Surveying Objective Type Questions and Answers

(21) The error due to eccentricity of inner and outer axes can be eliminated by

[A] reading both verniers and taking the mean of the two of the column

[B] taking both face observations and taking the mean of the two

[C] double sighting

[D] taking mean of several readings distributed over different portions of the graduated circle

Answer: reading both verniers and taking the mean of the two

(22) Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

[A] error due to eccentricity of verniers

[B] error due to displacement of station signals

[C] error due to wrong adjustment of line of collimation and trunnion axis

[D] error due to inaccurate graduation

Answer: error due to displacement of station signals

(23) The adjustment of horizontal cross hair is required particularly when the instrument is used for

[A] leveling

[B] prolonging a straight line

[C] measurement of horizontal angles

[D] all of the above

Answer: leveling

(24) For which of the following permanent adjustments of theodolite, the spire test is used ?

[A] adjustment of plate levels

[B] adjustment of line of sight

[C] adjustment of horizontal axis

[D] adjustment of altitude bubble and vertical index frame

Answer: adjustment of horizontal axis

(25) The cross hairs in the surveying telescope are placed

[A] midway between eye piece and objec¬tive lens

[B] much closer to the eye-piece than to the objective lens

[C] much closer to the objective lens than to the eye piece

[D] anywhere between eye-piece and objective lens

Answer: much closer to the eye-piece than to the objective lens

(26) A telescope is said to be inverted if its

[A] vertical circle is to its right and the bubble of the telescope is down

[B] vertical circle is to its right and the bubble of the telescope is up

[C] vertical circle is to its left and the bubble of the telescope is down

[D] vertical circle is to its left and the bubble of the telescope is up

Answer: vertical circle is to its right and the bubble of the telescope is down

(27) If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

[A] on its outer spindle with a relative motion between the vernier and graduated scale of lower plate

[B] on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate

[C] on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate

[D] on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate

Answer: on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate

(28) Which of the following is not the function of levelling head ?

[A] to support the main part of the instrument

[B] to attach the theodolite to the tripod

[C] to provide a means for leveling the theodolite

[D] none of the above

Answer: none of the above

(29) Size of a theodolite is specified by

[A] the length of telescope

[B] the diameter of vertical circle

[C] the diameter of lower plate

[D] the diameter of upper plate

Answer: the diameter of lower plate

(30) The process of turning the telescope about the vertical axis in horizontal plane is known as

[A] transiting

[B] reversing

[C] plunging

[D] swinging

Answer: swinging

31 Theodolite is an instrument used for

[A] tightening the capstan-headed nuts of level tube

[B] measurement of horizontal angles only

[C] measurement of vertical angles only

[D] measurement of both horizontal and vertical angles

Answer: measurement of both horizontal and vertical angles

32 Agate cap is fitted with a

[A] cross staff

[B] level

[C] chain

[D] prismatic compass

Answer: prismatic compass

33 The graduations in prismatic compass

i) are inverted

ii) are upright

iii) run clockwise having 0° at south

iv) run clockwise having 0° at north

The correct answer is

[A] (i) and (iii)

[B] (i) and (iv)

[C] (ii) and (iii)

[D] (ii) and (iv)

Answer: (i) and (iii)

34 If the magnetic bearing of the sun at a place at noon in southern hemisphere is 167°, the magnetic declination at that place is

[A] 77° N

[B] 23° S

[C] 13° E

[D] 13° W

Answer: 13° E

35 A negative declination shows that the magnetic meridian is to the

[A] eastern side of the true meridian

[B] western side of the true meridian

[C] southern side of the true meridian

[D] none of the above

Answer: western side of the true meridian

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

[A] azimuth

[B] declination

[C] local attraction

[D] magnetic bearing

Answer: declination

37 The prismatic compass and surveyor’s compass

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

[B] both give QB of a line and WCB of a line

[C] both give QB of a line

[D] both give WCB of a line

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

38 In the quadrantal bearing system, a whole circle bearing of 293° 30′ can be expressed as

[A] W23°30’N

[B] N66°30’W

[C] S113°30’N

[D] N23°30’W

Answer: N66°30’W

39 Local attraction in compass surveying may exist due to

[A] incorrect levelling of the magnetic needle

[B] loss of magnetism of the needle

[C] friction of the needle at the pivot

[D] presence of magnetic substances near the instrument

Answer: presence of magnetic substances near the instrument

40 In the double application of principle of reversion, the apparent error is

[A] equal to true error

[B] half the true error

[C] two times the true error

[D] four times the true error

Answer: four times the true error

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