Samacheer Kalvi 9th Social Science – Geography Unit 7 Book Back Answers:
Samacheer Kalvi 9th Standard New Social Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 9 New Syllabus 2021 to 2022 Book Back Question & Answer available for both English and Tamil Mediums. Class 9 Social Geography Book Unit 7 – Mapping Skills Answers/Solutions are provided on this page. 9th Std Social Science History Book portion consists of 11 units, Geography Book portion consists of 8 units, Civics book portion consists of 6 units, and Economics book portion consists of 5 units, All Social Book Back One, and Two Mark Solutions are given below.
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Samacheer Kalvi 9th Social Science Book Back Solutions PDF:
9th Social Subject 1 Mark and 2 Mark Solutions PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes. Samacheer Kalvi 9th Geography Unit 7 Answers are given below.
Geography Book Back Answers
Unit 7 – Mapping Skills
I. Choose the correct answer.
1. The new phase in topographical surveying in the 20th century is ……
(a) toposheets
(b) aerial photography
(c) maps
(d) satellite imagery
Answer: (d) satellite imagery
2. …… indicates the purpose or theme of the map.
(a) Title
(b) Scale
(c) Direction
(d) Legend
Answer: (a) Title
3. Standard symbols that are used in maps to convey a definite meaning are called ………
(a) conventional signs and symbols
(b) coordinates
(c) grid references
(d) directions
Answer: (a) conventional signs and symbols
4. Which one of the following maps show us a very large area with less details?
(a) Large scale
(b) Thematic
(c) Physical
(d) Small scale
Answer: (d) Small scale
5. GPS consists of a constellation of ……… satellites.
(a) 7
(b) 24
(c) 3.2
(d) 64
Answer: (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 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: (a) 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 comer 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) (A) is false ; (R) is true
III. Match the following:
1. The art and science of mapping – a) USA
2. Actual shape of the earth – b) Cartography
3. NAVSTAR – c) Geoid
Answers:
1. (b)
2. (c)
3. (a)
IV. Answer in brief:
1. Name the different methods to represent the Earth. ‘
Answer:
The three methods in widest use are as follows:
- Projection on the surface of a cylinder
- Projection on to the surface of a cone
- Projection directly onto a flat plane, called planar or zenithal or azimuthal projection.
2. What is a map?
Answer:
A map is the basic tool of a geographer. It illustrates the earth’s surface Clearly and effectively through a combination of drawings, words and symbols. A map is a location guide.
3. What are the components of a map?
Answer:
Title, scale and directions are the three components of a map.
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.
Answer:
Representative Fraction (R.F.) = Distance on the map / Distance on the ground Given, Distance on the map = 5 cm
Distance on the ground = 5 km
∴ R.F. = 5 cm / 5 km
Converting km to cm; 5 km = 500000 cm
So R.F. is 5 : 500000
i.e. R.F. is 1 : 100000
5. Mention a few surveying instruments.
Answer:
Chain, Prismatic compass, Plane table, Dumpy level, Abney level, Clinometre, Theodolite, Total Station and GNSS are some of the surveying instruments.
6. Define remote sensing.
Answer:
Remote Sensing refers to the observation and measurement of earthly objects without touching them. ‘Remote’ means far away and ‘Sensing’ means observing or collecting information. Remote sensing means acquiring information of things/places from a distance, using a variety of tools and methods.
7. What are the components of remote sensing?
Answer:
Components of remote sensing are:
- Energy source
- Transmission path
- Target
- Sensor
V. Give Reasons
1. Satellite imageries stimulate map making.
Answer:
- Satellite imagery refers to digitally transmitted images of the satellites. Therefore it can be easily integrated with software for improvement of images.
- Satellites circle the Earth, or remain geostationary and therefore, changes in weather or any other natural or man made modifications does not affect the functioning of Satellites.
2. Map is the basic tool of a geographer.
Answer:
With maps on hand, one can see the world in one sweep. A map is worth a thousand words. Maps are introduced with its components such as scale, signs and symbols. A map is the basic tool of a geographer. It illustrates the earth’s surface clearly and effectively through a combination of drawings, words and symbols. A map is a location guide.
3. Grid references are essential to find the exact location of places on a map.
Answer:
The location of a place can be simply defined by its latitude and longitude. In normal practice, latitude is stated first and then comes the longitude. The latitude and longitude of a place can be expressed in units of degree, minutes and seconds.
A grid is a set of lines with alphanumeric codes for defining a location on a map in many topographical sheets. The lines that run horizontally from left to right of the map are known as northings, whereas, the lines that run vertically from the top to the bottom of the map are called eastings. The points at which the vertical and horizontal lines of the grid intersect are called coordinates which are identified by numbers or letters.
4. Web cartography is one of the modern mapping techniques.
Answer:
The introduction of web mapping is a major new trend in cartography. The term Web cartography is connected with the design, production, display and use of maps over the Web. Various types of maps are present on the Web. Until recently cartography was restricted as it required relatively expensive and complex hardware and software as well as skilled cartographers and geomatics engineers.
Web based GIS has brought many geographical datasets, including free ones generated by OpenStreetMap and proprietary datasets owned by Navteq, Google, Waze, and others. A range of free software to generate maps has also been conceived and implemented alongside proprietary tools like ArcGIS. As a result, the barrier to entry for serving maps on the web has been lowered.
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