Opposite of light ?->(Show Answer!)

1. Opposite of light

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MCQ-> In the modern scientific story, light was created not once but twice. The first time was in the Big Bang, when the universe began its existence as a glowing, expanding, fireball, which cooled off into darkness after a few million years. The second time was hundreds of millions of years later, when the cold material condensed into dense suggests under the influence of gravity, and ignited to become the first stars.Sir Martin Rees, Britain’s astronomer royal, named the long interval between these two enlightements the cosmic ‘Dark Age’. The name describes not only the poorly lit conditions, but also the ignorance of astronomers about that period. Nobody knows exactly when the first stars formed, or how they organized themselves into galaxies — or even whether stars were the first luminous objects. They may have been preceded by quasars, which are mysterious, bright spots found at the centres of some galaxies.Now two independent groups of astronomers, one led by Robert Becker of the University of California, Davis, and the other by George Djorgovski of the Caltech, claim to have peered far enough into space with their telescopes (and therefore backwards enough in time) to observe the closing days of the Dark age.The main problem that plagued previous efforts to study the Dark Age was not the lack of suitable telescopes, but rather the lack of suitable things at which to point them. Because these events took place over 13 billion years ago, if astronomers are to have any hope of unravelling them they must study objects that are at least 13 billion light years away. The best prospects are quasars, because they are so bright and compact that they can be seen across vast stretches of space. The energy source that powers a quasar is unknown, although it is suspected to be the intense gravity of a giant black hole. However, at the distances required for the study of Dark Age, even quasars are extremely rare and faint.Recently some members of Dr Becker’s team announced their discovery of the four most distant quasars known. All the new quasars are terribly faint, a challenge that both teams overcame by peering at them through one of the twin Keck telescopes in Hawaii. These are the world’s largest, and can therefore collect the most light. The new work by Dr Becker’s team analysed the light from all four quasars. Three of them appeared to be similar to ordinary, less distant quasars. However, the fourth and most distant, unlike any other quasar ever seen, showed unmistakable signs of being shrouded in a fog because new-born stars and quasars emit mainly ultraviolet light, and hydrogen gas is opaque to ultraviolet. Seeing this fog had been the goal of would-be Dark Age astronomers since 1965, when James Gunn and Bruce Peterson spelled out the technique for using quasars as backlighting beacons to observe the fog’s ultraviolet shadow.The fog prolonged the period of darkness until the heat from the first stars and quasars had the chance to ionise the hydrogen (breaking it into its constituent parts, protons and electrons). Ionised hydrogen is transparent to ultraviolet radiation, so at that moment the fog lifted and the universe became the well-lit place it is today. For this reason, the end of the Dark Age is called the ‘Epoch of Re-ionisation’. Because the ultraviolet shadow is visible only in the most distant of the four quasars, Dr Becker’s team concluded that the fog had dissipated completely by the time the universe was about 900 million years old, and oneseventh of its current size.In the passage, the Dark Age refers to
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MCQ-> Study the following information carefully and answer the questions given below : Eight persons — M, N, O, P, Q, R, S and T — are sitting around a circular table at equal distance between each other, but not necessarily in the same order. Some of them are facing the centre while some others are facing outside (i.e., in a direction opposite to the centre) Note : Facing the same direction means if one faces the centre then the other also faces the centre and vice-versa. Facing opposite directions means if one person faces the centre then the other person faces outside and vice-versa. R is sitting second to the right of Q. Only three persons are sitting between R and S. T is sitting second to the right of R. T faces the centre. R and S face opposite directions. P and S face opposite directions. N is sitting second to the left of P. P is not an immediate neighbour of Q. Only one person is sitting between P and O. O is not an immediate neighbour of Q. M is sitting third to the left of T. The immediate neighbours of T face opposite directions. M and R face opposite directions. N faces the same direction as that of O.Which of the following statements is true regarding T according to the given seating arrangement ?
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MCQ-> Read the following information and answer the questions given below. (I) Two wooden cubes ‘A’ and ‘B’ are placed adjacent to each other in front of you in such a way that ‘A’ is to your left and ‘B’ to your right. (II) One pair of opposite faces of cube ‘A’ is painted by the same colour, i.e., Red colour. Another pair of opposite faces is painted by Blue and one of the remaining faces of Yellow and other one is Violet. (III) Only two opposite faces of cube ‘B’ are painted by Blue colour. Remaining pairs of opposite faces are painted in such a way that opposite face of Brown colour is Green and one of the other two opposite faces is Black and the other is White.If Red surface of ‘A’ and Blue of ‘B’ are touching the table and Yellow of ‘A’ and Black of ‘B’ are facing you, then which coloured side of ‘B’ is facing Blue side of ‘A’ ?
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MCQ-> Study the following information carefully and answer the questions given below:Eight friends P, Q, R, S, W, X, Y and Z are sitting around a circular table but not necessarily in the same order. Some of them are facing the centre and some others are facing outside (i.e. in a direction opposite to the centre.) Note :(i) Facing the same direction means if one person faces the centre then the other also faces the centre and vice-versa. (ii) Facing the opposite directions means if one person faces the centre then the other faces outside and vice-versa. (iii) Immediate neighbours facing the same direction means if one person faces the centre then the other also faces the centre and vice-versa. (iv) Immediate neighbours facing the opposite directions means if one person faces the centre then the other faces outside and vice-versa. • R sits second to the right of Y. Only two persons sit between R and W. • P sits to the immediate right of W. W faces outside. • Only one person sits between P and Z. Immediate neighbours of P face opposite directions. • Q sits third to the left of Z. Q is not an immediate neighbour of P. • X faces a direction opposite to that of Y. X is an immediate neighbour of neither Y nor P. • Immediate neighbours of S face same direction. P does not face outside. • R and Q face a direction opposite to that of S.Four of the following five are alike in a certain way based on the direction they are facing and so form a group. Which is the one that does not belong to that group?
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MCQ-> Based on the information answer the questions which follow. Eight officers of Indian Trade Service meet for a cup of coffee at Coffee Point. The officers P, Q, R, S, T. U. V and W are seated in a circle and discuss issues related to Trade in Services, Trade in Intellectual Property Rights. Investments. Tariffs, Remedies. Standards. Trade Facilitation and Subsides not necessarily in the same order. An MBA student sitting on the next table overhears the discussion and ranks the issues as per their importance from 1 to 8. No two issues can have the same rank and no two officers can have the same position. Additional information available is: i. P is sitting to the immediate left of S and the officer opposite to S discusses issues pertaining to Remedies. ii. U's issue is ranked $$7^{th}$$ and there is one officer between U and the officer whose issue is ranked $$2^{nd}$$. iii. The officer whose issue is ranked 1 is not opposite to the officer whose issue is ranked 8 who represents issues related to Investments.iv. The ranks of the issues raised by the officers sitting opposite to each other cannot be both even or both odd. v. The officer discussing issues related to Trade in Services is sitting opposite to T. T is sitting at a gap of one place from P. vi. R is sitting opposite to Q and represent issues related to Standards and Trade in Intellectual Property Rights not necessarily in the same order. vii. P's issue was ranked 4th and he was discussing issues related to Tariffs and sits opposite to the officer ranked 5th who represents issues related to Subsidies. viii. The officers representing issues related to Trade in Services and Trade facilitation are sitting adjacent to each other.Which officer discusses Remedies and what is its rank?
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