# GIS Questions and Answers – Grid Systems

This set of GIS Multiple Choice Questions & Answers (MCQs) focuses on “Grid Systems”.

1. What type of values is used in grid maps?
a) Linear Values
b) Angular Values
c) Varying Values
d) Semi-Angular Values

Explanation: A Grid system has certain advantages over the use of geographical coordinates. Firstly, every grid square is of the same size and shape. Secondly, linear values can be used rather than angular values.

2. The computations of reference azimuth and survey coordinates distance can be easily done in the grid system. True or false?
a) True
b) False

Explanation: A rectangular grid system is required for the army and for engineering and cadastral maps. The computations of reference azimuth and survey coordinates distance can be easily done in this system and a brief, precise, unique and convenient map references can be given.

3. Which grid system is adopted in India?
a) Lambert Grid System
b) Universal Transverse Mercator Coordinate System
c) Indian Grid System
d) Modular Grid System

Explanation: A series of eight Lambert Grids cover India and Burma which are named as I, IIA, IIB, IIIA, IIIB, IVA, IVB and O.

4. Which is the only conformal projection on which Lambert Grid System represents equal and perfect squares?
a) Lambert Conformal Cylindrical Projection
b) Lambert Conformal Conical Projection
c) Lambert Conformal Azimuthal Projection
d) Lambert Conformal Circular Projection

Explanation: The grid squares in this system can be superimposed on any conformal projection. However, it is only on the Lambert conformal conical projection that they represent equal and perfect squares.

5. On the polyconic maps of Survey of India, the grid squares appear as squares, but they may differ by as much as:
a) 1 in 924
b) 1 in 824
c) 1 in 724
d) 1 in 524

Explanation: The N -S extent of the grid is limited to 8 degrees in order to limit the maximum scale error to 1 in 824.

6. How many North to South zones are there in the world for UTM grid system?
a) 40
b) 80
c) 60
d) 50

Explanation: Each zone covers a 60 – wide strip of Longitude. The zones are numbered consecutively, beginning at zone 1 between 1800 and 1740 west to zone 60 between 1740 and 1800 east longitude.

7. Each element in the UTM system is uniquely identified by specifying:
a) a letter
b) a number
c) a letter and a number
d) a roman numeral

Explanation: The zones are numbered consecutively, beginning at zone 1 to zone 60. Each zone is then divided into 19 segments with an 8° difference in latitude plus an additional segment at the extreme north with a 12° difference in latitude. The rows of these segments are lettered from south to north by the letters C through X.

8. Transformation formulae from one zone to another are uniform throughout the UTM grid system. True or false?
a) True
b) False

Explanation: Uniform transformation formulae helps in easy programming for the computer eliminating the need for auxiliary tables based on manual computations.

9. The central meridian of each zone in UTM grid system is assigned the false easting value of:
a) 5000000 m
b) 5000 m
c) 50000 m
d) 500000 m

Explanation: The central meridian of each zone is assigned the false easting value of 500,000 m. This is done to avoid negative numbers at the western edge of the zone.

10. What is the unit of the coordinates in UTM grid system?
a) Meters
b) Centimeters
c) Millimeters
d) Kilometers

Explanation: In the UTM grid system, within each zone, the location of a point is made by specifying its X coordinate, the easting and its Y coordinate, the northing. The unit of the coordinates is meters.

Sanfoundry Global Education & Learning Series – GIS.

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