RRB Group D GK Questions 2026

The sting of an ant and the hairs of the nettle plant inject formic acid, also called methanoic acid, which is why the skin burns; rubbing on a mild base such as baking soda or the leaf of the dock plant relieves it by neutralising the acid.

Baking soda is sodium hydrogen carbonate, a mild, non corrosive base used as an antacid, as an ingredient of baking powder along with a mild edible acid such as tartaric acid, and in soda acid fire extinguishers, where it releases carbon dioxide.

Borax, sodium tetraborate, is the salt of a strong base, sodium hydroxide, and a weak acid, boric acid, so its solution in water is basic.

The pH is the negative logarithm of the hydrogen ion concentration, so each rise of one unit means the concentration has fallen to one tenth.

Citrus fruits such as orange, lemon, lime and grapefruit owe their sharp sour taste to citric acid, which is the acid textbooks name for this family and the one examiners expect here.

The eastern coastal plain is divided into three named stretches, and the southern one, running along Tamil Nadu, is the Coromandel coast; it receives much of its rain from the retreating north-east monsoon in October and November, unlike the rest of India.

Lying mainly in Jharkhand with parts in Odisha, Chhattisgarh and West Bengal, and drained by the Damodar, it holds India's richest concentration of coal along with iron ore, mica, bauxite and copper; the cluster of collieries, steel plants and power stations along the Damodar has earned it the nickname Ruhr…

The southern section of the western coastal plain, lying in Kerala, is called the Malabar coast, and it is distinguished by its kayals, the shallow lagoons and backwaters such as Vembanad and Ashtamudi that are linked into an inland waterway.

Towards the end of the Cretaceous period, fissure eruptions poured out sheet after sheet of lava over western and central India; the hardened lava is basalt and the stepped landscape it makes is called the Deccan Trap.

Chilika lies on the Utkal coast of Odisha, separated from the Bay of Bengal by a long sandbar, and it is the largest brackish-water lagoon in India, famous for its migratory birds and for its population of Irrawaddy dolphins.

The Narmada flows west between the Vindhyan range and the Satpuras along a trough formed by faulting, that is, a rift valley, and it empties into the Gulf of Khambhat through a broad estuary rather than a delta.

The Palakkad Gap, also spelt Palghat, is the widest break in the Western Ghats, lying between the Nilgiri hills to the north and the Anaimalai hills to the south.

Anaimudi rises to about 2,695 metres in the Anaimalai hills of Kerala, south of the Palakkad Gap, and it is the highest summit anywhere in the Peninsular Plateau and indeed in India south of the Himalayas.

Doddabetta, about 2,637 metres high, is the highest point of the Nilgiri hills, the block where the Western Ghats and the Eastern Ghats meet, and it overlooks the hill station of Udhagamandalam or Ooty in Tamil Nadu.

Gujarat has the longest coastline of any Indian state. Its shore runs from the Rann of Kachchh round the Gulf of Kachchh, along the whole Saurashtra or Kathiawar peninsula and down the Gulf of Khambhat, and this deeply indented outline gives it far more shore than any other state.

Soil acidity is measured on the pH scale, and pH depends on the concentration of hydrogen ions in the soil water.

The carbohydrates in our food are broken down into glucose, and the glucose that the body does not need at once is stored as glycogen, a branched chain of glucose units kept mainly in the liver and the skeletal muscles.

After Guru Gobind Singh died at Nanded in 1708, Banda Singh Bahadur led the Sikhs in revolt against Mughal rule in Punjab.

The left atrium is the chamber that receives oxygen-rich blood coming back from the lungs through the pulmonary veins. From there the blood passes the bicuspid or mitral valve into the left ventricle, which pumps it out through the aorta to the whole body.

The Eskimos, who call themselves Inuit, live in the polar region, that is the Arctic lands of Greenland, northern Canada, Alaska and eastern Siberia.