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A piec of paper wrapped tightly on a woo...

A piec of paper wrapped tightly on a wooden rod is found to get charged quickly when held over a flame compared to similar piece when wrapped on a brass on a brass rod This is because .

A

brass is good conductor and wood is a bad conductor of heat

B

brass is a bad conductor of heat

C

wood contains large number of free electrons

D

wood is a good conductor of heat

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The correct Answer is:
A
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NARAYNA-TRANSMISSION OF HEAT-C .U .Q
  1. In steady state .

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  2. Two rods of different materials having differnet lengths and same cros...

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  3. A piec of paper wrapped tightly on a wooden rod is found to get charge...

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  4. When heat flows through a wire of uniform cross section under steady s...

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  5. Temperature is analogous to

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  6. On heating one end of a rod the temperature of the whole rod will be u...

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  7. For an ideal conductor thermal resistance is .

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  8. A metal rod of area of cross section A has length L and coefficient of...

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  9. Thermmal conductivity of a metal rod depends on .

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  10. Coefficient of thermal conductivity .

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  11. If the end of metal rod is heated then the rate of flow the heat does...

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  12. In the following solids thermal conductivity is maximum for .

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  13. For a perfect insulator coefficient of thermal conductivity is .

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  14. Why is it hotter at the same distance over the top of a fire than in f...

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  15. The process in which rate of transfer of heat maximum is .

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  16. By which of the following methods could a cup of hot tea loss heat whe...

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  17. The thermal radiations are similar to .

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

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  19. The intensity of energy radiated by a hot body at distance r from it v...

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

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