Railway GK Questions 2026

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.

The ozone layer lies in the stratosphere, mostly between about 15 and 35 km above the earth, and it absorbs most of the sun's harmful ultraviolet radiation.

The Moderates, who led the Indian National Congress from 1885 to about 1905, did not seek to overthrow British rule; they believed in its basic fairness and wanted reforms within it.

Both statements about the Preamble are true. Statement 1 is correct because the Preamble resolves to secure to all citizens "EQUALITY of status and of opportunity", alongside justice (social, economic and political), liberty (of thought, expression, belief, faith and worship) and fraternity.

Avani Lekhara is an Indian para-shooter from Jaipur, Rajasthan, who competes in rifle events in the SH1 class. A car accident in 2012 left her with a spinal cord injury, and she took up shooting a few years later.

The Ganga flows from west to east across the northern plains, so the cities follow the order in which the river reaches them.

Isobars are atoms of different elements that have the same mass number but different atomic numbers. The mass number is the total of protons and neutrons in the nucleus, so isobars have the same number of nucleons arranged differently: more protons and fewer neutrons in one, the reverse in another.

Mature human red blood cells and platelets have no nucleus. Red blood cells lose their nucleus as they mature in the bone marrow; this gives their biconcave disc shape more room for haemoglobin to carry oxygen, but it also means they cannot divide or repair themselves and live only about…

The Constitution of India borrowed the rule of law, the law-making procedure and the parliamentary system from the British Constitution, but took the independence of the judiciary from the US Constitution.

The National Disaster Management Authority (NDMA) works under the Ministry of Home Affairs, which is the nodal ministry for disaster management in India.

Granite is an igneous rock, formed when molten magma cools and hardens. Because it cools slowly deep inside the earth's crust, its crystals grow large enough to be seen by the naked eye, so it is called an intrusive or plutonic igneous rock.

Delhi has three UNESCO World Heritage Sites, and they are exactly these three. Humayun's Tomb was inscribed in 1993; built in the 1560s at the wish of his widow Bega Begum, it was the first garden-tomb on the Indian subcontinent and a model for the Taj Mahal.

Handloom cotton weaving was India's largest industry, and it suffered most when British rule opened India to machine-made cloth. Before the 19th century, Indian muslins, calicoes and chintz from Bengal, Gujarat and the Coromandel coast were sold across the world.