Defence GK Questions 2026

The Indian Civil Service was a modern, merit-based bureaucracy filled through open competitive examinations from 1853, but Indians were kept out of it in practice for decades.

The body falls freely from rest through 50 m, so v² = 2gh = 2 × 9.8 × 50 = 980, giving v = √980, about 31.3 m s⁻¹; its total energy at release is all potential energy, mgh = 2 × 9.8 × 50 = 980 J. Because the…

Almost all the mass of an atom is in its nucleus, so the mass number, which the question calls atomic mass, is the total of protons and neutrons, the two kinds of nucleons.

This is the defining condition of simple harmonic motion, written F = −kx, where k is the force constant and the minus sign shows that the force always points back towards the mean position.

The Belt and Road Initiative is China's plan, announced by President Xi Jinping in 2013, to build roads, railways, ports, pipelines and power links connecting China with Asia, Europe and Africa.

Using the lens formula with sign conventions, the object is found to be 10 cm from the lens, and the magnification v/u comes to 0.5.

The Bengali poet Mukundaram Chakrabarti, honoured with the title Kavikankan, composed the Chandimangala in the sixteenth century. Mangalkavyas are long Bengali narrative poems in praise of a deity, and the Chandimangala celebrates the goddess Chandi.

In the rock-salt structure of sodium chloride, every Na+ ion is surrounded by six Cl− ions and every Cl− ion by six Na+ ions, so the coordination number is 6 for both.

In April 1930, C. Rajagopalachari led a band of volunteers from Tiruchirappalli, then called Trichinopoly, to Vedaranyam on the Tanjore coast, where they broke the salt law.

The statement is false because CaSO4·2H2O is gypsum; Plaster of Paris is calcium sulphate hemihydrate, CaSO4·½H2O. When gypsum is heated to about 373 K, it loses three-quarters of its water and becomes Plaster of Paris, a white powder.

Tidal volume, the air breathed in or out in one normal quiet breath, is only about 500 millilitres in a healthy adult, the smallest of the four volumes listed.

Frogs and most fishes release their eggs and sperm into water, where fertilisation takes place outside the female's body. In external fertilisation, a large number of eggs and sperm are shed together, because many are lost to currents and predators.

India beat Pakistan by 17 runs in the final of the Women's Twenty20 Asia Cup in Bangkok, Thailand, in December 2016.

The Geiger-Müller counter detects and counts the ionising radiation given out by radioactive substances, so it is the standard instrument for measuring radioactivity.

Muscle cells are packed with the contractile proteins actin and myosin, whose filaments slide over each other to shorten the cell and produce movement.

Nimbostratus is a thick, dark grey layer cloud that covers the whole sky and gives steady, continuous rain or snow, often for many hours.

Ultrasound is sound with a frequency above 20,000 hertz, the upper limit of human hearing, so its defining feature is a higher frequency than audible sound.

The atomic number, the number of protons in the nucleus, decides which element an atom is, and no two elements share it.

The frequency of a wave is set by its source, so it does not change when light passes from air into glass; only the speed and wavelength change.

Since both wires have the same material and thickness, resistance is proportional to length, so R2 = 2R1, and the parallel combination works out to R = 2R1/3.