RRB Group D GK Questions 2026

Fleming noticed in 1928 that a mould of the genus Penicillium had killed the bacteria growing around it on a culture plate, and the substance he named penicillin became the first antibiotic; Florey and Chain later turned it into a usable drug and shared the Nobel Prize with him.

The Swedish chemist Alfred Nobel patented dynamite in 1867, a safe way of handling nitroglycerine, and the fortune he made from explosives endowed the Nobel Prizes, first awarded in 1901.

Bell received the patent for the telephone in 1876 and made the first call over a wire, carrying the human voice itself rather than a code.

Paul Hermann Muller is remembered for showing that DDT kills insects, work for which he received a Nobel Prize in Physiology or Medicine; vitamin D is associated with Edward Mellanby, who linked its absence to rickets, and with Adolf Windaus, who worked out its chemistry.

In 1796 Jenner showed that material from a cowpox sore protected a boy against smallpox, the first deliberate vaccination, and the word vaccine itself comes from vacca, the Latin for cow.

Roentgen, a German physicist, noticed in 1895 that a screen in his darkened laboratory glowed while a covered discharge tube was running, and he named the unknown radiation X-rays.

A volleyball court is a rectangle 18 metres long and 9 metres wide, divided into two square halves of 9 metres by 9 metres by the centre line, above which the net is fixed at 2.43 metres for men and 2.24 metres for women.

In field hockey a bully was the method of restarting play after certain stoppages: one player of each side stood facing the other over the ball and they tapped sticks and ground alternately before playing it.

The distance was fixed after the London Olympic Games of 1908, where the course was lengthened to finish in front of the royal box, and it has been the standard ever since.

A table tennis ball is 40 millimetres across and weighs 2.7 grams, and it is made of plastic with a matt white or orange surface.

The correct answer is A, 1.524 metres, that is five feet at the centre of the court, with the net standing slightly higher, 1.55 metres, at the posts.

A chukker is one period of play in polo, and a match is made up of several chukkers with breaks between them so that the ponies can be changed.

A water polo team plays with seven players in the pool, six field players and one goalkeeper, with substitutes on the bench.

The ring, or basket, is fixed with its upper edge 3.05 metres above the floor, that is exactly 10 feet, and the measurement has not changed since the game was invented by James Naismith in 1891.

The Laws of Cricket fix the pitch at 22 yards between the two bowling creases, that is between the two sets of stumps, which works out to about 20.12 metres; the pitch is 10 feet wide.

Pivoting is the legal turn in which a player holding the ball keeps one foot fixed on the floor, the pivot foot, and steps around with the other foot; it lets a player face the basket or protect the ball without being called for travelling.

In golf an albatross, also called a double eagle, means holing out in three strokes fewer than the par of that hole, which is among the rarest feats in the game.

An offside trap is a defensive tactic in which the defenders move up the field together at the right moment so that an attacking player is left beyond the last defender when the ball is played forward, and the referee then gives offside.

India proposed the observance at the United Nations, the General Assembly adopted the resolution in 2014 with the support of a very large number of member states, and the first International Day of Yoga was observed on 21 June 2015.

The General Assembly declared 2025 the International Year of Glaciers' Preservation, to draw attention to the melting of glaciers that feed rivers such as the Ganga, the Indus and the Brahmaputra and to the risk this carries for water supply and for floods.