Question

Q1. Comprehension Passage
a. The concept of the rocket, or rather the mechanism behind the idea of propelling an object into the air,
has been around for well over two thousand years. However, it wasn’t until the discovery of the reaction
principle, which was the key to space travel and so represents one of the great milestones in the history
of scientific thought that rocket technology was able to develop.
b. Not only did it solve a problem that had intrigued man for ages, but, more importantly, it literally opened
the door to exploration of the universe. An intellectual breakthrough, brilliant though it may be, does not
automatically ensure that the transition is made from theory to practice.
c. Despite the fact that rockets had been used sporadically for several hundred years, they remained a
relatively minor artifact of civilization until the twentieth century. Prodigious efforts, accelerated during
two world wars, were required before the technology of primitive rocketry could be translated into the
reality of sophisticated astronauts.
d. It is strange that the rocket was generally ignored by writers of fiction to transport their heroes to
mysterious realms beyond the Earth, even though it had been commonly used in fireworks displays in
China since the thirteenth century. The reason is that nobody associated the reaction principle with the
idea of travelling through space to a neighbouring world.
e. A simple analogy can help us to understand how a rocket operates. It is much like a machine gun mounted
on the rear of a boat. In reaction to the backward discharge of bullets, the gun, and hence the boat, move
forwards. A rocket motor’s ‘bullets’ are minute, high-speed particles produced by burning propellants in
a suitable chamber.
f. The reaction to the ejection of these small particles causes the rocket to move forwards. There is evidence
that the reaction principle was applied practically well before the rocket was invented. In his Noctes
Atticae or Greek Nights, Aulus Gellius describes ‘the pigeon of Archytas’, an invention dating back to
about 360 BC. Cylindrical in shape, made of wood, and hanging from string, it was moved to and fro by
steam blowing out from small exhaust ports at either end. The reaction to the discharging steam provided
the bird with motive power.

Answer the Following:
1. What is the name of the principle on which rocket works?
2. Why was rocket technology considered as a milestone in history of science?
3. Describe in 20-30 words how rocket operates.
4. Who has started using rocket as crackers and in which year?
5. What is the importance of 360 B.C.?
6. Write the meaning of following
a. accelerate b. propellant

Answer 1

Answer:

ur answer is above in the passage .

u also can do it

Answer 2

Explanation:

1. the idea of propelling an object into the air.
2. because it was the key to space travel and so represents one of the great milestones In history of science
3. a simple analogy can help us to understand how a rocket operates . it is much like a machine gun mounted on the rear of the boat .
4. China in the thirteenth century.
5. because Atticae or Greek nights , aulus gellius describes the pigeon of archytas an invention back to about 360 B.c