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CDS GK Questions 2026

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.

CDS GK Questions with Answers

Q2461.General ScienceAsked in: NDA · NDA-I 2019, GATEasy

Which one of the following is an organic acid?

  1. A.Hydrochloric acid
  2. B.Nitric acid
  3. C.Acetic acid
  4. D.Sulphuric acid
Show answer
Correct answer: C. Acetic acid

It is a carbon compound with a carboxyl group, so it is an organic acid. Acetic acid (ethanoic acid, CH₃COOH) contains the –COOH group typical of carboxylic acids.

Q2463.General ScienceAsked in: NDA · NDA-I 2021, GATMedium

Which one of the following statements about the cleansing action of soap is not true?

  1. A.The oil and dirt gets collected in the centre of the micelle.
  2. B.Soap micelles scatter light.
  3. C.Soaps are ammonium salts of long chain carboxylic acids.
  4. D.Soap forms insoluble precipitates with the calcium and magnesium ions in hard water.
Show answer
Correct answer: C. Soaps are ammonium salts of long chain carboxylic acids.

Soaps are sodium or potassium salts of long-chain carboxylic (fatty) acids, not ammonium salts. A soap molecule has a long hydrocarbon tail that mixes with oil and an ionic head that faces water.

Q2464.GeographyAsked in: NDA · NDA-II 2021, GATEasy

Which one of the following is not a feature of agriculture in India?

  1. A.Subsistence agriculture
  2. B.Pressure of population on agriculture
  3. C.Dependence upon Monsoon
  4. D.Predominance of cash crops
Show answer
Correct answer: D. Predominance of cash crops

Indian farming is dominated by food crops, not cash crops. Most of India’s cropped area is under food grains such as rice, wheat, millets and pulses, grown largely to feed the farm family and the country.

Q2467.General ScienceAsked in: NDA · NDA-II 2023, GATMedium

Which of the following statements are correct about the electrical resistance and resistivity of a wire? 1. Both quantities depend on the area of cross-section of the wire 2. Both depend on the temperature 3. Resistance of the wire is directly proportional to the resistivity of the wire 4. Resistivity of the wire is directly proportional to the length of the wire Select the correct answer using the code given below :

  1. A.1 and 2
  2. B.1 and 3
  3. C.2 and 3
  4. D.2 and 4
Show answer
Correct answer: C. 2 and 3

Both quantities change with temperature, and resistance is directly proportional to resistivity, while resistivity does not depend on the wire’s size.

Q2468.General ScienceAsked in: NDA · NDA-I 2024, GATHard

Which one of the following statements regarding simple pendulum is correct? Simple pendulum has a time period independent of amplitude :

  1. A.only for small amplitudes because then the net force on its bob is independent of its displacement.
  2. B.for any amplitude because the net force on the bob is always proportional to its displacement.
  3. C.for any amplitude because the net force on the bob is independent of its displacement.
  4. D.only for small amplitudes because then the net force on its bob is proportional to its displacement.
Show answer
Correct answer: D. only for small amplitudes because then the net force on its bob is proportional to its displacement.

The restoring force on the bob is mg sin θ. For small angles sin θ is almost equal to θ, so the force becomes proportional to the displacement and points back towards the mean position.

Q2469.General ScienceAsked in: NDA · NDA-II 2024, GATEasy

Which one among the following is correct for a person suffering from myopia?

  1. A.The person can see near objects clearly
  2. B.The person can see distant objects clearly
  3. C.The person cannot distinguish colours
  4. D.The person can neither see near objects nor distant objects clearly
Show answer
Correct answer: A. The person can see near objects clearly

Myopia is short-sightedness: near objects look sharp but distant ones look blurred. In a myopic eye the eyeball is too long or the eye lens is too curved, so light from a distant object comes to a focus in front of the retina instead of on it.

Q2471.Indian EconomyAsked in: NDA · NDA-II 2025, GATMedium

With which of the following was the Bretton Woods System NOT associated?

  1. A.International Monetary Fund
  2. B.Economic recovery after the Second World War
  3. C.International Bank for Reconstruction and Development
  4. D.Establishment of a monetary system based on floating exchange rate
Show answer
Correct answer: D. Establishment of a monetary system based on floating exchange rate

Bretton Woods set up fixed, not floating, exchange rates. At the Bretton Woods Conference in New Hampshire, USA, in July 1944, 44 Allied nations agreed on a new post-war money order.

Q2472.General ScienceAsked in: NDA · NDA-II 2026, GATMedium

Consider the following pairs : Chemical Reaction — Type of Chemical Reaction I. Fe(s) + CuSO₄(aq.) → FeSO₄(aq.) + Cu(s) — Displacement reaction II. Na₂SO₄(aq.) + BaCl₂(aq.) → BaSO₄(s) + 2NaCl(aq.) — Double displacement reaction III. Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g) — Redox reaction IV. 2KClO₃(s) → 2KCl(s) + 3O₂(g) — Thermal decomposition reaction How many of the pairs given above are correctly matched?

  1. A.One
  2. B.Two
  3. C.Three
  4. D.All four
Show answer
Correct answer: D. All four

Each reaction is labelled with its correct type, so every pair is matched correctly. In I, iron is more reactive than copper and pushes it out of copper sulphate, a displacement reaction.

Q2473.GeographyAsked in: CDS · CDS-II 2019, GKEasy

Which one of the following is not correct regarding South India ?

  1. A.Diurnal range of temperature is less
  2. B.Annual range of temperature is less
  3. C.Temperature is high throughout the year
  4. D.Extreme climatic conditions are found
Show answer
Correct answer: D. Extreme climatic conditions are found

South India has an equable, maritime climate, not an extreme one, because it lies close to the equator and is surrounded by the sea on three sides.

Q2475.Environment & EcologyAsked in: CDS · CDS-II 2020, GKMedium

Which one of the following statements with regard to ozone is not correct?

  1. A.Ozone is found mostly at 15-55 km in the atmosphere.
  2. B.Ozone is produced by gaseous chemical reactions.
  3. C.16th November is celebrated as the International Day for the Preservation of the Ozone Layer.
  4. D.Ozone is a form of oxygen in which three oxygen atoms are bounded together.
Show answer
Correct answer: C. 16th November is celebrated as the International Day for the Preservation of the Ozone Layer.

The International Day for the Preservation of the Ozone Layer is observed on 16 September, not 16 November. The date marks the signing of the Montreal Protocol on 16 September 1987, the treaty that phased out chlorofluorocarbons and other ozone-depleting substances.

Q2478.Indian EconomyAsked in: CDS · CDS-I 2022, GKMedium

Which one of the following statements with regard to the National Rural Employment Guarantee Act, 2005 is correct ?

  1. A.It ensures 175 days of employment to needy persons in rural areas.
  2. B.It gives higher wages to women workers.
  3. C.People are generally given both skilled and unskilled jobs.
  4. D.This is implemented only in rural areas of India.
Show answer
Correct answer: D. This is implemented only in rural areas of India.

As its name says, the Act guarantees work to households in rural areas; towns and cities are outside its scope.