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MCQ on Standard Time of India

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Most Important MCQs on the topic ” Standard Time of India”(Ch-3). These questions are very important for SSC, Railways, Defence, CTET, State PCS, UPSC, Judiciary and all other examinations of India.

Q. What is the standard time of India?
(A) IST (Indian Standard Time)
(B) EST (Eastern Standard Time)
(C) GMT (Greenwich Mean Time)
(D) PST (Pacific Standard Time)

Ans:- (A) IST (Indian Standard Time)

Explanation: – The Indian Standard Time (IST) is the time zone used in India. India Standard Time (IST) is 5:30 hours ahead of Coordinated Universal Time (UTC).

Q. Which of the following longitudes is known as ‘Standard Meridian’ in India?
(A) 87º 30′ E
(B) 85º 30′ E
(C) 84º 30′ E
(D) 82º 30′ E

Ans:- (D) 82º 30′ E

Explanation:- IST is based on the longitude 82.5 degrees( 82º 30′) East, which passes through the city of Mirzapur in Uttar Pradesh. This longitude is 5 hours and 30 minutes ahead of the Greenwich Mean Time (GMT), which is based on the prime meridian passing through the Royal Observatory in Greenwich, London.

Q. Which organization is responsible for maintaining the standard time in India?
(A) Indian Space Research Organization
(B) Indian National Science Academy
(C) National Physical Laboratory
(D) Indian Institute of Technology

Ans:- (C) National Physical Laboratory

Explanation:- The National Physical Laboratory (NPL) is responsible for maintaining the standard time in India, including the measurement of time and frequency.

Q. In which year was IST officially adopted in India?
(A) 1905
(B) 1947
(C) 1950
(D) 1962

Ans:- (B) 1947

Explanation:-  Indian Standard Time (IST) was adopted as the official time zone for India on September 1, 1947, by the Indian Government. 

Q. Which of the following cities is closest to IST (Indian Standard Time) meridian?
(A) Rewa
(B) Sagar
(C) Ujjain
(D) Hoshangabad

Ans:- (A) Rewa

Q. If it is 10:00 a.m. IST, then what would be the local time at Shillong on 92º E longitude?
(A) 9:38 a.m.
(B) 10:38 a.m.
(C) 10:22 a.m.
(D) 9:22 a.m.

Ans:- (B) 10:38 a.m.

Explanation: –

The time difference between each degree of longitude is 4 minutes. So, to calculate the time difference between IST and Shillong, we need to find out how many degrees of longitude separate the two locations.
92º E longitude is 10.5 hours ahead of GMT (Greenwich Mean Time), which means it is 5.5 hours ahead of IST. To convert this to degrees of longitude, we multiply 5.5 by 15 (since each hour corresponds to 15 degrees of longitude), which gives us 82.5º E longitude.
Therefore, the time difference between IST and Shillong is 9.5 degrees of longitude (92º E – 82.5º E), which corresponds to a time difference of 38 minutes (9.5 x 4).
So, if it is 10:00 a.m. IST, the local time at Shillong would be 10:38 a.m., which is option (B).

Q. When there is midnight at IST meridian, a place observes 6 A.M. The meridian on which the said place is located is______.
(A) 7º 31′ E
(B) 172º 30′ E
(C) 7º 30′ E
(D) 127º 30′ W

Ans:- (B) 172º 30′ E

Explanation: –

Indian Standard Time (IST) is based on the longitude 82.5º E. Midnight at this meridian corresponds to 12:00 a.m. IST.
The question states that a place observes 6:00 a.m. when it is midnight at the IST meridian. This means that the local time at this place is 6 hours ahead of IST.
Since the Earth rotates 360 degrees in 24 hours, it rotates 15 degrees in one hour. Therefore, the place is located 6 hours x 15 degrees per hour = 90 degrees east or west of the IST meridian.
Since the place is 6 hours ahead of IST, it must be located to the east of IST. Therefore, the meridian on which the place is located is:
82.5 degrees East + 90 degrees East = 172.5 degrees East.
We can see that the correct option is (B) 172º 30′ E.

