Question

D. Give reasons.
1. A balloon becomes bigger when we fill it with air.
2. A balloon bursts if we continue to blow air in it.
3. A candle goes off after sometime, when it is covered in a jar.
4. Astronauts need to carry oxygen when they go to space.
5. The water in a well is mostly clean.​

Answer 1

Answer:

here is ur answers

Explanation:

1)air occupies space and if we put it in a ballon then the air will take space inside the ballon and thus it becomes bigger.

2)A ballon burst because the ballon can only stretch to a certain extent thus it explode.

3)oxygen gen is a very important source of combustion and if it is not present then the fire will go off thus when we put a jar on top of a candle it uses the oxygen and when it is not present it goes off.

4)A we all know that there is no oxygen in space and we cannot live without oxygen thus the astronauts needs to carry oxygen cylinder to stay alive.

5)well is directly dug into earth's surface ie to underground water table. ... and the rain water is mostly clean and free from germs and impurities etc. moreover, when it passes through soil to reach water table it gets purified. hence, well water mostly is pure and clean.