RRB Group D GK Questions 2026

The blue revolution is the name given to the rapid rise in fish output through aquaculture and improved marine fishing, which in India followed the spread of induced breeding of carp, the work of fish farmers development agencies and later a dedicated central scheme for fisheries.

A cosmic ray physicist who founded the Physical Research Laboratory at Ahmedabad, he persuaded the government that a poor country needed space technology for communication, weather and education, set up the rocket launching station at Thumba and built the organisation that became the Indian Space Research Organisation.

Raman announced in 1928 that light scattered by a transparent medium contains components of changed wavelength, a shift that reveals the energy levels of the scattering molecules, and the Nobel Prize in Physics followed in 1930, making him the first Asian to receive a Nobel in a science.

His study of the characteristic X-rays of the elements showed that the nuclear charge, the atomic number, is the quantity that rises regularly from element to element, and the modern periodic law therefore states that properties are a periodic function of atomic number.

Ohm found that for a metallic conductor at a steady temperature the ratio of potential difference to current is a constant, the resistance, which is written as V equals I into R, so doubling the voltage doubles the current.

His experiments on garden pea, in which he followed single characters such as seed shape and flower colour through generations, gave the laws of dominance, segregation and independent assortment, and showed that inheritance works through discrete factors rather than a blending of parental traits.

Pressure applied to an enclosed liquid is transmitted equally and undiminished in every direction, so a small force on the narrow master cylinder of a brake creates a much larger force on the wide piston at each wheel, which is also how a hydraulic press and a hydraulic lift work.

Working on the observations of Tycho Brahe he found that a planet moves in an ellipse with the sun at one focus, that the line from the sun to the planet sweeps equal areas in equal times, and that the square of the orbital period is proportional to the cube…

By bombarding beryllium with alpha particles he obtained a penetrating radiation that could not be bent by electric or magnetic fields, and he showed it to consist of neutral particles of about the mass of a proton, for which he received the Nobel Prize in Physics.

Thomson. Working with cathode rays in a discharge tube in 1897, he showed that the rays were a stream of negatively charged particles far lighter than any atom, and he measured their charge to mass ratio, which established the electron as the first known subatomic particle.

In Einstein's special theory of 1905 the energy required to accelerate a body with mass rises without limit as its speed approaches that of light, so such a body can come close to but never reach the speed of light in vacuum, which is the same for every observer.

Toothpaste is mildly basic so that it can neutralise the acid that causes tooth decay. Bacteria in the mouth break down sugar and food particles left on the teeth and produce acids.

Both have 10 electrons, the same number as a neon atom, so they are isoelectronic. Isoelectronic species have the same number of electrons.

At this one temperature the Celsius and Fahrenheit scales show the same number. The two scales are linked by F = (9/5)C + 32.

This follows the reactivity series of metals, in which zinc lies above iron, iron above lead and lead above copper.

This is double fertilisation, a feature found only in flowering plants. The pollen tube carries the two male gametes into the embryo sac.

Litmus is a purple dye extracted from certain lichens, such as species of Roccella, and it turns red in acid and blue in base.

The heat needed to turn unit mass of a liquid into vapour at constant temperature is its specific latent heat of vaporisation.

Temporary hardness comes from dissolved calcium and magnesium hydrogencarbonates (bicarbonates), and it can be removed simply by boiling. On boiling, calcium hydrogencarbonate breaks down into insoluble calcium carbonate, water and carbon dioxide, and the carbonate settles out; this is the scale seen inside kettles.

The stinging hairs on nettle leaves break on touch and inject methanoic acid, also called formic acid, into the skin, which causes the burning pain.