Static GK carries most of the 100 marks of the CDS General Knowledge paper. Of the 120 questions in the CDS (II) 2026 paper, about 20 were on Indian Polity, about 20 on the History of India, about 15 on Geography and the environment, about 10 on the Indian Economy and about 37 on Physics, Chemistry and Biology, which makes CDS the most science-heavy General Knowledge paper among the major recruitment exams. Polity questions test writs, the NHRC, electoral systems, disqualification of legislators, GST and delimitation. History runs from the Upanishads and the Shunga dynasty to Vijayanagara, temple architecture, the Sylhet referendum and the SNDP Yogam. Geography asks about the atmosphere, earthquakes and tsunamis, Ramsar sites, mangroves and World Heritage sites. Science stays at school level but expects reasoning: a lens problem, a magnetic field direction, molarity versus molality, what cooking soda is, how enzymes act. This page holds GK24's topic-wise GK notes for CDS, written as short facts and tables so that a topic can be revised in one sitting. Read a topic, then solve its previous-year questions and quiz on this site to check what stayed with you.
During respiration in human beings, the actual place of gaseous exchange is
The alveoli are tiny air sacs at the end of the smallest airways, and oxygen and carbon dioxide pass through their walls.
Read the full explanation →Which one of the following is an example of endothermic reaction?
Breaking calcium carbonate into quicklime and carbon dioxide needs a steady supply of heat, so the reaction absorbs energy. An endothermic reaction takes in heat from its surroundings, while an exothermic reaction gives heat out.
Read the full explanation →Which one of the following metals does not react with oxygen directly?
Platinum is a noble metal and does not combine with oxygen even when heated in air. Metals low in the reactivity series, such as gold and platinum, hold on to their electrons very firmly, so oxygen cannot pull them away under ordinary conditions.
Read the full explanation →Which among the following regarding the nature of goods and income elasticity are correctly matched? (Nature of Goods : Income Elasticity) 1. Necessity : Between 0 and 1 2. Luxury : More than 1 3. Inferior : More than 0 Select the answer using the code given below.
Necessities and luxuries are matched correctly, but an inferior good has a negative income elasticity, not a positive one. Income elasticity of demand is the percentage change in quantity demanded divided by the percentage change in income.
Read the full explanation →In which bag sizes will Bharat Rice be procured to ease handling at forward posts?
Procurement in these two bag sizes is meant to make the grain easier to lift, load and carry, which matters most where rations have to be taken to remote and difficult terrain such as Ladakh and the North East.
Read the full explanation →Which agency will supply Bharat Rice to the defence forces during the financial year 2026-27?
The correct answer is NAFED, the National Agricultural Cooperative Marketing Federation of India Limited, which will supply the rice during the financial year 2026-27 after it is milled to prescribed defence specifications and cleared by quality-control checks.
Read the full explanation →With which organisation did the Indian Army sign an MoU for the use of warehousing and material-handling resources during operational contingencies?
The MoU signed alongside the launch of Bharat Rice gives the Army a formal framework to use identified FCI warehouses, labour resources and material-handling equipment when operations require them, and it holds for five years with the option of extension by mutual consent.
Read the full explanation →Which one of the following acids is produced in human stomach?
The parietal (oxyntic) cells in the lining of the stomach secrete hydrochloric acid into the gastric juice. Hydrochloric acid makes the stomach strongly acidic, with a pH of roughly 1.5 to 3.5.
Read the full explanation →The percentage by which the money the borrower pays back exceeds the money that was borrowed is called as
The nominal interest rate is simply the percentage by which the amount repaid exceeds the amount borrowed, with no adjustment for inflation.
Read the full explanation →When copper reacts with moist carbon dioxide (CO2) in air, it forms a green coating of which one of the following compounds ?
Copper exposed to moist air slowly gains a green layer of basic copper carbonate, a form of cupric carbonate. Copper does not rust like iron, but it corrodes.
Read the full explanation →A boy completes one round of a circular track of diameter 200 m in 30 s. What will be the displacement at the end of 3 minutes and 45 seconds ?
After 3 minutes 45 seconds the boy has completed seven and a half rounds, so he stands at the point exactly opposite his starting point.
Read the full explanation →Which one of the following statements regarding bile secreted by liver is not correct?
Bile has no digestive enzymes at all; it only prepares fats for digestion by other enzymes. Bile is made by the liver, stored and concentrated in the gall bladder, and poured into the duodenum through the bile duct.
Read the full explanation →How much percentage of carbon dioxide is present in the atmosphere of Venus and Mars ?
Carbon dioxide makes up about 96.5% of the atmosphere of Venus and about 95% of the atmosphere of Mars. The two neighbours of the Earth have atmospheres dominated by carbon dioxide, with nitrogen and argon making up most of the rest.
Read the full explanation →Halophytes are the plants that grow on which one, among the following categories of soil ?
Halophytes are plants adapted to grow in soil or water with a high salt content. The word comes from the Greek 'halos', meaning salt.
Read the full explanation →Which of the following statements with reference to Surface inversion of temperature is/are correct ? 1. It causes instability in the lower layers of the atmosphere. 2. This inversion commonly lasts for a few hours until the Sun comes up. Select the answer using the code given below :
A surface inversion makes the lower air stable, not unstable, and it usually breaks up a few hours after sunrise.
Read the full explanation →Who among the following was India's first Woman Chief Minister ?
She became Chief Minister of Uttar Pradesh in October 1963, the first woman to head a state government in India.
Read the full explanation →Which one of the following is not a function of the pigment carotenoid ?
The reaction centre of a photosystem is a special chlorophyll a molecule, not a carotenoid. In photosynthesis, pigments are grouped into photosystems.
Read the full explanation →Which of the following statements about National Human Rights Commission, India is/are correct ? 1. It can intervene in court proceedings involving human rights violations with the approval of the court 2. It can undertake research in the field of human rights 3. It cannot investigate human rights violation on its own initiative Select the answer using the code given below :
The NHRC can join court cases on human rights with the court's approval and can promote research, but statement 3 is wrong because it can act on its own.
Read the full explanation →Which one of the following is most sensitive to environmental change?
Frogs, toads and salamanders react quickly to changes in water, air and temperature, which makes them the classic indicator animals.
Read the full explanation →The process of copying genetic information from one strand of DNA into RNA is termed as
Transcription is the step in which the genetic message of a gene is copied from one strand of DNA into a strand of RNA.
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