Surveying and Levelling

81. Geodetic surveying is undertaken

1. For production of accurate maps of wide areas
2. For developing the science of geodesy
3. Making use of most accurate instruments and methods of observation
4. All the above

View answer

82. Greater accuracy in linear measurements, is obtained by

1. Tacheometry
2. Direct chaining
3. Direct taping
4. All the above

View answer

83. Grid lines are parallel to

1. Magnetic meridian of the central point of the grid
2. Line representing the central true meridian of the grid
3. Geographical equator
4. None of these

View answer

84. Horizontal distances obtained by thermometric observations

1. Require slope correction
2. Require tension correction
3. Require slope and tension corrections
4. Do not require slope and tension corrections

View answer

85. Horizontal distances obtained tacheometerically are corrected for

1. Slope correction
2. Temperature correction
3. Refraction and curvature correction
4. All the above

View answer

86. Hydrographic surveys deal with the mapping of

1. Large water bodies
2. Heavenly bodies
3. Mountainous region
4. Canal system

View answer

87. If Δ is the angle of deflection of a sample curve of radius R, the length of its long chord, is

1. R cos Δ/2
2. 2R cos Δ/2
3. R sin Δ/2
4. 2R sin Δ/2

View answer

88. If Δ is the angle of deflection of a simple curve of radius R, the distance between the mid-point of the curve and long chord, is

1. R (1 - sin Δ/2)
2. R (1 + sin Δ/2)
3. R (1 + cos Δ/2)
4. R (1 - cos Δ/2)

View answer

89. If Δ is the angle of deflection of the curve T₁ and T₂ are its points of tangencies, the angle between the tangent at T₁ and long chord T₁ T₂ will be

1. Δ/4
2. Δ/3
3. Δ/2
4. Δ

View answer

90. If Δ is the angle of the deflection of a single curve of radius R, the length of the curve is:

1. πRΔ/90°
2. πRΔ/180°
3. πRΔ/270°
4. πRΔ/360°

View answer