RRB Group D GK Questions 2026

The symbol of potassium is K, from its Latin name kalium; Po is the symbol of polonium, the radioactive element discovered by Marie Curie in 1898 and named after Poland.

Its chemical name is sodium hydrogen carbonate and its formula is NaHCO3. It is a mild, non-corrosive base made by the Solvay process, in which brine is treated with ammonia and carbon dioxide.

Ammonia is NH3, so one nitrogen atom of mass 14 is joined to three hydrogen atoms of mass 1 each, giving 14: 3 by mass.

A stalagmite is a column of calcium carbonate that rises from the floor of a limestone cave. Rainwater with dissolved carbon dioxide slowly dissolves limestone and carries it as calcium bicarbonate.

This is the overall literacy rate the Census of 2011 reported for India, the figure used in textbooks and exam papers.

All three rivers join the Yamuna, the longest tributary of the Ganga, which rises at the Yamunotri glacier in Uttarakhand and meets the Ganga at Prayagraj.

Geology is the science of the solid Earth: the rocks it is made of, how it formed and changed over time, and the minerals, coal, oil and gas found inside it.

Mohenjodaro lies on the right bank of the Indus in Larkana district of Sindh, now in Pakistan. It was excavated in 1922 by R. D. Banerji, and its name means 'mound of the dead'.

Article 64 makes the Vice President of India the ex-officio Chairman of the Council of States, the Rajya Sabha. Because he chairs a House he is not a member of, he has no ordinary vote and casts only a deciding vote when there is a tie.

Roasting means heating a sulphide ore strongly in plenty of air, so that the sulphide turns into an oxide and the sulphur escapes as sulphur dioxide gas.

Kwashiorkor is caused by a severe lack of protein in the diet, even when the child gets some calories from starchy food.

Mature red blood cells, or erythrocytes, lose their nucleus before they enter the blood. Losing the nucleus, and the mitochondria too, leaves more room for haemoglobin, the iron-rich protein that carries oxygen, and gives the cell its flexible biconcave disc shape, which lets it squeeze through narrow capillaries.

It is the main growth inhibitor among plant hormones and works against the growth promoters.

A lactometer floats in milk and shows its relative density. Pure milk is denser than water, so adding water lowers the density and the instrument sinks deeper, which reveals the adulteration.

The horsepower is an older practical unit of power that survives in the rating of engines, pumps and motors, and it equals about 746 watts.

The mole is the chemist's counting unit: one mole of any substance contains the Avogadro number of particles, about six followed by twenty-three zeros, whether those particles are atoms, molecules or ions.

A barometer measures the pressure of the atmosphere, traditionally by balancing it against a column of mercury. It is also used for forecasting weather, because a sudden drop in pressure signals an approaching storm, and for finding altitude, since pressure falls as one rises.

Work is force multiplied by displacement. Force has the dimensions M L T⁻², and multiplying it by a length adds one more power of L, which gives M L² T⁻².

Pressure is force divided by area, so its unit is one newton per square metre, which is given the name pascal after Blaise Pascal.

A light year is the distance that light, moving at about three lakh kilometres per second, covers in one year, which works out to roughly 9.46 trillion kilometres.