RRB Group D GK Questions 2026

The prefix di stands for two and the ending ene for a carbon to carbon double bond, so a diene is a hydrocarbon carrying exactly two such bonds; buta-1,3-diene, the raw material of synthetic rubber, is the standard example.

Hexane, C6H14, can be drawn as a straight chain of six carbons, as two chains of five carbons with a methyl branch in different positions, and as two chains of four carbons carrying branches, which gives five different structures with the same molecular formula.

Liquefied petroleum gas is a mixture of these two saturated hydrocarbons, which are gases at ordinary pressure but turn liquid under moderate pressure, so a large quantity of fuel fits into a small cylinder; a strong-smelling compound is added so that a leak is noticed.

It grew out of a department for non-conventional energy sources created in 1982, became a full ministry in 1992 and took its present name in 2006, and India is among the very few countries in the world to have a separate ministry devoted to this sector.

Projects of this size and below fall under the small hydro programme of the Ministry of New and Renewable Energy, while larger schemes are handled as conventional hydro power by the Ministry of Power.

The plan set out eight missions covering solar energy, enhanced energy efficiency, sustainable habitat, water, the Himalayan ecosystem, a green India, sustainable agriculture and strategic knowledge for climate change, and every later programme in this field refers back to it.

Both are long, narrowing inlets on the coast of Gujarat, and such a shape funnels the incoming tide so that the difference between high and low water is large, which is exactly what a tidal power scheme needs; the Sundarbans coast is the other site usually named.

The Puga valley in eastern Ladakh carries hot springs and sulphur deposits and is the best studied geothermal field in the country, the heat coming from the young mountain building of the Himalaya.

Muppandal lies in the far south of the state near Kanyakumari, where the wind pushed through a break in the Western Ghats blows strongly and steadily for much of the year, and Tamil Nadu has long been among the leading wind states of the country.

Natural gas is a fossil fuel formed over millions of years from buried organic matter; the stock is fixed, so every unit burnt is gone, and it releases carbon dioxide when burnt, although less than coal for the same heat.

The mission was launched in January 2010 as one of the eight national missions under the National Action Plan on Climate Change, and its aim was to make solar power competitive by building capacity in stages and by supporting domestic manufacturing.

The alliance has its secretariat on the campus of the National Institute of Solar Energy at Gwal Pahari in Gurugram, and because it rests on a framework agreement among its members it is the first treaty-based international organisation to be headquartered in India.

A geothermal plant takes steam or hot water from a natural underground reservoir, whose temperature is set by the rock and rarely approaches what a furnace can produce, so both the temperature and the pressure at the turbine are well below those of a coal-fired steam plant, and the thermal…

Anthracite is the oldest and hardest grade of coal, with the highest proportion of carbon, so it gives the most heat for its weight and burns with a clean, almost smokeless flame.

Sambhar lies west of Jaipur in a shallow depression with no outlet to the sea; water that flows in can only evaporate, leaving behind the salt that has made the lake a major source of common salt for centuries.

Bhakra is built across the Sutlej at the Bhakra gorge on the border of Himachal Pradesh and Punjab, is the highest straight gravity dam in India, and the lake it holds is named Gobind Sagar after Guru Gobind Singh.

Loktak in Manipur is covered with phumdis, floating mats of soil and decaying vegetation thick enough to walk on, and the southern part of the lake was declared Keibul Lamjao National Park, the only floating national park in the world and the last natural home of the sangai or brow-antlered…

The Tehri dam stands in the Tehri Garhwal district of Uttarakhand, just below the point where the Bhilangana joins the Bhagirathi, and it is the tallest dam in India; it supplies power, drinking water and irrigation, and its construction submerged the old town of Tehri.

Chilika lies along the coast of Odisha, separated from the Bay of Bengal by a long sand bar, and its mixture of fresh and sea water supports one of the largest wintering grounds for migratory birds in the subcontinent as well as a population of Irrawaddy dolphins.

It lies in the Kashmir valley, is fed by the Jhelum, and is the largest freshwater lake in India; it acts as a natural flood absorber for the valley and is a designated wetland of international importance.