RRB Group D GK Questions 2026

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.

The kinetic theory of an ideal gas assumes exactly the opposite: that there are no forces of attraction or repulsion between molecules except during the brief moment of a collision.

Temperature is a measure of the average kinetic energy of the particles of a substance, in a solid as in a gas: in a solid the particles are held in fixed positions but vibrate about them, and heating makes the vibrations faster and wider, so the average kinetic energy rises…

The kinetic theory gives the average kinetic energy of a molecule as three halves of the product of the Boltzmann constant and the absolute temperature, and for one mole as three halves of RT.

Graham's law of diffusion states that at the same temperature and pressure the rate at which a gas diffuses is inversely proportional to the square root of its density, and therefore of its molar mass.

Substituting one mole, 273.15 kelvin and one atmosphere in the ideal gas equation gives a volume of 22.4 litres, the molar volume at standard temperature and pressure, and this is the figure used in mole calculations; with the modern standard pressure of one bar the value works out to about…

In SI units the universal gas constant is 8.314 joule per mole per kelvin, obtained by multiplying the Boltzmann constant by the Avogadro number.

Extending the straight line of Charles's law backwards shows that the volume of an ideal gas would become zero at minus 273.15 degrees Celsius, and this point is taken as the zero of the kelvin or absolute scale, at which molecular motion carries its least possible energy.

By Charles's law the volume of a fixed mass of gas at constant pressure is proportional to its absolute temperature, so heating the air inside the envelope makes it expand; some of it escapes from the open mouth, the mass of air left inside falls, its density becomes lower than…

Boyle's law, established in 1662, says that for a fixed mass of gas at constant temperature the product of pressure and volume stays constant, so doubling the pressure halves the volume.