Railway RRB / NTPC - MCQ Practice Questions

Methane (CH₄) is the main component of natural gas, comprising about 70-90% of its composition. It is the simplest hydrocarbon and is widely used as a fuel.

The kidneys are bean-shaped organs that filter waste products and excess water from the blood to produce urine. A human typically has two kidneys.

Newton's third law states that for every action, there is an equal and opposite reaction. This means forces always act in pairs - if object A exerts a force on object B, then B exerts an equal force on A in the opposite direction.

Insulin, produced by the pancreas, regulates blood glucose levels by promoting glucose uptake by cells.

Gravitational potential energy = mgh = 5 × 10 × 2 = 100 J

The pH scale ranges from 0 to 14, where 7 is neutral, below 7 is acidic, and above 7 is basic/alkaline.

Melting of ice is an endothermic process as it requires heat energy input to convert solid ice into liquid water. Other options are exothermic reactions that release heat.

The relationship between focal length (f) and radius of curvature (R) is: R = 2f. Therefore, R = 2 × 20 = 40 cm.

To find the cost price when selling price and profit percentage are known, use the relationship: $\text{Selling Price}=\text{Cost Price}\times (1+\text{Profit\%}/100)$

Step 1: Set up the profit formula

When a shopkeeper makes a 25% profit, the selling price is 125% of the cost price.

Step 2: Express in terms of cost price

Step 3: Solve for cost price

Step 4: Calculate the final answer

Verification: If CP = Rs. 480, then profit = $600-480=120$, and profit% = $\frac{120}{480}\times 100=25\%$ ✓

Answer: The cost price was Rs. 480 (Option B)

3x + 5x = 80; 8x = 80; x = 10. Numbers are 30 and 50

SI = (P × R × T)/100 = (5000 × 8 × 3)/100 = 1200

Time = 6.5 hours; Speed = $\frac{195}{6}$.5 = 30 km/h

35% of 2000 = 700; 20% of 700 = 140

x × 1.15 = 345; x = $\frac{345}{1}$.15 = 300

Sum = 22 × 5 = 110; 18 + 24 + 20 + 26 = 88; Fifth = 110 - 88 = 22

If milk is 5 parts and equals 40L, then 1 part = 8L; water (3 parts) = 24L

As of 2024, India has 18 railway zones after the creation of new zones in recent years.

This is a straightforward geographical/factual question about India's railways. The answer requires knowledge of major railway routes and their lengths.

Step 1: Understand what the question asks

The question seeks the longest railway line in India. We need to distinguish between a train route and railway administrative zones.

Step 2: Analyze the options

Step 3: Identify the actual longest route

The Dibrugarh–Kanyakumari route is the longest continuous railway route in India, connecting the northeastern region to the southern tip of the country. This train service covers the maximum distance among all Indian railway routes.

Step 4: Eliminate confusion

Options B, C, and D refer to railway zones (administrative regions), not actual railway lines or routes. The question specifically asks for the longest "railway line," which refers to a specific route.

Answer: The Dibrugarh–Kanyakumari Vivek Express route is the longest railway line in India at approximately 4,233 km. (Option A)

Vande Bharat Express trains have a maximum operational speed of 160 km/h.

# Solution: One Nation One Ticket Portal Launch

This is a factual/current affairs question about Indian Railways' digital initiative. No calculations required—direct factual recall.

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## Context

Indian Railways has been modernizing its ticketing and travel systems to provide seamless, integrated passenger experiences across multiple modes of transport. The 'One Nation One Ticket' portal is part of this digital transformation initiative.

## Key Information

One Nation One Ticket is an integrated ticketing platform launched by Indian Railways to allow passengers to book tickets across multiple transport modes (rail, metro, bus, air) through a single portal, simplifying inter-modal travel throughout India.

The portal was officially introduced in August 2024, representing a significant step toward unified mobility solutions in the country.

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## Why Other Options Are Incorrect

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Answer: August 2024 (Option C)

This recent initiative reflects Indian Railways' commitment to customer-centric digital innovation and seamless multi-modal transportation integration.