Question 17.1
Explain the following observations very briefly
A firki does not rotate in a closed area.
Lack of air movement.
Explain the following observation very briefly. (a) A firki does not rotate in a closed area. (b) The arrow of weather cock points towards a particular direction at a particular moment. (c) An empty glass in fact is not empty. (d) Breathing through mouth may harm you.
Question 17.3
An empty glass in fact is not empty.
Question 17.4
Breathing through mouth may harm you.
Question 17.2
The arrow of weather cock points towards a particular direction at a particular moment.