GATE Questions & Answers of Surveying Civil Engineering

An observer standing on the deck of a ship just sees the top of a lighthouse. The top of the lighthouse is 40 m above the sea level and the height of the observer’s eye is 5 m above the sea level. The distance (in km, up to one decimal place) of the observer from the lighthouse is ____________

The minimum number of satellites needed for a GPS to determine its position precisely is

The system that uses the Sun as a source  of electromagnetic energy and records the naturally radiated and reflected energy from the object is called

The staff reading taken on a workshop floor using a level is 0.645 m. The inverted staff reading taken to the bottom of a beam is 2.960 m. The reduced level of the floor is 40.500 m. The reduced level (expressed in m) of the bottom of the beam is

The vertical angles subtended by the top of a tower T at two instrument stations set up at P and Q, are shown in the figure. The two stations are in line with the tower and spaced at a distance of 60 m. Readings taken from these two stations on a leveling staff placed at the benchmark (BM = 450.000 m) are also shown in the figure. The reduced level of the top of the tower T (expressed in m) is _________

Optimal flight planning for a photogrammetric survey should be carried out considering

The reduced bearing of a 10 m long line is N30°E. The departure of the line is

A circular curve of radius R connects two straights with a deflection angle of 60°. The tangent length is

A tall tower was photographed from an elevation of 700 m above the datum. The radial distances of the top and bottom of the tower from the principal points are 112.50 mm and 82.40 mm, respectively. If the bottom of the tower is at an elevation 250 m above the datum, then the height (expressed in m) of the tower is _________

Which of the following statements is FALSE ?

In a closed loop traverse of 1 km total length, the closing errors in departure and latitude are 0.3 m and 0.4 m, respectively. The relative precision of this traverse will be:

In a survey work, three independent angles $ X,Y $ and $ Z $ were observed with weights $ W_{x,}\;W_{y,}\;W_y $ respectively. The weight of the sum of angles $ X,Y $ and $ Z $ is given by:

In a region with magnetic declination of 2ºE, the magnetic Fore bearing (FB) of a line AB was measured as N79º50' E. There was local attraction at A. To determine the correct magnetic bearing of the line, a point O was selected at which there was no local attraction. The magnetic FB of line AO and OA were observed to be S52º40'E and N50º20'W, respectively. What is the true FB of line AB ?

In a leveling work, sum of the Back Sight (B.S.) and Fore Sight (F.S.) have been found to be 3.085 m and 5.645 m respectively. If the Reduced Level (R.L.) of the starting station is 100.000 m, the R.L. (in m) of the last station is ______

The combined correction due to curvature and refraction (in m) for a distance of 1 km on the surface of Earth is

The bearings of two inaccessible stations, S1 (Easting 500 m, Northing 500 m) and S2 (Easting 600 m, Northing 450 m) from a station S3 were observed as 225o and 15326' respectively. The independent Easting (in m) of station S3 is:

Two Pegs A and B were fixed on opposite banks of a 50 m wide river. The level was set up at A and the staff readings on Pegs A and B were observed as 1.350 m and 1.550 m, respectively. Thereafter the instrument was shifted and set up at B. The staff readings on Pegs B and A were observed as 0.750 m and 0.550 m, respectively. If the R.L. of Peg A is 100.200 m, the R.L. (in m) of Peg B is ______.

Group I lists tool/instrument while Group II lists the method of surveying. Match the tool/instrument with the corresponding method of surveying.

Group I            Group II
P. Alidade            1. Chain surveying
Q. Arrow            2. Levelling
R. Bubble tube            3. Plain table surveying
S. Stadia hair                     4. Theodolite surveying

The survey carried out to delineate natural features, such as hills, rivers, forests and man-made features, such as towns, villages, buildings, roads, transmission lines and canals is classified as

A tacheometer was placed at point P to estimate the horizontal distances PQ and PR. The corresponding stadia intercepts with the telescope kept horizontal, are 0.320 m and 0.210 m, respectively. The QPR is measured to be 61° 30' 30". If the stadia multiplication constant = 100 and stadia addition constant = 0.10 m, the horizontal distance (in m) between the points Q and R is _________________

The chainage of the intersection point of two straights is 1585.60 m and the angle of intersection is 140°. If the radius of a circular curve is 600.00 m, the tangent distance (in m) and length of the curve (in m), respectively are

The latitude and departure of a line AB are +78 m and -45.1 m, respectively. The whole circle bearing of the line AB is:

Following bearings are observed while traversing with a compass.

Line Fore Bearing Back Bearing
AB 126°45´ 308°00´
BC 49°15´ 227°30´
CD 340°30´ 161°45´
DE 258°30´ 78°30´
EA 212°30´ 31°45´

After applying the correction due to local attraction, the corrected fore bearing of line BC will be:

A theodolite is set up at station A and a 3 m long staff is held vertically at station B. The depression angle reading at 2.5 m marking on the staffis 6°10´. The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L. of A is 880.88 m.Apply the curvature and refraction correction, and determine the R.L. of B (in m). __________

The observations from a closed loop traverse around and obstacle are


Segment Observation
from station Length(m)

from magnetic north)

PQ P missing 33.75000 QR Q 300.00 86.38470 RS R  354.524 169.38190 ST S 450.000 243.90030 TP T 268.000 317.50000

What is the value of the missing measurement (rounded off to the nearest 10 mm)?

The type of surveying in which the curvature of the earth is taken into account is called

The plan of a survey plotted to a scale of 10 m to 1 cm is reduced in such a way that a line originally 10 cm long now measures 9 cm. The area of the reduced plan is measured as 81 cm2. The actual (m2) of the survey is

The focal length of the object glass of a tacheometer is 200 mm, the distance between the vertical axis of the tacheometer and the optical centre of the object glass is 100 mm and the spacing between the upper and lower line of the diaphragm axis is 4 mm. With the line of collimation perfectly horizontal, the staff intercepts are 1 m (top), 2m (middle), and 3 m (bottom). The horizontal distance (m) between the staff and the instrument station is

A road is provided with a horizontal circular curve having deflection angle of 55o and centre line radius of 250 m. A transition curve is to be provided at each end of the circular curve of such a length that the rate of gain of radial acceleration is 0.3m/s3 at a speed of 50 km per hour. Length of the transition curve required at each of the ends is

The plan of a map was photo copied to a reduced size such that a line originally 100 mm, measures 90 mm. The original scale of the plan was 1 : 1000. The revised scale is

Two straight lines intersect at an angle of 60°. The radius of a curve joining the two straight lines is 600 m. The length of long chord and mid-ordinates in metres of the curve are

Subjects of Geomatics Engineering