Surveying and Levelling

171. Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than

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

View answer

172. Let angular value of one graduation of a tube of length 'x' be 'φ' seconds and 'R' be the radius of its internal curved surface, then

1. φ = x/206265 R
2. φ = R/206265 x
3. φ = 206265/x. R
4. φ = x. R/206265

View answer

173. Locating the position of a plane table station with reference to three known points, is known as

1. Intersection method
2. Radiation method
3. Resection method
4. Three point problem

View answer

174. Location of contour gradient for a high way is best set out from

1. Ridge down the hill
2. Saddle down the hill
3. Bottom to the ridge
4. Bottom to the saddle

View answer

175. Magnetic bearing of a survey line at any place

1. Remains constant
2. Changes systematically
3. Varies differently in different months of the year
4. Is always greater than true bearing

View answer

176. Magnetic declination at any place

1. Remains constant
2. Does not remain constant
3. Fluctuates
4. Changes abruptly

View answer

177. Measuring with a 30 m chain, 0.01 m too short, introduces

1. Positive compensating error
2. Negative compensating error
3. Positive cumulative error
4. Negative cumulative error

View answer

178. Metric chains are generally available in

1. 10 m and 20 m length
2. 15 m and 20 m length
3. 20 m and 30 m length
4. 25 m and 100 m length

View answer

179. Mistakes which may produce a very serious effect upon the final results arise due to

1. In attention
2. In experience
3. Carelessness
4. All of these

View answer

180. Number of subdivisions per metre length of a levelling staff is

1. 100
2. 200
3. 500
4. 1000

View answer