Question

Read the passage given below and answers the questions that follow:
Animals are great builders, using simple materials but employing sound engineering principles. Man has long used suspension bridges made of ropes of steel and concrete, which bear loads in tension. The webs of spiders provide the most vivid examples of animals structures built entirely in tension. Spider-web silk is so strong that many species of birds use it to build their nests. It has a stiffness index which is 30 times less than that of steel yet has a tensile strength one and a half times as much as that of steel. Unlike steel, silk stretches to more than twice its original length before breaking. These qualities are owing to silk being a protein polymer. Beavers are natural engineers. They use tree branches to construct dams, the divided end being pressed into the walls this apparently serves to collect stress from a broad area and to focus it into a single truck embedded in the substrate of the steam. The dams of the beaver have an angle of 45° on the downstream side. This enables the structure to bear not only its own weight acting downward but also resist the lateral pressure of water acting on the upstream side.
(a) Which three engineers of nature are discussed here?
(b) To whom does man owe to his knowledge of suspension bridge?
(c) With what do the beavers construct dams?
(d) What is the angle of beaver’s dam?

Answer 1

a) ANIMAL, MAN AND INSECT ARE discussed as the three engineers of nature.
b) man owe to his knowledge of suspension bridge made of roots of Steel and concentrate which beer loads in tention
c) beavers use tree branches to construct dams.
d) angle of beavers dam is 45 degree.
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Answer 2

Answer:

a)Animal,man and spider are the three engineers of nature .

b)Man has long used suspension bridges made of ropes of steel and concrete which bear loads in tension.

c)Beavers use tree branches to construct dams

d) 45 degree

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