Q170. Consider the following statements:
I. The Prime Meridian is the same as the International Date Line.
II. West of the International Date Line is always a day later than east of the line.
III. The Earth turns 15° of longitude in an hour.
Which statements are correct?
[UPSC NDA General Ability (13 September 2026)]
(A) I and II only
(B) I and III only
(C) II and III only
(D) III only
Answer: (C) II and III only
Explanation: The Prime Meridian is at 0° while the International Date Line is approximately 180°. The western side of the Date Line is one calendar day ahead of the eastern side. Earth rotates 360° in 24 hours, or 15° per hour.
Q169. Which of the following rivers helps define a portion of the India–Bangladesh border?
[RRB NTPC UG CBT-I (20 June 2026, Shift 3)]
(A) Ganga
(B) Brahmaputra
(C) Narmada
(D) Mahanadi
Answer: (A) Ganga
Explanation: The Ganga, known as the Padma after entering Bangladesh, is associated with the international boundary in the eastern region. The Narmada and Mahanadi do not flow across the India–Bangladesh frontier, making them unsuitable answers to this geographical question.
Q168. Which of the following districts of Bihar does not share an international boundary with Nepal?
[Bihar Police Prohibition Constable (17 June 2026, Shift 2; memory-based)]
(A) West Champaran
(B) Madhubani
(C) Darbhanga
(D) Sitamarhi
Answer: (C) Darbhanga
Explanation: Darbhanga lies inland in northern Bihar and does not reach the India–Nepal boundary. West Champaran, Madhubani and Sitamarhi are among Bihar’s northern frontier districts. Identifying the answer requires distinguishing adjacent inland districts from districts directly touching Nepal.
Q167. What is the exact length of the international boundary that Bihar shares with Nepal to the north?
[Bihar Police Prohibition Constable (17 June 2026, Shift 2; memory-based)]
(A) 729 km
(B) 483 km
(C) 345 km
(D) 995 km
Answer: (A) 729 km
Explanation: Bihar shares an approximately 729-kilometre international border with Nepal along its northern edge. The boundary extends across several districts and remains an important route for cross-border trade, travel and cultural exchange between communities on both sides.
Q166. Which of the following Indian states is NOT crossed by the Tropic of Cancer?
[RRB NTPC UG CBT-I (13 June 2026, Shift 2)]
(A) Madhya Pradesh
(B) Gujarat
(C) Odisha
(D) West Bengal
Answer: (C) Odisha
Explanation: The Tropic of Cancer crosses eight Indian states, including Gujarat, Madhya Pradesh and West Bengal. Odisha lies south of the latitude and is not among the eight. The line is situated at approximately 23°30′ north of the Equator.
Q165. The country which has the longest border with India is _____.
[Indian Army Agniveer GD (9 June 2026, Shift 2; memory-based)]
(A) China
(B) Nepal
(C) Pakistan
(D) Bangladesh
Answer: (D) Bangladesh
Explanation: India’s longest land boundary is with Bangladesh, extending about 4,096.7 kilometres. By comparison, the officially quoted India–China boundary is around 3,488 kilometres. Bangladesh borders West Bengal, Assam, Meghalaya, Tripura and Mizoram, creating India’s longest shared international land frontier.
Q164. Which of the following neighbouring countries shares the longest land border with India?
[DSSSB Court Attendant (3 June 2026, Shift 1)]
(A) China
(B) Nepal
(C) Pakistan
(D) Bangladesh
Answer: (D) Bangladesh
Explanation: Bangladesh shares the longest land border with India, approximately 4,096.7 kilometres. The extensive frontier follows five Indian states. The boundaries with Pakistan, China and Nepal are shorter, making Bangladesh the correct response to this comparative question.
Q163. Tropic of Cancer passes through which of the following neighbouring country of India?
[SSC GD Constable (22 May 2026, Shift 3)]
(A) Bangladesh
(B) Pakistan
(C) Bhutan
(D) Nepal
Answer: (A) Bangladesh
Explanation: The Tropic of Cancer lies close to 23°30′ north latitude and passes through Bangladesh as well as India and Myanmar in this region. It does not cross Pakistan, Bhutan or Nepal, which lie outside the stated path in the options.
Q162. The mainland of India extends between the latitudes of ______.
[DSSSB MTS (1 May 2026, Shift 3)]
(A) 2°4′ N and 7°6′ N
(B) 8°4′ N and 37°6′ N
(C) 18°14′ N and 77°6′ N
(D) 81°4′ N and 37°64′ N
Answer: (B) 8°4′ N and 37°6′ N
Explanation: Mainland India stretches from approximately 8°4′ north at Kanyakumari to 37°6′ north in the Kashmir region. The island territories extend still farther south, so the question’s distinction between mainland India and the entire Union is essential.
Q161. The “Great Nicobar Island” is closest to which neighbouring country?
[SSC GD Constable (30 April 2026, Shift 2)]
(A) Myanmar
(B) Sri Lanka
(C) Indonesia
(D) Bangladesh
Answer: (C) Indonesia
Explanation: Great Nicobar lies at the southern end of the Andaman and Nicobar archipelago, close to the Indonesian island of Sumatra. Indonesia is therefore the nearest country among the options. The island also contains Indira Point, India’s southernmost geographical point.