RRB Group D GK Questions 2026

The correct answer is B, bunchy top of banana, a virus disease in which the plant is severely stunted and its leaves become short, narrow and crowded in a bunch at the top; it is carried by an aphid and by infected suckers used for planting, so control depends on…

Where this micronutrient is short, the leaf blade of cauliflower fails to expand and the leaf is reduced to a narrow, whip-like strip along the midrib, which gives the disease its name; the curd is small or does not form at all.

In khaira disease the leaves of young rice plants develop rusty brown spots that spread until the crop looks scorched, tillering is poor and growth is stunted; an application of zinc sulphate to the soil or as a foliar spray corrects it, which confirms that the cause is a deficiency…

Citrus canker is caused by a species of Xanthomonas, which enters through wounds, insect punctures and stomata and raises raised corky brown lesions, often with a yellow halo, on leaves, twigs and fruit; it spreads in splashing rain, on tools and on infected nursery plants.

The correct answer is A, Colletotrichum falcatum, a fungus that rots the internal tissue of the cane, turning it red with white patches and giving it a sour smell, and which spreads mainly through infected setts used for planting.

The rusts of wheat, named black, brown and yellow after the colour of the pustules they raise on the stem and leaves, are caused by species of Puccinia, and resistance to them was one of the traits selected in the dwarf wheats of the Green Revolution.

The epidemic of the 1840s destroyed the potato crop of Ireland and brought on the famine, and the study of that outbreak by Anton de Bary established plant pathology as a science.

The fourth Sikh Guru, Guru Ram Das, founded the settlement of Ramdaspur around the sacred tank in the late sixteenth century, and the town came to be called Amritsar after the pool of nectar, the Amrit Sarovar.

After defeating Humayun at Chausa and Kannauj, Sher Shah Suri refounded Patna in 1541 as a fortified administrative and commercial town on the ruins of ancient Pataliputra, recognising the strategic value of the site on the Ganga.

Harshavardhana of the Pushyabhuti or Vardhana dynasty began his reign at Thanesar in Haryana and, after the death of his brother-in-law Grahavarman of the Maukhari house, united the two kingdoms and made Kannauj on the Ganga his capital around the early seventh century.

The two brothers of the Sangama family founded the city of Vijayanagara on the Tungabhadra in 1336 and with it the Vijayanagara empire, which lasted until the defeat at Talikota in 1565; the ruins at Hampi in Karnataka are a World Heritage Site.

Firoz Shah Tughlaq was the greatest city builder of the Sultanate. He founded Firozabad on the Yamuna in Delhi, where the Firoz Shah Kotla stands, and outside Delhi he laid out Hisar, known as Hissar-Firoza, along with Fatehabad, Firozpur and Jaunpur, the last named in memory of Muhammad bin Tughlaq…

The Gujarat sultan Ahmad Shah I founded Ahmedabad in 1411 near the older settlement of Asaval and Karnavati, and the city became the capital of the Gujarat Sultanate and a great centre of textile trade; the Bhadra fort and the Jama Masjid date from this period.

Akbar began building Fatehpur Sikri near Agra from 1571, naming it after his victory in Gujarat, and it served as his capital for roughly fourteen years before the court returned to Agra and later moved to Lahore.

Devagiri in the Deccan, the old Yadava capital, was renamed Daulatabad by Muhammad bin Tughlaq, who ordered the transfer of the court and the population of Delhi there in 1327 so that he could control both north and south from the centre of his empire.

The fifth ruler of the Qutb Shahi dynasty founded Hyderabad in 1591 on the banks of the Musi, a short distance from the crowded hill fort of Golconda, and the Charminar was raised in his reign at the centre of the new city.

The Kachhwaha ruler Sawai Jai Singh II moved his capital down from the hill fort of Amer and founded Jaipur in 1727, laying it out on a grid of nine rectangular blocks with the help of the scholar and planner Vidyadhar Bhattacharya, which makes it the first planned city of…

Udayin, also called Udayabhadra, was the son of Ajatashatru and the ruler of the Haryanka dynasty who built a fort at the meeting point of the Ganga and the Son and shifted the Magadhan capital there from Rajagriha.

Karewas are thick beds of fine clay, silt and sand laid down on the floor of a Pleistocene lake that once filled the Kashmir Valley; they form flat terraces above the Jhelum's floodplain, and the karewas around Pampore in Pulwama district produce the saffron for which the valley is famous…

The Damodar Valley Corporation was set up by an Act of Parliament in 1948, the first multipurpose river valley project of independent India, and it was consciously modelled on the Tennessee Valley Authority of the United States, which had combined flood control, irrigation, navigation and power generation in one basin…