Surveying and Levelling

131. If the reduced bearing of a line AB is N60°W and length is 100 m, then the latitude and departure respectively of the line AB will be

1. +50 m, +86.6 m
2. +86.6 m, -50 m
3. +50 m, -86.6 m
4. +70.7 m, -50 m

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132. If the sight distance (S) is equal to the length of the vertical-curve (2l) joining two grades g₁% and - g₂%, the height of the apex will be

1. (S - l)/400 × (g₁ - g₂)
2. (g₁ - g₂)/400
3. (g₁ - g₂)S²/1600l
4. None of these

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133. If the smallest division of a vernier is longer than the smallest division of its primary scale, the vernier is known as

1. Direct vernier
2. Double vernier
3. Retrograde vernier
4. Simple vernier

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134. If the whole circle bearing of a line is 180°, its reduced bearing is

1. S 0° E
2. S 0° W
3. S
4. N

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135. If the whole circle bearing of a line is 270°, its reduced bearing is

1. N 90° W
2. S 90° W
3. W 90°
4. 90° W

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136. If vertical angles of inclined sights do not exceed 10° and non-verticality of the staff remains within 1°, stadia system of tacheometric observations are made on

1. Staff normal
2. Staff vertical
3. Staff normal as well as vertical
4. None of these

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137. If whole circle bearing of a line is 120°, its reduced bearing is

1. S 20° E
2. S 60° E
3. N 120° E
4. N 60° E

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138. Imaginary line passing through points having equal magnetic declination is termed as

1. Isogon
2. Agonic line
3. Isoclinic line
4. None of these

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139. In a closed traverse, sum of south latitudes exceeds the sum of north latitudes and the sum of east departures exceeds the sum of west departures, then, the closing line will lie in

1. North-west quadrant
2. North-east quadrant
3. South-east quadrant
4. South-west quadrant

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140. In a constant level tube, size of the bubble remains constant because upper wall is

1. Of relatively larger radius
2. Of relatively smaller radius
3. Flat
4. Convex downwards

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