Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Science

Paheli dug two pits, A and B, in her garden. In pit A, she put a polythene bag packet with some agricultural waste. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. She, then covered both the pits with soil. What did she observe after a month?

Unscramble the jumbled word underlined in the following statement.

Xanrhat is a dangerous bacterial disease

Suggest a suitable word for the following statement.

Chemicals which kill or stop the growth of pathogens

Name two diseases that are caused by virus.

Write one important characteristic of virus.

Which of the following is a source of rayon?

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

Which of the following property is not responsible for copper to be used as electrical conduction wires?

Coal is processed in industries to get some useful products. Which of the following is not obtained from coal?

Coal is formed from the remains of

Which substance is formed by the carbonisation of dead vegetation?

Naphthalene balls are obtained from coal tar and are used as

When heated in air, coal burns and produces mainly ______ gas.

Coal tar is a black, thick ______ with an ______ smell.

The underlined word in the following sentence have been jumbled up. Write them in their correct form.

Loca is obtained from mines.

The slow process of conversion of dead vegetation into coal is called ______.

The black thick liquid with ______ smell is known as coal tar.

During the processing of coal to get coke, coal tar and ______ are also obtained.

Write True/False against the following statement.

Under high temperature and pressure, dead plants get slowly converted to coal. 

Write the characteristics and some important uses of coal.