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.
|Maharashtra Class 9|
History and Political Science Solution
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-
- television broadcasting,
- radio broadcasting,
- taking pictures of water bodies, mineral deposits
- 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.