Question

12. On which principle do chimneys work?
radiation
convection
conduction
none of these​

Answer 1

None of these is the correct answer.

Because chimney work in all radiation, convection,conduction

Answer 2

Answer:

On which principle do chimneys work?

$\qquad\qquad\underline{\textsf{\textbf{ \color{magenta}{convection} }}}$