Maharashtra Board Class 9 History Chapter 7 Science and Technology Solution

Maharashtra Board Class 9 History Solution Chapter 7 – Science and Technology

Balbharati Maharashtra Board Class 9 History Solution Chapter 7: Science and Technology. Marathi or English Medium Students of Class 9 get here Science and Technology  full Exercise Solution.

Std

Maharashtra Class 9
Subject

History and Political Science Solution

Chapter

Science and Technology


1.) (A) Choose the correct option from the given options and complete the statements.

(1) ……… .was named as the first Chairman of atomic energy commission.  

(a) Dr Homi Bhabha (b) Dr Homi Sethna (c) Dr A.P.J. Abdul Kalam (d) Dr Raja Ramanna

Ans)  (a) Dr Homi Bhabha

(2) ……… was the first completely indigenous communication satellite made by ISRO.  

(a) Aryabhatt  (b) Insat 1 B   (c) Rohini-75  (d) Apple

Ans) a) Aryabhatt

2.) (A)  Complete the activity as per the given instruction. Prepare a timeline of the progress of India in science and technology.

1961 to 1970                       1971 to 1980                   1981 to 1990                    1991 to 2000

1961-India’s first successful Rocket launch

1963-Telex services  started

1969- India launched its first rocket.

1974- Overseas communication programme was established

1975- India’s first satellite Aryabatta launched

1979- India’s first remote sensing satellite Bhaskar launched.

1984- first computerised reservation system in India

1988- Prithavi missile test

1989- Agni missile test

1994- Mobile phone service started

1998- India’s second nuclear test performed

2000-Restructuring of the Department of Telecommunications

(B) Identify and write the wrong pair. 

(1) Prithvi – surface to under water ballistic missile

(2) Agni  – surface to underwater ballistic missile

(3) Akash – from surface to air attacking missile

(4) Nag  – anti-tank missile

(B) Write short notes

(1) Space research

Ans)The National Committee for Space Research (NCSR) was established in 1960. In 1961,India’s first research rocket was launched from Thumba Equatorial Launch Center in Thumba in the State of Kerala.In 1969, our indigenously built rocket Rohini-75 was successfully launched. Then in 1975first Indian satellite Aryabhatta was successfully launched.. This success proved that Indian scientists were confident enough to acquire the technology for sending a message from the Earth Station and to assess the working of the satellite.

(2) Telex service

Ans) The ministry of Communications started the telex service in 1963. It Is a department of telecommunications started to transmit typed messages from one part of the country to another rapidly.In 1969, the telex service started in Devanagari script in Delhi; afterwards it has spread all over the world. Thoughthis service began to be used in different fields ,butafter 1990the significance of this service reducedwith the rise of internet.

(3)  Pokhran nuclear test

Ans) Pokhran nuclear test was the first nuclear test by India in 1974. India started its own  policy of missile development programme as U.S.A. refused to give India the technology for defence  related fields such as space research, communications and missile. After this India joined the rank of nations like the U.S.A, the U.S.S.R, France, China and Germany who had their own missile programmes.

(4) Bhaskar – 1 satellite

Ans) Bhaskar – 1 satellite is a remote sensing experimental satellite.India launched it in 1979in order to observe various things on the surface of the earth by remote sensing technology. It helped India to developwater bodies, mineral deposits and forecasting weather. It has helped to take photographsof bowels of the earth, environment and forests. Again it has collected many information  which were useful for oceanography.

3.) Explain the following statements with reasons.

(1) Pandit Nehru established the Atomic Energy Commission.

Ans) Pandit Nehru established the Atomic Energy Commission because he wanted to nurture a scientific temper and bring about the nation’s progress. Again, to produce electricity from atomic energy, increase the yield of food grains and make them last longer he had founded this on 10th August 1948.

 (2) India decided to conduct nuclear tests. 

Ans) ) India decided to conduct nuclear tests to save itself from the growing neighbouring countries. India’s two neighbours were started upgrading themselves by doing nuclear researches. Like China’s nuclear capability was beyond imagination and Pakistan was taking advantages of that. It was desperately  putting effort to  acquire nuclear weapons with China’s help.

(3) USA imposed economic sanctions on India.

Ans) USA imposed economic sanctions on India because On 11th May 1998, India carried out its second nuclear test to prove its nuclear preparedness and  proved that  there would be no first use of nuclear weapons by India.

4.) Answer the following questions in  detail.

 (1) Which of the everyday services are influenced by the satellite technology ?

Ans) Everyday services , influenced by the satellite technology are-

  1. telecommunication,
  2. internet,
  3. television broadcasting,
  4. radio broadcasting,
  5. taking pictures of water bodies, mineral deposits
  6. Weather forecasting. Etc.

(2) Why is Dr. A.P.J. Abdul Kalam called as the ‘Missile Man’?

Ans) After 1983Defence Research and Developement Organisation (DRDO)developed several missiles under the leadership of Dr A.P.J. Abdul Kalam. He has made a great contribution in the production of missiles. For his contribution Dr Kalam is known as the father of India’s missile programme and ‘Missile Man’ of India.

(3) How one can do computerised reservation  for rail travel ?

Ans) One can do computerised reservation  for rail travel  through website booking, where a person should have IRCTC account and should create login id with appropriate details.

(4) Write the key features of Konkan Railway

Ans) Konkan Railway started in 1998.It stretches over the four States of Maharashtra, Goa, Karnataka and Kerala. It covers a distance of 760 kilometres. There are 12 tunnels, 179 big and 1819 small bridges on this track. There are sensors fitted to the railway engines to avoid accidents.

Updated: December 23, 2020 — 12:52 am

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