(क) पदार्थ की रचना में परिवर्तन होता है। (ख) नया पदार्थ है
(ग) कोई परिवर्तन नहीं होता। (घ) केवल भौतिक गुणों में
निम्नलिखित में कौन-सा परिवर्तन उत्क्रमणीय है:-
(क) दूध का फट जाना (ख) दूध का दही बनना
(ग) दही से मक्खन निकालना (घ) घी का पिघलना
निम्नलिखित कौन-सा रासायनिक परिवर्तन है:-
(क) कोयले को पीसकर चूर्ण बनाना (ख) काँच की बो
(ग) कपड़े का फटना
(घ) कागज का
रासायनिकरिन
Answers
Answer:
Science and technology has such extraordinary uses which has totally changed human lifestyle. It has some unique uses which have helped us to compete with this challenging world. Its uses are indefinite and it can’t be described in some sentences in a piece of paper.
Science and technology have various uses in various sectors. Its use is sector wise. Such as in medical sector it is used in various medical operating tools, x-ray machines, blood pressure calculating machines, hear beat machines, etc. Similarly in engineering sector it is used in motors, machines carrying heavy load, etc. As well in home sector it is used in Air conditioner, Refrigerator, Gas stove, etc.
The use of science and technology is world wide. It has now become a compulsion for we people. That’s why its use is also high. It is also used in used in marketing work, office work, technical work, domestic work, etc. I think that there is no place in this whole planet where use of science and technology is not found. Its use has become global throughout the whole world.
Also science and technology is used in making work doing robot which can easily do all domestic as well as official work alone. It is also a type of gift provided by science and technology to this world. Science and technology has also been used in making spaceships, missiles, automobiles, etc. It has also been used in carrying research. Science and technology has folded whole planet in its use.
Overall, now we can say that there is no place in this planet where science and technology is not used. So, we should realize its uses and should only use it in positive way, so that we can gain from it. If we use it in negative way, we are the one who will get loss. So, its use is too much precious for us and also for place where we live in.
Explanation: