NDA GK Questions 2026

A Wing Commander of the Indian Air Force holds the same rank as a Lieutenant Colonel in the Army and a Commander in the Navy.

A crater is the bowl-shaped depression at the top of a volcano, around the opening through which lava, gas and ash come out.

A drumlin is a smooth, oval hill shaped by a moving glacier out of glacial till, so it is a landform of glacial deposition.

Uranus cannot normally be picked out by the naked eye and was discovered only in 1781, so ancient Indian astronomers never wrote about it.

Electromagnetic waves are transverse, not longitudinal, so this statement is false. In an electromagnetic wave the electric field and the magnetic field oscillate at right angles to each other and both at right angles to the direction in which the wave travels.

Operation Sadbhavna is the Indian Army's goodwill and civic action programme for people in remote and disturbed areas. The Army began it in the late 1990s in Jammu and Kashmir and later took it to Ladakh and parts of the North-East.

Podsolization is the soil process of cool, moist climates under coniferous forest, which lie in the high middle latitudes. In the cold, wet taiga belt, needle litter from pines and firs decays slowly and forms acidic humus.

While describing how the institutes have grown into engines of innovation and enterprise, the Defence Minister said the IIT ecosystem has supported over 6,000 start-ups, produced 56 unicorns and generated nearly 5,000 patents.

The Defence Minister said the proposal to set up a National Military Drone Technology Hub at IIT Kanpur, in collaboration with the Ministry of Defence, has made significant progress and that its approval process is nearing completion.

The campaign was launched by the Defence Minister in New Delhi and is the largest fundraising effort ever undertaken by any Indian Institute of Technology.

The normal human ear hears sound from about 20 hertz to 20,000 hertz, the audible range. Frequency, measured in hertz, is the number of vibrations per second, and it decides the pitch of a sound: the higher the frequency, the shriller the note.

Ultrasound is sound with a frequency above 20,000 Hz, the upper limit of human hearing. Humans hear sound between about 20 Hz and 20 kHz.

Propane is a light gaseous hydrocarbon that burns completely with a blue flame, leaving no smoke, soot or ash. A clean fuel burns completely, gives high heat and releases few pollutants.

Soft soaps are potassium salts of fatty acids, while ordinary hard bar soaps are sodium salts. Soap is made by saponification, heating an oil or fat with an alkali.

Magnesium, calcium and barium are all alkaline earth metals of group 2, and each has a valency of 2. Elements in the same group of the periodic table have the same number of electrons in their outermost shell, and so the same valency.

The atmosphere is heated mainly from below, by the long-wave heat the Earth's surface gives off, not directly by sunlight.

Their valencies are neon 0, magnesium 2, nitrogen 3 and silicon 4. Valency is the combining capacity of an atom, the number of electrons it loses, gains or shares to reach a stable octet.

Electric power is P = V × I, and 220 V × 0.6 A = 132 W. Power is the rate at which electrical energy is used, measured in watts; one watt is one joule per second, or one volt times one ampere.

Mitochondria are membrane-bound organelles, and only eukaryotic cells have membrane-bound organelles. Prokaryotes such as bacteria and cyanobacteria have no true nucleus and no membrane-bound organelles; their DNA lies in a region called the nucleoid, and they carry out respiration on their plasma membrane.

Only this split of boron-10 and boron-11 gives an average atomic mass of 10.81. The relative atomic mass of an element is the average of its isotopes' masses, each weighted by how common it is.