NDA 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.

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…

The Ziro Valley in the Lower Subansiri district of Arunachal Pradesh is the home of the Apatani, who grow rice and rear fish in the same flooded field without using draught animals, a system studied as a model of sustainable wet-land farming; the valley is on India's tentative list for…

Yumthang lies beyond the village of Lachung in north Sikkim, at roughly 3,500 metres, and the Shingba Rhododendron Sanctuary around it gives the valley the popular name of the Valley of Flowers of Sikkim; hot springs rise on the bank of the Lachung river and the Zero Point lies further…

A rift valley is a strip of land that has subsided between two roughly parallel faults, and both the Narmada, between the Vindhya and the Satpura, and the Tapi, between the Satpura and the Ajanta hills, occupy such troughs.

Duns, called duars in the eastern Himalaya, are flat-floored longitudinal valleys formed where coarse sediment carried down by Himalayan rivers was trapped between the Lesser Himalaya and the rising Shivalik range.

The Silent Valley National Park in the Palakkad district of Kerala, part of the Nilgiri Biosphere Reserve, is drained by the Kunthipuzha, a tributary of the Bharathappuzha, and the park protects one of the last undisturbed blocks of tropical evergreen forest in the Western Ghats, with the lion-tailed macaque as…

The Valley of Flowers National Park lies in the Chamoli district of Uttarakhand, in the Bhyundar valley drained by the Pushpawati, and it is inscribed on the World Heritage list together with the Nanda Devi National Park.

The Kullu Valley in Himachal Pradesh, along the Beas between Manali and Bhuntar, is called the Valley of the Gods because of the many village deities carried in procession at the Kullu Dussehra, which begins on the day the festival ends elsewhere in India.

The Nubra Valley lies north of Leh, reached across the Khardung La, where the Nubra river joins the Shyok, itself a tributary of the Indus; the sand dunes at Hunder carry the double-humped Bactrian camels left behind by the old Central Asian caravan trade, and the Diskit monastery stands above…

The Kashmir Valley is a broad structural basin about 135 kilometres long lying between the Pir Panjal in the south-west and the Great Himalaya, with its Zanskar branch, in the north-east; the Jhelum meanders across its flat floor and leaves it through a gorge at Baramulla into the Wular lake.

The law states that for a mixture of gases that do not react, the total pressure is the sum of the partial pressures each gas would exert if it alone occupied the whole volume at the same temperature.

The root mean square speed follows from the kinetic gas equation and equals the square root of three RT divided by the molar mass, or equally the square root of three times the Boltzmann constant times the temperature divided by the mass of one molecule.