RRB Group D GK Questions 2026

Hydrogen, nitrogen, oxygen and carbon dioxide all exist as gases at about 25 °C and normal atmospheric pressure. Hydrogen boils at about −253 °C, nitrogen at −196 °C and oxygen at −183 °C, so all three are gases at room temperature.

A plane mirror always forms a virtual image, one that cannot be caught on a screen, so calling it real is the false statement.

The F2 genotypes come out as 1 TT: 2 Tt: 1 tt, so pure tall plants (TT) and short plants (tt) are equal in number.

Methanoic acid, better known as formic acid, is the acid that ants inject when they sting, which is why the bite burns.

The stinging hairs of the nettle inject methanoic acid, also called formic acid, which causes the burning pain. Nettle is a herbaceous plant whose leaves carry fine, brittle hairs.

A microphone turns sound into an electrical signal, and a speaker turns an electrical signal back into sound. Both are transducers, devices that change energy from one form to another.

Only this equation has the same number of iron, hydrogen and oxygen atoms on both sides. Iron reacts with steam to form iron(II,III) oxide and hydrogen gas.

Any particle smaller than an atom is a subatomic particle, and the muon qualifies just as the electron, proton and neutron do.

Lysosomes are membrane-bound sacs of digestive enzymes that break down foreign material such as bacteria and worn-out cell parts. Lysosomes are formed by the Golgi apparatus and contain hydrolytic enzymes that work in an acidic interior.

Indian Railways raised its domestic coal supply to power stations during September 2026, moving an average of 443 coal rakes every day.

The correct answer is food grain, whose loading grew 25 per cent during September 2026, the steepest rise among the commodity groups listed by the Ministry of Railways.

The Ministry of Railways reported that loading in September 2026 reached 135.35 million tonnes, which was 6.14 per cent higher than the same month a year earlier.

Lipases split fats into fatty acids and glycerol. Fat digestion happens mainly in the small intestine.

A single-celled organism has no organs at all; the one cell takes in food through its surface or by forming temporary structures.

A healthy young human ear can hear sounds with frequencies from about 20 hertz to about 20,000 hertz. Frequency is the number of vibrations per second, measured in hertz, and our ears sense it as pitch.

Breaking down carbohydrates to release energy is respiration, which happens in the cytoplasm and mitochondria, not a job of chlorophyll.

Red blood cells far outnumber both platelets and white blood cells. A microlitre of healthy adult blood holds about 4.5 to 5.5 million red blood cells, about 1.5 to 4.5 lakh platelets and only about 4,000 to 11,000 white blood cells.

When the two mix, they release a rush of carbon dioxide that pushes water out onto the fire. In a soda-acid extinguisher a small bottle of dilute sulphuric acid sits inside a cylinder filled with a solution of sodium hydrogencarbonate (baking soda, NaHCO3).

Natural chlorine is a mixture of two isotopes, and their weighted average is about 35.5 u. Chlorine has two stable isotopes: chlorine-35, which makes up about 75 per cent of natural chlorine, and chlorine-37, about 25 per cent.

Nuclear power runs on uranium and thorium, mined minerals whose stock is finite, so it is a non-renewable source even though it is low in carbon.