RRB JE GK Questions 2026

Polythene is a synthetic plastic that bacteria and fungi cannot break down, so it is non-biodegradable. A plastic bag can stay in soil or water for hundreds of years.

Rain with a pH below 5.6 is called acid rain. Even clean rain is slightly acidic, with a pH of about 5.6, because carbon dioxide from the air dissolves in it to form weak carbonic acid; that is why 5.6, not 7, is the dividing line.

The ozone layer shields us from the Sun's harmful ultraviolet rays, so when it thins, that protection is lost. It lies in the stratosphere, roughly 15 to 35 km above the Earth, and absorbs most of the UV-B and UV-C radiation.

A forest forms and runs on its own, without any human effort, so it is a natural ecosystem.

The 2's complement of a binary number is found in two steps: flip every bit to get the 1's complement, then add 1.

A firewall stands between a trusted private network and an untrusted one such as the internet, and checks the data going in and out.

Static RAM stores each bit in a flip-flop circuit made of several transistors, usually six, so the bit stays put as long as the power is on and never needs refreshing.

A hard disk is a secondary storage device that keeps programs and files permanently, even when the power is off, and it sits outside the processor.

In Microsoft PowerPoint, pressing F5 starts the slide show from the first slide, whichever slide you are working on at that moment.

Washing soda is sodium carbonate decahydrate: each unit of sodium carbonate holds ten molecules of water of crystallisation. It is made from common salt in steps: baking soda is heated to get anhydrous sodium carbonate, called soda ash, which is then recrystallised from water to give washing soda crystals.

Red has the longest wavelength in visible light, about 700 nm, so the tiny particles of air, fog, smoke and dust scatter it the least.

The reactivity series lists metals from the most reactive to the least reactive, and potassium heads it because it loses its single outer electron most easily.

It gives the direction of the force, and so of the motion, on a current-carrying conductor placed in a magnetic field, which is exactly what turns the coil of a motor.

Combustion means burning in oxygen, and complete burning of methane gives carbon dioxide, water, heat and light. The equation is balanced: one carbon, four hydrogen and four oxygen atoms on each side.

The N shell is the fourth shell (n = 4), and the most electrons a shell can hold is given by the formula 2n², so 2 × 4² = 32.

In diamond every carbon atom is joined to four other carbon atoms by strong covalent bonds. These bonds point towards the corners of a tetrahedron and build a rigid three-dimensional network that runs through the whole crystal.

It is the standard set of rules used for reflection by spherical mirrors and for the mirror formula. Under this convention the pole of the mirror is the origin and the principal axis is the x-axis.

The release describes the train protection system as heavily dependent on technology and therefore obliged to carry safety certification of the highest order, which it identifies as SIL-4.

That is the length of the Malkajgiri-Kamareddi section in the Hyderabad Division on which the system was carried up from the older edition to the newer one.

The Ministry of Railways said that Version 4.0 of the train protection system was put into service for the first time on this zone, on the Malkajgiri-Kamareddi section of the Hyderabad Division.