" An ideal thermometer should have "

Before use, the mercury level in clinical thermometer should be below __________.

The resistance of an ideal voltmeter should be :

Clinical thermometer should not be immersed in ________ water.

Why a clinical thermometer should not be sterilized by boiling water?

An ideal contraceptives should be

An ideal contraceptive should be:

An ideal contraceptives should be

Boojho has three thermometers as shown in figure. He wants to measure the temperature of his body and that of boiling water. Which thermometer (s) should he choose?