Surveying Set 3 MCQs

Q1 | Which of the following errors can be neutralised by setting the level midwaybetween the two stations ?

error due to curvature only

error due to refraction only

error due to both curvature and re-fraction

none of the above

Q2 | Height of instrument method of levelling is

more accurate than rise and fall method

less accurate than rise and fall method

quicker and less tedious for large number of intermediate sights

none of the above

Q3 | The rise and fall method

is less.accurate than height of instrument method

is not suitable for levelling with tilting levels

provides a check on the reduction of intermediate point levels

quicker and less tedious for large number of intermediate sights

Q4 | If the staff is not held vertical at a level¬ling station, the reduced level calculatedfrom the observation would be

true R.L.

more than true R.L.

less than true R.L.

none of the above

Q5 | The difference between a level line and a horizontal line is that

level line is a curved line while hori-zontal line is a straight line

level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line

horizontal line is normal to plumb line while level line may not be normal to the plumb line

both are same

Q6 | The sensitivity of a bubble tube can be increased by

increasing the diameter of the tube

decreasing the length of bubble

increasing the viscosity of liquid

decreasing the radius of curvature of tube

Q7 | With the rise of temperature, the sensitivity of a bubble tube

decreases

increases

remains unaffected

none of the above

Q8 | Refraction correction

completely eliminates curvature correction

partially eliminates curvature correction

adds to the curvature correction

has no effect on curvature correction

Q9 | The R.L, of the point A which is on the floor is 100 m and back sight reading on A is 2.455 m. If the foresight reading on the point B which is on the ceiling is 2.745 m, the R.L. of point B will be

94.80 m

99.71 m

100.29 m

105.20 m

Q10 | As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be

98.7

100

102.3

103.3

Q11 | 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 to

d

1/d

d2

1/d2

Q12 | Sensitiveness of a level tube is designated by

radius of level tube

length of level tube

length of bubble of level tube

none of the above

Q13 | Which of the following statements is in-correct ?

Error due to refraction may not be completely eliminated by reciprocal levelling.

Tilting levels are commonly used for precision work.

The last reading of levelling is always a foresight.

All of the above statements are incorrect.

Q14 | Dumpy level is most suitable when

the instrument is to be shifted frequently

fly levelling is being done over long distance

many readings are to be taken from a single setting of the instrument

all of the above

Q15 | The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

equidistant from A and B

closer to the higher station

closer to the lower station

as far as possible from the line AB

Q16 | Contour interval is

inversely proportional to the scale of the map

directly proportional to the flatness of ground

larger for accurate works

larger if the time available is more

Q17 | An imaginary line lying throughout the surface of ground and preserving aconstant inclination to the horizontal is known as

contour line

horizontal equivalent

contour interval

contour gradient

Q18 | The suitable contour interval for a map with scale 1 : 10000 is

2 m

5m

10 m

20 m

Q19 | Select the correct statement.

A contour is not necessarily a closed curve.

A contour represents a ridge line if the concave side of lower value con¬tour lies towards the higher value contour.

Two contours of different elevations do not cross each other except in case of an overhanging cliff.

All of the above statements are correct.

Q20 | A series of closely spaced contour lines represents a

steep slope

gentle slope

uniform slope

plane surface

Q21 | Direct method of contouring is

a quick method

adopted for large surveys only

most accurate method

suitable for hilly terrains

Q22 | In direct method of contouring, the process of locating or identifying pointslying on a contour is called

ranging

centring

horizontal control

vertical control

Q23 | In the cross-section method of indirect contouring, the spacing of cross-sections depends uponi) contour intervalii) scale of planiii) characteristics of groundThe correct answer is

only (i)

(i)and(ii)

(ii) and (iii)

(i), (ii) and (iii)

Q24 | Which of the following methods of con-touring is most suitable for a hillyterrain ?

direct method

square method

cross-sections method

tacheometric method

Q25 | Select the correct statement.

Contour interval on any map is kept constant.

Direct method of contouring is cheaper than indirect method.

Inter-visibility of points on a contour map cannot be ascertained.

Slope of a hill cannot be determined with the help of contours.