NDA GK Questions 2026

Light keeps to a straight line only while its speed stays the same, which happens in a homogeneous, transparent medium.

. Cathode rays behave the same whatever gas is in the tube, so the statement that they depend on the gas is not correct.

Pragyan was a six-wheeled rover carried inside the Vikram lander. Chandrayaan-2 was launched on 22 July 2019 by the GSLV Mk III with an orbiter, the Vikram lander and the Pragyan rover.

Silver reacts with sulphur compounds in the air, mainly hydrogen sulphide, and forms a black coating of silver sulphide. This blackening is the tarnishing of silver, a kind of corrosion.

Article 80(3) lists literature, science, art and social service as the fields for the President's nominations, and state service is not among them.

Only the Abyssinian plateau (Africa) and the Anatolian plateau (Asia) are matched with the right continent. The Abyssinian or Ethiopian plateau is a high volcanic tableland in the Horn of Africa, where the Blue Nile rises from Lake Tana.

The IUCN publishes the Red List of Threatened Species, the world's main list of species at risk. The IUCN was founded in 1948 and has its headquarters at Gland in Switzerland.

The word 'algorithm' comes from the Latin form of his name, Algoritmi, used in translations of his work on Hindu-Arabic numerals.

Lonar was formed by a meteorite impact, and its rocks contain maskelynite, a natural glass that forms only under such high-velocity impacts and is also found in lunar rocks.

Osmosis is the passage of water from where water is more concentrated (a dilute solution) to where it is less concentrated, across a membrane that lets water through but holds back solutes.

In Koeppen's scheme B marks dry climates, and the letter W, from the German Wüste meaning desert, marks the driest of them.

Medieval sieges aimed to starve a city into surrender, so Vijayanagara kept fields and food inside its walls. The Persian ambassador Abdur Razzaq, who visited in the 1440s, described seven lines of fortification around the city, with fields, gardens and houses between them.

Ferromagnetism needs the atomic magnets of a substance to line up together in fixed regions called domains, and this happens only in the ordered structure of a solid.

Chemical reactions involve only the outer, or valence, electrons, so these decide how an element behaves. Atoms combine by losing, gaining or sharing their valence electrons to reach a stable arrangement, usually eight electrons in the outer shell.

Jean-Jacques Rousseau, the Geneva-born philosopher, published The Social Contract (Du contrat social) in 1762.

The Himalayas were formed by the collision of two continental plates, the Indian and the Eurasian, and such a collision does not produce volcanoes.

Animal cells are bounded only by a flexible plasma membrane and have no rigid cell wall outside it. A cell wall is found in plants, where it is made mainly of cellulose, in fungi, where it is made of chitin, and in bacteria, where it is made of peptidoglycan.

Cytokinins are the plant hormones whose main job is to promote cell division, or cytokinesis, which gives them their name.

THAAD, properly the Terminal High Altitude Area Defense, is a United States system built to shoot down ballistic missiles in the last, or terminal, phase of their flight.

The Indian part of the Indus basin covers all six, along with Chandigarh. The Indus rises near Lake Mansarovar in Tibet and enters India in Ladakh.