CDS GK Questions 2026

The water at the bottom warms, becomes lighter and rises, while cooler water sinks to take its place, and these convection currents carry heat through the pot.

Dolomite is a carbonate of calcium and magnesium, a base that neutralises soil acidity and so raises the pH. Dolomite, CaMg(CO₃)₂, is a common liming material.

Three equal resistors R in parallel have a combined resistance of R/3, and at the same voltage the power, V²/R, becomes three times as large.

Both gain the same kinetic energy, but the electron is far lighter, so it moves much faster. A charge q accelerated through a potential difference V gains kinetic energy qV.

A perfectly horizontal rope has no upward component of tension, so no finite tension can hold up the 200 N weight with the rope fully straight.

Article 15(2) says no citizen can be denied access to, or the use of, wells, tanks, bathing ghats, roads and places of public resort maintained wholly or partly out of State funds, on grounds only of religion, race, caste, sex or place of birth.

The best-known Chandimangala, Chandimangal or Abhayamangal, was composed in Bengali by Mukundarama Chakravarti, honoured as Kavikankan, in the late 16th century.

Digestion begins in the mouth, where saliva adds salivary amylase to the food as it is chewed. Salivary amylase, also called ptyalin, starts breaking starch into maltose while food is still in the mouth.

Formed in April 1918 by B. P. Wadia among the textile workers of Madras, it is regarded as India's first trade union in the modern, organised sense.

All three features, richness in lime, iron, magnesia and alumina, a deep clayey and impermeable texture, and a spread over Maharashtra, Madhya Pradesh and Gujarat, describe the black or regur soil.

The stinging hairs on nettle leaves inject methanoic acid, also called formic acid, into the skin, which causes the burning pain.

Starlight bends as it passes through air layers of changing density, and because these layers keep moving, the star seems to flicker.

Momentum is mass times velocity, 10 × 10 = 100 N.s, and kinetic energy is half the mass times the square of the speed, ½ × 10 × 10 × 10 = 500 J. Linear momentum, p = mv, measures the quantity of motion and is a vector; its unit…

The Census defines a literate as a person aged seven or above who can both read and write with understanding in any language, so someone who can only read does not qualify.

A zeugen is a tabular ridge carved by wind abrasion in deserts, while a cirque is glacial and a stack is made by sea waves.

Free legal aid is a Directive Principle under Article 39A, and the Supreme Court has made it the duty of the police to inform the nearest Legal Aid Committee as soon as a person is arrested.

X-rays can pass through solid materials and their wavelength is close to the spacing of atoms, so they serve both purposes.

This is the statement that is not correct; the other three describe the benzene molecule correctly, and UPSC's official key also gives D. Benzene, C6H6, is a flat ring of six carbon atoms.

Statement 2 is the only incorrect one, because a compound always has a fixed composition, not a variable one. An element is the simplest form of matter and cannot be broken down into simpler substances by chemical reactions, so statement 1 is correct.

It is the Finance Ministry's nodal department for economic policy, at home and abroad, including the management of foreign exchange.