A refrigerator is to maintain eatables kept inside at `9°C`.If room temperature is `36°C`,calculate the coefficient of performance.

A heating element using nichrome connected to a 230V supply draws an initial current of 3.2A which settles after a few seconds to a steady value of 2.8A. What is the steady temperature of the heating element if the room temperature is 27.0^(o)C ? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 x 10^(-4) ^(0)C^(-1)

The vapour pressure of pure benzene at 88^@C is 957 mm and that of toluene at the same temperature is 379.5 mm. Calculate the composition of benzene toluene mixture boiling at 88^@C at 1 atm pressure

​Sitha prepares tea for her brother. After preparing tea, the temperature of the tea was 80°C. She kept it for 5 minutes and gave to her brother when the temperature reached 50°C. If the surrounding temperature is 20°C, calculate the time it takes to cool from 60°C to 30°C.

In the pure form, which among the following is a liquid at room temperature (25^(@)C)