Why we wear wool sweaters and wool clothes to keep our body warm?
a) they trap air
b) they conduct heat very good
c) they are cheaper
d) all of these
Why birds fluff out in winter to remain warm?
a) they trap air in wings
b) they breath very hot air
c) they attract heat to themselves
d) all of these
Convection:
Convection, process by which heat is transferred by movement of a heated fluid such as air or water.
Which of the following is/are examples of convection of heat?
a) water current moving on the surface of boiling water
b) hot air balloon rises high in the sky
c) heating of metal rodd
d) both a and b
The transfer of heat by actual movement of molecules from hot place to cold place is known as………
a) conduction
b) convection
c) radiation
Convection can take place in which of the following state/s of matter?
a) gas
b) liquid
c) solid
d) both a and b
option b is correct...
by at 2024-07-19 22:23:50