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CDS Previous Year GK Questions

Previous-year questions are the most reliable guide to the CDS General Knowledge paper, because the syllabus in the notice is one paragraph long and the paper is not. UPSC uploads the question papers of every CDS on upsc.gov.in the day after the exam, so a full record of what was asked exists for each cycle. Reading them shows the weight of each area, the depth UPSC expects in Polity, History, Geography, Economy and Science, and the question forms it prefers: statements with "which of the above are correct", "how many of the following pairs are correctly matched", match the lists, and arrange in chronological order. Many topics return: writs and constitutional bodies, dynasties and reform movements, Ramsar sites and World Heritage sites, budget and balance-of-payments terms, and school science applied to everyday situations. This page collects CDS previous-year General Knowledge questions in English and Hindi, each with the correct answer, an explanation and the topic it belongs to, so that a question leads you to the GK note that covers it. Use them in three passes: untimed to learn, timed to build speed, and a week later to revisit your wrong answers.

Previous Year Questions

Q403.General ScienceAsked in: CDS · CDS-I 2021, GKMedium

Which one among the following is a free living animal?

  1. A.Liver fluke
  2. B.Wuchereria
  3. C.Plasmodium
  4. D.Planaria
Show answer
Correct answer: D. Planaria

Planaria is a free-living flatworm, while the other three are parasites that live inside a host. Planaria belongs to the phylum Platyhelminthes and lives in freshwater ponds and streams, gliding under stones and feeding on small animals.

Q406.Indian EconomyAsked in: CDS · CDS-II 2024, GKHard

Which one of the following statements for a firm's equilibrium in Perfect Competition is not correct ?

  1. A.The market price must be greater or equal to average variable cost in the short run.
  2. B.The market price must be equal to marginal cost.
  3. C.The market price must be equal to average cost in the long run.
  4. D.The marginal cost decreases at the equilibrium output.
Show answer
Correct answer: D. The marginal cost decreases at the equilibrium output.

This statement is not correct, because at the equilibrium of a competitive firm marginal cost must be rising. A firm in perfect competition is a price taker, so the price it gets equals its marginal revenue.

Q407.Indian PolityAsked in: CDS · CDS-I 2025, GKMedium

Which one among the following statements about an adjournment motion in the Parliament of India is not correct ?

  1. A.Its objective is to draw attention of the House to any recent matter of urgent public importance.
  2. B.Adjournment motion is an extraordinary procedure.
  3. C.This motion can be invoked on any matter of urgent importance that may even be within the jurisdiction of a State Government.
  4. D.The Chair has absolute discretion to refuse consent.
Show answer
Correct answer: C. This motion can be invoked on any matter of urgent importance that may even be within the jurisdiction of a State Government.

The statement is not correct, because an adjournment motion can be moved only on a matter that primarily concerns the Union Government, not one within a State Government's jurisdiction.

Q408.General ScienceAsked in: CDS · CDS-II 2025, GKEasy

The linear momentum of a particle is conserved if:

  1. A.the net force on it is maximum.
  2. B.the net force on it is zero.
  3. C.the net torque on it is zero.
  4. D.the net work done on it is maximum.
Show answer
Correct answer: B. the net force on it is zero.

Linear momentum stays constant only when no net external force acts. Linear momentum is the product of mass and velocity, p = mv.

Q409.GeographyAsked in: CDS · CDS-II 2016, GKMedium

Which one of the following statements is not correct?

  1. A.Position of the Sun, Earth and Moon in a straight line of 180° angle is known as syzygy.
  2. B.Syzygy conjunction causes solar eclipse.
  3. C.Syzygy opposition causes lunar eclipse.
  4. D.Syzygy conjunction occurs at the time of perihelion only.
Show answer
Correct answer: D. Syzygy conjunction occurs at the time of perihelion only.

This statement is not correct, because conjunction happens at every new moon, about once a month, and has nothing to do with the Earth's closest point to the Sun.

Q410.GeographyAsked in: CDS · CDS-I 2017, GKMedium

Which one of the following about sugar industry of Peninsular India is not correct?

  1. A.High yield per hectare of sugarcane
  2. B.Higher sucrose content
  3. C.Long crushing season
  4. D.Most of the mills in the Peninsula are located mainly along the east coast
Show answer
Correct answer: D. Most of the mills in the Peninsula are located mainly along the east coast

This statement is not correct, because the peninsular sugar mills are concentrated mainly in Maharashtra and Karnataka, in the west and the interior of the plateau.

