Surveying MCQs Set-4

Page 1 of 4

1. If the fore bearing of a line AB is 35° and that of line BC is 15, then the included angle between the lines is

50°

20°

230°

160°

2. With the rise of temperature, the sensitivity of a bubble tube

decreases

none of these

increases

remains unaffected

3. Contour interval is

inversely proportional to the scale of the map

larger for accurate works

larger if the time available is more

directly proportional to the flatness of ground

4. Which of the following is an obstacle to chaining but not to ranging?

none of these

river

building

hillock

5. The maximum tolerance in a 20m chain is

±3mm

±2mm

±8mm

±5mm

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

decreasing the radius of curvature of tube

increasing the diameter of the tube

decreasing the length of bubble

increasing the viscosity of liquid

7. The correction for sag is

always zero

sometimes additive and sometimes subtractive

always subtractive

always additive

8. The horizontal angle between the true meridian and magnetic meridian at a place is called

azimuth

declination

magnetic bearing

local attraction

9. If the quadrantal bearing of a line is N25°W, then the whole circle bearing of the line is

335°

205°

295°

S 25° E

10. Closed contours, with higher value inwards, represents a

depression

plain surface

none of these

hillock

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11. The suitable contour interval for a map with scale 1: 10000 is

20m

2m

5m

10m

12. Cross staff is an instrument used for

measuring approximate horizontal angles

measuring bearings of the lines

setting out right angles

none of these

13. Theodolite is an instrument used for

tightening the capstan-headed nuts of level tube

measurement of horizontal angles only

measurement of vertical angles only

measurement of both horizontal and vertical angles

14. A building is an obstacle to

chaining but not ranging

ranging but not chaining

neither chaining nor ranging

both chaining and ranging

15. For accurate work, the steel band should always be used in preference to chain because the steel band

can be easily repaired in the field

is lighter than chain

is practically inextensible and is not liable to kinks when in use

is easier to handle

16. The prismatic compass and surveyor's compass

both give QB of a line

both give WCB of a line

give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively

both give QB of a line and WCB of a line

17. A series of closely spaced contour lines represents a

uniform slope

plane surface

steep slope

gentle slope

18. Three point problem can be solved by

Bessels method

all of these

Lehman's method

Tracing paper method

19. Benchmark is established by

spirit levelling

barometric levelling

hypsometry

trigonometrical levelling

20. The type of surveying which requires least office work is

theodolite surveying

tacheometry

plane table surveying

trigonometrical levelling

Page 3 of 4

21. Which of the following is not used in measuring perpendicular offsets?

optical square

steel tape

line ranger

cross staff

22. Which of the following methods of contouring is most suitable for a hilly terrain?

cross-sections method

square method

direct method

tacheometric method

23. The angle of intersection of the two plane mirrors of an optical square is

60°

90°

30°

45°

24. The rise and fall method

provides a check on the reduction of intermediate point levels

is less accurate than height of instrument method

is not suitable for levelling with tilting levels

quicker and less tedious for large number of intermediate sights

25. The allowable length of an offset depends upon the

scale of plotting

all of these

degree of accuracy required

method of setting out the perpendiculars and nature of ground

26. Subtense bar is an instrument used for

measurement of horizontal distances in undulated areas

levelling

measurement of angles

measurement of horizontal distances in plane areas

27. The number of horizontal cross wires in a stadia diaphragm is

four

one

three

two

28. In the prismatic compass

the magnetic needle moves with the box

the magnetic needle and graduated circle do not move with the box

the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction

the line of the sight does not move with the box

29. The following sights are taken on a "turning point"

foresight and intermediate sight

backsight only

foresight only

foresight and backsight

30. A negative declination shows that the magnetic meridian is to the

eastern side of the true meridian

none of these

western side of the true meridian

southern side of the true meridian

Page 4 of 4

31. Agate cap is fitted with a

prismatic compass

chain

level

cross staff

32. Normal tension is that pull which

makes the correction due to sag equal to zero

makes the correction due to pull equal to zero

is used at the time of standardising the tape

neutralizes the effect due to pull and sag

33. Local attraction in compass surveying may exist due to

presence of magnetic substances near the instrument

loss of magnetism of the needle

incorrect levelling of the magnetic needle

friction of the needle at the pivot

34. For a line AB

both are correct

the fore bearing of AB and back bearing of AB differ by 180°

the fore bearing of AB and back bearing of BA differ by 180°

none of them is correct

35. If the staff is not held vertical at a leveling station, the reduced level calculated from the observation would be

true R.L

none of these

less than true R.L

more than true R.L

36. If the length of a chain is found to be short on testing, it can be adjusted by

closing the joints of the rings if opened out

straightening the links

removing one or more small circular rings

all of these

37. Dumpy level is most suitable when

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

the instrument is to be shifted frequently

fly levelling is being done over long distance

all of these

38. The length of a chain is measured from

outside of one handle to outside of other handle

centre of one handle to centre of other handle

outside of one handle to inside of other handle

inside of one handle to inside of other handle

39. Contour interval is

the horizontal distance between two consecutive contours

the horizontal distance between two points on same contour

the vertical distance between two points on same contour

the vertical distance between two consecutive contours

40. Height of instrument (H.I) method of levelling is

less accurate than rise and fall method

more accurate than rise and fall method

none of these

quicker and less tedious for large number of intermediate sights

Surveying MCQs Set-4

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