NDA GK Questions 2026

An angle of incidence of 0° means the ray falls along the normal, and a ray along the normal passes into the next medium without bending.

On 3 March 2021 the UN General Assembly adopted a resolution, proposed by India, declaring 2023 the International Year of Millets.

The Bulgarian writer Georgi Gospodinov won the International Booker Prize 2023 for Time Shelter, translated from Bulgarian by Angela Rodel.

Four Stars of Destiny is the autobiography of General M. M. Naravane, who served as India's Chief of the Army Staff.

A Trojan is a program that looks useful or harmless but secretly carries harmful code, so it is a piece of malicious software, or malware.

On the pH scale every value below 7 means the solution has more hydrogen ions than hydroxide ions, which is what makes it acidic.

Mitosis keeps the chromosome number unchanged, so it never makes cells haploid; that is the work of meiosis. In mitosis one parent cell divides once and gives two daughter cells that are genetically identical to it.

It is caused by the bacterium Vibrio cholerae, which spreads through food and water polluted with human faeces. The bacterium was identified by Robert Koch in 1883.

Amuktamalyada is a Telugu work, not a Sanskrit one, so this statement is wrong. Krishnadevaraya (ruled 1509–1529) was the greatest king of the Tuluva dynasty of Vijayanagara.

Hair turns grey because the chemical make-up of the hair changes as the body stops producing the pigment melanin, so new substances form and the change cannot be reversed.

Lysosomes are small membrane-bound sacs full of hydrolytic enzymes that digest worn-out parts and foreign material inside the cell. Lysosomes are formed from the Golgi apparatus and were discovered by Christian de Duve.

The resistance of a conductor depends on its material and shape, not on how much current flows through it. For a cylindrical conductor, R = ρL/A, where ρ is the resistivity of the material, L the length and A the area of cross-section.

Oxygen makes up about 21 per cent of dry air by volume, second only to nitrogen. Dry air near the ground is about 78 per cent nitrogen, 21 per cent oxygen and 0.93 per cent argon, which is the third most abundant gas.

DTTI is an India–US forum launched in 2012 to deepen defence trade and to develop and produce defence technology together.

The enzyme breaks the β-lactam ring that gives penicillin its power. Penicillin was discovered by Alexander Fleming in 1928 from the mould Penicillium notatum.

In an insulator the electrons are tightly bound to their atoms, so there are almost no free electrons to carry a current.

Zinc gives up electrons more readily than iron, so it corrodes first and keeps the iron safe. Coating iron or steel with a thin layer of zinc is called galvanisation.

An ECG records the electrical signals that make the heart muscle contract with each beat. Each heartbeat starts at the sino-atrial (SA) node, the natural pacemaker in the right atrium.

An echo is sound that bounces back from a hard surface such as a wall, cliff or hill and reaches our ears again.

Both stress and pressure are force per unit area, so both are measured in newton per square metre, or pascal (Pa).