RRB Group D GK Questions 2026

The Transmission Control Protocol first sets up a connection through a three-way handshake, then numbers every segment, waits for an acknowledgement for each and sends it again if none arrives, and finally hands the data to the application in the original order.

Full duplex means both ends can send and receive at the very same moment, and on a telephone call each speaker can talk while still hearing the other, so traffic flows in both directions together.

The registered jack numbered 45 is the eight-pin plastic plug crimped on the end of an unshielded twisted pair Ethernet cable, and it is what clicks into the network port of a computer, a switch or a router.

In a ring the machines form a closed loop and a small control frame called a token keeps circulating around it; only the computer holding the token may put data on the ring, and when it finishes it releases the token to the next machine.

The Media Access Control address is the permanent physical address written into the network interface card by its maker, and it is 48 bits long, shown to users as twelve hexadecimal digits in six pairs such as 00:1A:2B:3C:4D:5E. The first half identifies the manufacturer and the second half the particular…

A router joins two or more different networks and decides, for every packet, which outgoing line will carry it towards its destination.

In a full mesh every node is joined directly to every other node, so the number of links equals the number of pairs that can be formed from the nodes, given by the formula n(n-1)/2.

In a star network every computer has its own cable running to a central hub or switch, so the shape resembles the spokes of a wheel.

GPRS was added to the 2G cellular system so that the same radio channel could carry data in packets instead of holding a circuit open the way a voice call does.

A modulator changes the form of a signal: it loads the digital bits produced by a computer onto an analog carrier wave so that they can travel over a telephone line, a cable or a radio link.

The attack surface of a system is the total collection of every point at which an unauthorised person could try to enter it or pull data out of it: open ports, running services, user accounts, login pages, removable drives and even the employees who can be tricked.

Amartya Sen published this book in 1981 and showed, using the Bengal famine among other cases, that famines occur not merely because food is short in a country but because groups of people lose the ability to command food, which he called a failure of entitlement; the work was central…

The Swedish economist Gunnar Myrdal published this long three-volume study of South and South East Asia in 1968, examining why the region stayed poor and pointing to institutions, land relations, administration and what he called the soft state; the title deliberately echoes Adam Smith's Wealth of Nations.

Ambedkar, trained as an economist before he became the chief architect of the Constitution, submitted this study at the London School of Economics and published it in 1923; it traces the history of Indian currency and argues for a stable measure of value, and its reasoning fed into the debate…

Azad, who presided over the Congress during the Quit India years and became independent India's first Education Minister, dictated this account of the last phase of the freedom struggle and of Partition; his birthday, the eleventh of November, is observed as National Education Day.

Gandhi wrote Hind Swaraj, also published in English as Indian Home Rule, in 1909 while sailing from London to South Africa, and he cast it as a dialogue between a reader and an editor; in it he rejects industrial civilisation and modern machinery, and argues that true self-rule means rule…

Jean-Jacques Rousseau published The Social Contract in 1762 with the opening claim that man is born free yet everywhere is in chains, and he held that legitimate authority rests only on the general will of the whole people, an idea that fed directly into the French Revolution and into the…

The Florentine writer Machiavelli wrote The Prince in 1513 and it was published in 1532; it advises a ruler to judge an action by whether it preserves the state rather than by whether it is virtuous, and for this it is called the first work of modern political realism and…

Written during the Great Depression and published in 1936, this book argued that an economy can settle at a level of high unemployment on its own, and that the remedy is to raise effective demand through government spending; it created macroeconomics as we know it and the whole school called…

Karl Marx published the first volume of Das Kapital in 1867 as his full critique of the capitalist mode of production, built around surplus value and the exploitation of labour; the later volumes were edited and brought out by Friedrich Engels after Marx died.