120. Grid lines are parallel to

A. magnetic meridian of the central point of the grid

B. line representing the central true meridian of the grid

C. geographical equator

D. none of these.

121. Whole circle bearing of a line is preferred to a quadrantal bearing merely because

A. bearing is not completely specified by an angle bearing is completely specified by an angle

B. Sign of the correction of magnetic declination is different in different quadrants

C. its trigonometrical values may be extracted from ordinary tables easily.

D.

122. In quadrantal bearing system, back bearing of a line may be obtained from its forward bearing, by

A. adding 180?, if the given bearing is less than 180'

B. subtracting 180?, if the given bearing, is more than 180?

C. changing the cardinal points, i.e. substituting N for S and E for W and vice-versa

D. none of these.

123. Reduced bearing of a line is an angle between

A. north line and given line measured clockwise

B. north line and given line measured anti-clockwise

C. east or west and the given line

D. given line and the part of the meridian whether N end or S end, lying adjacent to it.

124. If the whole circle bearing of a line is 270?, its reduced bearing is

A. N 90? W

B. S 90? W

C. W 90?

D. 900 W.

125. If the whole circle bearing of a line is 180?, its reduced bearing is

A. S 0? E

B. S 0? W

C. S

D. N.

126. The ratio of the linear displacement at the end of a line, subtended by an arc of one second to the length of the line, is

A. 1 : 206 300

B. 1 : 3440

C. 1 : 57

D. 1 : 100.

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