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An electric kettle takes 20 min. to heat...

An electric kettle takes 20 min. to heat a certain quantity of water from `0^@C` to boiling point. It requires 90 minutes to turn all the water at `100^@C` into steam. Find the latest heat of vaporisation.
(specific heat of water= 1 `cal//gm//^@C`)

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CHETANA PUBLICATION-THERMAL PROPERTIES OF MATTER-EXERCISE
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  9. Define coefficient of thermal conductivity. State its MKS unit

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  10. What ismeant by "thermal resistance"?Explain. State its SI unit and di...

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  11. Describe three applications of thermal conductivity

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  12. Give reason, why (i)Cooking is difficult at high altitude.

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  13. Give reason, why (ii)Cooking is faster in a pressure cooker.

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  15. What is the difference between boiling and evaporation?

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  16. Explain the process of heat transfer by convection.

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  17. Explain the following application of convection. (1) Heating and coo...

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  18. Explain the following application of convection. (2) Cooling of tran...

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  19. State some applications of convection.

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  20. What is meant by " free convection" and " forced convection".

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