CDS GK Questions 2026

Energy passes one way from the Sun through the food chain and is lost as heat, while nutrients are used again and again.

Cetane is the common name of n-hexadecane, C16H34, a straight-chain alkane with sixteen carbon atoms. Cetane ignites very readily when compressed, which is exactly what a diesel engine needs, because diesel fuel is not lit by a spark but catches fire from the heat of compressed air.

A kunta is a spear or lance, a thrusting weapon, while the other three are Sanskrit names for the bow.

In Bankim Chandra Chattopadhyay's Bengali novel Anandamath (1882), the monk-rebels are shown three images of the Mother Goddess standing for the motherland: as she was, as she is and as she will be.

Nanda Devi National Park lies in the Chamoli district of Uttarakhand, around India's second-highest peak, Nanda Devi. The park is a vast glacial basin ringed by high peaks and was inscribed on the UNESCO World Heritage list in 1988 for its wild, untouched landscape.

A gamma ray is a photon of energy with no mass and no charge, so emitting it leaves the count of protons and neutrons unchanged.

Loktak Lake lies in the valley of Manipur, south of Imphal, and is the largest freshwater lake in north-east India.

Plaster of Paris mixed with water sets within minutes into a hard mass, which is why doctors use it to make casts that hold broken bones in place.

Nereis, the sandworm, moves with parapodia, paired fleshy flaps on the sides of its body segments, not with pseudopodia. Nereis is a marine annelid.

Census 2011 put their densities at about 17, 52, 86 and 123 persons per square kilometre, in that order. Arunachal Pradesh, with steep, forested mountains and a small population spread over a large area, has the lowest population density of any Indian state at 17 persons per sq km.

Saurabh Chaudhary is an Indian pistol shooter who competes in the 10 metre air pistol event. Born in 2002 in a farming family of Kalina village near Meerut, Uttar Pradesh, he burst onto the scene as a teenager.

Physiological density divides the total population by the area of arable or net cultivated land, showing how many people each unit of farmland must support.

Many sellers of an identical product, none of whom can change the price, is the definition of a perfectly competitive market.

The International Labour Organisation put it forward in the 1970s, asking that every person first have the essentials of a decent life.

Khema was a Buddhist nun, not a Jain teacher; the other three are well-known Jain acharyas. Khema was a queen of King Bimbisara of Magadha who became a disciple of the Buddha and joined the order of nuns.

Farming needs large areas of land, while most non-farm work, such as a shop, a dairy, transport or small manufacturing, can be carried out on very little land.

The pull of the Sun and Moon raises the tides, the regular rise and fall of the sea, but it is not counted among the forces that drive ocean currents.

In grasses the intercalary meristem lies at the base of the leaf blades and internodes, between tissues that are already mature.

Evaporation from the leaves pulls a continuous column of water up the xylem, and cohesion and adhesion keep that column from breaking.

Global dimming is the drop in sunlight reaching the ground, and the cooling that follows, caused by particles in the air.