(i) Mass vaccination is good as, it is used to make the socity free from the diseases like small pox.
(ii) Television for eradication of illiteracy and for mass communication of news and ideas is good as, it is a medium which is easily within the reach of common man and also they are very habitual to it.
(iii) Prenatal sex determination is bad because people are misusing it. Some of the people after determination of sex of child, think to abort. They do it especially with girl child.
(iv) Computer for increase in work efficiency is good as using the computer, a man can do much more work with greater efficiency and accuracy.
(v) Putting artificial satellite into orbits around the Earth is good for development as these satellites serve many purpose like remote sensing, weather foresting.
(vi) Development of nuclear weapons is bad as they can be used in mass destruction.
(vii) Development of new and powerful tool of chemical and biological warfare are bad, as they can also be used for mass destruction.
(viii) Purification of water for drinking purpose is good as we can save ourself from the diseases which we can have due to drinking of the water.
(ix) Plastic surgery is good as with the help of it a man or women can remove the skin defects occurring due to accident or some other reasons. It has some bad effects too but they are not very considerable.
(x) Cloning is good as far as animals are concerned. With the help of it, we can develop some species of animals which can be used to serve some specific purpose. But it is not good for human beings.

(I) Deepa's uncle is not educated and he is comparing the period of his early life when he could no have communication system, computers, LED's and LCDs. etc. with his present period.
(ii) Sympathy, helping, awareness and intelligence are the values displayed by Deepa.
(iii) Names of Indian Scientists are:
(a) H.J. Bhaba
(b) S.N. Bose
(c) CV. Raman
(d) J.C Bose

(i) The values displayed by Ravinder are: Intelligence, sharp mind, awareness and helping nature.
(ii) (a) Superconductivity.
(b) Einstein's Equation E = mc²
(c) Photoelectric effect.
(d) Theory of relativity.
(e) X-rays

No, it is not true. Physics has unlimited scope and its conceptual base can be noticed in immense number of activities/ fields. Can a cricket or a hockey player say that physics has nothing to do with his game? No, he is using collision phenomenon every second of his game along with Newton's laws of motion. Can you say that you walk without physics, talk without physics, eat without physics and so on, all that need friction. A musician uses physics. Physics is applied in every walk of life. Therefore we can not say that physics is noticed only in the practice of few blessed ones.

Imagination plays vital role in physics. Development of theories and concepts in physics originate from hypothetical imaginations. Heisenberg uncertainty principle, Huygens' principle, Maxwell equations, Schrodinger wave equation, Bohr's theory etc., were the imaginations of scientists which are successfully employed to explain the various phenomena occurring in nature.

Four fundamental forces present in nature are:
(i) Gravitational force
(ii) Electromagnetic force
(iii) Weak nuclear force
(iv) Strong nuclear force.

According to Einstein
(i) Mass and energy are interconvertible.
(Ii) Space and time are interconnected.

The explanation given in option (b) strikes as a scientific explanation.