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A thermos flask is polished well...

A thermos flask is polished well

A

To make attractive

B

For shining

C

To absorb all radiations from outside

D

To reflect all radiations from outside

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The correct Answer is:
D
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ERRORLESS -TRANSMISSION OF HEAT-Radiation (General, Kirchoff s law, Black body)
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  2. Which of the following is the correct device for the detection of ther...

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  3. A thermos flask is polished well

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  4. Heat travels through vaccum by

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  5. The energy supply being cut-off, an electric heater element cools down...

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  6. We consider the radition emitted by the human body which of the follow...

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  7. The earth radiates in the infra-red region of the spectrum. The spectr...

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  8. Infrared radiation is detected by

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  9. Pick out the statement which is not true

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  10. A hot and a cold body are kept in vacuum separated from each other. Wh...

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  11. Good absorbers of heat are

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  12. For a perfectly black body, its absorptive power is

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  13. Certain substance emits only the wavelengths lamda1,lamda2,lamda3 and ...

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  14. Compared to a person with white skin another person with dark skin wil...

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  15. Relation between emissivity e and absorptive power a is (for black bod...

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  16. Which of the following statements is wrong ?

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  17. Half part of ice block is covered with black cloth and rest half is co...

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  18. If between wavelength lambda andlambda + dlambda, e(lambda) and a(lamb...

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  19. If 'p' calorie of heat energy is incident on a body and absorbs 'q' ca...

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