1.The resistance of a thermistor over a limited range of temperature is given the equation R=(T-203 C ) where c is a constant and T is the absolute

by

temperature. What will be the temperature on the Celsius scale of the thermistor at absolute

temperature of T = 300K?

2. A woman finds a front windshield of a car covered with ice at -12°C. The ice has a thickness of 4.5 x 10 mm and the windshield area is 125mm². The

density of the ice is 917kg/m³. How much heat is required to melt the ice? [S. H.C of ice = 2200J/kg/K, Li -3.3x10 J/kg].

3. An electric heater of power 2kW is used to heat 0.8kg of water in a container

of heat capacity 300J/K. If the water is initially at 18°C, how long will it take to

heat it to the boiling point of 100°C? What mass of water will have boiled awa

in 4 minutes?

[S. H.C of water = 4200J/kg/K, Lv = 2.3X10 J/kg]

4. Explain anomalous expansion of water.

5. Steel railway tracks are laid at 8°C. What size of expansion gap are needed 10m long rail sections if the ambient temperature varies from-10°C to 50°C?

[Linear expansivity of steel = 12 x 10 K¹]