Answer:
(a) The
devices used to convert
(i) Solar energy into heat- Solar
cooker.
(ii) Solar energy into electricity- Solar cell.
(1/2x2)
(b) The wind rotates the blades of the windmill. This, in
turn, rotates the connecting rod (shaft) and the crank (U-bend) moves up and
down.
Since the pump rod is connected to the crank, the pump rod
of the water pump also moves up and down and lifts the water from the well or
flooded mine. Thus, the rotational movement of the blades of the windmill is
used to drive a large number of machines. (2)
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