UPSC CAPF GK Questions 2026

A guard tube is filled with anhydrous calcium chloride, which absorbs moisture and keeps the hydrogen chloride gas dry. In the school experiment, hydrogen chloride gas is made by heating sodium chloride with concentrated sulphuric acid, and the gas is passed through a guard tube containing calcium chloride.

The gastric glands in the stomach wall secrete hydrochloric acid, the only mineral (inorganic) acid among the options. Hydrochloric acid (HCl) makes the stomach strongly acidic, with a pH of about 1.5 to 3.5.

Pitch is the way our ear senses the frequency of a sound: the higher the frequency, the higher the pitch.

Institutional training, overseas employment and leveraging of public infrastructure are all sub-missions of the National Skill Development Mission.

When houses are built all around a lake or tank, the village grows in a ring around the water, giving a circular pattern.

The Office of the United Nations High Commissioner for Refugees won the Nobel Peace Prize in 1954 and again in 1981.

A rainbow forms only because sunlight is refracted, dispersed and internally reflected inside raindrops. When sunlight enters a water droplet it is refracted and split into its colours (dispersion), because each colour bends by a different amount.

Both a plane mirror and a convex mirror always form an erect, virtual image, whatever the distance of the object.

Iron is a transition (d-block) element, and such elements can show more than one oxidation state. In transition metals the energies of the outer s electrons and the inner d electrons are very close, so atoms can lose different numbers of electrons.

Helium is a noble gas whose atoms exist singly, so it is a monatomic gas, not a diatomic one. Helium has a completely filled first shell (1s²), so its atoms have no tendency to share electrons or bond with each other.

Agriculture uses natural resources directly, and services are the tertiary sector. Economic activities are grouped into three main sectors.

Quartz is silicon dioxide (SiO 2 ), so it contains silicon and oxygen. Quartz is one of the most common minerals in the Earth's crust and the main part of sand.

At full employment the measured unemployment rate is not negative; it stays at a small positive level called the natural rate of unemployment.

Craft centres are recognised by raw material and by the leftovers of making things. Archaeologists studying Harappan sites look for raw materials such as stone nodules, whole shells and copper ore, for tools, and for unfinished objects, rejects and waste.

CEDAW grew out of the Commission on the Status of Women and addresses reproductive rights, but it has its own monitoring committee.

The Periyar rises in the Western Ghats of Kerala and flows west into the Arabian Sea. The Periyar is the longest river of Kerala.

Root hairs are thin outgrowths of the root's epidermal cells that greatly increase the area for absorbing water and minerals.

'Indian Unrest' (1910) was written by the British journalist Valentine Chirol, not by Annie Besant. Chirol, a writer for The Times, collected his articles on the rise of Indian nationalism into this book and called Bal Gangadhar Tilak the 'father of Indian unrest'.

The Supreme Court has counted all three among the basic features that Parliament cannot destroy. The basic structure doctrine was laid down in Kesavananda Bharati (1973): Parliament can amend any part of the Constitution under Article 368 but cannot alter its basic structure.

Marco Polo did describe the pearl fishery of the Tuticorin coast, so the statement that he did not is wrong.