Surveying MCQs Set-4

Page 1 of 4

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

increasing the viscosity of liquid

decreasing the radius of curvature of tube

increasing the diameter of the tube

decreasing the length of bubble

2. Dumpy level is most suitable when

fly levelling is being done over long distance

all of these

the instrument is to be shifted frequently

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

3. Cross staff is an instrument used for

none of these

setting out right angles

measuring bearings of the lines

measuring approximate horizontal angles

4. 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

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

tacheometry

plane table surveying

trigonometrical levelling

theodolite surveying

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

declination

magnetic bearing

local attraction

azimuth

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

increases

decreases

none of these

remains unaffected

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

45°

30°

60°

90°

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

two

four

three

one

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

eastern side of the true meridian

none of these

southern side of the true meridian

western side of the true meridian

Page 2 of 4

11. The correction for sag is

always additive

always zero

sometimes additive and sometimes subtractive

always subtractive

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

cross staff

steel tape

line ranger

optical square

13. 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

20°

50°

160°

230°

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

foresight and backsight

backsight only

foresight only

foresight and intermediate sight

15. A building is an obstacle to

neither chaining nor ranging

ranging but not chaining

chaining but not ranging

both chaining and ranging

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

10m

2m

20m

5m

17. Contour interval is

the horizontal distance between two points on same contour

the vertical distance between two consecutive contours

the vertical distance between two points on same contour

the horizontal distance between two consecutive contours

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

is easier to handle

can be easily repaired in the field

is lighter than chain

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

19. The length of a chain is measured from

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

outside of one handle to outside of other handle

20. The prismatic compass and surveyor's compass

both give WCB of a line

both give QB of a line

both give QB of a line and WCB of a line

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

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21. The rise and fall method

quicker and less tedious for large number of intermediate sights

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

22. Normal tension is that pull which

neutralizes the effect due to pull and sag

is used at the time of standardising the tape

makes the correction due to pull equal to zero

makes the correction due to sag equal to zero

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

cross-sections method

square method

tacheometric method

direct method

24. Benchmark is established by

trigonometrical levelling

hypsometry

barometric levelling

spirit levelling

25. Contour interval is

directly proportional to the flatness of ground

larger for accurate works

inversely proportional to the scale of the map

larger if the time available is more

26. Three point problem can be solved by

Lehman's method

all of these

Bessels method

Tracing paper method

27. A series of closely spaced contour lines represents a

steep slope

plane surface

gentle slope

uniform slope

28. Subtense bar is an instrument used for

measurement of angles

measurement of horizontal distances in undulated areas

levelling

measurement of horizontal distances in plane areas

29. Agate cap is fitted with a

chain

cross staff

level

prismatic compass

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

205°

S 25° E

295°

335°

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31. The allowable length of an offset depends upon the

scale of plotting

degree of accuracy required

all of these

method of setting out the perpendiculars and nature of ground

32. Local attraction in compass surveying may exist due to

presence of magnetic substances near the instrument

incorrect levelling of the magnetic needle

loss of magnetism of the needle

friction of the needle at the pivot

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

more accurate than rise and fall method

quicker and less tedious for large number of intermediate sights

less accurate than rise and fall method

none of these

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

none of these

more than true R.L

less than true R.L

true R.L

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

none of these

plain surface

hillock

depression

36. The maximum tolerance in a 20m chain is

±2mm

±3mm

±8mm

±5mm

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

river

none of these

hillock

building

38. In the prismatic compass

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

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

the magnetic needle moves with the box

39. Theodolite is an instrument used for

measurement of vertical angles only

measurement of both horizontal and vertical angles

tightening the capstan-headed nuts of level tube

measurement of horizontal angles only

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

all of these

straightening the links

removing one or more small circular rings

closing the joints of the rings if opened out

Surveying MCQs Set-4

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