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By opening the door of a refrigerator in...

By opening the door of a refrigerator inside a closed room:

A

you can cool the room to a certain degree

B

you can cool it to the temperature inside the refrigerator

C

you ultimately warm the room slightly

D

you can neither cool nor warm the room

Text Solution

Verified by Experts

The correct Answer is:
C
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(A): A room can not be cooled by opening the door of a refrigerator in a closed room. (R ): Heat flows from lower temperature (refri-gerator) to higher temperature (room) .

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If the co-efficient of performance of a refrigerator is 5 and operates at the room temperature (27^(@)C) , find the temperature inside the refrigerator.

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AAKASH SERIES-THERMODYNAMICS-ADDITIONAL PRACTICE EXERCISE (LEVEL - I (MAIN) STRAIGHT OBJECTIVE TYPE QUESTIONS)
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  2. In a P-V diagram for an ideal gas (where P is along the y-axis and V i...

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  3. Internal energy of n1 moles of hydrogen at temperature T is equal to ...

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  4. In carnot engine efficiency is 40% at hot reservoir temperature T. For...

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  5. A container having 1 mole of a gas at a temperature 27^@C has a movab...

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  6. An ideal gas is found to obey pV^(3/2) = constant during an adiabatic ...

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  7. By opening the door of a refrigerator inside a closed room:

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  8. During the melting of a slab of ice at 273 K at atmospheric pressure:

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  9. Which of the following parameters does not characterise the thermodyna...

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  10. An ideal gas has molar specific heat 5R/2 at constant pressure. If 300...

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  11. Consider the following statement. The internal energy of an ideal mono...

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  12. At atmospheric pressure, 2 g of water having a volume of 2.00cm become...

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  13. What is the most likely value for Cr (molar heat capacity at constant...

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  14. Ideal gas undergoes an adiabatic change in its state form (P1 , V1 , T...

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  15. Then two moles of oxygen is heated from 0^@C to 10^@C at constant vol...

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  16. If heat Q is added reversibly to a system at temperature T and heat Q....

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  17. Which of the graphs shown below represents the variation of beta = -1...

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  18. 100 g of water is heated from 30^@C to 50^@C. Ignoring the slight expa...

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  19. A carnot engine operating between temperatures T1 and T2 has efficien...

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  20. A thermally insulated vessel contains an ideal gas of molecular mass M...

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