Question

(6 marks)
8. Give reasons for the following:
a) Birds migrate to different regions. State a reason with an example,
b) Concave mirrors are used in torches. Why?
c) Air conditioners are normally fitted to the top of the walls of rooms. Why?​

Answer 1

The reasons are -

Explanation:

1. Because of climatic changes

2. So that the beam of light can cover long distance

3. So that the hot air that rises up becomes cool

Answer 2

Answer:

a) Bird migration is a two-way journey from breeding or resting place to feeding or nesting place and vice versa. It is a periodic, regular, to and fro movement. Birds are the greatest migrants, however, some species of birds do not migrate. The birds which remain in a country throughout the year are called residents.

b) a concave mirror is used in torch lights , because the light ray from the source placed on the focus of a concave mirror are reflected in such a way that the reflected ray are strong, straight,and parallel.

c)Air conditioners are fitted at higher levels on the walls of a room in order to produce quick cooling in the room. This is because the cooled air from the AC comes down and the warm air from below rises up and a convection current is set up.

Explanation:

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