A. measuring approximate horizontal angles
B. setting out right angles
C. measuring bearings of the lines
D. none of the above
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Which of the following is not used in measuring perpendicular offsets ?
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For a line AB_______________?
A. line ranger
B. steel tape
C. optical square
D. cross staff
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If the true bearing of a line AB is 269° 30′, then the azimuth of the line AB is_____________?
A. the forebearing of AB and back bearing of AB differ by 180°
B. the forebearing of AB and back bearing of BA differ by 180°
C. both (A. and (B. are correct.
D. none is correct
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The length of a chain is measured from_______________?
A. 0° 30′
B. 89° 30′
C. 90° 30′
D. 269° 30′
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The maximum tolerance in a 20 m chain is_______________?
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
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Select the incorrect statement?
A. ±2 mm
B. ±3 mm
C. ±5 mm
D. ±8 mm
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For accurate work, the steel band should always be used in preference to chain because the steel band______________?
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
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In the prismatic compass______________?
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
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In the quadrantal bearing system, a whole circle bearing of 293° 30′ can be expressed as______________?
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