CDS GK Questions 2026

For a real object, a concave lens always forms a virtual image, so this statement is wrong. A concave lens is a diverging lens: it spreads out parallel rays so that they seem to come from its focus on the same side as the object.

The N shell is the fourth shell (n = 4), and a shell can hold at most 2n² electrons, which gives 2 × 16 = 32.

The oesophagus, like the mouth, is lined by flat squamous epithelium that protects it from wear as food passes. Epithelial tissue covers body surfaces and lines organs, and its cells are named by shape.

Animal cells do have vacuoles; they are only small and often temporary, so the statement is wrong. A vacuole is a membrane-bound sac filled with cell sap: water, salts, sugars and waste.

The eye adjusts the focal length of its lens to bring both near and far objects into focus on the retina, and this ability is called accommodation.

Benzene and water do not mix, so they form two layers that a separating funnel can draw off one after the other.

The words come from the Quit India Resolution passed by the All India Congress Committee in Bombay on 8 August 1942.

Fronts bring abrupt, not slow, changes in weather, so statement 1 is wrong while 2 and 3 are right. A front is the boundary zone where two air masses of different temperature and density meet, mostly in the middle latitudes.

In India's land-use classification, land left uncultivated for more than five years is recorded as culturable waste land. India's land records divide area into nine categories.

James Chadwick discovered the neutron in 1932, the uncharged particle that sits in the nucleus alongside the proton. Chadwick bombarded beryllium with alpha particles and found that it gave off a penetrating radiation of neutral particles with a mass almost equal to that of a proton.

Among the four, microwaves lie farthest towards the long-wavelength end of the electromagnetic spectrum. In order of increasing wavelength the spectrum runs: gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves and radio waves.

Graphite has the lowest energy of all forms of carbon at ordinary temperature and pressure, so it is the thermodynamically most stable allotrope.

Using R = L/(σA) with equal lengths, the resistance of Y comes out three times that of X. Resistance falls as conductivity σ and cross-sectional area A rise.

The Vijayanagara ruler, keen on a steady supply of Arabian and Persian horses through the Portuguese, allowed them to build a fort at Bhatkal on the Kanara coast.

Section 104 of the Government of India Act, 1935 vested residuary powers in the Governor-General, who could assign a subject to either the Centre or a province.

Bandarpunch feeds the Yamuna, Bara Shigri the Chenab and Siachen the Nubra; pairs 3 and 5 are wrong. The Yamunotri glacier, the source of the Yamuna, lies on the western slopes of the Bandarpunch massif in Uttarakhand.

From smallest to largest, several parganas made a sarkar and several sarkars made a suba. Under the Mughals, especially after Akbar's reorganisation of 1580, the empire was divided into subas or provinces, each headed by a subedar with a diwan in charge of revenue.

A strong solar storm disturbs the Earth's magnetic field and upper atmosphere, which hits electrical and radio systems, but it cannot cause tsunamis or forest fires.

Inamgaon is a Chalcolithic site in Maharashtra and Mangadu is a megalithic site in Kerala; rows 1 and 4 each have an error.

Samudrayaan is part of the Deep Ocean Mission and its vehicle Matsya-6000 is built to take three people into the deep sea; the mission belongs to the Ministry of Earth Sciences.