Question

IV.-A (READING)
01. Read the following passage and answer the following questions:
(6 marks)
Mirrors have been used since ages. It is said that Archimedes used huge mirrors to focus the heat
of the sun's rays on enemy ships to burn them. The same principle is used in solar cookers,
where mirrors are used to reflect and focus the sun's rays on to cooking containers. Astronomers
use concave mirrors to focus starlight. The mirrors used in telescopes are polished by giving thin
coat of silver or aluminium to the glass. With the telescopes, astronomers can see the heavenly
bodies, but even without the telescopes one can see the moon. A full moon shining overhead is a
beautiful sight. But it is also a puzzle, because if the sun and the moon both give the same light.
then why is the moonlight more pleasant?The reason is that the moon reflects very little sunlight,
in fact, only seven percent of the light it receives. The earth reflects about half of the radiation
that it receives from the sun. Imagine how bright the earth must be looking from the moon! One
can even read a book on the moon in the earthlight. However, you do not have to travel all the
way to the moon to realize how strong the earth light is. Observe the crescent moon soon after all
the new moon. The bright crescent is illuminated by the sun, the rest of the moon is illuminated
by earthlight. In other words, the light reflected by the earth is falling on the moon. This is being
reflected back to us and is strong enough to show the moon faintly. As the crescent increases in
size, this effect disappears.
Answer the following questions:
(a) Mirrors used in telescopes are polished by
coating
(b) Archimedes used mirrors to focus the heat of the sun rays on
(c) The earth reflects
of the radiation received from the sun
(d) The principle of focusing the sun rays is used in
(e) The bright part of the crescent moon is illuminated by
(f) With the
astronomers can see the heavenly bodies.
02. Read​

Answer 1

Answer:

all answer I don't know but wan i know answer I can write