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प्रश्न
Name two factors on which the heat absorbed or given out by a body depends.
उत्तर
The mass and specific heat capacity are two factors on which the heat absorbed or given out by a body depends.
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संबंधित प्रश्न
State two characteristics of a good thermion emitter.
State the effect of an increase of impurities on the melting point of ice.
What is the energy absorbed during the phase change called?
- Which requires more heat: 1 g ice at 0℃ or 1 g water at 0℃ to raise its temperature to 10℃?
- Explain your answer in part (a).
Explain the following:
The surrounding become pleasantly warm when water in a lake starts freezing in cold countries.
A molten metal of mass 150 g is kept at its melting point 800℃. When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat energy.
- What is the specific latent heat of the metal?
- If the specific heat capacity of metal is 200 J kg-1 K-1, how much additional heat energy will the metal give out in cooling to -50℃?
Explain the following temperature Vs. time graph:
A substance changes from its solid state to the liquid state when heat is supplied to it. What name is given to heat absorbed by the substance.
Explain why water is used in hot water bottles for fomentation and also as a universal coolant.
Explain the meaning of the term latent heat. State its S. I. unit.
Explain, why no tracks are left on the ice during ice skating?
Derive an expression for the amount of heat given out or taken up, when its temperature falls or rises by t°C.
Find the odd one out and give its explanation.
Define boiling point of a liquid.
Match the columns.
| Column A | Column B |
| 1) Specific latent heat of fusion | a) Air saturated with vapour |
| 2) Specific latent heat of vaporisation | b) Solid converts into liquid |
| 3) Dew point temperature | c) liquid converts into gas |
Match the columns.
| Column A | Column B |
| 1) Absolute humidity | a) J or cal |
| 2) Latent heat | b) J/kg °C |
| 3) Specific heat capacity | c) kJ/kg |
| 4) Heat | d) no unit |
| e) kg/m3 |
Write the name.
Products obtained when sugar is heated.
Write scientific reason.
Use a pressure cooker to cook food in cold air.
Who introduced the term latent heat?
