Sunday, October 18, 2009
Q.1: When, where and by whom was the first aerial journey made?
Ans: The first aerial journey was made over
Q.2: What is the essential difference between an airship and an aeroplane?
Ans: The essential difference between an airship and an aeroplane is that an airship is lighter than air machine, while an aeroplane is heavier than air machine.
Q.3: Who invented the internal combustion engine? Why was this type of engine so important to the development of flight?
Ans: The internal combustion engine was invented in 1876 by a German named Otto. This type of engine transformed the world by making possible the development of the motor car and the aeroplane.
Q.4: Who was the first man to fly in an aeroplane? What was the date of his first flight and how long did it last?
Ans: The first man to fly in an aeroplane was an American Orville Wright. He flew on
Q.5: What in brief are the respective functions of the reconnaissance aeroplane and the fighter?
Ans: A reconnaissance plane is built to survey the enemy territory while a fighter built to shoot dawn enemy bombers on its territory.
Q.6: How were the first bombing attacks on
Ans: The first bombing attacks on
Q.7: How did civil aviation benefit from rapid development of the bomber during the First World War?
Ans: Bombing attacks by airships turned the attention of Government and people to the development of fighter aircrafts, because anti aircraft guns had not proved very effective. This necessitated research into high speed and high altitude fights and led to the rapid development of aircraft manufacture.
Q.8: Why was it more difficult to fly from
Ans: Flying across the
Q.9: Why was the use of airships for passengers transport abandoned?
Ans: The use of airships for passenger transport was abandoned in favour of air craft because they had proved to be very unreliable.
Q.10: What new means of propulsion had greatly increased the speed of airliner in recent year? What kind of radio device contributes to their safety?Ans: Jet propulsion has greatly increased the speed of airliners in recent years. Radar is the wonderful radio device that contributes to their safety.
Q.1: At what speed do wireless waves move? What other waves move at this speed?
Ans: The wireless waves move at the speed of 299792.5 Kilometres per second. The light waves also move at the same speed.
Q.2: Why were wireless waves once called Hertzian waves?
Ans: Wireless waves were once called Hertzian waves because Heinrich Hertz, the German scientist was the first person who discovered these waves.
Q.3: In what years were wireless signals first transmitted over the
Ans: The wireless signals were first transmitted over the
Q.4: What facts are given in the text about the first use of wireless to bring help to a ship in distress?
Ans: When the
Q.5: Could speech be transmitted in the early days of wireless signalling? If not how were messages transmitted?
Ans: No, speech could not be transmitted in the early days of wireless signalling. The Morse code was sued instead of speech.
Q.6: During what period did sound broadcasting became generally established?
Ans: Sound broad casting became generally established in 1920’s.
Q.7: In what way is television an advance upon sound broad-casting?
Ans: Television is an advance upon sound broadcasting since pictures and not just sound can be sent by it.
Q.8: Is television in colour possible? If so, why is it not in general use?
Ans: Television in colour has been made possible. It is not in general use because it is expensive.
Q.9: What is the function of Radar?
Ans: The function of Radar is to locate position of aircraft ship.
Q.10: What use can the astronomer make of radio?Ans: The astronomer can now explore the vast universe by the use of radio telescope. It works by detecting radio waves sent by distant stars.
Q.1: According to author, what is the effect upon him of entering a bank to do business?
Ans: According to author when he enters a bank to do business, he gets frightened.
Q.2: Why did author decide to open an account?
Ans: The author decided to open an account with a bank because his salary had been raised to fifty six dollars a month and he felt that the bank was only place for it.
Q.3: What was the manager’s reaction when the author told him that he would like to see him alone?
Ans: When the author told the manager that he would like to see him alone the mangers looked at him with some anxiety. He felt that he had a terrible secret to tell.
Q.4: Why did manager looked relieved when he knew the purpose of author’s visit?
Ans: The manger looked relieved when author told him that he was not a detective but he wanted to open an account in his bank.
Q.5: What is the equivalent of fifty American dollars in
Ans: The equivalent of fifty American dollars in Pakistani currency is about 3000 rupees. The rate is Rs: 60 per dollar. It goes on changing time to time.
Q.6: What mistake did author make when he wrote the cheque?
Ans: When author wrote the cheque he wrote the figure of 56 instead of 6.
Q.7: Explain the meaning of Clerk’s question. How will you have it?
Ans: The Clerk wanted to know in what denomination of currency notes or coins, the author would like to cash the cheque.
Q.8: Why was there a roar of laughter when the author left the bank?
Ans: There was a roar of laughter when the author left the bank. Every one there had laughed at the fool that the author had made himself of by his funny behaviours.
Q.9: The author, Stephen Leacock was respected university teacher and a highly successful writer. Do you think this is a true story?
Ans: Keeping status of author Stephen Leacock in view I think that the story is not true.
Q.10: Why is it wiser to keep one’s money in a bank than to hoard it in one’s home?Ans: It is wiser to keep one’s money in bank, rather than to hoard it in one’s home for a number of reasons. In bank it is safe from thieves and burgles, from one’s own temptation to spend and to keep it there for benefit of country.