NDA GK Questions 2026

It is a spiral galaxy of a few hundred billion stars, and the solar system lies in one of its spiral arms, far from the centre, which is why we see the galaxy edge on as a milky band across the night sky.

It appears brightest because it is both luminous and close, about 8.6 light years away, and it is in fact a binary system with a white dwarf companion.

A geostationary satellite is placed in a circular orbit about 35,786 kilometres above the equator, where its period of revolution equals the period of rotation of the earth about its axis, and it moves from west to east like the earth, so it appears to stay over the same point…

Being a red dwarf it cannot be seen with the naked eye, although it is the closest star to us after the Sun.

A light year is the distance travelled by light in vacuum in one year, which is about 9.46 times ten to the power twelve kilometres, or roughly nine and a half trillion kilometres.

A satellite is given the required height and speed by its launch vehicle, and after that no engine is needed: the gravitational pull of the earth alone acts on it and provides the centripetal force that keeps it in a curved path, so the satellite keeps falling towards the earth…

A star is so far away that it is a point source of light.

In the core of the Sun, at a temperature of about fifteen million kelvin, four hydrogen nuclei combine through the proton-proton chain to form one helium nucleus.

The League of Nations, proposed in the Fourteen Points of President Woodrow Wilson and created under the Treaty of Versailles, began work in 1920 with its headquarters at Geneva in Switzerland; it failed to stop aggression in Manchuria, Abyssinia and Europe and was replaced by the United Nations in 1945.

The United States dropped an atomic bomb on the Japanese city of Hiroshima on that day, and the date is observed worldwide as Hiroshima Day.

Germany invaded Poland on 1 September 1939, and Britain and France, which had guaranteed Polish independence, declared war on Germany two days later, turning the attack into a world war.

The treaty was signed in the Hall of Mirrors at Versailles on 28 June 1919, five years to the day after the Sarajevo assassination.

The heir to the Austro-Hungarian throne was shot at Sarajevo in Bosnia on 28 June 1914 by Gavrilo Princip, a Serbian nationalist, and Austria-Hungary declared war on Serbia a month later, after which the alliance system drew in the other powers.

In the October Revolution, which took place on 7 November 1917 by the Western calendar, the Bolshevik party led by Lenin overthrew the provisional government and took power in Petrograd, with Leon Trotsky organising the Red Guards.

Watt added a separate condenser to the earlier Newcomen engine, patenting it in 1769, which made the steam engine efficient enough to drive factories, mines, railways and ships, and the unit of power is named after him.

He was the principal author of the Declaration of Independence adopted by the Continental Congress on 4 July 1776, and he later became the third President of the United States.

His book The Social Contract, published in 1762, argued that legitimate political authority comes from the general will of the people and not from the divine right of a king, and it became the intellectual charter of the French Revolution.

On that day a Paris crowd attacked the Bastille, a royal fortress used as a prison, which stood for the arbitrary authority of the monarchy; the date is celebrated in France as the national day.

Cytokinins promote cytokinesis, that is cell division; kinetin was the first of them to be identified, from the degraded DNA of herring sperm, and zeatin, the natural form, was obtained from maize grains.

Jute is a bast or stem fibre taken from the inner bark of plants of the genus Corchorus, extracted by soaking the cut stems in water, a process called retting, and India and Bangladesh are the main producers.