The Mapping

1. What is the most accurate method of representing relief features? [Jharkhand P.C.S. (Pre) 2013]

(a) Contours
(b) Hachures
(c) Layer colouring
(d) Hill shading

Correct Answer: (a) Contours

Solution:Contours are an effective device for representing relief on topographic maps. They can be defined as an imaginary line connecting points of equal elevation on the ground surface. When contours are close together, they represent a steep slope, whereas when contours are far from each other, they represent a gradual slope.

2. The line joining the areas having the same rainfall is called: [M.P. P.C.S. (Pre) 2015]

(a) Isobar
(b) Isohyet
(c) Isotherm
(d) Isohaline

Correct Answer: (b) Isohyet

Solution:The line drawn on the map joining the same amount of rainfall is called Isohyet. Isobar or Isobaric line is a line drawn on the map joining the places of same atmospheric pressure at mean sea level. An Isotherm is a line drawn on a map joining places of same temperature at Mean Sea level. Isohaline is a line on a map joining places of same salinity in the oceans.

3. Daily weather map showing isobars is an example of: [I.A.S. (Pre) 1997]

(a) Choropleth map
(b) Isopleth map
(c) Chorochromatic map
(d) Choroschematic map

Correct Answer: (b) Isopleth map

Solution:An Isopleth map generalizes and simplifies data with continuous distribution. It shows the data as the third dimension on the map. Thus, isopleth maps are more common for mapping surface elevation, amounts of precipitation, atmospheric pressure and numerous other measurement that can be viewed statistically as a third dimension. It is an example of a daily weather map.

4. Isogonic lines are: [U.P. Lower Sub. (Pre) 1998]

(a) Same atmospheric pressure lines
(b) Same temperature lines
(c) Same salinity lines
(d) Same magnetic declination line

Correct Answer: (d) Same magnetic declination line

Solution:An imaginary line or a line on a map joining points on the Earth's surface at which the magnetic declination is the same called, isogonal.

5. Isobaths are used to show- [Chhattisgarh P.C.S. (Pre) 2003]

(a) Rainfall
(b) Pressure
(c) Time
(d) Depth

Correct Answer: (d) Depth

Solution:

An imaginary line representing points of equal depth under water surface is called Isobath in mapping.

6. Consider the map given below: [I.A.S. (Pre) 1994]

(a) Thomas Cook
(b) Ferdinand Magellan
(c) John Cabot
(d) Vasco da Gama

Correct Answer: (b) Ferdinand Magellan

Solution:The map shows the sea voyage route followenth by (World traveller) Ferdinand Magellan. Ferdinand Magellan was a Portuguese explorer (1480-1521) who completed the first circumnavigation of the Earth.