RRB Group D GK Questions 2026

Growth with repair and metabolism are two of the features that mark living beings off from non-living things. A living body grows from inside by making new cells from the food it takes in, and it heals wounds and replaces worn-out tissue.

Lemon juice is acidic and rich in vitamin C, which together slow the enzyme reaction that browns cut apple. When an apple is cut, the enzyme polyphenol oxidase in its cells meets oxygen in the air and oxidises the fruit's phenolic compounds into brown pigments (melanins).

Light from the bottom bends as it passes from water into air, so the bottom seems nearer than it really is.

When oxygen runs short during hard exercise, muscle cells break glucose down anaerobically, and lactic acid is the by-product. In glycolysis, which takes place in the cytoplasm, one molecule of glucose splits into two molecules of pyruvate and yields a little ATP.

Lymph is plasma that has leaked out of the capillaries, and red blood cells are too large to pass through the capillary walls.

The correct answer is Aichi-Nagoya, Japan, the host of the Asian Games at which the Indian women kabaddi team took the gold medal by beating Iran in the final.

The correct answer is Pushpa Rana, who led the side as captain while Neeta Moreshwar Dadwe served as head coach of the gold-winning team.

India met Iran in the women kabaddi final of the Asian Games and finished ahead 37-34 in a contest that remained close until the final raids, a result that let India keep the continental title it already held.

Plant cells have a cellulose wall and one large central vacuole, but they do have a plasma membrane, just like animal cells.

Bleaching powder is an oxidising agent, not a reducing agent, so this statement is the false one. Bleaching powder, calcium oxychloride (CaOCl₂), is made by passing chlorine gas over dry slaked lime, Ca(OH)₂.

The ball keeps slowing down by about 9.8 m/s every second until its speed becomes zero at the top, which takes 40 ÷ 9.8 ≈ 4 seconds.

On heating, silver oxide breaks down into silver metal and oxygen, while zinc oxide and magnesium oxide stay unchanged. The reaction is 2Ag₂O → 4Ag + O₂.

Sexual reproduction mixes the genes of two parents, so the young differ from each other and from their parents, and variation helps a species survive changing conditions.

Pulling the hands back stretches the time in which the ball stops, so its deceleration and the force on the hands become smaller.

Among the alkali metals, reactivity with water increases down the group, so lithium, at the top, is the least reactive.

Washing soda is sodium carbonate decahydrate, sodium carbonate with ten molecules of water of crystallisation.

Red, green and blue are the primary colours of light because mixing them in different proportions produces all other colours.

Deep-sea divers breathe a mixture of oxygen and helium because helium does not dissolve much in blood under high pressure.

Besides the nucleus, these are the only organelles of a plant cell that carry their own DNA. Mitochondria and chloroplasts have small circular DNA molecules and their own 70S ribosomes, so they can make some of their own proteins and divide on their own.

A body sinks when its weight is greater than the buoyant force of the water it displaces, which happens when it is denser than water.