SSC CGL GK Questions 2026

The post office was opened in 2011 on a houseboat on the Dal Lake in Jammu and Kashmir and is the first of its kind anywhere in the world, offering ordinary counter services along with a small philately museum.

India joined the Universal Postal Union on 1 July 1876 and was the first country in Asia to do so, which gave Indian mail access to the Union's common rules for international post.

The Universal Postal Union was created by the Treaty of Bern signed on 9 October 1874, and the anniversary of that treaty is kept as World Post Day; India observes National Postal Week from this date.

Passed while Lord Dalhousie was Governor-General, it made the posts an all-India department, created the post of Director General of Post Offices and fixed postage by the weight of a letter alone, so that distance no longer mattered.

It was issued in 1852 in the province of Sind by Sir Bartle Frere, its Commissioner, and was the first adhesive postage stamp brought out anywhere in Asia.

Zone 9 is the only one of the nine PIN zones that is functional rather than geographical: it covers Army Post Office and Field Post Office addresses wherever the units concerned are posted, so that mail to serving personnel need not disclose their location.

The first of the six digits identifies one of the nine postal regions or zones into which the country is divided for the purpose of the PIN.

He was an Additional Secretary in the Union Ministry of Communications and a Sanskrit scholar, and he worked out the six-digit code that came into use on 15 August 1972.

The six-digit Postal Index Number was brought into use on 15 August 1972 to replace the practice of writing out long postal addresses that often repeated place names found in several states.

The space agency made the engine by fusing metal powder with a laser and tested it successfully, reducing the number of separate parts in the engine from fourteen to a single printed piece and cutting both the material used and the time taken to build it.

Because the model receives readings from the real machine, building or city as it works, it behaves as the real asset behaves, and engineers can test a change, foresee a failure or plan maintenance on the model without disturbing the original.

The strategy was released by that ministry in 2022 to build a domestic ecosystem for additive manufacturing, covering machines, materials and software, the creation of Indian intellectual property and the skilling of workers, in line with the Make in India and self-reliance programmes.

The country's first 3D-printed post office was built at Cambridge Layout in Bengaluru and opened in 2023, its walls laid down by a concrete printing robot working from a digital design, with technical guidance from an Indian Institute of Technology.

XR is the collective name for augmented reality, virtual reality and mixed reality together, and is used whenever a statement is meant to cover all the technologies that blend the physical world with digital content.

In augmented reality the room, street or object in front of the user stays visible and images, text or sound are added on top of it, as when a camera labels a monument or a windscreen display shows directions.

He popularised the phrase virtual reality in the late 1980s while building and selling some of the first commercial headsets and data gloves, and the name has stuck to the technology ever since.

The novel, published in 1992, uses the word metaverse for a shared virtual city that people enter through goggles and move about in as avatars, and the term was taken up decades later for persistent three-dimensional online worlds.

Milling on a computer-controlled machine is a subtractive process: a rotating cutter removes material from a solid block until the shape remains, so no layers are added.

An STL file describes the outer surface of a three-dimensional object as a mesh of triangles and carries no colour, material or texture information.

He invented stereolithography in the mid-1980s, in which a laser hardens liquid photopolymer resin point by point, and in doing so built the first working 3D printer; he also went on to found a company to sell the machines.