Question 1

What is a map and how do we use it? What are its main components?

Accepted Answer

A map is a representation or drawing of some area viewed from the top. We use maps to locate places and understand how to reach them. The main components of a map are distance, direction, and symbols. — A map shows the surface of an area as if viewed from above. It helps in navigation by showing locations and routes. Distance is shown using scale, direction is indicated by cardinal points (N, E, S, W), and symbols represent various features like buildings, roads, and natural elements.

Question 2

What are coordinates? How can latitude and longitude be used to mark any location on the Earth?

Accepted Answer

Coordinates are a set of numbers that help to locate a place on the Earth's surface. Latitude and longitude are the two coordinates used. Latitude lines run east-west and measure the distance north or south of the Equator. Longitude lines run from the North Pole to the South Pole and measure the distance east or west of the Prime Meridian. By using the latitude and longitude values, any location on Earth can be precisely marked. — Latitude and longitude form a grid over the Earth. Latitude is measured in degrees north or south from the Equator (0°), and longitude is measured in degrees east or west from the Prime Meridian (0°). The intersection of a latitude and longitude line gives the exact position of a place.

Question 3

How are local time and standard time related to longitude?

Accepted Answer

Local time varies according to the longitude of a place because the Earth rotates 360° in 24 hours, meaning it rotates 15° every hour. Standard time is the time set for a particular region or country based on a standard meridian. The difference in longitude between two places causes a difference in local time. Standard time helps to avoid confusion caused by varying local times. — Since the Earth rotates 15° longitude every hour, every 1° longitude corresponds to 4 minutes difference in time. Local time is based on the position of the sun at a place, so it changes continuously with longitude. Standard time is fixed for a region using a central meridian to maintain uniformity.

Question 4

On the map in Fig. 1.1 given on page 8 —
1. Mark the hospital.
2. What is the meaning of the blue-coloured areas?
3. Which is farther away from the railway station — the school, the Nagar Panchayat or the public garden?

Accepted Answer

1. The hospital should be marked at the location shown on the map Fig. 1.1 (as per the symbol for hospital).
2. The blue-coloured areas on the map represent water bodies such as lakes or ponds.
3. By observing the map, the Nagar Panchayat is farther away from the railway station compared to the school and the public garden. — 1. The hospital is identified by its specific symbol on the map.
2. Blue colour on maps typically indicates water features.
3. Distance can be estimated by comparing the relative positions on the map; Nagar Panchayat lies farther from the railway station than the other two places.

Question 5

As a class activity, form groups of three or four students each. Let each group try to draw a map of your school and some of the streets or roads that lead to it, and a few neighbouring buildings. At the end, compare all the maps and discuss.

Accepted Answer

Students should collaborate to draw a map of their school area including streets and nearby buildings. After drawing, they should compare the maps to understand different perspectives and improve their mapping skills. — This activity helps students practice map drawing, understand spatial relationships, and learn about map components like symbols, scale, and direction.

Question 6

Draw a simple map of a school's playground. Let us assume it is a rectangle, 40 m in length and 30 m in width. Draw it precisely with your ruler on a scale of 1 cm = 10 m.

Now measure the diagonal of the rectangle. How many centimetres do you get? Using the scale, calculate the real length of the playground's diagonal, in metres.

Accepted Answer

Step 1: Draw a rectangle with length 40 m and width 30 m on a scale of 1 cm = 10 m.
Length on paper = 40 m ÷ 10 = 4 cm
Width on paper = 30 m ÷ 10 = 3 cm

Step 2: Measure the diagonal on the drawing using a ruler.
Using Pythagoras theorem, diagonal (d) = √(length² + width²) = √(40² + 30²) = √(1600 + 900) = √2500 = 50 m

Step 3: On the drawing, diagonal length = √(4² + 3²) = √(16 + 9) = √25 = 5 cm

Step 4: Using the scale 1 cm = 10 m, real diagonal length = 5 cm × 10 m/cm = 50 m. — The diagonal of a rectangle is calculated using Pythagoras theorem. The scale converts real distances to map distances and vice versa. Measuring the diagonal on the map and then converting it back using the scale gives the actual diagonal length.

Question 7

Consider the map of the small city again. Identify the correct and incorrect statements in the list below:
1. The market is north of the hospital.
2. The museum is southeast of the bank.
3. The railway station is northwest of the hospital.
4. The lake is northwest of the apartment blocks.

Accepted Answer

1. The market is north of the hospital. - Correct
2. The museum is southeast of the bank. - Correct
3. The railway station is northwest of the hospital. - Incorrect (It is southwest)
4. The lake is northwest of the apartment blocks. - Correct — By observing the map (Fig. 1.1), the relative positions of the places can be checked against the statements. Directions are determined using the cardinal points shown on the map.

Question 8

Taking your school as the starting point, do you know approximately in which cardinal direction your home is located? Discuss with your teacher and your parents.

Accepted Answer

Students should identify the approximate cardinal direction (North, East, South, West or intermediate directions) of their home from their school by observation or asking family members. This helps in understanding directions practically. — This question encourages students to apply the concept of cardinal directions in their daily life and develop spatial awareness.

