in order to navigate on the sea.

An electric bell contains an ______, consisting of coils of insulated wire wound around
iron rods.

A wire with green insulation is usually the live wire of an electric supply.

Define the magnetic effect of electric current.

Define step up and step down transformer.

The speed of light decreases in a denser medium, light bends towards the normal.