NDA GK Questions 2026

Hydrogen adds across the carbon–carbon double bonds of the oil. Vegetable oils are unsaturated: their fatty acid chains contain C=C double bonds, which keep them liquid.

He patented the flying shuttle in England in 1733. The flying shuttle let a single weaver send the thread across the loom by pulling a cord, so wider cloth could be woven much faster.

The charge moves exactly opposite to the field, and a magnetic field exerts no force on a charge moving along its line.

It takes most force to start an object moving, less to keep it sliding and least to keep it rolling.

The Equator and the Prime Meridian both lie on circles whose centre is the centre of the Earth.

Urea, CO(NH₂)₂, has a molar mass of 60 g, of which 28 g is nitrogen and 4 g is hydrogen.

Mature human red blood cells lose these organelles as they develop. Red blood cells are made in the red bone marrow and push out their nucleus and other organelles before entering the blood.

The slightest push makes the ball fall off and it does not come back. A body is in unstable equilibrium when a small displacement lowers its centre of gravity, so the forces acting on it move it further away instead of back.

It is a carbon compound with a carboxyl group, so it is an organic acid. Acetic acid (ethanoic acid, CH₃COOH) contains the –COOH group typical of carboxylic acids.

Gandhiji first used and shaped Satyagraha there while fighting racial laws against Indians. Gandhiji went to South Africa in 1893 as a lawyer and stayed about 21 years.

Soaps are sodium or potassium salts of long-chain carboxylic (fatty) acids, not ammonium salts. A soap molecule has a long hydrocarbon tail that mixes with oil and an ionic head that faces water.

Indian farming is dominated by food crops, not cash crops. Most of India’s cropped area is under food grains such as rice, wheat, millets and pulses, grown largely to feed the farm family and the country.

Diamond and crystalline silicon have the same crystal structure. Isomorphous means having the same crystal form.

Tomb of Sand is the English translation of her Hindi novel Ret Samadhi. Ret Samadhi was translated into English by the American translator Daisy Rockwell.

Both quantities change with temperature, and resistance is directly proportional to resistivity, while resistivity does not depend on the wire’s size.

The restoring force on the bob is mg sin θ. For small angles sin θ is almost equal to θ, so the force becomes proportional to the displacement and points back towards the mean position.

Myopia is short-sightedness: near objects look sharp but distant ones look blurred. In a myopic eye the eyeball is too long or the eye lens is too curved, so light from a distant object comes to a focus in front of the retina instead of on it.

Rain is called acid rain when its pH falls below 5.6. Even clean rain is slightly acidic, because carbon dioxide in the air dissolves in it and forms weak carbonic acid, which brings its pH down to about 5.6.

Bretton Woods set up fixed, not floating, exchange rates. At the Bretton Woods Conference in New Hampshire, USA, in July 1944, 44 Allied nations agreed on a new post-war money order.

Each reaction is labelled with its correct type, so every pair is matched correctly. In I, iron is more reactive than copper and pushes it out of copper sulphate, a displacement reaction.