RRB Group D GK Questions 2026

Potential difference is the work done per unit charge, so V = W/Q = 24 J ÷ 2 C = 12 V. The potential difference between two points is the work needed to move one coulomb of charge from one point to the other.

Pepsin works in the strongly acidic stomach, while trypsin works in the mildly alkaline small intestine. Pepsin is secreted by the chief cells of the stomach as inactive pepsinogen, which hydrochloric acid from the parietal cells turns into pepsin.

The Narmada flows west through a rift valley and falls into the Arabian Sea. The Narmada rises at Amarkantak in Madhya Pradesh and flows west for about 1,300 km between the Vindhya and Satpura ranges, along a rift valley formed by faulting.

Kinetic energy equals p²/2m, so doubling the momentum p makes the kinetic energy four times as large. Momentum is p = mv and kinetic energy is KE = ½mv².

Mass by mass percentage is the mass of solute divided by the mass of the whole solution: 20 ÷ (20 + 180) × 100 = 10%.

Light keeps to a straight line only while its speed stays the same, which happens in a homogeneous, transparent medium.

Silver reacts with sulphur compounds in the air, mainly hydrogen sulphide, and forms a black coating of silver sulphide. This blackening is the tarnishing of silver, a kind of corrosion.

The ministry highlighted the contribution of the National Handloom Development Corporation Limited at Noida, whose offices held cleanliness drives, competitions and a tree plantation under Ek Ped Maa Ke Naam between 2 and 23 October 2026.

The ministry completed the review of every physical file it had identified for the purpose, and that total was 5,593, one of the parameters it reported as fully finished in the progress up to 25 October 2026.

Ministries run Special Campaign 6 under its guidance, and it has set up the web portal on which each ministry uploads progress so that the drive can be monitored centrally.

Osmosis is the passage of water from where water is more concentrated (a dilute solution) to where it is less concentrated, across a membrane that lets water through but holds back solutes.

Animal cells are bounded only by a flexible plasma membrane and have no rigid cell wall outside it. A cell wall is found in plants, where it is made mainly of cellulose, in fungi, where it is made of chitin, and in bacteria, where it is made of peptidoglycan.

Cytokinins are the plant hormones whose main job is to promote cell division, or cytokinesis, which gives them their name.

The eye lens focuses light on the retina, the light-sensitive layer at the back of the eye, where a real and inverted image is formed.

Starlight is bent again and again as it passes through layers of air whose temperature and density keep changing, so the star seems to flicker in brightness and position.

The packet’s density is 800 g divided by 1,000 cm³, which is 0.8 g/cm³, less than the density of both liquids.

For any position of a real object in front of a convex mirror, the image forms behind the mirror between P and F. A convex mirror bulges outward, and its focus and centre of curvature lie behind it.

In 1913 the English physicist Henry Moseley showed that atomic number, not atomic mass, is the fundamental property of an element.

Pyruvate, the ion of pyruvic acid (CH3COCOOH), is a three-carbon molecule. It is formed at the end of glycolysis, the first stage of respiration, which takes place in the cytoplasm of every living cell.

For a photon, energy equals momentum multiplied by the speed of light, E = pc, so a momentum of 10 MeV/c gives an energy of exactly 10 MeV.