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Standard XI
Physics
Conservation of Mechanical Energy
Question

Reason
According to principal of conservation of energy, total energy of a system should remains conserved .
Assertion
We can not change the temperature of a body without giving (or taking ) heat to (or from) it.

A
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
B
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
C
Both Assertion and Reason are incorrect
D
Assertion is correct but Reason is incorrect
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Solution
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Correct option is D. Both Assertion and Reason are incorrect
We can change the temperature of a body without (or taking) heat to (or from) it. For example in an adiabatic compression temperature rises and an adiabatic expansion temperature false, although no heat is given or taken from the system in the respective changes,

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Q1
Reason
According to principal of conservation of energy, total energy of a system should remains conserved .
Assertion
We can not change the temperature of a body without giving (or taking ) heat to (or from) it.
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Q2

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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Q3
In any collision, the total energy remains conserved, though kinetic energy may or may not be conserved. How and why is this so?
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Q4
Two bodies at different temperatures are mixed in a calorimeter. Which of the following quantities remains conserved?

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(c) Total internal energy of the two bodies
(d) Internal energy of each body
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Q5
According to law of conservation of energy, energy changes from one form to another form, but the total energy of that system
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