Advertisements
Advertisements
प्रश्न
Explain, why is water used as a coolent in motor car radiators?
उत्तर
Water has the highest specific heat capacity of 4.2 Jg-1 °C-1 and its temperature does not rise beyond 100°C. Thus, it can absorb large amount of heat from the working engine, which is then radiated out through radiator Thus, on low temperature the engine works efficiently.
APPEARS IN
संबंधित प्रश्न
Differentiate between heat and temperature.
(i) Name the physical quantity which is measured in calories.
(ii) How is calorie related to the S.I. unit of that quantity ?
A piece of copper of mass 1 kg is dropped into 2 kg of water at 15°C. If the final temperature of the mixture is 40°C, calculate the intial temperature of copper.
A bucket contains 10 liters of water at 80°C. Cold water at 25°C is run from a tap into the bucket of hot water for 20 seconds and the temp. Of the water in the bucket falls to 50°C.
(a) Calculate the rate at which cold water came out of the tap.
(b) State an assumption made in the above calculation.
Name two factors on which the heat energy librated by a body on cooling depends.
Out of the three metals A, B and C of specific heat 900 J kg-1 °C-1, 380 J kg-1 °C-1 and 460 J kg-1 °C-1 respectively, which will you prefer for calorimeter? Given reason.
Why does atmospheric temperature fall after hail storm?
What happens to the average kinetic energy of the molecules as ice melts at 0°C?
40g of ice at 0°C is used to bring down the temperature of a certain mass of water at 60°C to 10°C. Find the mass of water used.
[Specific heat capacity of water = 4200 J kg-1 °C-1]
[Specific latent heat of fusion of ice = 336 × 103 J kg-1]
