NDA GK Questions 2026

The Asian-African Conference met at Bandung in Indonesia in April 1955 with twenty-nine newly independent countries, condemned colonialism and racialism, and endorsed the principles of peaceful coexistence; it is often called the forerunner of the Non-Aligned Movement.

The Treaty of Friendship, Co-operation and Mutual Assistance was signed in the Polish capital on 14 May 1955, which is why the alliance carries that city's name, although its forces were commanded from Moscow.

The North Atlantic Treaty was signed at Washington on 4 April 1949 by twelve countries, during the Berlin blockade, and bound its members to treat an attack on one as an attack on all.

Churchill, by then out of office, spoke at Westminster College in Fulton on 5 March 1946 and said that an iron curtain had descended across the continent from Stettin in the Baltic to Trieste in the Adriatic.

If the frequency of the soldiers' rhythmic steps happens to match the natural frequency of the bridge, the bridge is driven at its own frequency and its amplitude of vibration can build up to a dangerous level; breaking step destroys the rhythm and avoids the risk.

The Dutch scientist Huygens designed the first working pendulum clock in 1656, after Galileo had noticed that a swinging lamp took the same time for each swing whether it swung far or little, the property called isochronism.

In simple harmonic motion the acceleration equals minus omega squared times the displacement, so it grows with displacement and is greatest at the ends of the path, where its value is A omega squared and it points back towards the centre.

Potential energy is proportional to the square of the displacement, so it is greatest where the displacement is greatest, that is at the two ends of the path, where the body is momentarily at rest and its kinetic energy is zero.

The time period varies inversely as the square root of g, so if g falls to one sixth, the period is multiplied by the square root of six, about 2.45 times; the pendulum swings more slowly and a pendulum clock taken to the moon would lose time badly.

The time period varies as the square root of the length, so multiplying the length by four multiplies the period by the square root of four, that is by two; to double the period of a pendulum its length must be made four times.

A second's pendulum is one whose time period is exactly two seconds, so that each swing from one side to the other takes one second.

The time period of a simple pendulum is two pi times the square root of the length divided by g, in which the mass of the bob does not appear at all; a heavy bob and a light bob of the same length keep the same time, which is the…

A swing is a pendulum, and its speed is greatest at the lowest point, where all the potential energy gained at the top has turned into kinetic energy.

In simple harmonic motion the velocity is given by omega times the square root of A squared minus x squared.

The English engineer Thomas Savery patented a steam pump in 1698 and called it the Miner's Friend, as it was meant to pump water out of flooded mines.

The French set up their first factory in India at Surat in 1668, under François Caron. The French East India Company was founded in 1664 under the patronage of King Louis XIV and his minister Colbert, making it the last of the major European companies to reach India.

Napoleon defeated Austria at Wagram near Vienna in July 1809, and Austria signed the Treaty of Schönbrunn in October 1809.

Each half of the wire has a resistance of 10 Ω, and two 10 Ω resistors in parallel give 5 Ω. The resistance of a wire is R = ρL/A, so it is directly proportional to its length when the material and thickness stay the same.

The focus, also called the hypocentre, is the point inside the earth where the energy of an earthquake is first released and from where its waves start.

In myopia, or short-sightedness, a person sees near objects clearly but distant objects look blurred because their image forms in front of the retina.