SSLC (English Medium) कक्षा ७ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Complete the table.

Dog: ______.
______: Dengue.

Write a note on Chicken pox.

Richa had a pet dog. She vaccinated him regularly. He suddenly bit a stranger. Do you think that the person could have got Rabies?

______ happens when molecules in a gas cool down.

Match the following:

Plane mirrors are arranged parallel to each other to get  ______.

Moon going around Earth with 27 days period.

The word gibbous refers to phases where the Moon is more than half illuminated.

Name the planets which have no Moon.

Why does the Moon change its shape daily?

We never see the backside of the Moon from the Earth. Is it true?

______ is a synthetic fibre which is strong and elastic that it has the ability to bounce.

Ramya loves to were clothes made up of synthetic fibres. When she was working in the kitchen, her mother advised her not to wear synthetic clothes.

1. Why does Ramya’s mother advise her not to wear synthetic clothes while working in the kitchen?
2. Why does Ramya love to wear synthetic dresses?

______ is a chemical messenger involved in a number of complex biological reactions.

______ are used to treat the disease and to improve our health.

The adverse effects of antihistamines are mouth dryness and sleepiness.

Define histamine.

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

A substance which contains less number of molecules per unit volume is said to be denser.

Two spheres of same size are made from copper and iron respectively. Find the ratio between their masses (Density of copper is 8,900 kg/m and iron is 7,800 kg/m³ ).

A liquid having a mass of 250 g fills a space of 1000 cc. Find the density of the liquid.