267.  The sum of the interior angles of a geometrical figure laid on the surface of the earth differs from that of the corresponding plane figure only to the extent of one second for every
A. 100 sq. km of area
B. 150 sq. km of area
C. 200 sq. km of area
D. none of these.

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268.  Geodetic surveying is undertaken
A. for production of accurate maps of wide areas
B. for developing the science of geodesy
C. making use of most accurate instruments and methods of observation
D. all the above.

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269.  The distances AC and BC are measured from two fixed points A and B whose distance AB is known. The point C is plotted by intersection. This method is generally adopted in
A. chain surveying
B. traverse method of surveys
C. triangulation
D. none of these.

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270.  Mistakes which may produce a very serious effect upon the final results arise due to
A. in attention
B. in experience
C. carelessness
D. all of these.

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271.  The systematic errors which persist and have regular effects in the performance of a survey operation, are due to
A. carelessness
B. faulty instrument
C. inattention
D. none of these.

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272.  Pick up the correct statement from the following :
A. mistakes arise from inattention, inexperience or carelessness
B. systematic errors persist and have regular effects in the survey performances
C. accidental errors occur inspite of every precaution is taken
D. all the above.

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273.  The method of reversal
A. is usually directed to examine whether a certain part is truly parallel or perpendicular to another
B. makes the erroneous relationship between parts evident
C. both A and B
D. neither A nor B.

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