Defence GK Questions 2026

In a wheelbarrow the wheel is the fulcrum, the load in the tray lies between the wheel and the hands, and the effort is applied at the handles, so the load sits in the middle, which defines a second class lever; a nutcracker, a bottle opener and a lemon squeezer…

In stable equilibrium the original position is the one of least potential energy, so a small displacement lifts the centre of gravity and the weight of the body brings it back, as with a cone resting on its base or a book lying flat on a table.

A zero net force gives translational equilibrium, so the body as a whole does not accelerate, and a zero net torque gives rotational equilibrium, so it does not begin to spin; complete equilibrium requires the two together.

Torque is the product of the force and the perpendicular distance of its line of action from the axis, so the same turning effect can be produced by a smaller force if that distance is made larger; a long handle therefore does the same work with less effort.

The magnitude of torque is r into F into the sine of the angle between the arm and the force, and the sine of an angle is largest, equal to one, at 90 degrees, so the whole of the force is then used in turning the body.

The centre of gravity is a geometrical point through which the resultant weight of a body acts, and by symmetry that point for a uniform ring is its geometrical centre, which lies in the empty space inside the ring.

When three forces are represented by the sides of a triangle taken in order, their vector sum is zero, because the three sides close the triangle, so the body cannot be pushed away; but the lines of action are different, so the system reduces to a couple.

Torque is the product of a force and the perpendicular distance of its line of action from the axis of rotation, so its unit is the unit of force multiplied by the unit of length, the newton metre, and its dimensional formula is M L squared T to the power…

Sankardeva, who lived in the fifteenth and sixteenth centuries, preached the Ekasarana Dharma, devotion to a single god without caste barriers or elaborate ritual, composed the Kirtan Ghosa and the Borgeets, created the one-act Ankiya Naat plays, and established the satra monasteries and the namghar prayer halls that still organise…

Chilarai, whose given name was Shukladhwaj, was the brother and commander of the Koch king Nara Narayan, the son of the founder Biswa Singha, and his campaigns in the sixteenth century carried Koch power across the lower Brahmaputra valley before the kingdom split into Koch Bihar and Koch Hajo.

The Buranjis are the official and family histories kept by the Ahom state and its nobles, written first in the Tai Ahom language and script and later in Assamese, and they are the main written source for the political history of the Brahmaputra valley between the thirteenth and the nineteenth…

The treaty of 1826 ended the First Anglo-Burmese War, and by it Burma gave up its claims over Assam, Manipur, Cachar and Jaintia and ceded Arakan and Tenasserim, so Assam passed to the East India Company and six centuries of Ahom rule came to a close.

Mir Jumla, Aurangzeb's governor of Bengal, marched up the valley in 1662, occupied the capital Garhgaon and forced the Ahom king Jayadhwaj Singha to accept the Treaty of Ghilajharighat in 1663, under which the Ahoms paid a heavy indemnity, ceded territory and gave hostages.

Lachit Borphukan commanded the Ahom forces in 1671 and destroyed the Mughal flotilla at Saraighat near Gauhati by fighting a cavalry army on water during the rains; his birth anniversary is kept as Lachit Divas on 24 November, and the best passing cadet of the National Defence Academy receives a…

Pratap Singha, also called Susenghphaa, who ruled in the first half of the seventeenth century, created the Borphukan as viceroy of the lower Brahmaputra valley with his seat at Gauhati, and the Borbarua as the chief executive and judicial officer of the upper valley.

Suhungmung, better known as the Dihingia Raja, ruled from 1497 to 1539, annexed the Chutiya kingdom of the upper valley in 1523, broke Kachari power, and was the first Ahom king to take a Hindu title, Swarganarayan, which marks the dynasty's entry into the wider Indian religious world; the Bengal…

The Ahom administration graded its officers by the number of paiks, the men liable to compulsory service, placed under them, and the Hazarika commanded a thousand, the name itself coming from the word for a thousand.

Sukaphaa settled at Charaideo near modern Sivasagar in 1228, and even after the administrative capital shifted the site remained the ritual centre of the dynasty, where the kings and queens were buried under earthen mounds called moidams; the Charaideo moidams were inscribed on the UNESCO World Heritage List in 2024.

Sukaphaa was a Tai prince from the upper Irrawaddy region who crossed the Patkai hills with a small following and founded the Ahom kingdom in 1228, settling at Charaideo near present-day Sivasagar; Assam keeps his memory as Asom Divas on 2 December.

The Bering Strait lies between the easternmost point of Asia and the westernmost point of North America and links the Bering Sea of the Pacific with the Chukchi Sea of the Arctic Ocean; the International Date Line runs through it, and the Diomede Islands within it belong one to Russia…