Identify from the following states of India through which the Tropic of Cancer passes and arrange them from east to west: 1. Gujarat 2. West Bengal 3. Uttar Pradesh 4. Jharkhand 5. Madhya Pradesh 6. Bihar 7. Chhattisgarh Select the correct answer using the code given below :

1. India's Latitudinal and Longitudinal Extent (basic)

To understand India's position on the globe, we first look at its mathematical location through coordinates. India is situated entirely in the Northern Hemisphere (latitudinally) and the Eastern Hemisphere (longitudinally). The Indian mainland extends from 8°4'N in the south (Kanniyakumari) to 37°6'N in the north (Kashmir). However, if we consider our island territories, India's southernmost point is actually 6°45'N in the Bay of Bengal India Physical Environment, Class XI, Chapter 1, p.2. Longitudinally, the mainland stretches from 68°7'E in Gujarat to 97°25'E in Arunachal Pradesh Contemporary India-I, Class IX, Chapter 1, p.2.

An interesting geographical puzzle arises when we look at the actual distances. Both the latitudinal and longitudinal spans are roughly 30 degrees. Yet, the actual ground distance from North to South is 3,214 km, while the East-West distance is only 2,933 km. Why the gap? This happens because latitudes are parallel and the distance between them remains constant everywhere. In contrast, longitudes (meridians) converge at the poles, meaning the distance between two longitudes decreases as you move away from the Equator toward the North Pole India Physical Environment, Class XI, Chapter 1, p.2.

Feature	Latitudinal Extent (N-S)	Longitudinal Extent (E-W)
Coordinates	8°4'N to 37°6'N	68°7'E to 97°25'E
Distance	3,214 km	2,933 km
Major Impact	Duration of day/night and climate	Time lag (Standard Time)

These coordinates have profound implications for our daily lives. The vast longitudinal extent causes a two-hour time lag between the easternmost point in Arunachal Pradesh and the westernmost point in Gujarat. To maintain uniformity, the 82°30'E longitude is chosen as the Standard Meridian of India, passing through Mirzapur in Uttar Pradesh Contemporary India-I, Class IX, Chapter 1, p.2. Similarly, the latitudinal extent influences the duration of day and night as you move from the tropical south toward the temperate north.

Sources: India Physical Environment, Class XI, India — Location, p.2; Contemporary India-I, Class IX, India Size and Location, p.2

2. The Standard Meridian of India (82°30' E) (basic)

Imagine the sun rising in the tea gardens of Arunachal Pradesh while the desert of Jaisalmer is still shrouded in darkness. Because India has a massive longitudinal stretch of nearly 30° (from roughly 68° E to 97° E), there is a significant time lag of about two hours between the easternmost and westernmost points of our country Contemporary India-I, India Size and Location, p.2. If every city followed its own local time based on the sun's position, our railway schedules and flight timings would be a chaotic mess! To avoid this, we use a single Standard Meridian to define Indian Standard Time (IST). India's Standard Meridian is fixed at 82°30' E longitude. You might wonder why this specific number was chosen. Globally, there is a convention to select standard meridians in multiples of 7°30'. This ensures that the time difference between different countries' standard times is usually a multiple of half an hour India Physical Environment, India — Location, p.2. Since 82°30' E is exactly 5.5 times 15° (the distance the earth rotates in one hour), it puts IST exactly 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). Geographically, this line passes right through the heart of India. It is often cited as passing through Mirzapur in Uttar Pradesh or close to the east of Prayagraj Physical Geography by PMF IAS, Latitudes and Longitudes, p.245. On its journey from North to South, the 82°30' E meridian traverses through five Indian states:

• Uttar Pradesh
• Madhya Pradesh
• Chhattisgarh
• Odisha
• Andhra Pradesh

Sources: Contemporary India-I, India Size and Location, p.2; India Physical Environment, India — Location, p.2; Physical Geography by PMF IAS, Latitudes and Longitudes, p.245

3. India's Land Frontiers and International Neighbors (intermediate)

India occupies a unique and central position in South Asia, possessing a massive land frontier of approximately 15,200 km Majid Husain, Geography of India, p.28. This land boundary is shared with seven countries, reflecting a diverse range of geographical and political landscapes. To the northwest, India borders Pakistan and Afghanistan. To the north, the boundary is defined by the high Himalayas, shared with China (Tibet), Nepal, and Bhutan. Finally, to the east, India shares borders with Myanmar and Bangladesh NCERT Class IX, Contemporary India-I, p.4. Among these neighbors, the border with Bangladesh is the longest, stretching about 4,096.7 km. This boundary was originally determined by the Radcliffe Award of 1947 and was further refined through the 100th Constitutional Amendment Act to resolve enclave disputes D. D. Basu, Introduction to the Constitution of India, p.76. In contrast, the border with China (approx. 3,917 km) is characterized by rugged, folded mountains and has historically been difficult to demarcate on the ground, leading to its definition primarily on maps Majid Husain, Geography of India, p.29.

