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प्रश्न
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संबंधित प्रश्न
State any two measures to minimize the impact of global warming.
What is the Greenhouse effect?
What do you understand by the term latent heat?
The S.I. unit of specific latent heat is ______.
The specific latent heat of fusion of water is ______.
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℃?
Answer the following:
Explain the role of latent heat in the change of state of a substance.
What do you mean by the statement?
'The specific latent heat capacity of fusion of ice is 336 J per g'?
Name two factors on which the heat absorbed or given out by a body depends.
Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?
Explain, why no tracks are left on the ice during ice skating?
When ice is converted into water : constant temperature : : before the water evaporates : _______
Find the odd one out and give its explanation.
Write the name.
The phase in which solid substances are converted into liquid.
The latent heat of vaporisation is a term referred for the conversion of gas into liquid.
Write scientific reason.
Even if boiling water is constantly heated, its temperature does not rise.
Write scientific reason.
Use a pressure cooker to cook food in cold air.
Write scientific reason.
The bottom of some steel utensils used for cooking is copper.
The diagram below shows a cooling curve for a substance:
- State the temperatures at which the substance condenses.
- The temperature range in which the substance is in liquid state.
- Why do we prefer ice to ice-cold water for cooling a drink?
