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प्रश्न
What property of water makes it an effective coolant?
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उत्तर
The high specific heat capacity of water makes it an effective coolant.
संबंधित प्रश्न
Calculate the mass of ice required to lower the temperature of 300 g of water 40°C to water at 0°C.
(Specific latent heat of ice = 336 J/g, the Specific heat capacity of water = 4.2J/g°C)
Water is used in hot water bottles for fomentation. Give a reason.
Read the following paragraph and answer the questions.
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If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. |
- Heat is transferred from where to where?
- Which principle do we learn about from this process?
- How will you state the principle briefly?
- Which property of the substance is measured using this principle?
Study the following procedure and answer the questions below:
1. Take 3 spheres of iron, copper and lead of equal mass.
2. Put all the 3 spheres in boiling water in a beaker for some time.
3. Take 3 spheres out of the water. Put them immediately on a thick slab of wax.
4. Note, the depth that each sphere goes into the wax.
i) Which property of substance can be studied with this procedure?
ii) Describe that property in minimum words.
iii) Explain the rule of heat exchange with this property.
The specific heat capacity of a body depends on _____________ .
Is it possible to condense the water formed, back to ice by adding ice at 0°C. Explain with reason.
State factors on which the amount of heat radiated by a body depends.
Express the change in internal energy in terms of molar specific heat capacity.
J/Kg °C is the unit of specific heat capacity.
A metal ball of heat capacity 50J/°C loses 2000 J of heat. By how much will its temperature fall?
