CBSE 12th Standard Physics Subject Communication Systems Value Based Questions 5 Mark Questions With Solution 2021
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CBSE 12th Standard Physics Subject Communication Systems Value Based Questions 5 Mark Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Physics
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Mohan went to the market to purchase a TV set. He got confused with so many features and functions of electronic appliances. He took the help of his friend Sohan, a science student.Sohan explained him about the communication system, digital and analog signals. This knowledge proved of great help to Mohan in purchasing a colour TV.
Read the above passage and the answer the following questions:
(i) What do you mean by the term communication?
(ii) Which type of signals are better?
(iii) What type of nature Sohan has?
(iv)What is the minimum number of communication satellites required for global communication coverage?(a) -
In the famous conversation, Rakesh Sharma, the first Indian Astronaut in space, was asked by the Prime Minister Indira Gandhi as to how India looked from space.To which he replied,'Sare Jahan Se Achcha' (better than the whole world).
Read the above passage and answer the following questions:
(i) Which scientific mode of communication enabled the Prime Minister to speak to the Astronaut?
(ii) Name the scientific values displayed in this anecdote.
(iii) Which values are being reflected in the reply given by the astronaut?
(iv) Give one more example of this scientific mode of communication in everyday life situations.(a) -
Raj was cycling from his village to a neighbouring village.On the way, he met an old man who was walking in the direction of the same neighbouring village. Raj invited the old man to sit on his cycle and took him to the neighbouring village.The old man got down from the cycle, thanked Raj and gave him blessing.
Read the above passage and answer the following questions:
(i) What are the values displayed by Raj?
(ii) Can you relate the given paragraph with the process of modulation?(a) -
Group discussion was arranged in class XII on the topic of atmosphere. Three groups were made. Teacher asked the question "why can Moonbe not used as a communication satellite?" Answers were given by all the three groups. Each, group can give only one reason. Teacher told them that reason given by each group is correct. The groups collected all the three, reasons and came to correct conclusion,"
(i) Give the correct reason for the above question.
(ii) What values were showed by all the three groups?(a)
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CBSE 12th Standard Physics Subject Communication Systems Value Based Questions 5 Mark Questions With Solution 2021 Answer Keys
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(i) As set up that transfer information implicitly from one point to another is called communication system. Analog signal is better than a digital signal.
(ii) Sohan is an intelligent and knowledgeable person.
(iii) There are three communication satellites.
(iv) The three groups display the values if eagerness to engage in adebate, promptness in taking decision and ability to work in a constructive manner. -
(i) Radio wave communication system.
(ii) Use of scientific and technological advancement in service to mankind.
(iii) Patriotism and love for the country, presence of mind.
(iv) Television communication system. -
(i) Raj showed concern for the stranger and respect for the old age of the person.
(ii) Just as the old man sat on the cycle, the message signal is superposed on the carrier wave.The modulated carrier wave travels some distance.The message signal is then recovered from the modulated wave in the same way as the old man got down from the cycle. -
(i) Moon is a natural satellite of the earth but it is not an active satellite as it carries no electronic equipments for receiving, amplifying and transmitting the signal back to the earth. Moon cannot be used as a communication satellite because
(a) the distance between the earth and the moon is not proper.
(b) the period of revolution of the moon is not 24 hr.
(c) the moon is not revolving in the equitorial plane of the earth.
(ii) The three groups showed the values of eagerness to engage in a debate, promptness in taking decision and ability to work in a group in a constructive manner.
