Heat Transfer
In a room contain air , heat can go from one place to another
Fill in the blanks: Heat transfer in solids is by _______________.
Heat transfer in solids is by conduction.
In a room contain air , heat can go from one place to another
Select the correct alternative: A given volume of alcohol and the same volume of water are heated from the room temperature to the same temperature then.
Select the correct alternative: The increase in length of a metal rod depends on
Write 'true' or 'false' for each statement: Liquids are heated by conduction and radiation.
Fill in the blanks: Heat transfer in liquids and gases is by _________.
Choose the correct alternative: Heat in a liquid is transferred by
Choose the correct alternative: The vacuum kept in between the walls of a thermos flask reduces the heat transfer by
Name the modes of transfer of heat in the following: (a) Solid, (b) Liquid, (c) Gas, (d) Vacuum.
A container with $$1 kg$$ of water in it is kept in sunlight, which causes the water to get warmer than the surroundings. The average energy per unit time per unit area received due to the sunlight is $$700 Wm^{-2}$$ and it is absorbed by the water over an effective area of $$0.05 m^2$$. Assuming that the heat loss from the water to the surroundings is governed by Newton’s law of cooling, the difference (in $$^{\circ}C$$) in the temperature of water and the surroundings after a long time will be ______. (Ignore effect of the container, and take constant for Newton’s law of cooling $$= 0.001 s^{-1}$$, Heat capacity of water $$= 4200 J \ kg^{-1} K^{-1}$$)