SST (VI)-LESSON-1 LOCATING PLACES ON THE EARTH (QUESTION ANSWERS)

 

SST (VI)-LESSON-1

LOCATING PLACES ON THE EARTH

(QUESTION ANSWERS)

 

NCERT QUESTIONS WITH ANSWERS

 

Q1. 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.

Answer:

1.    Scale given on the map:
2.5 cm = 500 km

2.    Approximate distance measured on the map:
About 8 cm (rounded figure)

3.    Therefore,

$$\frac{500}{2.5} \times 8 = 1600 \$$

4.    Hence, the real distance between the estuary of the Narmada River and the estuary of the Ganga River is approximately 1600 km.

Q2. Why is it 5:30 pm in India when it is 12 pm or noon in London?

Answer:

1.    India follows Indian Standard Time (IST).

2.    IST is based on 82.5°E longitude.

3.    London lies near the Prime Meridian (0° longitude).

4.    The Earth rotates from west to east and covers 15° in one hour.

5.    India is 82.5° east of London.

        82.5° \15° = 5.5  hours}

6.    Therefore, India is 5 hours 30 minutes ahead of London.

7.    So, when it is 12 noon in London, it is 5:30 pm in India.

Q3. Why do we need symbols and colours in the map?

Answer:

1.    Symbols and colours make maps easy to read and understand.

2.    They help represent many features in limited space.

3.    Different symbols show roads, rivers, railway stations, forests, schools, etc.

4.    Colours help identify natural and political features quickly.

5.    Blue is generally used for water bodies, green for plains and forests, and brown for mountains.

6.    They make maps neat, accurate and useful for everyone.

Q4. Find out what you have in the eight directions from your home or school.

Answer:

(Example Answer – Students may modify according to their locality)

Direction	Place/Feature
North	Market
South	Park
East	School
West	Hospital
Northeast	Temple
Northwest	Bus Stand
Southeast	Playground
Southwest	Residential Area

Q5. What is the difference between local time and standard time?

Answer:

Local time is the time calculated according to the position of the Sun at a particular place. Different places have different local times because they lie on different longitudes. For example, sunrise occurs earlier in eastern India than in western India.

Standard time is the uniform time followed by the whole country. It is based on one selected meridian called the standard meridian. India follows Indian Standard Time (IST), which is based on 82.5°E longitude.

Local time differs from place to place, whereas standard time remains the same throughout the country. Standard time helps maintain uniformity in transport, communication and administration.

 

Q6. 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:

1.    Local time depends on longitude, not latitude.

2.    Delhi and Bengaluru both lie near 77°E longitude.

3.    Therefore, their local time will be almost the same.

Hence, the difference in local time between Delhi and Bengaluru is zero or negligible.

Q7. Mark the following statements as True or False. Give reasons.

(i) All parallels of latitude have the same length.

Answer:

False

• The Equator is the longest parallel.
• The length of parallels decreases towards the poles.

(ii) The length of a meridian of longitude is half of that of the Equator.

Answer:

True

• A meridian is a half-circle running from the North Pole to the South Pole.
• The Equator is a complete circle.

(iii) The South Pole has a latitude of 90°S.

Answer:

True

• The South Pole lies at the southernmost point of the Earth.
• Its latitude is 90° South.

(iv) In Assam, the local time and the IST are identical.

Answer:

False

• Assam lies in eastern India where the Sun rises earlier.
• Therefore, local time in Assam is ahead of IST.

 

(v) Lines separating the time zones are identical with meridians of longitude.

Answer:

False

• Time zone boundaries are not completely straight.
• They are adjusted according to country borders and convenience.

(vi) The Equator is also a parallel of latitude.

Answer:

True

• The Equator is an imaginary line running east-west.
• It is the 0° latitude and the largest parallel.