Why convection is not possible in solids?
a) particles of solids are vibrating
b) particles of solid cannot move freely
c) particles of solid can move freely
d) all of these
What happens to the bottom water in pot when heated?
a) bottom water become hot
b) bottom water rises due to low density
c) bottom water expand
d) all of these
Which of the following water is denser?
a) hot water
b) cold water
c) water vapors
Which of the following water is less dense?
a) hot water
b) cold waterb) cold water
c) moderate water
d) all of these
The hot water (lighter) moves up and cold water (denser) goes down to bottom and circulating flow of water is established. This is called……..
a) conduction current
b) convection current
c) radiation current
d) all of these
Explanation:Convection currents are movements of fluid caused by a temperature or density difference within a material.
The air near the surface of land becomes hotter during day and rises straight up. This is called
a) conduction current
b) convection current
c) radiation current
d) thermal
Option B ''convection current'' sounds correct
by at 2024-11-06 11:13:36