Key to NCERT SST-6 Chapter 1 - Locating Places on the Earth

1. Why is it 5.30 pm in India when it is 12 pm or noon in London?

It is 5:30 pm in India when it is 12 noon in London because:

• The Earth rotates from west to east, so places in the east see the Sun earlier.

• India lies east of London, so time in India is ahead.

• India follows Indian Standard Time (IST), which is 5 hours 30 minutes ahead of Greenwich Mean Time (GMT) used in London.

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

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

We need symbols and colours in maps because:

• They make maps easy to understand.

• Symbols show things like rivers, roads, schools, and mountains.

• Colours help to differentiate land, water, forests, and heights.

• They help us read a lot of information quickly without long descriptions.

Thus, symbols and colours make maps clear, simple, and useful.

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

Local Time and Standard Time are different in the following ways:

• Local Time is the time of a place based on the position of the Sun at that place.

• Standard Time is the same time followed by the whole country.

Local time changes from place to place, but standard time is fixed and helps in maintaining uniform time across the country.

Delhi's and Bengaluru's latitudes are 29oN and 12oN; their longitudes are almost the same, 77oE. How much will be the difference in local time between the two cities?

There will be no difference in local time between Delhi and Bengaluru because:

• Local time depends on longitude, not latitude.

• Both cities lie almost on the same longitude (77°E).

So, the difference in local time is zero.

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