Tamil Nadu Board 9th Standard Social Science - Geography Unit 7: Book Back Answers and Solutions
This post covers the book back answers and solutions for Unit 7 – Geography from the Tamil Nadu State Board 9th Standard Social Science textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Geography Unit 7 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 9 students! Prepare well and aim for top scores. Thank you!
Topic: Unit 7. MAPPING SKILL
I. Choose the correct Answer
_________ indicates the purpose or theme of the map.
(a) Title
(b) Scale
(c) Direction
(d) Legend
Answer Key:
(a) Title
Question 2.
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 Key:
(a) conventional signs and symbols
Question 3.
GPS consists of a constellation of satellites.
(a) 7
(b) 24
(c) 32
(d) 64
Answer Key:
b) 24
II. Match the following
1. The art and science of mapping – (a) USA2. Actual shape of the earth – (b) Geoid
3. NAVSTAR – (c) Cartography
Answer Key:
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
Question 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 Key:
(a) Both (A) and (R) are true ; (R) explains (A)
Question 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 Key:
(a) (A) is false ; (R) is true
IV. Distinguish Between
|
1.
GLOBE
|
MAP
|
|
* A globe gives a three dimensional presentation of the entire world. * A globe can be called as a duplicate earth. |
* A map gives a two dimensional presentation of a certain regions of the world. *The symbols and colours used in the maps give us many details. |
|
2.
ARIEAL PHOTOGRAPHS
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SATELLITE
IMAGINERIES
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|
* Takes more time to capture an area Aircraft needs to fly back and forth. * Surveying can be planned in a short time and is economical. |
*Satellites collect large amount of data of the entire area in a short span. *High cost of satellite systems. |
|
3.
GIS
|
GPS
|
|
* GIS stands for Geographical Information System. * GIS is a combination of computer hardware, software, geographic data and the personnel. |
* GPS stands for Global Positioning System. * GPS
converts satellite signals into location, speed ad time data in any time all
over the world. |
V. Answer the following briefly
- A map is a location guide.
- Maps can show either the whole world or a part of the world.
- Title
- Scale
- Direction
- Grid system
- Project
- Legend
- Conventional signs
- Symbols.
- Calculate the distance and give the answer in RF. (Representative Fraction)
- Distance in RF Distance on the map Distance on the ground.
5 cm/5 km = 5/500000
So RF is 5:500000.
- Chain
- Prismatic Compass
- Plane table
- Dumpy level
- Abney level
- Clinometer
- Theodolite
- GNSS.
- Remote sensing means acquiring information about things / places from a distance, using a variety of tools and methods.
- Energy source
- Transmission path
- Target
- Sensor.
VI. Answer all the questions given under each caption
- A scale is a ratio between the actual distance on the map to the actual distance on the ground.
- Scales can be represented in three methods.
- Statement Scale.
- The Representative Fraction
- Linear or Graphical scale method.
Statement scale
- The statement scale describes the relationship of map distance to ground distance in words.
- It expressed as 1cm 10 kms.
The Representative Fraction (R.F)
- It describes the proportion or ratio of the map distance to ground distance.
- Representative Fraction Distance on the map/ Distance on the ground.
Linear (or) Graphical scale:
- In a map, a linear scale is represented by a straight line divided into equal parts to show what these markings represent on the actual ground.
- Maps are drawn normally with orientation to north.
- North direction in a map is always towards the North Pole of the Earth.
- If a person position himself looking at the North Pole, on right will be the east; left will be the west; Back will be the south; These four-main directions 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.
- GPS technology in various applications such as mobile phones, vehicles, shipping containers and ATM s.
- The main purpose of GPS is to help in providing accurate transport data.
- It helps in military searches and rescue persons in wars.
- It can work as a reliable tourist guide.
- GPS helps during accident and rescue efforts, speeding the delivery of emergency services and disaster relief.
- Due to 3D rendering, it gives the impression of moving through real space and time.
- Students can understand subjects from science to history.
- It provides information on nature resources and on disasters.
- Administrators use it for monitoring various developmental schemes.
- Using Bhuvan connected to Internet, one can explore places of interest, by entering the names of places or its coordinates (latitudes and longitudes)
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