Civil Engineering - Surveying Multiple Choice Questions and Answers

31. Cross staff is an instrument used for
a) measuring approximate horizontal angles
b) setting out right angles
c) measuring bearings of the lines
d) none of the above
 Ans: b

32. Normal tension is that pull which
a) is used at the time of standardising the tape
b) neutralizes the effect due to pull and sag
c) makes the correction due to sag equal to zero
d) makes the correction due to pull equal to zero
Ans: b

33. Which of the following is not used in measuring perpendicular offsets ?
a) line ranger
b) steel tape
c) optical square
d) cross staff
Ans: a

34. If the length of a chain is found to be short on testing, it can be adjusted by
a) straightening the links
b) removing one or more small circular rings
c) closing the joints of the rings if opened out
d) all of the above
Ans: a

35. The maximum tolerance in a 20 m chain is
a) ±2 mm
b) ±3 mm
c) ±5 mm
d) ±8 mm
Ans: c

36. For accurate work, the steel band should always be used in preference to chain because the steel band
a) is lighter than chain
b) is easier to handle
c) is practically inextensible and is not liable to kinks when in use
d) can be easily repaired in the field
Ans: c

37. The length of a chain is measured from
a) centre of one handle to centre of other handle
b) outside of one handle to outside of other handle
c) outside of one handle to inside of other handle
d) inside of one handle to inside of other handle
Ans: b

38. Select the incorrect statement.
a) The true meridians at different places are parallel to each other.
b) The true meridian at any place is not variable.
c) The true meridians converge to a point in northern and southern hemispheres.
d) The maps prepared by national survey departments of any country are based on true meridians.
Ans: a

39. If the true bearing of a line AB is 269° 30', then the azimuth of the line AB is
a) 0° 30'
b) 89° 30'
c) 90° 30'
d) 269° 30'
Ans: c

40. In the prismatic compass
a) the magnetic needle moves with the box
b) the line of the sight does not move with the box
c) the magnetic needle and graduated circle do not move with the box
d) the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
Ans: c
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