# heat transfer

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True or false
(i) Steel is better conductor of heat than bricks.
(ii) Radiations are ultrasonic waves.
(iii) Black body is having emissivity 2.
(iv) Natural convection do not need any external source for fluid flow.
(v) Fins cause increase in rate of heat transfer

• heat transfer -

1] True
2] False
3] False
4] True
5] True

• heat transfer -

explain thermal conductivity & give its variation in case of solids liquids & gases

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