Question

Fig. shows a water heater in which water is heated by a gas burner from below. A and B are two pipes. (i) Name the pipe used as inlet for cold water. (ii) Name the pipe used as outlet for hot water. (iii) Show the direction of convection currents in the diagram so as to obtain hot water continuously.

Answer 1

$\to$ B pipe used for outlet for hot water because after heating water, water becomes less dense and it will rise through pipe B.

$\to$ A pipe is used for inlet for cold water because cold water gets heated and becomes less dense and then after hot water rises through pipe B