Which of the following helps the birds to fly for long time in air without flapping their wings?
a) the gravity of the earth
b) their body weight
c) radiation current
d) thermal
Which of the following are the best thermal climbers?
a) hawks
b) vultures
c) pigeons
d) both a and b
Land and sea breeze are due to…….
a) conduction
b) convection
c) radiation
Radiation:
In physics, radiation is the emission or transmission of energy in the
form of waves or particles through space or through a material medium.
The transfer of
heat from a hot place to a cold place with or without having a material medium
in between, in the form of electromagnetic waves is called……..
a) conduction
b) convection
c) radiation
d) all of these
The heat from the heater reaches us by…….
a) conduction
b) convection
c) radiation
d) all of these