Due to its central location, India is the only country in the region that shares a land border with all other South Asian neighbors, making it the heart of the subcontinent's geopolitical dynamics NCERT Class XII, Contemporary World Politics, p.41. This centrality often places India at the center of regional discussions regarding migration, river water sharing, and security.

Direction	Neighboring Countries
Northwest	Pakistan, Afghanistan
North	China (Tibet), Nepal, Bhutan
East	Bangladesh, Myanmar

Sources: Geography of India, Majid Husain, India–Political Aspects, p.28-29; Introduction to the Constitution of India, D. D. Basu, Territory of the Union, p.76; Contemporary India-I, NCERT Class IX, India Size and Location, p.4; Contemporary World Politics, NCERT Class XII, Contemporary South Asia, p.41

4. Coastal States and Maritime Boundaries (intermediate)

India possesses a magnificent coastline stretching over 7,516.6 km, encompassing the mainland and its island territories. On the mainland, nine states and two Union Territories share the sea. The Western Coast is flanked by the Arabian Sea and includes Gujarat, Maharashtra, Goa, Karnataka, and Kerala. Conversely, the Eastern Coast borders the Bay of Bengal, featuring West Bengal, Odisha, Andhra Pradesh, and Tamil Nadu. While the Western Ghats are continuous and higher, acting as a barrier for rain-bearing winds, the Eastern Ghats are discontinuous and irregular, having been dissected by major rivers draining into the Bay CONTEMPORARY INDIA-I, Physical Features of India, p.12.

Geographically, these two coasts differ significantly in their formation. The Eastern Coastal Plain is generally wider and characterized by large deltas formed by rivers like the Mahanadi, Godavari, Krishna, and Kaveri. These are often referred to as emergent coasts. In contrast, the Western Coastal Plain is narrower and is a submerged coast (except for parts of Gujarat and Kerala), which provides natural conditions for the development of deep-water ports like Mumbai and Marmagao Geography of India, Physiography, p.65. Popular tourist destinations are scattered across these coasts, from the beaches of Digha in West Bengal to the famous Kovalam in Kerala and the Marine Beach in Chennai Geography of India, Industries, p.93.

Feature	Western Coast	Eastern Coast
Nature	Narrow, Submerged (mostly)	Wide, Emergent
Major States	Gujarat, Maharashtra, Goa, Karnataka, Kerala	West Bengal, Odisha, Andhra Pradesh, Tamil Nadu
Key Features	Estuaries, Lagoons (Kayals)	Large Deltas, Fertile Alluvium

Beyond the physical land, India's Maritime Boundaries are defined by international law (UNCLOS). The Territorial Sea extends up to 12 nautical miles (nm) from the baseline, where India exercises full sovereignty. The Contiguous Zone extends to 24 nm, allowing for customs and immigration enforcement. Finally, the Exclusive Economic Zone (EEZ) extends up to 200 nm, giving India exclusive rights to explore and exploit marine resources, such as fisheries and minerals, which are crucial for the blue economy.

Sources: CONTEMPORARY INDIA-I, Physical Features of India, p.12; Geography of India, Physiography, p.65; Geography of India, Industries, p.93

5. The Tropic of Cancer (23°30' N) Path in India (intermediate)

The Tropic of Cancer (23°30' N) is a critical latitudinal line that bisects India almost into two equal halves. It enters the Indian mainland from the west at the Rann of Kuchchh in Gujarat and exits through Mizoram in the east CONTEMPORARY INDIA-I, Chapter 4, p. 27. In total, the line passes through eight Indian states. Moving from West to East, these states are:

1. Gujarat
2. Rajasthan (passes through the southern tip)
3. Madhya Pradesh
4. Chhattisgarh
5. Jharkhand
6. West Bengal
7. Tripura
8. Mizoram

Geographically, this line acts as a climatic divide. The area lying south of the Tropic of Cancer falls within the Tropical Zone, which is closer to the equator and experiences high temperatures throughout the year with a very small daily and annual range of temperature. Conversely, the region north of this line is considered Sub-tropical (or Temperate), experiencing more extreme climates with a high range of temperature between summer and winter INDIA PHYSICAL ENVIRONMENT, Chapter 4, p. 29.

