Defence GK Questions 2026

Of the four options, oxygen is by far the most plentiful element; it makes up about 46% of the Earth's crust by mass.

The melting point is the minimum temperature at which a solid melts to become a liquid at atmospheric pressure, not the maximum.

For small swings the time period is T = 2π√(L/g), which contains the length and gravity but neither the mass nor the amplitude.

Apical meristem sits at the growing tips of stems and roots, and its dividing cells make them longer. Meristems are groups of cells that keep dividing throughout a plant's life.

Polyaromatic hydrocarbons are soot-related pollutants from incomplete burning; they are not among the gases that make up photochemical smog. Photochemical smog forms on warm, sunny days in cities with heavy traffic.

HIV spreads through body fluids such as blood, semen, vaginal fluid and breast milk, not through droplets from coughing, sneezing or talking.

The operations fall in 1965, 1971, 1984 and 1999, in that order: Riddle, Cactus Lily, Meghdoot, Safed Sagar. Operation Riddle was the Indian Army's thrust towards Lahore in September 1965, during the second India–Pakistan war.

Moving a substance from low to high concentration is uphill work, and the cell pays for it with ATP.

Ribosomes stuck on the outer surface of the endoplasmic reticulum give it a grainy, rough look under the electron microscope.

An ion-exchange resin or zeolite swaps the calcium and magnesium ions that cause permanent hardness for sodium or hydrogen ions.

Smooth muscle is a muscular tissue, one of the four basic animal tissues, not a connective tissue. Animal tissues are of four kinds: epithelial, connective, muscular and nervous.

Copper in the +1 state is reduced to metal, so it is the oxidant; sulphur of Cu2S is oxidised, so it is the reductant.

The two hemispheres always have opposite seasons, so one hemisphere's summer solstice is the other's winter solstice. On about 21 June the Sun is overhead at the Tropic of Cancer; the northern hemisphere has its longest day and summer begins there, while the southern hemisphere has its shortest day.

The Ghatampur Thermal Power Project stands at Ghatampur in Kanpur Nagar district of Uttar Pradesh. It is a coal-based plant of three units of 660 MW each, built by Neyveli Uttar Pradesh Power Limited, a joint venture of NLC India Limited and the Uttar Pradesh Rajya Vidyut Utpadan Nigam.

The RER is studded with ribosomes, the actual sites where amino acids are joined into proteins. Ribosomes read the message carried by mRNA and link amino acids in the right order.

A medium more concentrated than the cell is hypertonic, so water leaves the cell by osmosis. In osmosis water moves across a selectively permeable membrane from the side with fewer dissolved particles to the side with more.

Aerenchyma is a kind of parenchyma whose cells enclose large air-filled spaces. These air cavities keep aquatic plants such as water hyacinth, lotus and Hydrilla afloat and let oxygen move down to roots and stems that sit in waterlogged soil or under water.

Together the two resins take out every dissolved ion, which leaves demineralised water. In the cation exchange resin (written RH), metal ions such as Ca2+, Mg2+ and Na+ are swapped for H+ ions.

Radiation carries heat as electromagnetic waves, and these waves travel even through empty space. Heat moves in three ways.

This is the incorrect statement, because periodic motion repeats after every interval T, again and again. The time period T of a pendulum is the time for one complete oscillation, that is, the smallest interval after which the bob returns to the same position moving in the same direction.