Static GK in railway exams starts with one shared block: Class 10 science. Every RRB exam on GK24 tests it. Group D has 25 questions on Physics, Chemistry and Life Sciences of 10th CBSE level. JE has 30 in CBT-1 and another 15 on Physics and Chemistry in CBT-2. ALP tests General Science in CBT-1 and Basic Science and Engineering in CBT-2, and NTPC lists general science up to 10th inside General Awareness. Beyond science, the lists differ. NTPC names history and the freedom struggle, geography, polity, the economy, art and culture, environment, computers, abbreviations, transport systems in India, world organisations and government bodies. JE names geography, history and culture, polity, the economy and environmental issues, and adds computers and pollution control in CBT-2. This page holds GK24's topic-wise GK notes for railway exams in English and Hindi: General Science, History, Geography, Polity, Economy, Art and Culture, Environment, Computers and static GK, including Indian Railways. Each note is short facts and tables that can be revised in one sitting. Begin with the science notes, since they serve every railway exam, then add the static topics your exam lists, and test each note with its quiz.
Which pair of logic gates is called universal gates?
They are called universal gates because either one of them, used repeatedly, can build every other logic gate, including NOT, AND, OR, XOR and XNOR.
Read the full explanation →In a bipolar junction transistor, which region is the thinnest and the most lightly doped?
The base of a transistor is made very thin and only lightly doped so that most of the carriers injected by the emitter pass straight through it to the collector instead of recombining in it.
Read the full explanation →Which diode is operated in the reverse breakdown region and is used as a voltage regulator?
A Zener diode is heavily doped so that breakdown occurs at a low and sharply defined reverse voltage. Beyond that point the voltage across it stays almost constant even when the current through it changes a great deal, which is precisely the property a voltage regulator needs.
Read the full explanation →A p-n junction diode is chiefly used in an electronic circuit as a:
A p-n junction conducts freely in forward bias, where the potential barrier is reduced, and blocks current in reverse bias, where only a tiny leakage current flows.
Read the full explanation →The forbidden energy gap of silicon at room temperature is approximately:
Silicon is the most widely used semiconductor and its forbidden energy gap, the separation between the top of the valence band and the bottom of the conduction band, is about 1.1 electron volts at room temperature.
Read the full explanation →In a p-type semiconductor, the majority charge carriers are:
A p-type semiconductor is made by adding a trivalent impurity such as boron, aluminium, gallium or indium.
Read the full explanation →Which of the following impurities, when added to pure silicon, produces an n-type semiconductor?
An n-type semiconductor is made by doping with a pentavalent element, that is one with five valence electrons, such as phosphorus, arsenic, antimony or bismuth.
Read the full explanation →With a rise in temperature, the electrical resistance of a semiconductor:
A semiconductor has a small forbidden energy gap, so heating supplies thermal energy that pushes more electrons from the valence band into the conduction band, creating more electron-hole pairs.
Read the full explanation →Under which law are national parks and wildlife sanctuaries notified in India?
This Act provides for the declaration of national parks and wildlife sanctuaries, lists protected species in its schedules, and, after the amendment of 2002, added two further categories, conservation reserves and community reserves.
Read the full explanation →Which wetland, the largest in northern India, lies at the confluence of the Beas and the Sutlej?
The Harike wetland in Punjab, also called Hari-Ke-Pattan, was formed by a barrage at the point where the Beas joins the Sutlej, is the largest wetland of northern India, and is a Ramsar site rich in waterfowl.
Read the full explanation →The dugong, or sea cow, is best associated with which Indian marine protected area?
The dugong is a marine mammal that grazes on sea grass, and the sea grass beds of the Gulf of Mannar between Tamil Nadu and Sri Lanka are its principal habitat in India; the Gulf of Mannar was declared the country's first marine biosphere reserve in 1989 and the dugong…
Read the full explanation →Salim Ali, known as the Birdman of India, is associated with which of the following?
Salim Ali wrote this standard field guide, carried out the bird surveys on which several sanctuaries were notified, and was long associated with the Bombay Natural History Society; the Salim Ali Centre for Ornithology and Natural History at Coimbatore bears his name.
Read the full explanation →The Ramsar Convention, under which wetlands of international importance are designated, was signed in which year?
The Convention on Wetlands was signed in the Iranian city of Ramsar in 1971, which is why the sites designated under it are called Ramsar sites; it came into force in 1975, India became a party in 1982, and World Wetlands Day is observed on 2 February to mark the…
Read the full explanation →Which Indian wetland and bird area is the only protected sanctuary in the Union Territory of Lakshadweep?
Pitti is a tiny uninhabited coral islet in Lakshadweep, notified as the Pitti Bird Sanctuary, and is the breeding ground of sooty terns and other sea birds; it is the only wildlife sanctuary of the territory.
Read the full explanation →Chilika Lake, which contains the Nalaban Bird Sanctuary, is located in which state?
Chilika is a brackish water lagoon on the Odisha coast, the largest of its kind in Asia, separated from the Bay of Bengal by a long sand bar.
Read the full explanation →Which of the following is the first marine national park of India?
Declared in Gujarat in 1980, it was the first area in India to be notified as a marine national park, and it covers a chain of islands carrying coral reefs and mangrove along the Gulf of Kachchh.
Read the full explanation →Which of the following is the only marine turtle sanctuary of India, famous as the nesting ground of the olive ridley turtle?
Gahirmatha, on the Odisha coast beside the Bhitarkanika mangroves, is the only turtle sanctuary notified in India and protects the world's largest mass nesting ground of the olive ridley turtle, where the phenomenon of arribada, or mass nesting, takes place.
Read the full explanation →Keoladeo National Park, earlier known as the Bharatpur Bird Sanctuary, is located in which state?
Keoladeo National Park stands at Bharatpur in eastern Rajasthan and is unusual in being a man-made wetland, created by a ruler of Bharatpur as a duck shooting reserve and later turned into a sanctuary and then a national park.
Read the full explanation →In which state is the Bankapura Peacock Sanctuary situated?
The Bankapura Peacock Sanctuary lies within the ruins of Bankapura fort in Haveri district of Karnataka and is one of the very few protected areas in India notified specifically for the Indian peafowl, the national bird.
Read the full explanation →Section 79 of the Information Technology Act, 2000 relates to:
Section 79 gives an intermediary such as a network service provider or a social media platform a safe harbour, provided it merely transmits or hosts the content, does not initiate or modify it, and observes the due diligence prescribed by the rules; the Shreya Singhal judgment read the section down…
Read the full explanation →