RRB Group D GK Questions 2026

Sound travels faster in warmer air, so statement I is wrong, while II and III are right. The speed of sound in a gas is v = √(γP/ρ).

Fungal cell walls are built mainly of chitin, whereas plant cell walls are built of cellulose. Chitin is a tough polysaccharide made of units of N-acetylglucosamine, a sugar that carries nitrogen.

This filarial roundworm causes elephantiasis, also called lymphatic filariasis. The adult worms live in the lymphatic vessels and block the flow of lymph, so the legs, arms or genitals swell and the skin thickens, giving the disease its name.

It is part of the kidney's nephron and filters blood to form urine; it plays no role in breathing. Bowman's capsule is the cup-shaped start of each nephron, wrapped around a tuft of capillaries called the glomerulus.

Boiling removes only temporary hardness; permanent hardness comes from salts that do not break down on heating. Temporary hardness is caused by the bicarbonates of calcium and magnesium.

For a real object, a concave lens always forms a virtual image, so this statement is wrong. A concave lens is a diverging lens: it spreads out parallel rays so that they seem to come from its focus on the same side as the object.

The N shell is the fourth shell (n = 4), and a shell can hold at most 2n² electrons, which gives 2 × 16 = 32.

The oesophagus, like the mouth, is lined by flat squamous epithelium that protects it from wear as food passes. Epithelial tissue covers body surfaces and lines organs, and its cells are named by shape.

Animal cells do have vacuoles; they are only small and often temporary, so the statement is wrong. A vacuole is a membrane-bound sac filled with cell sap: water, salts, sugars and waste.

The eye adjusts the focal length of its lens to bring both near and far objects into focus on the retina, and this ability is called accommodation.

Benzene and water do not mix, so they form two layers that a separating funnel can draw off one after the other.

James Chadwick discovered the neutron in 1932, the uncharged particle that sits in the nucleus alongside the proton. Chadwick bombarded beryllium with alpha particles and found that it gave off a penetrating radiation of neutral particles with a mass almost equal to that of a proton.

Among the four, microwaves lie farthest towards the long-wavelength end of the electromagnetic spectrum. In order of increasing wavelength the spectrum runs: gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves and radio waves.

Graphite has the lowest energy of all forms of carbon at ordinary temperature and pressure, so it is the thermodynamically most stable allotrope.

Using R = L/(σA) with equal lengths, the resistance of Y comes out three times that of X. Resistance falls as conductivity σ and cross-sectional area A rise.

Pressing for enforcement that leans on technology, Shri Bhupender Yadav said that joining the readings of Online Continuous Emission Monitoring Systems to data on how a plant is actually being operated is essential if malpractices are to be identified, and that artificial intelligence can play an important part in achieving…

Shri Bhupender Yadav presented a set of specific problem statements covering nine key areas of air pollution management and discussed with the innovators how their technologies could be adapted, scaled and deployed on the ground against each of them.

The interaction of 17 October 2026 between the Union Environment Minister and start-ups was one of a series of stakeholder engagements carried out under that campaign theme, which places a share of the responsibility for clean air on every citizen.

The correct answer is Shri Bhupender Yadav, the Union Minister for Environment, Forest and Climate Change, who met start-ups and innovation companies working on air pollution mitigation and himself put a set of problem statements covering nine key areas before them.

The thunder arrived 6 seconds after the flash, and sound covers 320 m every second, so the distance is 320 × 6 = 1920 m. Lightning and thunder are produced at the same moment.