NDA GK Questions 2026

In a closed loop system a sensor measures what the process is actually doing, that measurement is compared with the desired value, and the controller acts on the difference, which is what a thermostat, a cruise control or a water level controller does.

SVAMITVA, launched in 2020 by the Ministry of Panchayati Raj, flies drones over the abadi or inhabited area of villages to make accurate maps, from which residents are given property cards that record their ownership and can be used to raise loans.

A SCADA system gathers readings from sensors and controllers spread over a plant, a grid or a water network, shows them on screens in a control room, records them, and lets an operator send commands back, which is why it is described as supervisory control together with data acquisition.

A PLC is a rugged industrial computer that reads the state of switches and sensors as inputs, runs a stored programme of logic, and switches motors, valves and lamps as outputs, so that a machine or a whole line runs by itself.

Vyommitra has a head, a face, arms and a torso but no legs, which is why it is called half humanoid, and it has been built to ride an uncrewed flight of the Gaganyaan human spaceflight programme, operate switches, watch the panels and report conditions as a crew member would.

Lakshya was developed by the Aeronautical Development Establishment of the DRDO to be flown as a target so that gun crews and missile units can practise against a realistic moving aircraft, and it is recovered by parachute.

A UAV is an aircraft with no pilot on board, flown either by a remote pilot or by its own programme, and when it is counted together with its ground control station and the radio link between them the whole is called an unmanned aircraft system.

Digital Sky is the online platform of the Directorate General of Civil Aviation on which a drone is registered and given its unique identification number, on which the airspace map with its green, yellow and red zones is published, and through which flight permissions are sought.

The rules class drones by all up weight, which includes the battery and the payload, and the nano class is the smallest, up to 250 grams, which is why the lightest toy and camera drones fall in it and are treated most lightly by the law.

Asimov set out the three laws in his science fiction, by which a robot may not harm a human being, must obey the orders given by human beings except where that conflicts with the first law, and must protect itself except where that conflicts with the first two laws; he…

The Czech writer Karel Capek used the word in his play R.U.R., or Rossum's Universal Robots, written in 1920, taking it from the Czech word robota, which means forced labour.

Automation is the technology in which mechanical parts, electronics and computer based control are put together so that a process is controlled and operated with little human help, which is exactly the description in the question.

Savitri Khanolkar, who designed the decoration, placed the state emblem of India at the centre of the circular bronze medal and set four replicas of the Vajra, the thunderbolt of Indra, around it, so that the medal carries a sense of irresistible force; the reverse bears the words Param Vir…

Fighting with 17 Poona Horse in the Shakargarh sector in December 1971, Khetarpal refused to abandon his burning tank and continued to engage advancing armour until he was killed, holding the bridgehead across the Basantar river; the award was posthumous, and Major Hoshiar Singh of 3 Grenadiers received the Param…

Batra, of 13 Jammu and Kashmir Rifles, led the recapture of heights in the Dras sector during the Kargil operations of 1999 and was killed while rescuing an injured soldier; the award was posthumous.

In June 1987 Naib Subedar Bana Singh of the 8th battalion of the Jammu and Kashmir Light Infantry led a small party up a sheer ice wall to take the highest post on the Siachen Glacier, held by the enemy and known as Quaid Post, and the position was renamed…

In November 1962 Major Shaitan Singh commanded a company of 13 Kumaon at Rezang La in the Chushul sector of Ladakh, which fought on against overwhelming numbers until almost the whole company had fallen; he moved from post to post under fire to steady his men and was killed, and…

In the Khem Karan sector in September 1965, Abdul Hamid of 4 Grenadiers used a recoilless gun mounted on a jeep to destroy Pakistani Patton tanks at close range in the fields of Asal Uttar, and he was killed while engaging another; the battle ruined so much armour that the…

Salaria, of the 3rd battalion of the 1st Gorkha Rifles, was serving with the United Nations force in the Congo in 1961 when he led a small party against a much larger armed group blocking a vital road near Elisabethville; he was killed in the action, and his is the…

During the Indo-Pakistani war of 1971 he took off alone from Srinagar airfield while it was under attack by a formation of enemy aircraft, engaged them in the air over the airfield and was killed; the award was posthumous, and he remains the only member of the Air Force to…