# Samacheer Kalvi 9th Social Science Geography Solutions Chapter 7 Pdf

## Samacheer Kalvi 9th Social Science Geography Solutions Chapter 7 Pdf

Tamilnadu Board Samacheer Kalvi 9th Social Science Geography Solutions Chapter 7: Tamilnadu State Board Solution Class 9 Social Science Geography Chapter 7 – Mapping Skills.

### Samacheer Kalvi 9th Social Science Geography Solutions Chapter 7: Overview

 Board Samacheer Kalvi Class 9 Subject Social Science (Geography) Chapter 7 Chapter Name Mapping Skills

### Samacheer Kalvi 9th Social Science Geography Solutions Chapter 7 Mapping Skills

1.) Title indicates the purpose or theme of the map.

a) Title

b) Scale

c) Direction

d) Legend

2.) Standard symbols that are used in maps to convey a definite meaning are called conventional signs and symbols

a) conventional signs and symbols

b) coordinates

c) grid references

d) directions

3.) GPS consists of a constellation of 24 satellites.

a) 7

b) 24

c) 32

d) 64

II.) Match the following

1.) The art and science of mapping                 – c) Cartography

2.) Actual shape of the earth                           – b) Geoid

3.) NAVSTAR                                                            – a) USA

III.) Consider the given statements and choose the right option given below

1.) Assertion (A): The points at which the vertical and horizontal lines of the grid intersect are called coordinates.

Reason (R): The lines that run horizontally and vertically are called Northings and Eastings respectively.

(a) Both (A) and (R) are true ; (R) explains (A)

(b) Both (A) and (R) are true ; (R) does not explain (A)

(c) (A) is correct ; (R) is false

(d) (A) is false ; (R) is true

Answer: Both (A) and (R) are true ; (R) explains (A)

2.) Assertion (A) The legend of a map does not help us to understand the information in a map.

Reason (R) It is usually placed at the left or right corner at the bottom of the map.

(a) (A) is false ; (R) is true

(b) Both (A) and (R) are true ; (R) does not explain (A)

(c) (A) is correct ; (R) is false

(d) Both (A) and (R) are true ; (R) explains (A)

Answer:(A) is false ; (R) is true

1.) What is map?

Answer: The miniature image of the three-dimensional surface of the earth on a paper/cloth or any flat surface is called map.

2.) What are the components of map?

Answer: A map have title, scale, direction, grid, system, projection, legend, conventional signs and symbols.

3.) The distance between two cities A and B is 5 km. It is represented by a line of 5 cm on themap. Calculate the distance and give the answer in RF.

Answer: Distance between two cities 5 km,

Distance represented on the map with line 5cm.

Representative Fraction =Distance on the map/distance on the ground

RF=5/5=1

1 km = 10000 cm

Hence RF is 1:10000

4.) Mention a few surveying instruments.

Answer:Prismatic compass, chain, plane table, Abney level, dumpy level, Clinometre, theodolite, total station and GNSS these are some instruments for survey.

5.) Define remote sensing.

Answer:Remote means far away and sensing means observing or collection information. The process of gathering information from the distance using variety of tools and methods is known as Remote sensing.

6.) What are the components of remote sensing?

Answer:The components of remote sensing are energy source, transmission path, target and sensor.

V.) Give Reasons

1.) Satellite imageries stimulate map making.

Answer: Satellite imageries stimulate map making because of advancement of the technology the satellites are acquiring maximum amount of data with maximum details.

2.) Map is the basic tool of a geographer.

Answer: Map is the basic tool of geographer because it illustrates the surface of the earth clearly and effectively through combination of drawings, words, and symbols.

3.) Grid references are essential to find the exact location of places on a map.

Answer: Grid references are essential to find the exact location for places on a map because the location of a place defined by it latitude and longitude. The latitude and longitude of a place can be expressed in units of degree, minutes and seconds.

VI.) Distinguish Between the Following

1.) Globe and Map

 Globe Map The whole earth is known as globe. Map represents the physical features of globe. Latitudes and longitudes are shown as circular lines. Latitude and longitudes shown by grid in maps. Globe is three dimensional. Map is two dimensional. Globe is not much detailed. Map has very detailed information.

2.) Aerial photographs and satellite imageries.

 Aerial photographs Satellite imageries Aerial photography planned and executed in short time. Satellite takes years of plan, satellite building, testing and launching hence it is costly. Aircraft takes time to capture area by flying again and again. Satellite collects large data in short time of the same area. To take aerial photographs it requires permission of local authority. Satellite imageries are global hence no need of permission. Revisiting and repeating takes extra cost. Revisiting and repeating is easy. It is analogue record where improvement is possible after obtaining photographs. Information is digital here and integrated with software for image improvement.

3.) GIS and GPS.

 GIS GPS GIS stands for Geographical Information System. Global Positioning System. GIS is combination of computer software and hardware which helps to manage large amount through remote sensing. GPSis network of 24 US satellites in six different orbits in space flying 20,350 km above the surface of the Earth. In GIS the main thing is location which coordinate, an address or a distance from a known point that helps to connect the information to a particular location on a map. GPS receivers are available in different shapes and sizes. Many of them are the size of Cellular phone.

1.) What do you mean by the term ‘scale of the map’? Explain its classification.

Answer: It becomes easy to reduce the size of the earth due to scaling and we can draw on a paper. Scale is nothing but the ratio between actual distance on the map to the actual distance on the ground. There are three methods of scaling i) Statement ii) Representative Fraction (RF) iii) Linear or Graphical scale methods.

i) Statement Scale: Statement scale shows the connection of map distance to ground distance in words, like one centimetre to ten kilometres etc. It is shown like 1cm-10km.

ii) The Representative Fraction: The Representative Fraction is actually proportion of the map distance to ground distance. It shown like 1/100000 or 1:100000 it means 1 unit is 100000. This unit could be in inch or centimetre or any other linear measurement unit.

The formula of Representative Fraction is

Representative Fraction (RF) = Distance on the map / Distance on the Ground.

iii) Linear (Graphical) Scale: A linear scale can be shown in the map by a straight line divided into equal parts. Linear or Graphical scale represent the actual ground. This scale help to direct measurement of distance on the map.

2.) Write a note on directions with relevant diagram.

Answer: Normally the orientation of the map is north. North is always up to the north pole of the earth. If we stand on the North pole then at the right side there will be east and at the left side there will be west and South will be at back. These four directions are known as cardinal directions. On the map North-South lines indicates direction, an arrow shows the North direction.

3.) Explain the major uses of GPS? Explain about any one.

Answer: GPS is basically network of 24 US satellites in six different orbits in space. They are flying around 20350 km above the surface of the earth. GPS used in many applications like mobile phones, watches, bulldozers, shipping containers ATM etc. It provides accurate transport data like distance, route and direction. It also helps is searching and rescuing. GPS also help speeding up emergency services and disaster relief. Another use of GPS is weather forecasting, earthquake monitoring and environmental protection.

Mobile phone is the best example of using GPS. Using mobile phone we can monitor direction, check route and distance. It also helps us to find anything in the map. By using few extra software it is also possible to get information about weather, earthquake and environment.

Updated: July 20, 2021 — 11:16 pm