Surveying and Levelling

321. The sag of 50 m tape weighing 4 kg under 5 kg tension is roughly

1. 0.043 m
2. 0.053 m
3. 0.063 m
4. 0.083 m

View answer

322. The sensitiveness of a level tube decreases if

1. Radius of curvature of its inner surface is increased
2. Diameter of the tube is increased
3. Length of the vapour bubble is increased
4. Both viscosity and surface tension are increased

View answer

323. The sensitivity of a bubble tube can be increased by

1. Increasing the diameter of the tube
2. Decreasing the length of bubble
3. Increasing the viscosity of liquid
4. Decreasing the radius of curvature of tube

View answer

324. The size of a plane table is

1. 750 mm × 900 mm
2. 600 mm × 750 mm
3. 450 mm × 600 mm
4. 300 mm × 450 mm

View answer

325. The slope correction for a 3° slope for a length of 100 m, is

1. -0.11 m
2. -0.12 m
3. -1.87 m
4. -0.137 m

View answer

326. The slope correction for a length of 30 m along a gradient of 1 in 20, is

1. 3.75 cm
2. 0.375 cm
3. 37.5 cm
4. 2.75 cm

View answer

327. The slope correction may be ignored if

1. The slope of the ground is less than 3°
2. To slope of the ground is say 1 in 19
3. Both (a) and (b)
4. Neither (a) nor (b)

View answer

328. The smaller horizontal angle between the true meridian and a survey line, is known

1. Declination
2. Bearing
3. Azimuth
4. Dip

View answer

329. The staff intercept will be

1. Greater farther off the staff is held
2. Smaller, farther off the staff is held
3. Smaller, nearer the staff is held
4. Same, wherever the staff is held

View answer

330. The staff reading at a distance of 80 m from a level with the bubble at its centre is 1.31 m. When the bubble is moved by 5 divisions out of the centre, the reading is 1.39 m. The angular value of the one division of the bubble, is

1. 28.8 sec
2. 41.25 sec
3. 14.52 sec
4. 25.05

View answer