Q. How many hours of time difference will be there between the most Western village of Gujarat and the most Eastern village of Arunachal Pradesh, Walong?
(A) 1 hour
(B) 2 hours
(C) 3 hours
(D) 1/2 hour

Ans:- (B) 2 hours

Explanation:-

The most western village of Gujarat is Koteshwar, located at a longitude of 68.1° E, while the most eastern village of Arunachal Pradesh, Walong, is located at a longitude of 97.02° E.
To calculate the time difference between these two villages, we need to first calculate the difference in their longitudes.
The difference in longitude between Koteshwar and Walong is:
97.02° E – 68.1° E = 28.92°
Each degree of longitude corresponds to 4 minutes of time difference. Therefore, the time difference between Koteshwar and Walong would be:
28.92° x 4 minutes/degree = 115.68 minutes
We need to convert this time to hours, by dividing it by 60:
115.68 minutes / 60 minutes/hour ≈ 1.93 hours
Therefore, the time difference between the most western village of Gujarat and the most eastern village of Arunachal Pradesh, Walong, is approximately 2 hours.
Hence, the correct option is (B) 2 hours.

Q. If the Sun rises at Tirap in Arunachal Pradesh at 5:00 a.m. (IST), then what time (IST), will the Sun rise in Kandla in Gujarat?
(A) About 5:30 a.m.
(B) About 6:00 a.m.
(C) About 7:00 a.m.
(D) About 7:30 a.m.

Ans:- (C) About 7:00 a.m.

Explanation: –

The longitudinal difference between Tirap in Arunachal Pradesh and Kandla in Gujarat is approximately 30 degrees (97.02° E – 68.24° E ≈ 28.78°, which we can round off to 30° for simplicity).
We know that for every 15 degrees of longitude, there is a time difference of one hour. Therefore, the time difference between Tirap and Kandla is:
30° / 15° per hour = 2 hours
Since the sun rises at 5:00 a.m. (IST) in Tirap, the sun would rise in Kandla at 7:00 a.m. (IST) (5:00 a.m. + 2 hours).
Therefore, the correct option is (C) About 7:00 a.m

Q. When it is noon at IST meridian, what would be the local time at 120º East longitude?
(A) 09:30
(B) 14:30
(C) 17:30
(D) 20:00

Ans:- (B) 14:30

Explanation: –

The Indian Standard Time (IST) is based on the longitude 82.5° E. When it is noon at the IST meridian, it corresponds to 12:00 p.m. (IST).
To find the local time at 120° East longitude, we need to calculate the time difference between the IST meridian and 120° East longitude.
The difference in longitude between the IST meridian and 120° East longitude is:
120° E – 82.5° E = 37.5°
Each degree of longitude corresponds to 4 minutes of time difference. Therefore, the time difference between the IST meridian and 120° East longitude is:
37.5° x 4 minutes/degree = 150 minutes
We need to add this time difference to the time at the IST meridian (12:00 p.m.) to find the local time at 120° East longitude:
12:00 p.m. + 150 minutes = 2:30 p.m.
Therefore, the local time at 120° East longitude would be 2:30 p.m.
Hence, the correct option is (B) 14:30.

Q. The Indian Standard Time Meridian does not pass through______.
(A) Andhra Pradesh
(B) Chhattisgarh
(C) Maharashtra
(D) Uttar Pradesh

Ans:- (C) Maharashtra

Explanation: – In India, the standard meridian passes through the states of Uttar Pradesh, Orissa, Andhra Pradesh, Madhya Pradesh, and Chattisgarh. So, The Indian Standard Time Meridian does not pass through Maharashtra.

Q. Standard Indian Time (Meridian Longitude 82º 30′) passes through which of the following towns?
(A) Nagpur
(B) Delhi
(C) Patna
(D) Allahabad

Ans:- (D) Allahabad

Q. The Indian Standard Time is taken from which of the following city?
(A) Allahabad (Naini)
(B) Lucknow
(C) Meerut
(D) Muzaffarnagar

Ans:- (A) Allahabad (Naini)

Q. How much is the difference between Indian Standard Time (I.S.T.) and Greenwich Mean Time (G.M.T.)?
(A) +4½ hours
(B) +5½ hours
(C) – 5½ hours
(D) – 4½ hours

Ans:- (B) +5½ hours

Q. Which country is India’s standard time (IST) based on?
(A) China
(B) United States
(C) United Kingdom
(D) France

Q. Consider the following statements.

  1. Longitude of Jabalpur’s location is between those of Indore and Bhopal.
  2. Latitude of Aurangabad’s location is between those of Vadodara and Pune.
  3. Bangalore is situated more Southward than Chennai.

Which of these statements is/are correct?
(A) 1 and 3
(B) Only 2
(C) 2 and 3
(D) 1, 2 and 3

Ans:- (C) 2 and 3

The Indian Standard Time Meridian


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