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For a perfect insulator coefficient of t...

For a perfect insulator coefficient of thermal conductivity is .

A

zero

B

infinire

C

one

D

two

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The correct Answer is:
A
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NARAYNA-TRANSMISSION OF HEAT-C .U .Q
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  7. The thermal radiations are similar to .

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  8. The temperature at which a black body ceases to radiate energy is .

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  10. When a body has the same temperature as that of its surroundings

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  11. One healf of a slab of ice is covered with black cloth and the other h...

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  17. The absorptivity of Lamp black and platinum black is .

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  18. Absorptive power of a white body and of a perfectly black body respect...

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  19. Three bodies A,B,C are at -27^(@)C, 0^(@)C, 100^(@)C respectively The ...

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  20. At high temperature black body spectrum is .

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