NCERT Solutions-Locating Places on the Earth-Class 6-Social Science

 

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NCERT Solutions Chapter-1 (Locating Places on the Earth) Class 6 Social Science

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1. Returning to page 10 and to Fig. 5.2 in Chapter 5 of this textbook, taking the scale to be 2.5 cm = 500 km, 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.)

Answer: 

Let’s calculate the distance:

First of all, let’s calulate the distance on the map between the estuary of the Narmada River and the Ganga River. Now assume we measure it to be approximately 5.5 cm (rounding off to an easy number).

since the scale is 2.5 cm = 500km, we can set up a proportion to calculate the real distance:

2.5 cm = 500 km

1 cm = 500 km/2.5

1 cm = 200 km

Now convert the measured distance on the map (5.5cm)to real distance:

5.5 cm x 200 km/cm=1100 km

So the real distance from the eastuary of the Narmada River to the eastuary of the Ganga River is approximately 1100 km.

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

Answer: 

In London the Greenwich Mean Time GMT is followed.

The Indian Standard Meridian is located 82 1/2º east of the Prime Meridian.

Thus the Indian Standard Time IST is 5 hours and 30 minutes ahead of GMT.

So when it is 12 noon in London it is 5.30 in India.

3. Why do we need symbols and coloures in the map?

Answer:

It is not possible to draw, on a map, the actual shape and size of different features such as buildings, roads, bridges, trees, railway lines or a well.

So, they are shown by using certain letters, shades, colours, pictures and lines.

These symbols give a lot of information in a limited space.

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

Answer: Do youself as the direction of your Home to School.

For Example: 

• Explore each direction:

  • North:  Karyana store lies directly north of my location.
  • Northeast: My school lies in the northeast direction.
  • East: Female’s gym lies directly east of my location.
  • Southeast: Playground lies in the southeast direction.
  • South: Community Hall lies directly south of my location.
  • Southwest: A barber shop lies in the southwest direction.
  • West: Children’s park lies directly west of your location.
  • Northwest: A shopping complex lies in the northwest direction.

5.  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.

Answer: 

Local Time:

          The calculation of local time takes place based on the motion of the sun.

Standard Time:

                 On the other hand, the setting of the standard time happens based upon the time set by that particular country for various locations.

                                                                  OR

Local Time	Standard Time
1. It refers to the time of a particular country or a place.	1. It refers to the official time of a region, consisting of several countries.
2. It depends on the movement of the sun.	2. It depends on the laws made in a country.
3. It changes due to the shift in longitudes.	3. it remains constant in the country.

6. 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?

Answer: 

The latitude difference between Delhi (29°N) and Bengaluru (13°N) is 16 degrees.

Delhi and Bengaluru both have a longitude of approximately 77°E. Since their longitudes are the same.

Difference in local time between the two cities: 

The time difference will be primarily influenced by their difference in latitude.

• The latitude difference between Delhi and Bengaluru is 16 degrees.
• Each degree of latitude corresponds to a time difference of 4 minutes.

Calculating the time difference:

16×4=64 minutes.

So, the difference in local time between Delhi and Bengaluru is 64 minutes. This means when it is 12:00 PM (noon) in Delhi, it will be 12:64 PM (1:04 PM) in Bengaluru.

7. Mark the following statements as true or false; explain your answers with a sentence or two.

   i) All parallels of latitude have the same length.
   ii)  The length of a meridian of longitude is half of that of the Equator.
   iii)  The South Pole has a latitude of 90°S.
   iv)   In Assam, the local time and the IST are identical. 
   v)  Lines separating the time zones are identical with meridians of longitude.
   vi)  The Equator is also a parallel of latitude.

Answer:

    i). False - while all the parallels or latitudes on Earth are parallel to the Equator, they are not of the same length. The length of a degree of latitude varies depending on the distance from the Equator.

   ii) False - The length of a meridian of longitude is the same as the length of the Equator, as both are great circles of the Earth and therefore have the same circumference.

   iii) True -  The South Pole is located at the southernmost point on the Earth, and its latitude is 90°S, indicating it is 90 degrees south of the Equator.

   iv) True -  Assam, located in northeastern India, follows Indian Standard Time (IST), which is UTC+5:30. Therefore, the local time in Assam is identical to IST.

   v) False - Lines separating time zones generally follow meridians of longitude but are often adjusted to follow political boundaries and other practical considerations, so they are not always identical with meridians of longitude.

   vi) True - The Equator is a parallel of latitude, specifically at 0° latitude, dividing the Earth into the Northern and Southern Hemispheres.

   vii)  Solve the crossword below.

Answer:

          Across                            Down 

        1. SCALE                   2. LONGITUDE

        4. GLOBE                  3. COORDINATES

        5. EQUATOR            6. GRID

        6. GREENWICH       7. IST

        8. MAP                     9. POLE

       10. LATITUDE          11. IDL(International Date Line) 

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