RRB JE GK Questions 2026

These gases come from burning coal and oil in thermal power stations, smelters and vehicles, are oxidised in the atmosphere and dissolve in water droplets to form sulphuric acid and nitric acid, which come down as acid rain.

The Montreal Protocol was adopted in 1987 under the Vienna Convention of 1985 and sets the timetable by which countries must stop producing and using chlorofluorocarbons, halons, carbon tetrachloride, methyl chloroform and methyl bromide.

The Dobson unit, named after the scientist who built the instrument for measuring atmospheric ozone, expresses how thick the ozone column would be if all of it were brought down to the surface at standard temperature and pressure; a hundred Dobson units correspond to a layer one millimetre thick.

About nine tenths of the atmosphere's ozone lies in the stratosphere, roughly fifteen to thirty five kilometres above the surface, where ultraviolet rays split oxygen molecules and the free atoms combine with other oxygen molecules to make ozone.

Nitric oxide and nitrogen dioxide, together written as nitrogen oxides, are air pollutants that come mainly from combustion in vehicles and power stations; they help form smog and acid rain but are not counted among the greenhouse gases of the natural atmosphere.

A primary pollutant is released directly from a source, while a secondary pollutant is formed in the atmosphere when primary pollutants react.

Each of the other three statements is correct on its own, which is exactly why the combined option is the answer.

BALCO, the Bharat Aluminium Company, has its smelter at Korba in Chhattisgarh, where cheap thermal power and nearby bauxite made aluminium smelting possible.

That body regulates the securities market and has nothing to do with industrial safety in steel plants, so it does not figure in the composition of the new Council.

It is being established alongside the Council to supply technical and professional expertise in areas such as process safety, blast furnaces, steel melting, rolling mills, coke ovens, refractory systems, electrical and mechanical safety, occupational health, fire engineering and disaster management.

The Council has been placed under the administrative control of the Ministry of Steel and its Secretary has been made its Chairman, with senior officers of the Ministry and the chief executives of integrated steel producers sitting as members.

Lignite is the low grade brown coal the question describes: it is soft, brown to blackish brown, and holds a high amount of moisture, often 35 to 45 per cent, so it gives less heat when it burns.

The Salem Steel Plant lies in Salem district of Tamil Nadu, so this is the only correctly matched pair. It is a SAIL unit set up in 1981 and is known for stainless steel cold-rolled coils and sheets rather than ordinary construction steel.

Johann Wolfgang Dobereiner, a German chemist, grouped elements of similar properties in sets of three that he called triads. His rule was that the atomic mass of the middle element is about the average of the other two.

Water behaves unlike most liquids between 0 and 4 degrees Celsius, a behaviour called the anomalous expansion of water. Almost every substance shrinks as it is cooled, but water shrinks only until it reaches 4 degrees Celsius.

A binary number is written with only the digits 0 and 1, and each place stands for a power of two.

These are the weak attractions that appear when the electron cloud of an atom becomes momentarily lopsided, creating a temporary dipole which then induces a matching dipole in a neighbouring atom.

The program was created by Forethought Inc., where Robert Gaskins and Dennis Austin designed it, and the first version ran on the Apple Macintosh in 1987.

The Print pane of PowerPoint offers handout layouts of 1, 2, 3, 4, 6 and 9 slides per page, so nine is the largest number, and the 3-slide layout is the one that leaves ruled lines beside the slides for the audience to write on.

A template stores the theme, masters, layouts and sample content that new presentations are started from, and its extension in the current format is.potx; the older format used.pot.