RRB NTPC GK Questions 2026

The speed of light in a medium is inversely proportional to its refractive index, so the ratio of speeds is the inverse ratio of the refractive indices.

At about 1,684 km, the Kolkata–Chennai arm along the east coast is the longest of the four sides of the Golden Quadrilateral.

The Mekong river ends in a vast delta in southern Vietnam, where it splits into many channels before entering the South China Sea.

Dolomite is a sedimentary rock, not an igneous one; it forms from layers of carbonate deposits laid down in water.

Among the four states given, Tamil Nadu has by far the longest coastline, stretching from Pulicat Lake in the north to Kanyakumari in the south.

He led the no-tax campaign of the peasants of Bardoli taluka in Gujarat against an unjust rise in land revenue.

India stretches across about 30 degrees of longitude, and every degree makes a difference of four minutes in local time.

Sulphur dioxide dissolves in rainwater to form sulphuric acid, a main cause of acid rain. Burning coal and oil in power stations, smelters and vehicles releases sulphur dioxide and oxides of nitrogen into the air.

The so-called lead of a pencil is a mix of graphite and clay; it contains no lead metal. Graphite is a crystalline form, or allotrope, of carbon.

A liquid has no shape of its own, so it must be measured inside a vessel that expands at the same time.

G has the same value everywhere in the universe, for any two masses. The relation is Newton's law of universal gravitation: every two bodies attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.

The Kelvin and Fahrenheit scales read the same at about 574.25, which is about 301 degrees Celsius. The scales are linked by K = C + 273 and F = (9/5)C + 32.

The lens of the human eye is a converging (convex) lens, not a diverging one, so statement A is not correct.

The rod becomes negative because it gains electrons from the wool. When two materials are rubbed together, only electrons move, because they are the loosely held outer particles of atoms.

This is the Clausius statement of the second law. Rudolf Clausius stated that heat cannot by itself pass from a colder body to a hotter one; work must be done to make it do so.

Jharkhand has railway divisions such as Ranchi and Dhanbad, but no zonal headquarters. Indian Railways is organised into zones, each headed by a General Manager, and every zone is split into divisions.

Bats send out ultrasonic squeaks and listen for the echoes to locate obstacles and prey. This method is called echolocation.

The Dhanbad-Jamshedpur region is known for coal, iron and steel, not cotton textiles. Cotton mills grew where raw cotton, a humid climate, capital, cheap power and markets came together.

A rainbow forms when raindrops split white sunlight into its seven colours. When sunlight enters a raindrop, it is refracted, and because each colour bends by a different amount, the colours spread apart.

Washing soda is the crystalline form of sodium carbonate, Na2CO3·10H2O, sodium carbonate decahydrate. Sodium carbonate is made from common salt by the Solvay (ammonia-soda) process.