NDA 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.

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.

Aleppo is in Syria and Mazar-i-Sharif is in Afghanistan; Kirkuk and Mosul are both in Iraq. Aleppo, in north-western Syria, is one of the oldest continuously inhabited cities in the world, and its old city with the citadel is a UNESCO World Heritage Site.

Albania lies on the Adriatic, Kazakhstan on the Caspian and Morocco on the Mediterranean. The Adriatic Sea separates Italy from the Balkan coast of Slovenia, Croatia, Bosnia and Herzegovina, Montenegro and Albania.

The All India Congress Committee passed it at its Bombay session on 8 August 1942. The meeting was held at Gowalia Tank Maidan, now called August Kranti Maidan, in Bombay.

On the night of 2-3 December 1984, methyl isocyanate (MIC) gas leaked from the Union Carbide pesticide plant in Bhopal.

Seasons happen only because the Earth's axis is tilted to the plane of its orbit. The Earth's equatorial plane is inclined at about 23.5 degrees to the plane of its orbit, so its axis makes an angle of about 66.5 degrees with that plane.

The thunder arrived 6 seconds after the flash, and sound covers 320 m every second, so the distance is 320 × 6 = 1920 m. Lightning and thunder are produced at the same moment.