9th Std Social Science Term 3 Solution | Lesson.5 Mapping Skills

Lesson.5 Mapping Skills

Lesson.5 Mapping Skills

I. Choose the correct answer

1. The new phase in topographical surveying in the 20th century is ……………

1. Toposheets
2. Aerial photography
3. Maps
4. Satellite imagery

Ans : b) Aerial photography

2. …………… indicates the purpose of theme of the map.

1. Title
2. Scale
3. Direction
4. Legend

Ans : (a) Title

3. Standard symbols that are used in map to convey a definite meaning are called ……………

1. Conventional signs and symbols
2. Coordinates
3. Grid reference
4. Directions

Ans : a) Conventional signs and symbols

4. Which one of the following maps show us a very large area with less details?

1. Large Scale
2. Thematic
3. Physical
4. Small scale

Ans : a) Large Scale

5. GPS consists of a constellation of …………… satellities.

1. 7
2. 24
3. 32
4. 64

Ans : b) 24

II. 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 Easting respectively.

1. Both A and R are true; (R) explains (A)
2. Both (A) and (R) are true; but (R) does not explain (A)
3. (A) is correct; (R) is false
4. (A) is false; (R) are true.

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

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

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

1. (A) is false; (R) are true.
2. Both (A) and (R) are true; but (R) does not explain (A)
3. (A) is correct; (R) is false
4. Both A and R are true; (R) explains (A)

Ans : a) (A) is false; (R) are true.

III Match the following

IV. Answer the following in brief: 

1. Name the different methods to represent the Earth.

Maps and Globes are the different methods to represent the Earth.

2. What is a map?

• A map is defined as the miniature image of the 3 dimensional earth’s surcace on a paper/ cloth or any flat surface.
• Maps can show a whole or part of the world.

3. What are the components of a map?

The components of the map are

1. Title
2. Scale
3. Direction
4. Grid system
5. Projection
6. Legend
7. Conventional signs
8. Symbols

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

5. Mention a few surveying instruments.

A few surveying instruments are-

1. Chain
2. Prismatic compass
3. Plane table
4. Dumpy level
5. Abney level
6. Clinometre
7. Theodolite
8. Total station
9. GNSS

6. Define : Remote sensing.

• Remote sensing refers to the observation and measurement of earthy objects without touching them.
• ‘Remote’ means far way and ‘Sensing’ means observing or collecting information.
• Remote sensing means acquiring information of things/places from a distance using a various of tools and methods.

7. What are the components of remote sensing?

The components of remote sensing are-

• Energy source
• Transmission path
• Target
• Sensor

V. Give reasons for the following: 

1. Satellite imageries stimulate map making.

• Satellite images which are accurate photographs of the Earth’s surface allow cartographers to precisely determine the location of roads, cities, rivers, and other features on the Earth.
• These images help cartographers create maps that are more accurate than ever before.
• Satellite images are great tools that allow cartographers to stay up-to-date.

2. Map is the basic tool of a geographer.

• Map is a two-dimensional drawing of the earth’s surface. It can be very simple or very detailed.
• It shows natural landmarks like mountains and lakes and also show man-made boundaries like state lines or roads and trails.
• For centuries, maps have been the primary way to record geographic information and the primary way to get around.

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

• The local of a place can be simply defined by its latitude and longitude.
• In normal practice, latitude is started first and then comes the longitude.
• The latitude and longitude of a place can be expressed in units of degree, minutes and seconds

VI. Distinguish between

1. Globe and Map

2. Large scale map and small scale map

3. Aerial photographs and satellite imageries

4. GIS and GPS

VII. Answer in a paragraph:

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

A scale is a ratio between the actual distance on the map to the actual distance on the ground.0 Scale makes it possible to reduce the size of the whole Earth to show it on a piece of paper. Scales can be represented in three methods.

They are

Statement scale:

• The statement scale describes the relationship of map distance to ground distance in words.
• For example, one centimeter is to ten kilometers. It is expressed as 1 cm = 10 km.

Representative Fraction:

• It describes the proportion or ratio of the map distance to ground distance.
• It is usually abbreviated as R.F.
• It is stated as 1/100000 or 1:100000. This means that one unit on the map represents 100,000 of the same unit on the ground.

Liner (or) Graphical scale:

• Liner Scale is represented by a straight line divided into equal parts to show what these markings represent on the actual ground.
• This scale helps in the direction measurement of distance on the map.

2. Write a note on directions with relevant diagram.

• Maps are drawn normally with north orientation.
• North direction in a map is always towards the North Pole of the Earth.
• The top of the map always show the North and the bottom is the South.
• The Four directions such as East, West, North and South are called the Cardinal directions.
• Direction is usually indicated on a map by a North-South line with the North direction represented by an arrow head

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

Major uses of GPS:

• Helps in providing accurate transport data
• Helps in minary searches and rescue in wars
• Acts as a reliable tourist guide
• Helps rescue efforts at the time accidents
• Speeding the delivery of emergency services
• Useful to find the lost vehicles

Disaster relief:

Weather forecasting, earthquake monitoring and environment protection can be done effectively by using GPS. During the time of disaster, relief measures can be taken at the right time and right direction with the help of GPS.

4. Bhavan has tremendous uses for scientists, policy makers and the general public Justify.

• Bhuvan (Sanskrit for Earth) is a free internet based computer application launched by the Indian Space Research Organisation.
• It was launched in 2009 which enables visualization of Indian Remote Sensing images taken over a year ago.
• The Remote sensing images are taken by ISRO’s seven satellites including CartoSat-1 and CartoSat – 2.
• Using Bhuvan, one can explore the places of interest, scenes of events in the news and parts around the world by entering the names or places or co-ordinates.
• Bhuvan has tremendous used for scientists, academicians, policy makers and the general public.

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