RRB Group D GK Questions 2026

A solid that does not vaporise stays behind when the solvent is removed, whether the solvent is boiled off or the solid is made to crystallise out.

Because water is densest at 4°C, the bottom of a lake stays liquid and relatively warm while the surface freezes, so aquatic animals survive there.

Bronze is an alloy of copper and tin, usually about 88 parts copper to 12 parts tin. Adding tin makes copper harder, stronger and easier to cast, and bronze also resists corrosion well.

A hygrometer measures humidity, that is, the amount of water vapour or moisture in the air. The name comes from the Greek "hygros", meaning wet.

The Moon gives out no light of its own; it only reflects sunlight, so it is a non-luminous object. A luminous object produces and emits its own light, while a non-luminous object is seen only because it reflects light falling on it.

The Ministry of Mines reported that 59 public spaces were cleaned under the campaign with this many individuals taking part in the effort.

The correct answer is Shri G. Kishan Reddy, the Union Minister for Coal and Mines, who joined the drive at the market in Chanakyapuri in the national capital along with the Secretary of the ministry and senior officials.

The Ministry of Mines reported that this many Cleanliness Target Units were given a makeover under the campaign, and that the work drew 10,723 participants.

The five pledges, together called Panch Pran, were articulated by the Prime Minister from the ramparts of the Red Fort, and the Minister recalled them at this programme: the resolve to build a developed India, freedom from the colonial mindset, pride in the heritage of the country, unity and solidarity…

The Minister said that efforts were under way, under the guidance of the Prime Minister, to develop one lakh young leaders across the country, and he placed the MY Bharat portal at the centre of that effort as the route through which the young can find openings for participation, career…

He spoke at the programme held at a college in Kutiyana, in his own district, and called on young people to take the lead in nation-building and in the march towards a developed India.

Mosses and liverworts have no xylem or phloem, so water moves through them cell to cell. Bryophytes, such as Funaria (a moss) and Marchantia (a liverwort), are called the amphibians of the plant kingdom because they live on land but need water for fertilisation.

Copper with dilute nitric acid gives copper nitrate, water and nitric oxide: 3Cu + 8HNO 3 → 3Cu(NO 3 ) 2 + 2NO + 4H 2 O. Nitric acid is a strong oxidising agent, so metals usually do not release hydrogen from it; instead the acid itself is reduced, and…

The heat needed is 50 cal to warm the ice to 0°C, 800 cal to melt it, and 200 cal to warm all 20 g of water to 10°C. Take the specific heat of ice as 0.5 cal/g°C, the latent heat of fusion of ice as 80 cal/g and the…

Vinegar is a dilute solution of ethanoic acid, commonly called acetic acid, in water. Vinegar contains about 5 to 8 per cent ethanoic acid (CH 3 COOH) and is made by the fermentation of sugar or alcohol by acetic acid bacteria.

Cells made by the meristem lose the ability to divide and take on a fixed shape, size and job, and this change is called differentiation.

In water plants, parenchyma cells enclose large air cavities; this special form is called aerenchyma, and it helps the plants float.

Iron is more reactive than copper, so it pushes copper out of copper sulphate, and the freed copper coats the nail brown.

Rutherford found the nucleus to be positively charged, not neutral. In his gold foil experiment of 1911, Rutherford fired alpha particles at a very thin sheet of gold.

Only statement III is wrong, because colloidal particles are too small to be seen with the naked eye. Mixtures are graded by particle size.