Mohan was asked by his teacher to determine the boiling point of a liquid. He set up the appartus as shown in the figure. He rocorded the boiling point of the liquid as `140^(@)C` and reported the reading to this teacher. The teacher asked him to repeat the experiment after dipping the bulb of the thermometer in the liquid and also placing the beaker on a tripod stand covered with a wire gauze. After reading this narration, answer the following question :
(i) Was the reading taken by the student correct ?
(ii) What was the necessity of wire gauze?
(iii) How did teacher help the student?
(iv) What is teh value based information associated with this?

Explanation

(i) No, it was wrong, The bulb of the thermometer must dip in the liquid.
(ii) If the beaker is in direct contact with the flame, it might crack.
(iii) Teacher guided the student properly. By direct heating, an accident could occur and could cause serious injuries to the student.
(iv) In the laboratory or in the kitchan, we should never heat glass beakers or containers directly on the flame. These are likely to crack. However, Borocil beakers can be heated on direct flame.