Railway GK Questions 2026

The system was a work of pure mathematics for decades until Claude Shannon showed that it described electrical switching circuits exactly, which opened the way to digital computing.

In Boolean algebra a literal is any single appearance of a variable in an expression, whether it appears plain or with a bar over it.

An exclusive OR gate is a difference detector: it gives 1 for the combinations 0 and 1 or 1 and 0, and gives 0 when the inputs agree.

De Morgan's second theorem states that NOT of A AND B equals NOT A OR NOT B. The working rule is to break the bar and change the sign, so a dot under a complement becomes a plus once the complement is distributed over the variables.

Each of these gates alone is enough to build every other gate and so every logic circuit: a NAND with its two inputs tied together acts as a NOT, two NANDs in sequence give an AND, and a suitable arrangement of three gives an OR, and the same can be…

Read the table row by row. The output is 0 only when both inputs are 0, and it is 1 in the other three rows, including the row where both inputs are 1.

Ashadh ka Ek Din imagines the poet Kalidasa torn between his village love and the glory offered by the court at Ujjayini, and it is counted the first fully modern Hindi play; Aadhe Adhure and Lahron ke Rajhans are his other major works.

Tughlaq uses the reign of Muhammad bin Tughlaq to speak about idealism turning into failure, and Hayavadana draws on a tale from the Kathasaritsagara about exchanged heads; Nagamandala and Yayati are also his, and he received the Jnanpith Award.

A Doll's House ends with Nora leaving her husband and her children, a conclusion that scandalised audiences and made the play a landmark of realistic social theatre; Ghosts and An Enemy of the People belong to the same phase of his work.

Pygmalion, in which a professor of phonetics trains a flower girl to speak like a duchess, is his most widely known play, and his others include Arms and the Man, Man and Superman and Saint Joan.

In Waiting for Godot two tramps pass the time by a bare tree waiting for a man who never arrives, and the play became the defining work of the Theatre of the Absurd, the movement that refused ordinary plot and meaning in order to show life as it felt after…

The Natyashastra lays down the rules of the stage, of acting, gesture, music and stagecraft, and gives the theory of rasa, the set of aesthetic moods a performance is meant to create in its audience; it is the foundation of all later Indian dramatic and dance theory.

Swapnavasavadattam, the dream of Vasavadatta, turns on King Udayana and his queen and is regarded as his finest work; Urubhanga and Pratima Nataka are also his.

It tells the story of King Pururavas and the celestial nymph Urvashi.

Mudrarakshasa is a political drama whose plot turns on the statecraft of Chanakya as he brings down the Nandas and places Chandragupta Maurya on the throne, and historians use it as a literary source for that change of dynasty.

Mrichchhakatika is a ten-act play about the love of a poor Brahmin merchant for a courtesan, set against a palace revolution, and its English title The Little Clay Cart comes from a toy cart that appears in the story.

The correct answer is B, Kamaljit Sandhu, who won the four hundred metres at the Asian Games in Bangkok in 1970 and became the first Indian woman to win an individual gold at those Games.

The correct answer is A, Koneru Humpy, who earned the Grandmaster title in 2002 as a teenager and went on to win the world women's rapid chess championship in 2019.

The correct answer is B, Arati Saha, who crossed the English Channel in 1959 and became the first Asian woman to do so; in 1960 she also became the first Indian sportswoman to be awarded the Padma Shri. Option A is wrong because Bula Choudhury, also a swimmer from Bengal…

The correct answer is B, Saina Nehwal, who won the bronze in the women's singles at the London Olympics in 2012, the first Olympic medal in badminton for India; in 2015 she also became the first Indian woman to reach the world number one ranking in the sport.