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Air is bad conductor of heat or partly c...

Air is bad conductor of heat or partly conducts heat, still vacuum is to be placed between the walls of the thermos flask because

A

it is difficult to fill the air between the walls of thermo flask

B

due to more pressure of air, the flask can crack

C

by convection,heat can flow through air

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
C
No flow of heat by convection in vaccum.
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DC PANDEY-CALORIMETRY AND HEAT TRANSFER-Check points 16.4
  1. In a room containing air, heat can go from one place to another

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  2. Ice formed over lakes has

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  3. Air is bad conductor of heat or partly conducts heat, still vacuum is ...

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  4. Why are two thin blankets are warmer than a single blanket of double t...

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  5. One likes to sit under sunshine in winter seasons, because

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

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  7. A body, which emits radiations of all possible wavelengths, is known a...

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  8. Distribution of energy in the spectrum of a black body can be correctl...

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  9. Which of the following law states that "good absorbers of heat are goo...

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  10. The ratio of the pressure power to the absorption power of all substan...

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

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  12. There is a black spot on a body. If the body is heated and carried in ...

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  13. In MKS system, Stefan's constant is denoted by sigma. In CGS system mu...

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  14. A black body radiates 20 W at temperature 227^(@)C. If temperature of ...

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  15. Two spherical black bodies of radii R(1) and R(2) and with surface tem...

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  16. A sphere has a surface area of 1.0 m^(2) and a temperature of 400 K an...

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  17. Two spheres of the same material have radii 1m and 4m and temperatures...

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  18. The area of a hole of heat furnace is 10^(-4)m^(2). It radiates 1.58xx...

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  19. If a body cools down from 80^(@) Cto 60^(@) C in 10 min when the tempe...

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  20. A block of metal is heated to a temperature much higher than the room ...

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