Heat energy lost by hot object is equal to heat enegy gained by cold object describes which principle-Principle of conservation of energy-Principle of heat exchange-Principle of conservation of mass-Principle of conservation of momentum-

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Standard X

Physics

Principle of Heat Exchange

Heat energy l...

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Heat energy lost by hot object is equal to heat enegy gained by cold object describes which principle?

Principle of conservation of momentum.

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Principle of conservation of energy.

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Principle of heat exchange.

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Principle of conservation of mass.

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Q. 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.
i. Heat is transferred from where to where?
ii. Which principle do we learn about from this process?
iii. How will you state the principle briefly?
iv. Which property of the substance is measured using this principle?

Q. The rockets work on the principle of conservation of :

(a) mass
(b) energy
(c) momentum
(d) velocity

Q. Assertion :Assertion : In interference and diffraction, light energy is redistributed. Reason: Reason :There is no gain or loss of energy, which is consistent with the principle of conservation of energy.

Q. According to the principle of heat exchange, heat lost by the hot object is the heat gained by the cold object.

Assertion: According to the principle of calorimetry: Heat gained by a cold body = Heat lost by a hot body.

Reason: Heat is a form of energy, so according to the law of conservation of energy, the energy cannot be created or destroyed and its sum total remains the same.

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