Hydrogen differs from deuterium in __________ properties. ?->(Show Answer!)

1. Hydrogen differs from deuterium in __________ properties.

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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->Match List-I (Material) with List-II (Properties) and select the correct answer using the codes given in the options: List-I: A. Isotropic B. Homogenous C. Orthotropic List-II: 1. Different properties in three perpendicular directions 2. Same physical property in all directions at a point 3. Similar properties throughout the volume....

MCQ->This question consists of a statement followed by two courses of action numbered I and II given below it. A course of action is an administrative decision to be Everything in the statement to be true and then decide which of the suggested courses of action logically follow(s) from the given statement. Most of the people looking for buying/renting properties these days complain of being taken to the same property by more than 6-7 brokers. So even after contracting multiple agents, they end up having usually the same options. Courses of action : I. All the owners should strictly give the responsibility of their properties to only one. II. The brokers should be instructed to mandatorily disclose the list of all the properties they will be showing the customers on a particular day before taking them to the actual site.....

MCQ-> In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.The phrase consists usually of a few words which denote a single idea that __________ a separate part
of a sentence. In this respect it differs from the clause, ___________ is a short sentence that forms a distinct part __________ a composition, paragraph, or discourse.Correct phrasing is _______________ by rests, such rests do not break the ______________ of a thought or the progress of the sense.idea that __________ a separate part
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