Identify the part representing latent heat of vaporization in the temperature vs heat graph for melting of ice.

Heat required to melt $1 \mathrm{g}$ of ice is $80 \mathrm{cal}$. A man melts$60 \mathrm{g}$ of ice by chewing in one minute. His power is______

After using for some time, big transformers get heated up. This is due to the fact that

$1.$ current produces heat in the transformers.

$2.$ hysteresis loss occurs in the transformers.

$3.$ liquid used for cooling gets heated.

Select the correct answer using the code given below:

The instrument used to regulate temperature to a particular degree is called:

1. Thermostat

2. Thermometer

3. Pyrometer

4. Thermocouple