It is important to note that while Bihar was historically associated with this line, after the creation of Jharkhand in 2000, the Tropic of Cancer now passes entirely through Jharkhand and no longer touches Bihar. Similarly, states like Odisha and Manipur are often confused as being on the path, but they lie entirely south and north of the line, respectively.

Region Relative to Tropic	Climatic Zone	Temperature Characteristics
South of 23°30' N	Tropical	High temperatures year-round; low annual range.
North of 23°30' N	Sub-tropical	Extreme climate; high daily and annual range.

Sources: CONTEMPORARY INDIA-I, Climate, p.27; INDIA PHYSICAL ENVIRONMENT, Climate, p.29; CONTEMPORARY INDIA-I, India Size and Location, p.6

6. Relative Mapping and Cardinal Directions (exam-level)

The Tropic of Cancer (23.5° N latitude) is the most significant latitudinal marker for the Indian subcontinent. It acts as a primary geographical and climatic divider, effectively splitting the country into two halves: the tropical zone to the south and the sub-tropical zone to the north INDIA PHYSICAL ENVIRONMENT, Chapter 4, p.29. Understanding the precise path of this line is essential for mastering relative mapping—the ability to visualize where states and cities lie in relation to major coordinates. In India, the Tropic of Cancer passes through eight states. To excel in geography questions, you must be able to visualize these states in a linear sequence from both West-to-East and East-to-West. The line begins its journey at the Rann of Kuchchh in the west and concludes at Mizoram in the east CONTEMPORARY INDIA-I, Chapter 4, p.27. A critical nuance in relative mapping is knowing which states border the line but are not intersected by it. For instance, Uttar Pradesh and Bihar are often confused as being on the line because of their central location, but they actually lie entirely to the north of the Tropic of Cancer. This distinction became particularly sharp after the year 2000; previously, the line passed through Bihar, but the creation of Jharkhand moved the intersected territory into the new state's boundaries.

Sources: INDIA PHYSICAL ENVIRONMENT (NCERT 2025 ed.), Chapter 4: Climate, p.29; CONTEMPORARY INDIA-I (NCERT 2025 ed.), Chapter 4: Climate, p.27

7. Solving the Original PYQ (exam-level)

This question is a classic application of the locational geography and latitudinal extent concepts you have just mastered. While knowing that the Tropic of Cancer passes through eight states is the basic building block, UPSC tests your spatial visualization by requiring a directional arrangement. As highlighted in CONTEMPORARY INDIA-I, Geography, Class IX. NCERT, the line essentially bisects the country, but the key is to mentalize the map from right to left (East to West). You must first apply the 'filter' of which states are actually intersected and then apply the 'sequencing' logic to the remaining candidates.

To arrive at the correct answer, start by eliminating the outliers: Uttar Pradesh (3) and Bihar (6). Both lie entirely north of the 23.5° N latitude. Bihar is a particularly common distractor because the Tropic of Cancer did pass through it prior to the administrative reorganization in 2000; however, that territory now belongs to Jharkhand. Once you focus on the remaining states, begin your journey from the Hooghly River in West Bengal (2), moving West into the Chota Nagpur Plateau of Jharkhand (4), then through Chhattisgarh (7), across the heart of Madhya Pradesh (5), and finally ending in Gujarat (1). This logical progression confirms that Option (B) 2-4-7-5-1 is the only sequence that respects the physical geography of the Indian subcontinent as detailed in INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.).

The primary trap in this question is the directional reversal; many candidates accidentally arrange states from West to East (1-5-7-4-2), which is the more common way we memorize lists. Furthermore, Options (C) and (D) are designed to catch students who have a vague sense of the region but forget the post-2000 political map changes. Notice how Option (A) attempts to swap Madhya Pradesh and Jharkhand, testing if you truly understand the longitudinal progression of central India. Always double-check if the question asks for 'East to West' or 'West to East' before finalizing your selection, as UPSC frequently uses this simple switch to induce silly mistakes.