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Feb 16, 2012

[Science] Physics 4TF

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Latest trend of UPSC in General Studies prelim paper, is
Give 2 or 4 statements and ask the candidate to identify the true/false statements.
I call them 4TF questions (4 Statements: True or False)



So here is something for practice in Physics section.
Identify the true and false statements from following list
  1. If the Rainbow is in front of you, the Sun must be on your left Side.
  2. The order of colors from outside to inside is : VIBGYOR.
  3. Mirage occours only on land.
  4. Mirage occours only in hot areas.
  5. A Matador uses red cape during Bull fight because Bulls (and other bovines) hate red color.
  6. A  bat uses Echo to determine location of an object.
  7. Ultra Sound imaging and X-ray Machines run on same principle.
  8. Diesel-Trucks don't have spark-plugs in their engine.
  9. In a Vaccum chamber, Helium Ballon and stone will fall at the same velocity.
  10. Solar cell produces AC current (Alternative current).

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6 comments:

  1. Hi mrunal,

    Please evaluate my answers..

    1. False. If the rainbow is in front of you then then the sun is behind you.

    2.False. Its inside to outside.

    3.False.

    4. True

    5.False. Bulls are color blind.

    6.True

    7.False as far as i know.

    8.Diesel engines dont have spark plugs. Only petrol and gas engines require spark plug.Thats why diesel cars are non compatoble with gas.

    9.i think false, because anyways the stone is heavier than a ballon.

    10. Solar cells produce only DC

    ReplyDelete
    Replies

    1. All of your answers are correct except No. 4 and 9.
      4. Mirages occur over snow as well.
      9. In vacuum both will fall at same rate.

      Delete

    2. Hi Sir,

      What About Question No 7 ??? both X-ray & US works on same principle only na ???

      Delete

  3. The order of colors from outside to inside is : VIBGYOR. This is True for the Secondary bow that if formed.

    ReplyDelete

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