CDS GK Questions 2026

The test was carried out in the desert at Pokhran in Rajasthan on 18 May 1974 and was described by India as a peaceful nuclear explosion; Raja Ramanna led the team.

The second stage uses the plutonium 239 recovered from the spent fuel of the first stage as the fuel of a fast breeder reactor, with a blanket of thorium around the core that is converted into uranium 233; a breeder produces more fissile material than it burns, which is how…

Apsara went critical at Trombay near Mumbai on 4 August 1956 and was the first nuclear research reactor not only in India but in the whole of Asia; the CIRUS reactor of 1960 and the Dhruva reactor of 1985 were built at the same site, which is today the Bhabha…

Bhabha founded the Tata Institute of Fundamental Research in 1945, became the first chairman of the Atomic Energy Commission in 1948, drew up the three stage plan built around India's thorium, and led the establishment at Trombay that was renamed the Bhabha Atomic Research Centre after his death in 1966.

In a boiling water reactor, the design used at Tarapur, ordinary water is allowed to boil inside the reactor vessel itself, so the coolant leaving the core is a mixture of water and steam; the steam is separated at the top and driven straight to the turbine, without the separate…

The CANDU design, from which India's pressurised heavy water reactors descend, burns natural uranium, and natural uranium contains only about seven parts in a thousand of the fissile isotope uranium 235.

The Tarapur Atomic Power Station in Maharashtra was commissioned in 1969 with American assistance and was the first nuclear power station in India as well as in Asia; its first two units are boiling water reactors, a design used nowhere else in the country.

Chilika is a shallow lagoon on the Bay of Bengal coast, separated from the sea by a sandy ridge and joined to it by a narrow mouth, which is why its water is brackish.

The Montreux Record lists Ramsar sites where the ecological character has changed, is changing or is likely to change because of pollution, encroachment, siltation or other interference, so that the parties can direct attention and assistance there.

Charles Darwin explained its formation: a fringing reef grows around a volcanic island, the island slowly subsides, the reef keeps growing upward towards the light, and in the end only a ring of reef and a lagoon are left where the island stood.

Its water is muddy, its tidal range is among the highest in the country and several rivers empty into it, so the clear, silt-free conditions that corals need are absent; it is known instead for tidal energy potential.

These single-celled algae live within the tissue of the coral polyp, photosynthesise, hand most of the food they make to the polyp and give the reef its colour; the polyp in return offers shelter and nutrients, a textbook case of symbiosis.

Mangrove mud is waterlogged and short of oxygen, so these roots grow vertically out of the soil and take in air through small pores called lenticels; they are the classic adaptation asked about in examinations, along with stilt roots and vivipary.

It is named after the sundari tree, holds the only mangrove population of the Royal Bengal tiger, and the Indian portion is a national park, a biosphere reserve and a World Heritage Site.

Keibul Lamjao National Park rests on these mats and is the last natural home of the sangai, the brow-antlered deer of Manipur.

The correct answer is B, 2 February, the anniversary of the signing of the Ramsar Convention in 1971, which is why the day carries that date.

The convention takes its name from Ramsar, a town on the Caspian coast of Iran, where it was signed on 2 February 1971; it came into force in 1975 and is the oldest of the modern global environmental treaties.

The Harike Wetland in Punjab was created by building a barrage just below the point where the Beas joins the Sutlej, so the first pair is correct and it is the only one.

These twin lakes lie near Jammu in the Jammu and Kashmir region, not in Uttar Pradesh, so they are the odd one out in this list.

It grew out of a department for non-conventional energy sources created in 1982, became a full ministry in 1992 and took its present name in 2006, and India is among the very few countries in the world to have a separate ministry devoted to this sector.