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Four identical copper cylinders are pain...

Four identical copper cylinders are painted If they are all heated to the same temperature and left in vacuum which will cool most rapidly .

A

Painted shiny white

B

Painted rough black

C

Painted shiny black

D

Painted rough white

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The correct Answer is:
B
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NARAYNA-TRANSMISSION OF HEAT-C .U .Q
  1. Newton's law of cooling is a special case of .

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  2. The amount of heat energy radiated per second by a surface depends upo...

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  3. Four identical copper cylinders are painted If they are all heated to ...

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  4. If T(B) and T(s) are the temperatures of the body and the surroundings...

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  5. Newton's law of cooling is a law connected with .

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  6. Newton's law of cooling holds good provided the temperature difference...

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  7. A block of steel heated to 100^(@)C is left in a room to cool Which of...

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  8. Let there be four articles having colours blue red black and white. Wh...

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  9. Which of the following qualities are best suited for cooking utensils ...

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  10. The bulb of a thermometer is spherical and that of another is cylindri...

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  11. Which of the following methods of flow of heat is (are) based on gravi...

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  12. Two rods A and B of same metal and of same cross-section have length i...

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  13. While measuring the thermal conductivity of liquids the upper part is ...

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  14. The templitude of radiations from a cylindrical heat source is related...

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  15. Kirchoff's law states that

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  16. If pressure on a gas is increased from P to 2P then its heat conductiv...

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  17. Two layers of cloth of equal thickness provide warmer covering than a ...

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  18. In a room containing air, heat can go from one place to another

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  19. The reflectance and emittance of a perfectly black body are rspectivel...

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  20. Wien's displacement law fails at .

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