Question 9

Returning to page 10 and to Fig. 5.2 in Chapter 5 of this textbook, taking the scale to be 2.5cm = 500km, calculate the real distance from the estuary of the Narmada River to the estuary of the Ganga river. (Hint: round off your measurement on the map to an easy number.)

Accepted Answer

To calculate the real distance, first measure the distance between the estuary of the Narmada River and the estuary of the Ganga River on the map using a ruler. Suppose the measured distance is x cm. Using the scale 2.5 cm = 500 km, the real distance D = (x / 2.5) * 500 km. Round off the measurement x to an easy number before calculation. For example, if the measured distance is 5 cm, then D = (5 / 2.5) * 500 = 2 * 500 = 1000 km. — Step 1: Measure the distance on the map between the two estuaries in cm.
Step 2: Use the scale 2.5 cm = 500 km to convert the map distance to real distance.
Step 3: Calculate real distance = (measured distance / 2.5) * 500 km.
Step 4: Round off the final answer to a convenient number.

Question 10

Why is it 5:30 pm in India when it is 12 pm or noon in London?

Accepted Answer

India follows Indian Standard Time (IST), which is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT) or London time. This is because India is located east of the Prime Meridian, and the time difference corresponds to the longitude difference. Hence, when it is 12 pm (noon) in London, it is 5:30 pm in India. — The Earth is divided into 24 time zones, each covering 15 degrees of longitude. London is at 0° longitude (Prime Meridian), and India’s standard meridian is 82.5°E. The time difference is (82.5/15) = 5.5 hours ahead of GMT. Therefore, India is 5 hours 30 minutes ahead of London time.

Question 11

Why do we need symbols and colours in the map?

Accepted Answer

Symbols and colours are used in maps to represent different features such as rivers, mountains, roads, forests, and cities in a simple and clear way. They help in easy identification and understanding of the map without cluttering it with long descriptions. — Maps cover large areas and contain many features. Using symbols and colours makes the map easier to read and interpret quickly. For example, blue colour is used for water bodies, green for forests, and specific symbols for airports or temples.

Question 12

Find out what you have in the eight directions from your home or school.

Accepted Answer

This is a personal activity. The student should observe and note down what is located in the eight directions (North, North-East, East, South-East, South, South-West, West, North-West) from their home or school. For example, North: a park; East: a market; South: a river, etc. — The student should use a compass or the sun’s position to identify directions and then note the landmarks or features in each direction from their location.

Question 13

What is the difference between local time and standard time? Discuss it in groups, with each group writing an answer in 100 to 150 words. Compare the answers.

Accepted Answer

Local time is the time based on the position of the sun at a particular place, which varies from place to place depending on longitude. Standard time is the uniform time adopted for a whole region or country based on a standard meridian. For example, India follows Indian Standard Time (IST) based on 82.5°E longitude, which is the same throughout the country regardless of local time differences. — Local time changes continuously as one moves east or west because the sun rises and sets at different times. To avoid confusion, countries adopt a standard time based on a chosen meridian so that the entire region follows the same time.

Question 14

Delhi’s and Bengaluru’s latitudes are 29°N and 13°N; their longitudes are almost the same, 77°E. How much will be the difference in local time between the two cities?

Accepted Answer

Since both cities have almost the same longitude (77°E), their local time difference is negligible or zero. Local time difference depends on longitude difference, not latitude. Therefore, the difference in local time between Delhi and Bengaluru is approximately 0 minutes. — Local time varies with longitude because Earth rotates 360° in 24 hours, so 15° longitude corresponds to 1 hour difference. Since Delhi and Bengaluru share the same longitude, their local times are the same despite different latitudes.

Question 15

Mark the following statements as true or false; explain your answers with a sentence or two.
→ All parallels of latitude have the same length.
→ The length of a meridian of longitude is half of that of the Equator.
→ The South Pole has a latitude of 90°S.
→ In Assam, the local time and the IST are identical.
→ Lines separating the time zones are identical with meridians of longitude.
→ The Equator is also a parallel of latitude.

Accepted Answer

1. False. Parallels of latitude vary in length; only the Equator is the longest.
2. True. A meridian runs from pole to pole, half the circumference of the Earth, while the Equator is the full circumference.
3. True. The South Pole is at 90°S latitude.
4. False. Assam is far east in India, so local time is ahead of IST.
5. True. Time zones are generally divided by meridians of longitude.
6. True. The Equator is the 0° parallel of latitude. — 1. Parallels closer to poles are shorter than the Equator.
2. Meridians run pole to pole, half the Earth's circumference.
3. Latitude 90°S is the South Pole.
4. Assam's local time is ahead of IST due to longitude difference.
5. Time zones are based on meridians.
6. Equator is the main parallel at 0° latitude.

India and the THEME B

India and the THEME B — Study Notes

Introduction

Theme A – India and the World: Land and the People

Theme B – Tapestry of the Past

Practice Questions — India and the THEME B

All 14 Chapters in Exploring Society India and Beyond