Question 2
In a solar panel for heat supply, state the function of each of the following parts:
(a) metal flat plate;
(b) thermal insulator;
(c) tubes.
Observation
This question was unpopular among candidates. Majority of the candidates were able to correctly state the function of the metal flat plate. Some candidates got (b) right but many failed (c).
The expected answer is
(a) Function of metal flat plate of solar panel
Receives and absorbs solar radiation to produce heat
(b) Function of thermal insulator of solar panel
Minimizes heat loss
(c) Function of tubes of solar panel
Helps to circulate the heat