RRB Group D GK Questions 2026

The English physicist James Prescott Joule showed around 1841 that when a current flows through a conductor, the heat produced is proportional to the square of the current, the resistance of the conductor and the time for which the current flows.

India's first underwater metro tunnel runs beneath the Hooghly river in Kolkata. It is part of the East-West Metro corridor (the Green Line) of Kolkata Metro and joins Howrah on the west bank with Kolkata on the east bank.

As blood flows through the thin-walled capillaries, part of its plasma, with small proteins and some white blood cells, leaks out into the spaces between cells.

Algae are the predominantly aquatic members of the Kingdom Plantae. They are simple, chlorophyll-bearing organisms with a thallus body that is not divided into true roots, stems and leaves.

The human body conducts electricity because its fluids contain dissolved salts that break up into ions, and these ions carry current.

The Kolkata Metro is run by Indian Railways as its own zone, the Metro Railway, with its headquarters in Kolkata.

Neutrons sit inside the nucleus with protons; it is the electrons that move around the nucleus. The neutron was discovered by James Chadwick in 1932, and he received the Nobel Prize in Physics for it in 1935.

Resistivity is a property of the material and its temperature, not of the wire's shape, so every copper wire has the same resistivity.

Gravitational force varies inversely with the square of the distance, so doubling the distance cuts the force to one-fourth.

Iodine is a non-metal, yet its solid crystals have a shiny, metallic lustre, which makes it the standard exception taught in school chemistry.

The Railway Board has decided that Station Master recruitment will no longer ride along with other graduate-level posts in a combined notice, so candidates now get a dedicated document setting out the eligibility conditions, the examination procedure and the board-wise distribution of vacancies for this post alone.

The correct answer is Mumbai, whose Railway Recruitment Board carries 177 of the posts, the largest share of any board in this round.

That is the board-wise total of Station Master vacancies notified under Centralised Employment Notice No. 08/2026, spread over the various Railway Recruitment Boards and zones of Indian Railways.

This statement is false, because sound in air travels as longitudinal waves, not transverse waves. In a longitudinal wave, the particles of the medium vibrate back and forth along the direction in which the wave moves, forming compressions and rarefactions.

Power is the reciprocal of the focal length in metres, so P = 1 ÷ 0.25 m = +4 D. The power of a lens tells how strongly it converges or diverges light.

A solar cell turns the energy of sunlight directly into electricity through the photovoltaic effect. A solar cell is a large p-n junction, usually made of silicon.

With the same voltage, heat varies inversely as resistance, and the parallel resistance is one-fourth of the series resistance. The two wires are identical, so each has the same resistance R. In series the total resistance is R + R = 2R; in parallel it is R/2.

Tidal volume is the volume of air breathed in or out in one normal, quiet breath, about 500 mL in a healthy adult.

The cornea is a clear layer made of cells and proteins, chiefly collagen fibres laid out in a regular pattern that keeps it transparent.

The time period of a simple pendulum depends on its length but not on the mass of the bob, so halving the length divides the period by √2.