RRB Group D GK Questions 2026

Outside a long straight wire the field is B = μ₀I/(2πr), so at a fixed distance r it is directly proportional to the current I. Hans Christian Oersted found in 1820 that a current deflects a compass needle, showing that a current produces a magnetic field.

Magnesium does not react with cold water; it reacts with hot water and burns in steam to form magnesium oxide and hydrogen.

With constant acceleration the distance covered is s = ut + ½at², and the first term contains the initial velocity u. This is the second equation of motion.

This is absolute zero, more exactly −273.15°C or 0 kelvin, the temperature below which nothing can be cooled. Temperature measures the random motion of particles.

One hertz means one complete cycle per second, so a frequency of 3 Hz means the current completes three full cycles every second.

Pitch is how the ear perceives the frequency of a sound, so a higher pitch means more vibrations per second.

Streptococcus mutans turns dietary sugar, especially sucrose, into a sticky slime that glues it to the teeth. The bacterium makes enzymes called glucosyltransferases that join the glucose units of sucrose into sticky chains called glucans.

These three oxides, made by heating limestone with clay, form the compounds that make cement set and harden. Portland cement was patented by Joseph Aspdin in England in 1824, and named after Portland stone, which the set cement resembled.

The weight we feel is really the push of the floor on us, and in orbit that push disappears. The space station and the astronaut are both in free fall around the Earth.

A thermocouple has no liquid that can freeze, so suitable types can read temperatures far below −200°C. A thermocouple is made of two wires of different metals joined at a junction.

The Rihand dam was built on the Rihand, a tributary of the Son, in Sonbhadra district, and its reservoir is the largest artificial lake of India.

Aligarh has made locks since the colonial period and the trade grew into a cluster of small workshops making locks, hinges, builders hardware and brass fittings, which is also the One District One Product of the district.

The town and the villages around it, together with neighbouring Mirzapur, form the largest hand knotted carpet belt of India and export most of what they weave.

The Mathura refinery of the Indian Oil Corporation is the only refinery in the state and was set up to serve the demand of the north western plains, with crude reaching it by pipeline.

The town has distilled flower oils in copper stills for centuries and is called the perfume capital of India, its ittar being carried in leather bottles and matured through the seasons.

The scheme was announced on Uttar Pradesh Day, 24 January 2018, and chose one traditional product for each district so that help with design, credit, common facility centres, packaging and marketing could be concentrated instead of scattered.

The city grew in the nineteenth century as the cotton and woollen mill town of the Ganga plain, with army supply orders behind it, and the tanneries of Jajmau grew beside the mills.

The Singrauli coalfield spreads across the border of Madhya Pradesh into Sonbhadra, and no other district of Uttar Pradesh has workable coal.

Firozabad has made glass bangles, chandeliers and glassware for generations and is called the bangle city of India.

Chikankari is the fine white shadow work embroidery of Lucknow, done with untwisted thread on muslin, cotton and georgette, and it carries a geographical indication tag in the name of the city.