Q411.Awards & HonoursAsked in: CDS · CDS-II 2017, GKMedium

The Nobel Prize in Physics for the year 2016 was given to

  1. A.David J. Thouless
  2. B.F. Duncan M. Haldane
  3. C.J. Michael Kosterlitz
  4. D.All of them
Show answer
Correct answer: D. All of them

The 2016 Nobel Prize in Physics was shared by David J. Thouless, F. Duncan M. Haldane and J. Michael Kosterlitz, three British-born physicists working in the United States.

Q412.General ScienceAsked in: CDS · CDS-I 2018, GKMedium

Which of the following classes of animals has/have three-chambered heart?

  1. A.Pisces and Amphibia
  2. B.Amphibia and Reptilia
  3. C.Reptilia only
  4. D.Amphibia only
Show answer
Correct answer: B. Amphibia and Reptilia

Amphibians and most reptiles have a heart with three chambers: two atria and one ventricle. In frogs and toads, oxygen-rich blood from the lungs and oxygen-poor blood from the body both reach the single ventricle, so some mixing takes place.

Q414.Static GKAsked in: CDS · CDS-I 2020, GKEasy

Hilsa is the national fish of

  1. A.Pakistan
  2. B.India
  3. C.Bangladesh
  4. D.Nepal
Show answer
Correct answer: C. Bangladesh

The hilsa, called ilish in Bengali, is the national fish of Bangladesh. It is a fish of the herring family that lives in the sea and swims up rivers to breed, a habit called anadromous migration.

Q415.General ScienceAsked in: CDS · CDS-II 2020, GKEasy

Pearls are harvested from

  1. A.Prawn
  2. B.Pila
  3. C.Tuna
  4. D.Oyster
Show answer
Correct answer: D. Oyster

Pearls are harvested from pearl oysters, which are bivalve molluscs. When a foreign particle, such as a grain of sand or a parasite, gets inside the shell, the oyster's mantle covers it layer after layer with nacre, the shiny material also called mother of pearl.

Q416.General ScienceAsked in: CDS · CDS-I 2021, GKMedium

Which one of the following laws of electromagnetism does not give the direction of magnetic field ?

  1. A.Right-hand thumb rule
  2. B.Fleming's left-hand rule
  3. C.Fleming's right-hand rule
  4. D.Faraday's law of electromagnetic induction
Show answer
Correct answer: D. Faraday's law of electromagnetic induction

Faraday's law is a law of magnitude, not a direction rule. It states that the emf induced in a circuit is proportional to the rate at which the magnetic flux through it changes.

Q418.Science & TechnologyAsked in: CDS · CDS-I 2022, GKHard

To study which one of the following was a spacecraft launched that would be farthest from the Sun and would run exclusively on solar power ?

  1. A.Jupiter's Trojan asteroids
  2. B.Saturn's rings and moons
  3. C.Mars' atmosphere
  4. D.Kuiper Belt and Oort Cloud
Show answer
Correct answer: A. Jupiter's Trojan asteroids

NASA's Lucy mission, launched in October 2021, is the solar-powered spacecraft that travels farthest from the Sun to study the Trojan asteroids.

Q419.GeographyAsked in: CDS · CDS-I 2023, GKMedium

Which of the following statements is/are correct?

1. Visakhapatnam Port is a land-locked harbour.

2. Deendayal Port is a tidal port.

Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 only
  3. C.Both 1 and 2
  4. D.Neither 1 nor 2
Show answer
Correct answer: C. Both 1 and 2

Both statements describe the two ports correctly. Visakhapatnam in Andhra Pradesh is India's deepest land-locked and protected port on the east coast.

Q420.Indian PolityAsked in: CDS · CDS-I 2025, GKHard

Which of the following descriptions with regard to Parliamentary Privilege for Members of the Parliament of India is/are correct ?

1. The Speaker is empowered to refer suo moto any question of privilege for investigation

2. A question of privilege is accorded priority over other items in the List of Business

3. The privilege extends to freedom from preventive arrest or detention

Select the answer using the code given below :

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

Statements 1 and 2 describe the Lok Sabha's privilege procedure correctly, while statement 3 overstates the freedom from arrest. Under the Rules of Procedure of the Lok Sabha, the Speaker may refer any question of privilege to the Committee of Privileges on his own, without a motion from a member.

All Defence previous year questions