RRB ALP GK Questions 2026

An amphoteric oxide reacts with both acids and bases to give a salt and water. Aluminium oxide dissolves in hydrochloric acid to give aluminium chloride and in sodium hydroxide to give sodium aluminate, so it behaves as a base in one case and as an acid in the other.

Benzene has the formula C6H6 and a ring of six carbon atoms, each carrying one hydrogen. Count the sigma bonds first: six carbon-carbon bonds around the ring and six carbon-hydrogen bonds give twelve sigma bonds.

Ethylene, also called ethene, has the formula C2H4, and its two carbon atoms share two pairs of electrons, which is a carbon-carbon double bond made of one sigma and one pi bond; it is the simplest alkene.

In a double displacement reaction two compounds exchange their ions, so both reactants must be compounds. Here hydrogen and oxygen are elements combining to form a single product, water, which makes it a combination reaction and also a combustion and redox reaction, but certainly not a double displacement.

The new service runs between Machilipatnam and Kurnool City by way of Vijayawada on South Coast Railway, and that is the distance the train covers between the two ends.

The stretch is only 6 km long but it carries high-grade iron ore and pellets from the Bolani mines of SAIL and from private sidings towards steel plants and ports, and the doubling has been cleared at a completion cost of 122 crore rupees.

The Varanasi division, abbreviated BSB, belongs to this zone, and the sanction of 223 crore rupees extends Kavach 4.0 across the balance sections of that division, a total of 614.75 route kilometres.

In a suspension the particles of the solute are large enough to be seen and do not dissolve; they stay spread through the liquid only while it is stirred and settle to the bottom when it is left standing.

Johann Wolfgang Dobereiner, a German chemist, grouped elements of similar properties in sets of three that he called triads. His rule was that the atomic mass of the middle element is about the average of the other two.

Spirogyra is a green filamentous alga found in ponds, and when its filament grows long it simply breaks into two or more pieces.

A tissue is a group of cells that come from the same source, look alike and work together at one job.

Carbon occurs in nature in two ways, free and combined. In the free state the element stands alone, as in diamond, graphite and coal; diamond is pure carbon whose atoms are each joined to four others in a rigid three dimensional network, which is why it is the hardest natural…

The brain is divided into fore-brain, mid-brain and hind-brain, and the fore-brain is the main thinking part. Its largest portion is the cerebrum, whose folded outer layer holds separate areas for hearing, sight, smell and touch, for reasoning and memory, and for ordering voluntary movement.

Early Indian thinkers held that everything in the world is made of five basic elements, the panchamahabhuta: earth, water, fire, air and space or ether.

It is a reduction division: one parent cell with the full, diploid set gives four cells with half the number of chromosomes, the haploid set.

Water behaves unlike most liquids between 0 and 4 degrees Celsius, a behaviour called the anomalous expansion of water. Almost every substance shrinks as it is cooled, but water shrinks only until it reaches 4 degrees Celsius.

Malleability is the property by which a metal can be beaten into thin sheets without breaking, which is how aluminium foil and the sheets used in car bodies are made.

A binary number is written with only the digits 0 and 1, and each place stands for a power of two.

Blood is filtered in the glomerulus of the nephron, and the filtrate that first enters the tubule still holds many useful substances.

A ligament is the connective tissue that joins one bone to another at a joint. It is very elastic and strong, and it holds the bones in place so that a joint can move without the bones slipping apart.