NDA GK Questions 2026

After troops under General Dyer fired on a gathering at Jallianwala Bagh in Amritsar on 13 April 1919, Tagore wrote to the Viceroy, Lord Chelmsford, on 31 May 1919, renouncing the knighthood conferred on him in 1915.

Gandhi had been awarded the Kaiser-i-Hind in 1915 for raising an ambulance corps in South Africa, and in 1920 he returned it in a letter to the Viceroy, giving up two South African war medals at the same time, as part of the surrender of titles and honours that the…

Queen Victoria instituted the Kaiser-i-Hind Medal in 1900 for distinguished public service in India, and unlike the orders of chivalry it was open to any person of any rank, Indian or European, man or woman, in gold, silver and bronze classes.

The Order of the Star of India was created in 1861, four years after the Revolt of 1857, to tie the princely rulers and senior officials of India to the British Crown, and its motto was Heaven's light our guide; it was given three classes in 1866, the Knight Grand…

A good fuel should have a moderate ignition temperature, not a very low one.

Destructive distillation means heating coal strongly in the absence of air, so that it decomposes instead of burning. The solid left behind is coke, which is almost pure carbon and is used as a reducing agent in the extraction of iron and other metals and as a smokeless fuel.

When the oxygen supply is short, the carbon of the fuel is only partly oxidised and carbon monoxide is formed instead of carbon dioxide.

It is the lowest temperature to which a combustible substance must be heated before it begins to burn, and it is a fixed property of that substance; substances with a very low ignition temperature, such as petrol, alcohol and liquefied petroleum gas, are called inflammable substances and are stored with…

Carbon dioxide is about one and a half times as dense as air, so when released it forms a blanket over the burning material and separates it from atmospheric oxygen, removing one side of the fire triangle.

Petrol and kerosene are lighter than water and do not mix with it, so water poured on an oil fire sinks below the burning layer and carries it outwards, enlarging the fire instead of putting it out.

Coal forms by the slow burial and compression of plant matter, and the longer and deeper the process goes the more carbon is left behind as moisture and volatile matter are driven off.

Liquefied petroleum gas is obtained during the refining of petroleum and from natural gas processing, and it is chiefly a mixture of butane and propane, which liquefy under moderate pressure at ordinary temperature and so can be stored in a cylinder.

Its calorific value is about 150 kilojoules per gram, the highest of any known fuel, roughly three times that of petrol, and its only combustion product is water vapour, which makes it a clean fuel as well.

In this zone the supply of air is unrestricted, so combustion is complete and all the carbon of the fuel is converted to carbon dioxide, releasing the maximum heat.

Calorific value is the heat released on completely burning one gram of a substance, and among the four foods listed ghee has the highest, because it is almost entirely fat.

In spontaneous combustion a substance catches fire by itself, without any external flame being brought near it.

The space agency made the engine by fusing metal powder with a laser and tested it successfully, reducing the number of separate parts in the engine from fourteen to a single printed piece and cutting both the material used and the time taken to build it.

Because the model receives readings from the real machine, building or city as it works, it behaves as the real asset behaves, and engineers can test a change, foresee a failure or plan maintenance on the model without disturbing the original.

The strategy was released by that ministry in 2022 to build a domestic ecosystem for additive manufacturing, covering machines, materials and software, the creation of Indian intellectual property and the skilling of workers, in line with the Make in India and self-reliance programmes.

The country's first 3D-printed post office was built at Cambridge Layout in Bengaluru and opened in 2023, its walls laid down by a concrete printing robot working from a digital design, with technical guidance from an Indian Institute of Technology.