The video explains the concept of standard time and its necessity due to differing local times across meridians. It highlights the time difference within India, using Dwaraka and Dibrugarh as examples, and introduces Indian Standard Time (IST) based on the 82.5°E meridian. The video also compares the time difference between India and England, noting India's 5.5-hour lead over GMT. It discusses countries with multiple time zones, like Russia, and concludes with an overview of Earth's 24 time zones, each covering 15° of longitude.

Why is it challenging to create a timetable for trains crossing several longitudes?

• Because trains travel at different speeds

• Due to the varying local times across different meridians

• Because of the different weather conditions

• Due to the different train models used

What is the time difference between Dwaraka in Gujarat and Dibrugarh in Assam?

• 2 hours and 15 minutes

• 1 hour and 45 minutes

• 1 hour and 30 minutes

• 2 hours

What is the longitude used as the standard meridian for India?

• 60°E

• 90°E

• 82°30'E

• 75°E

How many hours ahead of GMT is India located at 82°30'E?

• 4 hours and 30 minutes

• 5 hours

• 6 hours

• 5 hours and 30 minutes

How many standard times does Russia have due to its longitudinal extent?

• 11

• 7

• 9

• 5

How many time zones is the Earth divided into?

• 24

• 18

• 12

• 30