The valve which guards the right atrio-ventricular aperture in human heart is ?->(Show Answer!)

1. The valve which guards the right atrio-ventricular aperture in human heart is

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MCQ-> Read the following passage carefully and answer the questions given below it.Certain words/phrases have been printed in bold to help you locate them while answering some of the questions.Princess Chandravati was very beautiful. She loved all kinds of ornaments and always wanted to wear the most precious and lovely jewels. Once, a jeweller came to the palace and gifted the king a wonderful diamond necklace. It glittered with big and small diamonds. It was certainly a very expensive necklace. The princess fell in love with it as soon as she saw it. So the king presented it to her. From that day on, the princess always wore that necklace, wherever she went. One day before going for a swim in the pond, she took the necklace off and put in the hands of her oldest and the most trustworthy servant. “Hold this and be careful. This is the most precious necklace in the whole world,” she said. The servant was an old woman. She sat under a tree, holding the ornament tightly and waited for the princess. It was a hot afternoon and the servant was very tired so she dozzed off .under the tree. Suddenly the servant felt that someone was tugging at the necklace and she woke up with a start. She looked around but no one was there and the necklace was gone. Scared out of her wits, the old servant started screaming. On hearing her scream the royal guards rushed to her. She pointed towards the direction in which the thief may have gone and the guards ran off that way. There was a poor and dim-witted farmer walking on the same road. As soon as he saw the royal guards running towards him, he thought that they wanted to catch him and started running. But he was not a strong man and could not outrun the hefty guards. The royal guards caught him in no time. “Where is it ?” they demanded, shaking him. “Where is what ?” the poor farmer stammered back. “The necklace you stole 1” thundered one of the royal guards. The farmer had no idea what they were talking about. He only understood that some precious necklace was lost and he was supposed to have it. He quickly replied, “I don’t know where it is now. I gave it to my landlord.” The guards ran towards the landlord’s house. “Give us the necklace right now !” the guards demanded of the fat landlord. “Necklace ? I don’t have any !” the stunned landlord replied. “Then tell us quickly who does,” demanded the soldiers. In order to get the royal guards off his back, the landlord pointed towards a priest who was walking by his house and said, “He does.” The guards now caught hold of the priest who was walking towards the temple and thinking about the lunch he had just eaten. The priest was stunned when one of the burly guards jumped on him and asked about the necklace. He remembered that the minister, Bhupati, was at the temple. He took the guards to the temple and pointed towards the praying minister, “I gave it to him,” he said. Bhupati too was caught and all four men were thrown in jail. The chief minister of the kingdom knew Bhupati well and was sure that Bhupati would never steal. He decided to find out who the culprit was. He hid near the jail where all four men were put and heard them talking. First, Bhupati asked the priest, “Panditji, why did you say that you gave the necklace to me ? I was quietly praying at the temple and now you have landed me in jail for no fault of mine.” The priest looked apologetic. He pointed towards the landlord and said, “I didn’t know what to say. He set the guards on me. I was simply passing by his house and was on my way to the temple.” The land lord looked at the priest sheepishly. Then he turned towards the poor farmer and yelled, “You lazy good-for-nothing man Why did you say that I had the necklace ?” The farmer, trembling under the angry gaze of all three men, said, “I was just walking home, The guards caught me and I did not know what to say.” On hearing, this conversation, the chief minister understood that all the four men were innocent. He immediately ordered the royal guards to search thoroughly, near the pond. The guards searched high and low till they saw something glinting on the tree. On the tree sat a monkey with the princess’ favourite necklace around his neck. It took a lot of coaxing and bananas before the monkey threw the necklace on the ground. The king apologised to all the four men and gave them gold coins as compensation. He requested his daughter to wear the necklace only indoors.Why did the king present the diamond necklace to his daughter ?
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MCQ->The valve which guards the right atrio-ventricular aperture in human heart is....

MCQ-> The passage given below is followed by a set of three questions. Choose the most appropriate answer to each question.The difficulties historians face in establishing cause-and-effect relations in the history of human societies are broadly similar to the difficulties facing astronomers, climatologists, ecologists, evolutionary biologists, geologists, and palaeontologists. To varying degrees each of these fields is plagued by the impossibility of performing replicated, controlled experimental interventions, the complexity arising from enormous numbers of variables, the resulting uniqueness of each system, the consequent impossibility of formulating universal laws, and the difficulties of predicting emergent properties and future behaviour. Prediction in history, as in other historical sciences, is most feasible on large spatial scales and over long times, when the unique features of millions of small-scale brief events become averaged out. Just as I could predict the sex ratio of the next 1,000 newborns but not the sexes of my own two children, the historian can recognize factors that made2 1 inevitable the broad outcome of the collision between American and Eurasian societies after 13,000 years of separate developments, but not the outcome of the 1960 U.S. presidential election. The details of which candidate said what during a single televised debate in October 1960 Could have given the electoral victory to Nixon instead of to Kennedy, but no details of who said what could have blocked the European conquest of Native Americans. How can students of human history profit from the experience of scientists in other historical sciences? A methodology that has proved useful involves the comparative method and so-called natural experiments. While neither astronomers studying galaxy formation nor human historians can manipulate their systems in controlled laboratory experiments, they both can take advantage of natural experiments, by comparing systems differing in the presence or absence (or in the strong or weak effect) of some putative causative factor. For example, epidemiologists, forbidden to feed large amounts of salt to people experimentally, have still been able to identify effects of high salt intake by comparing groups of humans who already differ greatly in their salt intake; and cultural anthropologists, unable to provide human groups experimentally with varying resource abundances for many centuries, still study long-term effects of resource abundance on human societies by comparing recent Polynesian populations living on islands differing naturally in resource abundance.The student of human history can draw on many more natural experiments than just comparisons among the five inhabited continents. Comparisons can also utilize large islands that have developed complex societies in a considerable degree of isolation (such as Japan, Madagascar, Native American Hispaniola, New Guinea, Hawaii, and many others), as well as societies on hundreds of smaller islands and regional societies within each of the continents. Natural experiments in any field, whether in ecology or human history, are inherently open to potential methodological criticisms. Those include confounding effects of natural variation in additional variables besides the one of interest, as well as problems in inferring chains of causation from observed correlations between variables. Such methodological problems have been discussed in great detail for some of the historical sciences. In particular, epidemiology, the science of drawing inferences about human diseases by comparing groups of people (often by retrospective historical studies), has for a long time successfully employed formalized procedures for dealing with problems similar to those facing historians of human societies. In short, I acknowledge that it is much more difficult to understand human history than to understand problems in fields of science where history is unimportant and where fewer individual variables operate. Nevertheless, successful methodologies for analyzing historical problems have been worked out in several fields. As a result, the histories of dinosaurs, nebulae, and glaciers are generally acknowledged to belong to fields of science rather than to the humanities.Why do islands with considerable degree of isolation provide valuable insights into human history?
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