Thermal Properties Of Matter

Physics
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During an experiment, an ideal gas is found to obey a condition  constant [density of the gas]. The gas is initially at temperature T, pressure P and density . The gas expands such that density changes to 

A
The pressure of the gas changes to
B
The temperature of the gas changes to
C
The graph of the above process on the P-T diagram is parabola.
D
The graph of the above process on the P-T diagram is hyperbola.
Hard
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Assertion

Though air is a bad conductor yet a body kept in air loses heat quickly.

Reason

The heat loss is mainly due to radiation.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Both Assertion and Reason are incorrect
Hard
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