Black objects absorb more heat than white or polished ones. Give two daily uses of this principle.
Important Questions on Flow of Heat
Black objects radiate more heat than white objects. Give two everyday uses of this principle.
Draw a neat labelled diagram of a thermos flask. How does it prevent transfer of heat by conduction, convection or radiation?
Two test tubes full of water are heated-one from below and the other near the top. In which case will the water heat up faster and why?
In water, heat travels up much faster than it travels down. Explain.
In places with hot climate, it is advised that the outer walls of houses be painted white. Explain why.
Two objects at the same temperature - one bigger than the other - are placed in contact.
Will heat be transferred from one object to another? Explain.
Why are cloudy nights warmer than clear nights?
