RRB Group D GK Questions 2026

Asia and Europe lie on one landmass, and geographers mark the dividing line along the Ural mountains and the Ural river, then the Caspian Sea, the Caucasus and the Black Sea.

Nepal touches five Indian states, namely Uttarakhand, Uttar Pradesh, Bihar, West Bengal and Sikkim, which is the largest number of States for any neighbour of India.

It stands on the border of Sikkim in India and the Taplejung district of eastern Nepal, and is the highest peak within India as well as the third highest in the world.

It runs for about eight hundred kilometres between the Malay Peninsula and the Indonesian island of Sumatra, joining the Andaman Sea with the South China Sea, and is the longest strait in the world as well as one of the busiest shipping lanes, carrying a large share of the oil…

Vitamin D, which the skin makes in sunlight and which is also present in milk, eggs and fish liver oil, is needed for the absorption of calcium and phosphorus from food.

Cardiac muscle shows the cross stripes of skeletal muscle under the microscope, but it is not under the control of the will and it beats rhythmically on its own, driven by the pacemaker of the heart; its cells are branched and joined end to end by intercalated discs, which let…

In the sliding filament theory of contraction, a nerve impulse causes calcium to be released from the sarcoplasmic reticulum; the calcium exposes binding sites on the thin actin filaments, the heads of the thick myosin filaments attach to them and swivel, using energy from ATP, and the actin is pulled…

A tendon is a cord of white fibrous connective tissue, with very little elasticity, that transmits the pull of a contracting muscle to the bone it moves; the Achilles tendon at the heel is the best known example.

The rounded head of the humerus sits in the socket of the shoulder blade and the head of the femur sits in the socket of the hip bone, which lets the limb move forwards, backwards, sideways and in rotation; these are synovial joints with a fluid-filled cavity.

All of them are attached behind to the thoracic vertebrae. In front, the first seven pairs join the sternum directly and are called true or vertebrosternal ribs; the next three pairs join the seventh rib through cartilage and are called false or vertebrochondral ribs; and the last two pairs have…

The adult column is counted as seven cervical vertebrae in the neck, twelve thoracic vertebrae bearing the ribs, five lumbar vertebrae in the lower back, one sacrum and one coccyx, giving twenty-six bones in all.

It is the innermost of the three ear ossicles of the middle ear and is shaped like a stirrup; it passes vibrations from the incus to the oval window of the inner ear and is the smallest bone of the body.

The adult skeleton has eighty bones in the axial part, that is the skull with the ear ossicles and hyoid, the vertebral column, the ribs and the sternum, and one hundred and twenty-six in the appendicular part, that is the limbs with the pectoral and pelvic girdles, making two hundred…

An adult set of thirty-two permanent teeth has eight incisors for cutting, four canines for tearing, eight premolars and twelve molars for grinding, so there is one canine on each side of each jaw.

It is a thin, strap-like muscle that runs across the front of the thigh from the hip bone to the inner side of the knee, and because it crosses two joints it is the longest muscle of the human body; it helps in bending the hip and the knee and…

Methanol (CH3OH) is called wood spirit or wood alcohol because it was first obtained by the destructive distillation of wood.

Violet light has the shortest wavelength among the visible colours, so the medium bends it the most. The splitting of white light into its colours is called dispersion.

Photosynthesis absorbs energy from sunlight to build glucose, so it is an endothermic process. An endothermic process takes in heat or light from its surroundings, while an exothermic one gives energy out.

The atomic number (Z) is defined as the number of protons in the nucleus of an atom. Every atom of an element has the same number of protons, so the atomic number identifies the element: hydrogen has 1, carbon 6 and oxygen 8.

X-rays are electromagnetic waves with no electric charge, so electric fields cannot deflect them. X-rays were discovered by Wilhelm Röntgen in 1895, who won the first Nobel Prize in Physics in 1901 for it.