With reference to the Indian Standard Time (IST), consider the following statements: 1. It is based on the meridian 90° E. 2. This meridian passes through Mirzapur in Uttar Pradesh. 3. The time difference between IST and GMT is 5 hours and 30 minutes. Which of the statements given above is/are correct?

The correct option is 2 and 3 only . Explanation Indian Standard Time (IST) is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. It is calculated on the basis of a specific longitude chosen to pass roughly through the center of the country to ensure a uniform time zone. - Statement 1 is Incorrect: The Indian Standard Time is calculated on the basis of 82°30' E longitude (82.5° E), not 90° E. The 90° E meridian passes further east, through states like Assam and Meghalaya. - Statement 2 is Correct: The Standard Meridian of India (82°30' E) passes through Mirzapur (near Prayagraj/Allahabad) in Uttar Pradesh. This meridian is taken as the standard time for the whole country. It passes through five states: Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Odisha, and Andhra Pradesh. - Statement 3 is Correct: The Earth rotates 360° in about 24 hours, which means 15° per hour or 1° every 4 minutes. Since the Standard Meridian of India is 82°30' E, the time difference is calculated as: 82.5 × 4 minutes = 330 minutes 330 minutes = 5 hours and 30 minutes. Since India is located east of the Prime Meridian (Greenwich), IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). Key Takeaway: Indian Standard Time is based on the 82°30' E meridian, which passes through Mirzapur, and is 5 hours 30 minutes ahead of GMT.

NCERT Class 11 Geography — Chapter 1: India - Location

mcqmedium

With reference to the Indian Standard Time (IST), consider the following statements:

It is based on the meridian 90° E.
This meridian passes through Mirzapur in Uttar Pradesh.
The time difference between IST and GMT is 5 hours and 30 minutes.

Which of the statements given above is/are correct?

Official previous-year question

Verified 1 Aug 2026.

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is

2 and 3 only

Explanation

Indian Standard Time (IST) is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. It is calculated on the basis of a specific longitude chosen to pass roughly through the center of the country to ensure a uniform time zone.

Statement 1 is Incorrect: The Indian Standard Time is calculated on the basis of 82°30' E longitude (82.5° E), not 90° E. The 90° E meridian passes further east, through states like Assam and Meghalaya.
Statement 2 is Correct: The Standard Meridian of India (82°30' E) passes through Mirzapur (near Prayagraj/Allahabad) in Uttar Pradesh. This meridian is taken as the standard time for the whole country. It passes through five states: Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Odisha, and Andhra Pradesh.
Statement 3 is Correct: The Earth rotates 360° in about 24 hours, which means 15° per hour or 1° every 4 minutes. Since the Standard Meridian of India is 82°30' E, the time difference is calculated as:
82.5 × 4 minutes = 330 minutes
330 minutes = 5 hours and 30 minutes.
Since India is located east of the Prime Meridian (Greenwich), IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).

Key Takeaway: Indian Standard Time is based on the 82°30' E meridian, which passes through Mirzapur, and is 5 hours 30 minutes ahead of GMT.

Your note

More from Chapter 1: India - Location

Consider the following statements regarding the Indian Ocean: 1. India is located in the south-central part of Asia, bordering the Indian Ocean. 2. The Bay of Bengal is the only arm of the Indian Ocean. 3. Sri Lanka is located in the Indian Ocean. Which of the statements given above is/are correct?

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With reference to the latitudinal and longitudinal extent of India, consider the following statements: 1. The actual distance measured from the north to south extremity is shorter than that from east to west. 2. The distance between two longitudes decreases towards the poles, whereas the distance between two latitudes remains the same everywhere. 3. The latitudinal and longitudinal extent of India are roughly about 45 degrees each. Which of the statements given above is/are correct?

medium

Consider the following statements regarding the Indian Standard Time (IST): 1. The Standard Meridian of India is 82°30' E. 2. The standard meridian is selected in multiples of 15° of longitude to facilitate a general understanding among countries. 3. Indian Standard Time is ahead of Greenwich Mean Time by 5 hours and 30 minutes. Which of the statements given above is/are correct?

easy

With reference to India's territorial limits and measurements, consider the following statements: 1. India’s territorial limit extends towards the sea up to 12 statute miles from the coast. 2. One nautical mile is longer than one statute mile. 3. The southern boundary of India extends up to 6°45' N latitude in the Bay of Bengal. Which of the statements given above is/are correct?

medium

Consider the following statements regarding the size and geography of India: 1. The mainland coastline of India is 7,517 km long. 2. India accounts for 2.4 % of the world’s land surface area. 3. India is the fifth largest country in the world. Which of the statements given above is/are correct?

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The correct option is

2 and 3 only

Explanation

Statement 1 is Incorrect: The Indian Standard Time is calculated on the basis of 82°30' E longitude (82.5° E), not 90° E. The 90° E meridian passes further east, through states like Assam and Meghalaya.
Statement 2 is Correct: The Standard Meridian of India (82°30' E) passes through Mirzapur (near Prayagraj/Allahabad) in Uttar Pradesh. This meridian is taken as the standard time for the whole country. It passes through five states: Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Odisha, and Andhra Pradesh.
Statement 3 is Correct: The Earth rotates 360° in about 24 hours, which means 15° per hour or 1° every 4 minutes. Since the Standard Meridian of India is 82°30' E, the time difference is calculated as:
82.5 × 4 minutes = 330 minutes
330 minutes = 5 hours and 30 minutes.
Since India is located east of the Prime Meridian (Greenwich), IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).

Key Takeaway: Indian Standard Time is based on the 82°30' E meridian, which passes through Mirzapur, and is 5 hours 30 minutes ahead of GMT.