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

Write some important uses of the various constituents of petroleum.

Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to

Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities?

Which one of the following statements is true about endemic species?

State whether the following statement is True or False. Correct the false statement.

Bison is an endemic fauna of Pachmarhi Biosphere Reserve.

Why are endemic organisms in greater danger of becoming extinct?

A new species X is introduced in a forest. How is it likely to affect the local species of that area?

AIDS can spread from an infected person to another person through

Unscramble the underlined word in the following sentence.

The development of a caterpillar to an adult butterfly is termed as poommertaissh.

Unscramble the underlined word in the following sentence.

The overgrowth of sumselc in xalnvr leads to the hoarse voice in adolescent boys.

Complete the following sentence.

Endocrine glands release hormones directly into ______ for transportation to the ______.

Complete the following sentence.

The sex hormones, ______ and estrogen are responsible for the development of characters.

During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is ______.

Two objects repel each other. This repulsion could be due to

A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough.

A girl is pushing a box towards east direction. In which direction should her friend push the box so that it moves faster in the same direction?

Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat soles. Which one would feel more comfortable while walking on a sandy beach? Give reasons for your answer.

Electric current is to be passed from one body to another. For this purpose, the two bodies must be joined by 

During the construction of a building, the lightning conductor was left hanging in the air by mistake. Would the lightning conductor be still effective? Explain.

If air and cloud were good conductors of electricity, do you think lightning could occur? Explain.