List of top Surveying and Mapping Questions asked in GATE GE

A staff is held vertical at a distance of 100 m and 300 m, respectively. Observations are taken with a Tacheometer and staff intercepts, with the telescope kept horizontal, are 0.990 m and 3.000 m, respectively. The theodolite is set over a station having a RL of 950.500 m and the height of instrument is 1.425 m. The multiplicative constant of the Tacheometer is __________________ (round off to 2 decimal places).

Face Left and Face Right observations using a vernier theodolite will eliminate

An instrument is set up at a station P and the angle of depression to a vane, 1.20 m above the foot of the staff held at Q is 5°. The horizontal distance PQ is observed to be 300 m. The R.L. of point Q is __________________ m (round off to 3 decimal places). Given that the staff reading at a BM (Elevation 436.050 m) is 2.865 m.

A map projection is

The parallax of a point ‘a’ on a pair of successive overlapping photographs is 73.22 mm and the micrometer reading of a parallax bar of point ‘a’ is 12.10 mm. Similarly, the micrometer reading of the parallax bar of point ‘b’ is 9.65 mm, then the parallax of the point ‘b’ is __________________ mm (round off to 2 decimal places).

The scale of an aerial photograph is 5 mm = 100 m. The size of the photograph is 23 cm × 23 cm. If the longitudinal overlap is 65% and sidelap is 20%, the number of photographs required to cover an area of 12.5 km × 8 km is __________________ (in integer).

Bowditch rule for adjusting a closed traverse of perimeter ‘l’ is based on the assumption that the probable error is proportional to

A topographic map prepared by Survey of India covers 1 degree by 1 degree area on a single map. The minimum ground distance which can be represented on this map is __________________ m (round off to 2 decimal places).

The camera axis of an aerial camera is defined as

The Degree of Accuracy of a traverse having error of closure of 0.5 m and perimeter of 100 m is __________________ (round off to 3 decimal places).

Height of a station determined by Global Navigational Satellite System (GNSS) is 284.097 m and the geoid height of the station is –30.052 m. The elevation of the station is __________________ m (round off to 3 decimal places).

Satellite-Based NAVSTAR GPS Augmentation System(s) is/are

Identify the CORRECT statement(s)

Identify the CORRECT statement(s).

During GPS Surveying, initialization of rover receiver is required for

How many number of cells of a 30 m spatial resolution DEM would be required to cover a 1:50,000 topographic map of Survey of India, assuming that 1 minute = 1.85 km?

Two surveyors, P and Q measured a 20 m distance six times each, as given below (in m):
Surveyor P: 19.97, 20.02, 20.04, 19.98, 19.96, 20.03
Surveyor Q: 20.05, 20.07, 20.05, 20.06, 20.07, 20.07
On the basis of accuracy and precision of the measured values, choose the CORRECT statement.

Identify the error, which has all the following characteristics:
(i) Caused by observer’s misunderstanding and carelessness
(ii) Reading an angle counter-clockwise, but recording it as clockwise angle
(iii) Sighting the wrong target
(iv) Poor judgment by the observer