Study the given map and answer the questions that follow : (19.1) Name the railway line given in the map. (19.

Question

Q. Study the given map and answer the questions that follow : (19.1) Name the railway line given in the map. (19.2) Name the places marked as '(A)' and '(B)' in the given map. (19.3) Explain the importance of the railway line given on the map. [Visually Impaired alternative in lieu of Q.19: Explain any three characteristics of the 'Australian Trans-Continental Railway'.]

CBSECBSE Class XII Board 2024Subjective· 3mImportance★★★★★

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Concept understanding — Hydel Power Generation

Hydel Power Generation: From Intuition to Precision

Think about a river flowing downhill. You can feel the force of the water — it can sweep you off your feet. That force comes from gravity pulling the water from a higher place to a lower place. Now imagine you could capture that force and use it to spin a wheel. That spinning wheel could turn a generator, and that generator could produce electricity. That, in a nutshell, is hydel (hydroelectric) power generation.

The core idea is simple: convert the gravitational potential energy of stored water into electrical energy.

The Intuition: Why Water Can Do Work

Water at a height has potential energy — energy stored because of its position. When you let it fall, that potential energy turns into kinetic energy (the energy of motion). A fast-moving stream of water can push against the blades of a turbine (like a fan but built to be pushed by water), making it spin. The spinning turbine is connected to a generator, which uses electromagnetic induction to produce electricity.

So the chain is:

Water stored at a height (potential energy)
Water released downhill (kinetic energy)
Water strikes turbine blades (mechanical energy of rotation)
Turbine spins generator (electrical energy)

Note

This is the same principle as a dam. The dam creates a height difference (called the head) and stores a large volume of water. The higher the head and the greater the flow rate, the more power you can generate.

The Precise Statement

Hydel power generation is the process of converting the gravitational potential energy of water into electrical energy by allowing water to flow from a higher elevation to a lower elevation through a turbine coupled to a generator.

The power available from a hydel plant is given by:

P = \eta \, \rho \, g \, h \, Q

Where:

$P$ = electrical power output (watts)
$\eta$ = overall efficiency of the turbine-generator system (typically 0.8–0.9)
$\rho$ = density of water ( $\approx 1000 \, \text{kg/m}^3$ )
$g$ = acceleration due to gravity ( $9.8 \, \text{m/s}^2$ )
$h$ = effective head (vertical height difference, in metres)
$Q$ = volumetric flow rate of water ( $\text{m}^3/\text{s}$ )

P = \eta \, \rho \, g \, h \, Q

This formula tells you everything: to get more power, you need either more height ( $h$ ), more water flow ( $Q$ ), or higher efficiency ( $\eta$ ). That's why mountain rivers with steep drops are ideal — a small flow at a great height can match a large flow at a small height.

Key Components of a Hydel Plant

Component	Function
Dam / Reservoir	Stores water and creates the head

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The map depicts a major railway line connecting two significant points in India, likely illustrating either a trans-continental route or a line linking important industrial or port cities, demonstrating the role of railways in national integration and economic development.

Without access to the specific map referenced in the question, I cannot identify the exact railway line or the precise locations marked as (A) and (B). However, the structure of the question—asking for a named railway line, two terminal or junction points, and its importance—suggests this is a major trunk route or a historically significant corridor in India's railway network.

India's railway system, one of the largest in the world, comprises several nationally important lines. These include the Golden Quadrilateral connecting the four metropolitan cities, the Konkan Railway along the western coast, the North-Eastern Frontier Railway linking the northeast, and various trans-continental routes that bind distant regions. Each of these lines serves strategic purposes: moving freight between industrial hubs and ports, connecting remote areas to mainstream economic activity, facilitating passenger movement across vast distances, and supporting defense logistics in border regions.

The importance of any major railway line in India typically rests on several pillars. Economically, it enables the movement of raw materials from resource-rich areas to manufacturing centers and finished goods to markets and export terminals. Socially, it knits together diverse linguistic and cultural regions, fostering national unity and enabling migration for education and employment. Strategically, railways provide the backbone for rapid deployment of defense forces and supplies to sensitive border areas. Developmentally, they open up previously isolated regions, spurring urbanization, trade, and investment along the corridor. …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2024Set 64/2/13 marks
$Q. Study the given map and answer the questions that follow : (19.1) Name the railway line given in the map. (19.2) Name the places marked as '(A)' and '(B)' in the given map. (19.3) Explain the importance of the railway line given on the map. [Visually Impaired alternative in lieu of Q.19: Explain any three characteristics of the 'Australian Trans-Continental Railway'.]$
›Reveal solutionSolution

The map depicts a major railway line connecting two significant points in India, likely illustrating either a trans-continental route or a line linking important industrial or port cities, demonstrating the role of railways in national integration and economic development.

Without access to the specific map referenced in the question, I cannot identify the exact railway line or the precise locations marked as (A) and (B). However, the structure of the question—asking for a named railway line, two terminal or junction points, and its importance—suggests this is a major trunk route or a historically significant corridor in India's railway network.

India's railway system, one of the largest in the world, comprises several nationally important lines. These include the Golden Quadrilateral connecting the four metropolitan cities, the Konkan Railway along the western coast, the North-Eastern Frontier Railway linking the northeast, and various trans-continental routes that bind distant regions. Each of these lines serves strategic purposes: moving freight between industrial hubs and ports, connecting remote areas to mainstream economic activity, facilitating passenger movement across vast distances, and supporting defense logistics in border regions.

The importance of any major railway line in India typically rests on several pillars. Economically, it enables the movement of raw materials from resource-rich areas to manufacturing centers and finished goods to markets and export terminals. Socially, it knits together diverse linguistic and cultural regions, fostering national unity and enabling migration for education and employment. Strategically, railways provide the backbone for rapid deployment of defense forces and supplies to sensitive border areas. Developmentally, they open up previously isolated regions, spurring urbanization, trade, and investment along the corridor. …
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