Defence GK Questions 2026

Of the three forms of carbon, only fullerenes are made of closed, hollow, cage-like molecules. The best-known fullerene is buckminsterfullerene, C60, a hollow sphere of 60 carbon atoms arranged in 20 hexagons and 12 pentagons, shaped like a football.

The Taklamakan lies in the Tarim Basin of Xinjiang in north-western China, in the heart of Central Asia. The Taklamakan is a cold, sandy desert ringed by high mountains: the Kunlun to the south, the Tian Shan to the north and the Pamirs to the west.

A simple periscope has two plane mirrors, and light reaches the eye only by bouncing off them. In a simple periscope, two plane mirrors are fixed parallel to each other at the two bends of a long tube, each tilted at 45° to its length.

A mixture of carbon monoxide and hydrogen is called synthesis gas, or syngas, because it is the starting material for making methanol and many other compounds.

This is sodium stearate, the sodium salt of a long-chain fatty acid, which makes it a soap and not a synthetic detergent.

This statement is false: water is a strongly polar molecule. In a water molecule the oxygen atom is much more electronegative than hydrogen, so it pulls the shared electrons towards itself and carries a partial negative charge, while the two hydrogens carry partial positive charges.

This is the incorrect statement: the world has 36 recognised biodiversity hotspots, far fewer than 100. The hotspot idea came from the British ecologist Norman Myers, who in 1988 named ten tropical forest regions that were very rich in species and under heavy threat.

Argon has atomic number 18, and a neutral atom has as many electrons as protons, so it has 18 electrons.

X-rays have wavelengths of roughly 0.01 nm to 10 nm, so 1 nm sits right inside the X-ray band. The electromagnetic spectrum runs, from the shortest wavelength to the longest, as gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves and radio waves.

Meiosis makes gametes that differ from one another, and fertilization joins a gamete from each of two parents, so every offspring gets a new mix of genes.

Statements 2 and 3 are correct; statement 1 is wrong because the earliest inscriptions are in Prakrit, not Sanskrit.

The standard account of Mughal-era agriculture records that maize came into India via Africa and Spain, and by the seventeenth century it was listed among the major crops of western India.

Work is W = F × d × cos θ, and when the angle θ between force and displacement is 90°, cos 90° = 0, so the work done is zero.

As an object comes in from far away towards C, its real, inverted image moves out from the focus towards C, and the two meet at C. For a concave mirror, an object at infinity forms its image at the focus F, and an object at the centre of curvature…

To just complete a vertical circle, a bob on a string needs a speed of at least √(5gL) at the lowest point, and √(5 × 10 × 0.5) = √25 = 5 m/s. A string can only pull, never push.

Promoting alternative development, including the growing of alternative crops in place of illicit ones, is a mandate the bureau carries under this policy, which is why the public dialogue at Malana village formed part of the operation rather than being an extra.

The Central Bureau of Narcotics is the country's apex drug law enforcement and regulatory agency and it sits under the Department of Revenue in the Ministry of Finance, a placement that surprises candidates and therefore makes a good question.

The Central Bureau of Narcotics carried out its destruction drive in Kullu district, clearing 5,165 acres, or 2,070 hectares, of illicit cannabis cultivation over one month.

Four persons were arrested under its provisions, namely two proprietors or partners of importing firms, a customs broker's G-card holder, and the owner of a Dubai-based supplier who had also floated an importing firm in his father's name.

The salt was shipped through Colombo Port in Sri Lanka and then sent on to India, a third-country route meant to break the visible link with Pakistan.