Question 17.4
Explain the following observations very briefly
Breathing through mouth may harm you.
You may inhale dust if present in air which may prove harmful.
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 17.1
A firki does not rotate in a closed area.
Question 17.2
The arrow of weather cock points towards a particular direction at a particular moment.