RRB NTPC GK Questions 2026

The law of conservation of mass, stated by Antoine Lavoisier in 1789, says that in a chemical reaction mass is neither created nor destroyed.

When copper is left in moist air for a long time, it slowly reacts with oxygen, water vapour and carbon dioxide.

On a hot day the air just above a road or desert sand is much hotter, and so optically rarer, than the air higher up.

At room temperature and normal pressure only two elements are liquids: mercury, a metal, and bromine, a non-metal. Mercury melts at about −39 °C and is used in thermometers and barometers because it stays liquid over a wide range and does not wet glass.

India adopted the parliamentary form of government from Britain, often called the Westminster model.

Potassium permanganate, KMnO₄, forms dark purple crystals that contain no water of crystallization; its formula has no attached water molecules.

This statement is wrong because bryophytes, the mosses and liverworts, have no true vascular tissue: they lack xylem to carry water and phloem to carry food.

A reducing agent is the substance that is itself oxidised while it reduces something else. In hydrazine, N₂H₄, nitrogen has an oxidation number of −2; in nitrogen gas, N₂, it is 0.

World Humanitarian Day is marked every year on 19 August to honour aid workers who have been killed or injured while helping others, and to draw attention to people affected by crises.

A p-type semiconductor is made by adding a small amount of a trivalent impurity, such as boron, aluminium, gallium or indium, to pure silicon or germanium.

Friction acts along the surfaces in contact, opposite to the direction of motion, not along the line joining the centres of two bodies, so it is non-central.

An angle of incidence of zero means the ray falls along the normal, that is, perpendicular to the surface. By Snell's law, n₁ sin i = n₂ sin r; if i is zero, sin i is zero, so sin r is also zero and the angle of refraction is zero.

Lime water is a clear solution of calcium hydroxide, Ca(OH)₂. When carbon dioxide is passed through it, insoluble calcium carbonate, CaCO₃, forms as a fine white precipitate, which makes the lime water turn milky.

Bronze is made by mixing copper (Cu) with tin (Sn), usually about nine parts copper to one part tin. Adding tin makes the metal harder, stronger and more resistant to corrosion than pure copper, which is why bronze was used for tools, weapons, bells, coins and statues.

Fungi have no chlorophyll, so they cannot make their own food by photosynthesis.

Sulphur dissolves completely in carbon disulphide, so the two form a true solution, and a solution is a homogeneous mixture.

Light, small and dry pollen is a feature of wind-pollinated plants, not of plants that depend on insects. Insect-pollinated (entomophilous) flowers have to attract a visitor and then make the pollen travel on its body.

The review covered claims received and disposed of under this law, the titles distributed, Community Forest Resource Rights and habitat rights for Particularly Vulnerable Tribal Groups, all of which flow from this statute.

The Ministry of Tribal Affairs noted that habitat rights have been recognised for only this small number out of all the Particularly Vulnerable Tribal Groups in the country, and for that reason it urged the States to expedite recognition and to build a habitat rights roadmap for each group.

The Ministry reported that about 54 lakh claims had been received across the country and that 43.56 lakh of them, which is this share, had been disposed of by that date.