CDS GK Questions 2026

The stinging hairs on nettle leaves break on touch and inject methanoic acid, also called formic acid, into the skin, which causes the burning pain.

Outside a long straight wire the field is B = μ₀I/(2πr), so at a fixed distance r it is directly proportional to the current I. Hans Christian Oersted found in 1820 that a current deflects a compass needle, showing that a current produces a magnetic field.

Magnesium does not react with cold water; it reacts with hot water and burns in steam to form magnesium oxide and hydrogen.

With constant acceleration the distance covered is s = ut + ½at², and the first term contains the initial velocity u. This is the second equation of motion.

Denmark is known as the country of winds because strong westerly winds blow across its flat land and long North Sea coast for most of the year.

This is absolute zero, more exactly −273.15°C or 0 kelvin, the temperature below which nothing can be cooled. Temperature measures the random motion of particles.

This is the order of the layers of the atmosphere from the ground upwards, with the exosphere above them all.

One hertz means one complete cycle per second, so a frequency of 3 Hz means the current completes three full cycles every second.

Pitch is how the ear perceives the frequency of a sound, so a higher pitch means more vibrations per second.

Streptococcus mutans turns dietary sugar, especially sucrose, into a sticky slime that glues it to the teeth. The bacterium makes enzymes called glucosyltransferases that join the glucose units of sucrose into sticky chains called glucans.

These three oxides, made by heating limestone with clay, form the compounds that make cement set and harden. Portland cement was patented by Joseph Aspdin in England in 1824, and named after Portland stone, which the set cement resembled.

The weight we feel is really the push of the floor on us, and in orbit that push disappears. The space station and the astronaut are both in free fall around the Earth.

In 1611 the English East India Company opened its first factory on the east coast at Masulipatam, the chief port of the Golconda kingdom.

A thermocouple has no liquid that can freeze, so suitable types can read temperatures far below −200°C. A thermocouple is made of two wires of different metals joined at a junction.

Kepler's third law says the square of a planet's orbital period is proportional to the cube of the semimajor axis of its orbit.

The Act lists energy-intensive sectors in a schedule, and units in them above a notified threshold of annual energy consumption become designated consumers; each must appoint or designate an energy manager, have an energy audit carried out at prescribed intervals, keep records of energy consumed and comply with the consumption…

The 2022 amendment to the Energy Conservation Act empowered the Central Government to specify a carbon credit trading scheme, to prescribe a minimum share of non-fossil energy for designated consumers, and to extend the building code to large residential buildings.

The code was drawn up by the Bureau of Energy Efficiency for new commercial buildings with a connected load of 100 kW or more, or a contract demand of 120 kVA or more, and it prescribes requirements for the building envelope, lighting, air conditioning, water heating and electrical systems.

PAT gives each designated consumer a target to reduce its specific energy consumption over a cycle; a plant that overshoots the target earns ESCerts and may sell them on the power exchanges to a plant that has fallen short, which turns efficiency into a tradable commodity.

The Ministry of Power observes National Energy Conservation Day on this date every year, and the national energy conservation awards are given to industries, buildings and institutions that have cut their energy use.