Surveying MCQs Set-4

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1. Agate cap is fitted with a

cross staff

prismatic compass

chain

level

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

foresight and backsight

foresight and intermediate sight

foresight only

backsight only

3. A building is an obstacle to

neither chaining nor ranging

ranging but not chaining

chaining but not ranging

both chaining and ranging

4. Dumpy level is most suitable when

the instrument is to be shifted frequently

fly levelling is being done over long distance

all of these

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

5. Local attraction in compass surveying may exist due to

loss of magnetism of the needle

incorrect levelling of the magnetic needle

presence of magnetic substances near the instrument

friction of the needle at the pivot

6. Normal tension is that pull which

is used at the time of standardising the tape

makes the correction due to sag equal to zero

makes the correction due to pull equal to zero

neutralizes the effect due to pull and sag

7. Three point problem can be solved by

Tracing paper method

all of these

Bessels method

Lehman's method

8. Contour interval is

the horizontal distance between two consecutive contours

the vertical distance between two points on same contour

the horizontal distance between two points on same contour

the vertical distance between two consecutive contours

9. Benchmark is established by

barometric levelling

hypsometry

spirit levelling

trigonometrical levelling

10. The maximum tolerance in a 20m chain is

±8mm

±3mm

±2mm

±5mm

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

none of these

less than true R.L

more than true R.L

true R.L

12. The allowable length of an offset depends upon the

scale of plotting

method of setting out the perpendiculars and nature of ground

all of these

degree of accuracy required

13. For a line AB

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

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

both are correct

none of them is correct

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

theodolite surveying

tacheometry

plane table surveying

trigonometrical levelling

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

cross staff

optical square

line ranger

steel tape

16. The prismatic compass and surveyor's compass

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

both give WCB of a line

both give QB of a line

17. 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°

160°

50°

230°

18. Cross staff is an instrument used for

setting out right angles

measuring approximate horizontal angles

measuring bearings of the lines

none of these

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

southern side of the true meridian

eastern side of the true meridian

none of these

western side of the true meridian

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

removing one or more small circular rings

straightening the links

all of these

closing the joints of the rings if opened out

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21. 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 easier to handle

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

is lighter than chain

22. 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

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

plain surface

depression

none of these

hillock

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

205°

295°

335°

S 25° E

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

none of these

decreases

remains unaffected

increases

26. 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

27. The correction for sag is

sometimes additive and sometimes subtractive

always subtractive

always additive

always zero

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

four

two

one

three

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

declination

local attraction

azimuth

magnetic bearing

30. A series of closely spaced contour lines represents a

uniform slope

plane surface

gentle slope

steep slope

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

increasing the viscosity of liquid

increasing the diameter of the tube

decreasing the length of bubble

decreasing the radius of curvature of tube

32. 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 moves with the box

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

33. Contour interval is

larger if the time available is more

directly proportional to the flatness of ground

inversely proportional to the scale of the map

larger for accurate works

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

building

hillock

none of these

river

35. Theodolite is an instrument used for

measurement of vertical angles only

tightening the capstan-headed nuts of level tube

measurement of horizontal angles only

measurement of both horizontal and vertical angles

36. The length of a chain is measured from

outside of one handle to outside of other handle

outside of one handle to inside of other handle

centre of one handle to centre of other handle

inside of one handle to inside of other handle

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

90°

45°

30°

60°

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

direct method

square method

cross-sections method

tacheometric method

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

10m

2m

5m

20m

40. Subtense bar is an instrument used for

levelling

measurement of angles

measurement of horizontal distances in undulated areas

measurement of horizontal distances in plane areas

Surveying MCQs Set-4

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