0-9 attempt any five long answer type questions
a) When does a drought occur?
b) How will you show that air is dissolved in water?
What do you do with the left over food at home
d) List five activities that are possible due to the presence of air?
e) Why can a pace or a footstep not be used as a standard unit of length?
Do you think it is better to use compost instead of chemical fertilizers
Why
Explain the process of making yarn from fibre
Answers
Answer:
a) When does a drought occur?
Droughts happen when there is not enough rain for a long period of time. It's not like a dry spell - there is so little precipitation (rain, snow, sleet or any kind of moisture) that a whole region starts to dry out. Sometimes a drought takes decades to develop fully and they are very difficult to predict.
b) How will you show that air is dissolved in water?
Take some water in a glass or metal container like pan and heat it. Just before water begins to boil, you will notice some bubbles at the inner surface of the pan. These bubbles come from the air dissolved in water. This shows that air is dissolved in water.
d) List five activities that are possible due to the presence of air?
Five activities which are possible due to the presence of air are as follows:
Burning something.
Winnowing.
Flying kite.
Movement of firkin (toy windmill)
A ship moving because of sail.
e) Why can a pace or a footstep not be used as a standard unit of length?
Pace or a footstep cannot be used as a standard unit of length because it varies from person to person.
Do you think it is better to use compost instead of chemical fertilizers
Why?
Yes, it is better to use compost instead of chemical fertilizers. Compost is made out of natural or organic things like plant and animal wastes which do not cause any pollution. Whereas the chemical fertilisers are prepared from harmful chemicals which cause soil and water pollution
Explain the process of making yarn from fibre?
Yarns are made up of thin strands called fibers. The process of making yarn from fibers is called spinning. In this process, a mass of cotton wool are drawn out and twisted. This brings the fibers together to form yarn.
Explanation:
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