S N Jha, Geeta Negi and, Neelima Jain Solutions for Chapter: Air Around Us, Exercise 3: EXERCISES

Study the activity shown in the figure given alongside when the soil was placed in water, suddenly bubbles started coming up to the top surface of the water. 

Where did the bubbles come from? 

A beaker is inverted and lowered onto a burning candle as shown alongside. 

What will happen to the candle? Explain briefly. 

In the activity shown in the figure, a paper kept over the mouth of the glass does not fall although the glass is full of water and its weight is acting downwards. What does this experiment show?

Are you aware of any planet or satellite where there is no atmosphere? What is the major difference in those planets and earth? 

Carbon dioxide leads to global-warming, still, then it is important to have carbon dioxide in the air. Why? 

Parul always keeps the doors and windows of her room closed. But her grandfather keeps the windows of his room open to let the fresh air come in the room. On the basis of the given information answer the following question: 

Which one is healthy, Parul or her grandfather? Give the reason also. 
 

Parul always keeps the doors and windows of her room closed. But her grandfather keeps the windows of his room open to let the fresh air come in the room. On the basis of the given information answer the following question: 

What should a person do to remove the stale air from his room if there is no window in the room?

Parul always keeps the doors and windows of her room closed. But her grandfather keeps the windows of his room open to let the fresh air come in the room. 

On the basis of the above information answer the following question : 

Which type of values are displayed by Parul's grandfather?