General Knowledge 75

Test # 75


1.
India's first commercial 'Prototype Fast Breeder Reactor' is being developed at which of the following place?

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Simple Science

Weather Maps

Air:
Scattered over the United States are about 125 Government Weather Stations, at each of which three times a day, at the same instant, accurate observations of the weather are made. These observations, which consist of the reading of barometer and thermometer, the determination of the velocity and direction of the wind, the determination of the humidity and of the amount of rain or snow, are telegraphed to the chief weather official at Washington. From the reports of wind storms, excessive rainfall, hot waves, clearing weather, etc., and their rate of travel, the chief officials predict where the storms, etc., will be at a definite future time. In the United States, the general movement of weather conditions, as indicated by the barometer, is from west to east, and if a certain weather condition prevails in the west, it is probable that it will advance eastward, although with decided modifications. So many influences modify atmospheric conditions that unfailing predictions are impossible, but the Weather Bureau predictions prove true in about eight cases out of ten.

The reports made out at Washington are telegraphed on request to cities in this country, and are frequently published in the daily papers, along with the forecast of the local office. A careful study of these reports enables one to forecast to some extent the probable weather conditions of the day.

The first impression of a weather map with its various lines and signals is apt to be one of confusion, and the temptation comes to abandon the task of finding an underlying plan of the weather. If one will bear in mind a few simple rules, the complexity of the weather map will disappear and a glance at the map will give one information concerning general weather conditions just as a glance at the thermometer in the morning will give some indication of the probable temperature of the day.



On the weather map solid lines represent isobars and dotted lines represent isotherms. The direction of the wind at any point is indicated by an arrow which flies with the wind; and the state of the weather - clear, partly cloudy, cloudy, rain, snow, etc. - is indicated by symbols.

FIG. Weather Map

Prepositions
Both yet and already are used with the present perfect tense.
  • Already is usually used in positive sentences.
  • Yet is usually used in questions and negative sentences.

    Imagine that you and your friend are going to travel. There are many things to do, and you ask your friend if he has done these things:
  • Have you bought the tickets yet?
  • Have you arranged a taxi yet?
  • Have you reserved the hotel room yet?
  • Have you packed the bags yet?

    In all the examples, use yet at the end of the question. Your friend might answer:
  • Yes, I've already bought the tickets.
  • Yes, I've already arranged a taxi.
  • No, I haven't reserved the room yet.
  • No, I haven't packed the bags yet.

    Use already in the positive answers, and yet in the negative answers.

    There is one time you can use already in questions: it's when something happens earlier than expected. If your son finishes his homework in just 15 minutes, you could ask: "Have you already finished your homework?!" because you were expecting it to take more time.

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