Railway GK Questions 2026

By Coulomb's law the force F = kq₁q₂/r² comes out positive, meaning repulsive, whenever the two charges have the same sign.

To see one's full image in a plane mirror, the mirror must be at least half the person's height: half of 1·5 m is 0·75 m. Light from Sita's feet must reflect from the mirror into her eyes, and so must light from the top of her head.

Physics recognises four fundamental forces: gravitational, electromagnetic, strong nuclear and weak nuclear, and the question lists all four. Every other force we meet is a form of these.

Adenosine triphosphate is the energy currency of the cell: breaking its last phosphate bond releases energy for cell work. ATP is made mainly in the mitochondria during cellular respiration, and in the chloroplasts of green plants during photosynthesis.

Force depends on how fast momentum changes, not on the momentum itself. Newton's second law states that the rate of change of momentum of a body is proportional to the net force on it and takes place in the direction of the force.

If pressure is proportional to temperature for a fixed amount of ideal gas, the volume must stay constant, so the process is isochoric.

Mass is the same everywhere, but weight changes with g, so only statement II holds. Inertial mass measures how much a body resists a change in motion (F = ma); gravitational mass measures how strongly gravity pulls it.

A mirage forms when light from the sky bends through hot, less dense air near the ground and is finally totally internally reflected.

Constant velocity means both the speed and the direction stay the same, so the speed cannot change. Velocity is a vector: it has a magnitude, the speed, and a direction.

The pericycle is a layer of cells around the vascular cylinder of the root and stem; it is not part of xylem or phloem.

Radiant heat is infrared electromagnetic radiation, so it travels in straight lines at the speed of light. Heat moves in three ways.

Marie Curie discovered radium; the first two pairs have their discoveries swapped. Marie Curie and Pierre Curie discovered the radioactive elements polonium and radium in 1898, and Marie Curie went on to win Nobel Prizes in both physics (1903) and chemistry (1911).

Both changes let more molecules escape from the surface each second. Evaporation is a surface process: only molecules at the surface with enough energy break away into the air.

Nichrome has a high resistivity and does not oxidise easily when red hot, so it is the standard heating element.

Charge equals current multiplied by time, and here that is 15 A × 600 s = 9000 C. Electric current is the rate of flow of charge, I = Q/t, so Q = I × t. The SI unit of charge, the coulomb, is the charge carried by one ampere…

Ligaments are bands of dense connective tissue that join one bone to another at a joint. Ligaments are rich in tough, slightly elastic fibres, so they hold the bones of a joint together while still allowing movement.

One parsec equals about 2,06,265 astronomical units, which rounds to 2 × 10⁵ A.U.

At the top of its flight all the kinetic energy of the ball has turned into gravitational potential energy. The mass is 350 g, that is 0·35 kg.

The assembly in Pune runs for five days, from 12 to 16 October 2026, and brings together more than 550 participants from Europe, the Americas, South Asia, South East Asia and Australia, of whom 380 are attending in person and about 180 online.

Atmospheric Processes and their Role in Climate is one of its core projects and works on the atmospheric drivers and processes that govern weather patterns and the dynamics of the global climate.