Chlorination is a process used for water-purification. The disinfecting action of chlorine is mainly due to

Consider the following statements:

If there were no phenomenon of capillarity

• 1. it would be difficult to use a kerosene lamp
• 2. one would not be able to use a straw to consume a soft drink
• 3. the blotting paper would fail to function
• 4. the big trees that we see around would not have grown on the Earth

Which of the statements given above are correct?

Consider the following kinds of organisms:

• 1. Bat
• 2. Bee
• 3. Bird

Which of the above is/are pollinating agent/agents?

A person, stood alone in a desert on a dark night and wanted to reach his village which was situated 5

km east of the point where he was standing. He had no instruments to find the direction but he located the polestar. The most convenient way now to reach his village is to walk in the

Which one of the following sets of elements was primarily responsible for the origin of life on the

Earth?

The increasing amount of carbon dioxide in the air is slowly raising the temperature of the

atmosphere, because it absorbs