RRB Group D GK Questions 2026

The Sun is about 149.6 million kilometres from the Earth, a distance called one astronomical unit, and light travels about three lakh kilometres in a second.

Venus is wrapped in a very thick atmosphere of carbon dioxide, which lets sunlight in but does not let the heat escape.

DDT and mercury compounds are not broken down in the body and are not excreted, so they build up in the tissues of every organism that takes them in and are passed on to whatever eats it.

Gross primary productivity is the total amount of energy that producers fix by photosynthesis. Plants use a part of it for their own respiration, and what remains stored in plant bodies is the net primary productivity.

In a pond the producers are phytoplankton, tiny floating plants whose total weight at any one moment is small. They multiply very rapidly, however, so over time they can feed a far greater mass of zooplankton and fish.

Bears, crows, pigs and human beings eat both plant and animal food, which allows them to occupy more than one trophic level at the same time and makes them a good example of why food webs, rather than single food chains, describe nature better.

Detritus is dead organic matter such as fallen leaves, dead bodies and animal waste. Organisms like earthworms, termites, bacteria and fungi feed on it, and they in turn are eaten by small birds and other animals.

Energy enters an ecosystem as sunlight, is fixed by green plants, and then moves from producers to herbivores, to carnivores and finally to decomposers.

They feed on dead bodies, fallen leaves and waste matter, break the complex organic substances into simple ones and release nutrients back into the soil, water and air, where plants can take them up again.

Energy is lost as heat at every transfer from one trophic level to the next, so a higher level can never hold more energy than the level below it.

It says that only about ten per cent of the energy present at one trophic level is passed on to the next, since the rest is used in respiration and other life processes and is lost to the surroundings as heat.

Green plants make their own food from carbon dioxide and water by photosynthesis, using the energy of sunlight, so they are also called autotrophs.

The British botanist Arthur George Tansley used the word ecosystem in 1935 for a unit in which living organisms and their non-living surroundings are treated together as one system exchanging energy and matter.

The Dhyan Chand Award for Lifetime Achievement in Sports and Games was instituted in 2002 to honour sportspersons who not only performed well in their playing days but kept serving the sport after retiring.

The Sangeet Natak Akademi, India's national academy of music, dance and drama, was created by a government resolution of 31 May 1952 and formally inaugurated on 28 January 1953 by President Rajendra Prasad.

'Ace Against Odds' is the autobiography of Sania Mirza, India's most successful woman tennis player, published in 2016 and written with her father Imran Mirza and Shivani Gupta.

Kathakali, which means 'story play', is the classical dance-drama of Kerala, performed traditionally by men, in which stories from the Ramayana and Mahabharata are told through hand gestures (mudras), eye movements and facial expressions.

Gir in Gujarat is a national park and wildlife sanctuary, famous as the only home of the Asiatic lion, but it has never been declared a biosphere reserve.

International Tiger Day, also called Global Tiger Day, is observed every year on 29 July. It was started in 2010 at the Tiger Summit held in St Petersburg, Russia, where the thirteen tiger-range countries promised to double the number of wild tigers by 2022.

Sucheta Kripalani became Chief Minister of Uttar Pradesh in October 1963 and served till March 1967, making her the first woman to head a state government in India.