Railway GK Questions 2026

Koneru Humpy, from Andhra Pradesh, is one of India's greatest chess players and among the strongest women players in the world.

When red and green light are added together, the eye sees yellow. Red, green and blue are the primary colours of light.

Outside a long straight wire, the field is B = μ₀I/(2πr), so doubling the distance halves the field. This result follows from Ampère's circuital law, or from the Biot–Savart law applied to a long wire.

Sugar dissolves in water as whole, neutral molecules and releases no ions, so its solution does not conduct electricity. A solution conducts only when it contains free ions that can carry charge between the electrodes.

Prokaryotic cells, such as bacteria, have no true nucleus; their DNA lies free in the cytoplasm in a region called the nucleoid.

While collecting nectar, a honey-bee carries pollen from one flower to the stigma of another, which lets the plant form seeds.

Heating weakens the attraction between the molecules of a liquid, so its surface pulls less tightly. Surface tension arises because molecules at the surface are pulled inward by their neighbours, making the surface behave like a stretched skin.

For any real object, a convex mirror forms a virtual, erect and smaller image behind the mirror, between the pole and the focus.

A metal filament's resistance rises as it heats up, so the current falls and the resistor gets a smaller share of the voltage.

The stinging hairs of the nettle plant inject methanoic acid, also called formic acid, into the skin. Each nettle hair is a fine, brittle tube that breaks on touch and pushes its contents into the skin like a tiny needle.

It contains hydrochloric acid and has a pH of about 1.5 to 2, the lowest of the four, so it has the most hydrogen ions.

A nanometre is 10⁻⁹ m and an ångström is 10⁻¹⁰ m, so one nanometre holds ten ångströms.

A plane mirror forms an image behind the mirror where light only seems to come from, with left and right swapped.

Electric power equals voltage times current, so the current is 60 W ÷ 240 V = 0.25 A. The relation P = VI comes straight from the definitions: voltage is energy per unit charge and current is charge per second, so their product is energy per second, or power.

Its density is about 0.86 g/cm³, less than that of water, so it floats while it reacts. Potassium is an alkali metal, soft enough to cut with a knife.

Bacteria have peptidoglycan walls and animal cells have no wall, but fungal walls are made of chitin, not cellulose. Statement 1 is correct: peptidoglycan, also called murein, is a mesh of sugars cross-linked by short peptides; penicillin works by blocking its formation.

Meiosis halves them in the gametes, and fertilisation restores them in the offspring. Each parent makes gametes by meiosis, so a human egg or sperm carries 23 chromosomes instead of 46.

Two vanadium atoms must balance five oxide ions, each of charge −2, so each vanadium carries +5. In a neutral compound the oxidation states add up to zero.

A liquid boils when its vapour pressure rises to match the pressure of the air above it. As a liquid is heated, more molecules escape as vapour and its vapour pressure climbs.

When light enters a denser medium, its wavelength is divided by the refractive index of that medium. The frequency of light is fixed by its source and does not change on refraction.