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

What is pasteurization?

Why do we store bananas at room temperature?

Why is the oil used as a preservative for pickles?

Write a note on food preservatives.

In ______, the food materials are kept inside a cold room in a temperature range of 23°C to 30°C.

The addition of oil in pickles prevents the contact of air with the pickle.

The synthetic preservatives do not delay microbial growth and do not keep the food safe for long-duration.

Dried Neem leaves and turmeric are used to store food grains in our home to protect the grain from insects and Beetles.

Why is food preserved?

The shape of Vibrio cholerae is ______.

Cholera is a ______ disease.

Name one disease that is transmitted by houseflies. Mention their causative pathogen.

A baby is suffering from diarrhoea, while other babies in the same locality do not.
Mention the possible causes that you think. What would be the possible solutions for this?

A physical balance measures small differences in mass up to ______.

The domestic electricity in India is an ac with a frequency ______ of Hz.

Conceptual question.

Can electroplating be possible with alternating current?

The repeated reflection that results in persistence of sound is called ______.

Chromatography is based on the principle of ______.

______ is a chemical used in finger print analysis.

What is Forensic chemistry related to?