1300 J of heat energy is supplied to raise the temperature of 0.5 kg lead from 20° C to 40° C. Calculate the specific heat capacity of lead?
130 Jkg-1k-1
1300 Jkg-1k-1
120 Jkg-1k-1
1200 Jkg-1k-1
Water is used as an effective coolant because of its:
solvent nature
large specific heat capacity
low specific heat capacity
ability to exist in three states of matter
What is the latent heat of fusion of mercury?
180 x 103 J kg-1
3 x 103 J kg-1
21 x 103 J kg-1
12.5 x 103 J kg-1
One calorie of heat is the heat energy required to raise the temperature of 1 g of water from
13.5 °C to 14.5 °C
14.5 °C to 15.5 °C
15.4 °C to 15.5 ° C
14.4°C to 15.5 ° C
Due to the presence of salt in ice the melting point.
Increase from 0 to -22°C
Decreases from 0 to -22°C
Increase from 0 to 22°C
Decreases from 22 to 0°C
Calculate the heat capacity of a copper vessel of mass 150 g if the specific heat capacity of copper is 410 J/kg/k. How much heat energy will be required to increase its temperature from 25°C to 35°C?
615 J/k , 61.5 J
61.5 J/k , 615 J
615 Cal/°C , 61.5 Cal
61.5 Cal/°C , 615 Cal
What is the specific heat capacity of water ?
4200 Cal/g/k
1000 Cal/kg/°C
1000 x 103 Cal/kg/°C
4200 x 103 Cal/g/°C
The reverse change from liquid to solid phase with rejection of heat at a constant temperature is called
melting
fusion
freezing
boiling
In change of phase of a substance at a constant temperature, the energy supplied is used up in:
Increasing the average kinetic energy of its molecules
Decreasing the average kinetic energy of its molecules
Decreasing the potential energy of its molecules
Increasing the potential energy of its molecules
From the following choose the correct statement.
(a) 10 kg of water and 10000 gm of copper requires same amount of heat to raise their temperature through 1 °C.(b) 5 litre of water and 50 litre of water requires same amount of heat to raise their temperature through 1 °C.(c) 50 gm of copper and 500 gm of copper requires same amount of heat to raise their temperature through 1 °C.(d) 60 kg of water and 60000 kg of water requires same amount of heat to raise their temperature through 1 °C.
Both (a) and (c)
Only (a)
Only (d)
Only (c)
