Question 4 of 10intermediate💡 UnderstandShort Answer3 marks

Return to the two friends sitting in Gujarat and Assam. Use this example to explain the difference between local time and standard time.

Correct Answer

Local time is the time based on the actual longitude of a place — it varies from place to place within a country.

In the example, Porbandar and Tinsukia have different local times (about 2 hours difference) because they are at different longitudes.

Standard time is the uniform time adopted by a country for convenience — all of India follows Indian Standard Time (IST), which is based on the longitude 82.5°E.

Despite having different local times, both friends follow the same standard time (IST) for practical purposes.

Exercise: LET'S EXPLORE | Q: 13 | (Page Page 21)
For More Understanding

Explanation

The chapter distinguishes between local time and standard time. Local time varies with longitude — every place has its own local time based on its longitude. However, using different local times within a country would be inconvenient. Therefore, countries adopt a standard time based on a central meridian. India's standard time is based on the meridian at 82.5°E (or 82°30'E), which is 5 hours 30 minutes ahead of Greenwich Mean Time (GMT). The example of Gujarat and Assam illustrates why standard time is necessary despite local time differences.

Solution Steps

  1. Local time is based on the actual longitude of a place and varies from place to place within a country

  2. Porbandar and Tinsukia have different local times (about 2 hours difference) due to their different longitudes

  3. Standard time is the uniform time adopted by a country for convenience

  4. India follows Indian Standard Time (IST) based on the longitude 82.5°E

  5. Both friends follow the same IST despite having different local times

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