CDS Previous Year GK Questions

A transformer heats up because of energy lost inside it: heat from current in the windings and hysteresis loss in the iron core.

Both statements are true, and the airborne spread of the TB bacterium is exactly why crowded places raise the risk.

A true fruit is a ripened ovary and nothing else. After fertilisation, the ovary of a flower develops into the fruit, its wall becomes the pericarp and the ovules inside become seeds.

In a free market, prices are set by buyers and sellers, not by the government. The price mechanism is how a market economy answers the basic questions of what to produce, how much and for whom.

The English physician showed in 1796 that deliberate inoculation could protect a person against smallpox. Jenner noticed that milkmaids who had caught the mild disease cowpox did not get smallpox.

The ryotwari system was meant to do the opposite: it bypassed the zamindars and dealt with the peasant directly. The ryotwari settlement was worked out by Alexander Read and Thomas Munro and introduced in the Madras Presidency in 1820, and later extended to the Bombay Presidency.

This statement is wrong, because the Gauhati High Court has permanent benches outside Guwahati. The Gauhati High Court at Guwahati is the common High Court for Assam, Nagaland, Mizoram and Arunachal Pradesh.

In Köppen's scheme it stands for a hot desert climate with its little rain in summer, which fits western Rajasthan.

The Alvars were devotees of Vishnu, not of the goddess Shakti, so this pair is wrong. The Bhakti movement began in Tamil Nadu between the sixth and ninth centuries with two groups of poet-saints.

Mission Shakti was India's first anti-satellite (ASAT) missile test. On 27 March 2019 DRDO fired a ground-launched interceptor from Dr. A.P.J.

By Archimedes' principle, the buoyant force equals the weight of the water displaced by the sphere. A fully immersed body displaces its own volume of water, here 2 × 10⁻⁴ m³.

Statement 4 is wrong because adhiyars and bargadars were both sharecroppers who worked the land of the jotedars. After the Permanent Settlement of 1793 by Lord Cornwallis, the Company tried to tame the zamindars: their troops were disbanded, their customs duties abolished and their courts placed under Company collectors.

Flash memory is erased electrically, not by ultraviolet light, so this is not one of its features. Flash memory is a type of EEPROM (electrically erasable programmable read-only memory) that can erase and rewrite whole blocks at a time, which makes it fast.

In national income accounting the steps run from private income to personal income to personal disposable income. Private income is the factor income of the private sector plus transfers.

Mitochondria carry their own small, circular DNA and their own ribosomes. Mitochondria are the powerhouses of the cell, where aerobic respiration makes ATP.

The United Nations marks 12 August every year as International Youth Day. The UN General Assembly endorsed the day in 1999, on the recommendation of the World Conference of Ministers Responsible for Youth held in Lisbon in 1998, and it was first observed in 2000.

. The American federation is called "an indestructible union of indestructible states", a phrase from the US Supreme Court's judgment in Texas v. White (1869).

The INA drew its soldiers largely from Indian prisoners of war held by Japan, and Bose created the Rani of Jhansi Regiment for women.

All three are underground modified stems: the potato is a stem tuber, and onion and garlic are bulbs. A stem can be told from a root by its nodes and buds.

A wave moves forward by one wavelength in each cycle, so 150 wavelengths take 150 cycles, and 150 cycles at 300 per second take half a second.