Surveying and Levelling

121. 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

  1. d
  2. 1/d
  3. d2
  4. 1/d2

Correct answer: (C)
d2

122. If the intercept on a vertical staff is observed as 0.75 m from a tachometer, the horizontal distance between tachometer and staff

  1. 7.5 m
  2. 25 m
  3. 50 m
  4. 75 m

Correct answer: (D)
75 m

123. If the length of a chain line along a slople of θ° is l, the required slope correction is

  1. 2l cos2 θ/2
  2. 2l sin2 θ/2
  3. l tan2 θ/2
  4. l cos2 θ/2

Correct answer: (B)
2l sin2 θ/2

124. If the length of a transition curve to be introduced between a straight and a circular curve of radius 500 m is 90 m, the maximum deflection angle to locate its junction point, is

  1. 1°43' 08"
  2. 1°43' 18"
  3. 1°43' 28"
  4. 1°43' 38"

Correct answer: (C)
1°43' 28"

125. If the length of a transition curve to be introduced between a straight and a circular curve of radius 500 m is 90 m, the maximum perpendicular offset for the transition curve, is

  1. 0.70 m
  2. 1.70 m
  3. 2.70 m
  4. 3.70 m

Correct answer: (C)
2.70 m

126. If the long chord and tangent length of a circular curve of radius R are equal the angle of deflection, is

  1. 30°
  2. 60°
  3. 90°
  4. 120°

Correct answer: (D)
120°

127. If the plane table is not horizontal in a direction at right angles to the alidade, the line of sight is parallel to the fiducial edge only for

  1. Horizontal sights
  2. Inclined sights upward
  3. Inclined sight downward
  4. None of these

Correct answer: (A)
Horizontal sights

128. If the radius of a simple curve is 600 m, the maximum length of the chord for calculating offsets, is taken

  1. 15 m
  2. 20 m
  3. 25 m
  4. 30 m

Correct answer: (D)
30 m

129. If the radius of a simple curve is R, the length of the chord for calculating offsets by the method of chords produced, should not exceed.

  1. R/10
  2. R/15
  3. R/20
  4. R/25

Correct answer: (C)
R/20

130. If the rate of gain of radial acceleration is 0.3 m per sec3 and full centrifugal ratio is developed. On the curve the ratio of the length of the transition curve of same radius on road and railway, is

  1. 2.828
  2. 3.828
  3. 1.828
  4. 0.828

Correct answer: (A)
2.828

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