हिंदी

Heat Supplied to a Solid Changes It into Liquid. What is this Change in Phase Called?

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प्रश्न

Heat supplied to a solid change it into liquid. What is this change in the phase called?

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उत्तर

Solid → liquid, melting

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2017-2018 (March) Set A

संबंधित प्रश्न

What impact will climate changes have on the crops of food?


Read the following paragraph and answer the questions.

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.

  1. Heat is transferred from where to where?
  2. Which principle do we learn about from this process?
  3. How will you state the principle briefly?
  4. Which property of the substance is measured using this principle?

Give one example where high specific heat capacity of water is used as cooling.


State whether heat energy is absorbed or released during freezing of ice.

Water boils at 120 °C in a pressure cooker. Explain the reason.


What are other units of heat? Name and define them.


Why are athletes advised to put on extra clothes after competing on event?


A. hot solid of mass 60 g at 100°C is placed in 150 g of water at 20° C. The final steady temperature recorded is 25°C. Calculate the specific heat capacity of the solid. [Specific heat capacity of water = 4200 J kg-1 °C-1]


Derive Mayer’s relation.


Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then

Which metal piece will have greater mass if the rise in temperature is the same for both metals?


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