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1.

As applied to staff readings, the corrections for curvature and refraction are respectively
The above table shows a part of a level field book. The value of X should be                        
A. 98.7 B. 100
C. 102.3 D. 103.3



2.

If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to                        
A. d B. 1/d
C. d2 D. 1/d2



3.

Which of the following methods of con-touring is most suitable for a hilly terrain ?                        
A. direct method B. square method
C. cross-sections method D. tacheometric method




4.

Which of the following statements is in-correct ?                        
A. Error due to refraction may not be completely eliminated by reciprocal levelling. B. Tilting levels are commonly used for precision work.
C. The last reading of levelling is always a foresight. D. All of the above statements are incorrect.



5.

With the rise of temperature, the sensitivity of a bubble tube                        
A. decreases B. increases
C. remains unaffected D. none of the above



6.

A metallic tape is made of                        
A. steel B. invar
C. linen D. cloth and wires



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