RRB Group D GK Questions 2026

Heat makes the copper wire expand a little, and a longer pendulum swings a little more slowly. The time period of a simple pendulum is T = 2π√(L/g), so it grows with the square root of the length.

This is the law of conservation of energy: energy only changes from one form to another. In any isolated system the total energy stays the same.

This reverses the truth: a voltmeter has a very high resistance and an ammeter a very low one. An ammeter measures the current flowing through a circuit, so it is placed in series and the whole current passes through it.

The campaign was implemented from 2 October 2026 and closes on 31 October 2026, and the Railways reported crossing several of its targets as that closing date drew near.

As Chairman and Chief Executive Officer of the Railway Board he took part in Rail Jan Samvaad at New Delhi on 22 October 2026 and met stakeholders there, while the Secretary of the Department of Administrative Reforms and Public Grievances attended the same programme at Chhatrapati Shivaji Maharaj Terminus in…

Those three were the stated subjects on which Indian Railways sought feedback and suggestions from passengers at 5,884 stations on 22 October 2026.

Indian Railways held Rail Jan Samvaad on 22 October 2026 at that many stations across the country, so that staff could speak to passengers at the station itself and take their feedback and suggestions on cleanliness, passenger amenities and service delivery.

Movement of ions through protein channels is facilitated diffusion, a passive process that needs no energy from ATP. Active transport moves substances against their concentration gradient, from low to high concentration, using carrier proteins and energy, usually from ATP.

An emulsion is a colloid in which tiny droplets of one liquid are spread through another liquid with which it does not mix.

Both particles gain the same kinetic energy, but the electron is far lighter, so it ends up much faster. When a charge q is accelerated through a potential difference V, it gains kinetic energy equal to qV.

The object lies between F and 2F of the convex lens (25 cm and 50 cm), and such an object always gives a real, inverted and enlarged image beyond 2F. Using the lens formula 1/v − 1/u = 1/f with u = −40 cm and f = +25 cm gives…

Nanotechnology deals with matter at the scale of roughly 1 to 100 nanometres, where materials begin to show new properties.

Ribosomes are the only one of these found in prokaryotic cells such as bacteria, because they are not enclosed by a membrane.

Neither statement is correct: only starch is a mixture of amylose and amylopectin, and only glycogen is stored in liver cells.

Ultraviolet rays have the shortest wavelength of the three, visible light comes next and infrared rays have the longest. The electromagnetic spectrum, in order of increasing wavelength, runs from gamma rays and X-rays to ultraviolet, visible light, infrared, microwaves and radio waves.

The power of a lens measures how strongly it bends light, and +2.5 D has the largest magnitude among the four options.

Each of them is made of two simple sugar units joined together, which is exactly what a disaccharide is. Carbohydrates are grouped by the number of sugar units they contain.

Work is negative when the force acts opposite to the displacement, because the angle between them is then 180°. Work done is W = F S cos θ, where θ is the angle between the force and the displacement.

Once a satellite is placed in orbit with the right speed, the Earth's gravity keeps it going round without any engine.

Friction is a non-conservative force because the work it does depends on the path taken and the energy it removes is lost as heat.