RRB Group D GK Questions 2026

The Delhi Sultanate began in 1206, when Qutb-ud-din Aibak became the first sultan after the death of Muhammad Ghori, and ended in 1526, when Babur defeated Ibrahim Lodi at the First Battle of Panipat.

Hamida Banu Begum was the wife of Humayun and the mother of Akbar, who was born to her in 1542 at Amarkot in Sindh.

Akbar won over the Rajput rulers through marriage alliances and high ranks, turning old rivals into pillars of the Mughal empire.

Part IV, Articles 36 to 51, lists the Directive Principles that guide the State in making laws for a welfare state.

The Fourth Schedule allots the seats of the Rajya Sabha, the Council of States, among the States and Union Territories.

Article 343(1) declares that the official language of the Union shall be Hindi in the Devanagari script, with the international form of Indian numerals for official purposes.

Article 21-A was inserted by the Constitution (86th Amendment) Act, 2002, making free and compulsory education for children aged six to fourteen a Fundamental Right.

Article 154 says the executive power of a State is vested in the Governor, who exercises it directly or through officers under him, exactly as Article 53 does for the President at the Centre.

Magnification is a ratio of two lengths, so the units cancel and it is a pure number. For a mirror or a lens, magnification m equals the height of the image divided by the height of the object (h′/h).

A ray that passes through the optical centre of a thin lens comes out in the same direction, without any bending.

Red cabbage is a natural acid-base indicator, methyl orange is a synthetic acid-base indicator, and onion and clove are olfactory indicators.

The d-block occupies the middle of the modern periodic table, groups 3 to 12, and its members are also called transition elements.

A red blood cell is a biconcave disc, thin in the middle and thick at the edge, not an amoeboid cell.

Mercury (Hg) belongs to group 12, not group 11. Group 11 of the modern periodic table holds copper (Cu, atomic number 29), silver (Ag, 47) and gold (Au, 79).

Platelets are the tiny cell fragments that rush to a cut and start the clot. They are also called thrombocytes and are made in the bone marrow from large cells called megakaryocytes.

The Sudirman Cup is the world mixed team championship of badminton, organised by the Badminton World Federation (BWF). It was first held in 1989 in Jakarta and is named after Dick Sudirman, the founder of the Badminton Association of Indonesia.

Sattriya was developed in the sattras, the Vaishnavite monasteries of Assam, by the saint-reformer Srimanta Sankardev in the 15th century.

The dance takes its name from its birthplace, the village of Kuchipudi, earlier called Kuchelapuram, in the Krishna district of Andhra Pradesh.

The Indian Olympic Association (IOA) was formed in 1927 and was recognised by the International Olympic Committee the same year.

The Sports Authority of India (SAI) was set up by the Government of India in January 1984 as a registered society under the Ministry of Youth Affairs and Sports.