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Defence GK Questions 2026

Static GK carries most of the General Knowledge marks in the defence exams, and science carries the largest share of it. In NDA & NA, Physics, Chemistry and General Science are about half of the 400 marks of Part B, and History, the freedom movement and Geography are about 20% each, as per the notice. In the CDS (II) 2026 General Knowledge paper, GK24 counted about 37 science questions, about 20 each on Polity and History, about 15 on Geography and environment and about 10 on the Economy; this count is guidance, not an official break-up. The Army's Agniveer CEE gives 15 of its 50 General Duty questions to General Knowledge and 15 to General Science, which covers cells, the human body, plants and animals and common epidemics. Its GK list names history, culture and geography of India and its neighbours, the Constitution, inventions and discoveries, books and authors, and the Indian Armed Forces. This page holds GK24's topic-wise GK notes and GK questions tagged for NDA, CDS and Agniveer, in English and Hindi: General Science, Indian History, Art and Culture, Indian Polity, Geography, Indian Economy and Static GK. Read one topic at a sitting, then solve its questions and the previous-year questions of your exam to see what stayed with you.

Defence GK Questions with Answers

Q2981.General ScienceAsked in: NDA · NDA-II 2017, GATMedium

An object moves in a circular path with a constant speed. Which one of the following statements is correct ?

  1. A.The centripetal acceleration of the object is smaller for a gentle curve (i.e., curve of larger radius) than that for a sharp curve (i.e., curve of smaller radius).
  2. B.The centripetal acceleration is greater for a gentle curve than that for a sharp curve.
  3. C.The centripetal acceleration is the same for both, the gentle and sharp curves.
  4. D.The centripetal acceleration causes the object to slow down.
Show answer
Correct answer: A. The centripetal acceleration of the object is smaller for a gentle curve (i.e., curve of larger radius) than that for a sharp curve (i.e., curve of smaller radius).

At a fixed speed v, centripetal acceleration equals v²/r, so a larger radius gives a smaller acceleration. An object moving in a circle at constant speed is still accelerating, because its direction keeps changing.

Q2982.General ScienceAsked in: NDA · NDA-II 2018, GATEasy

Which one of the following depicts the correct circuit of a reflex arc?

  1. A.Effector—sensory neuron—spinal cord—motor neuron—receptor
  2. B.Receptor—sensory neuron—spinal cord—motor neuron—effector
  3. C.Receptor—sensory neuron—brain—motor neuron—effector
  4. D.Sensory neuron—receptor—brain—effector—motor neuron
Show answer
Correct answer: B. Receptor—sensory neuron—spinal cord—motor neuron—effector

In a reflex arc the message runs from the sense organ to the spinal cord and straight back to a muscle or gland.

Q2983.General ScienceAsked in: NDA · NDA-I 2019, GATEasy

Basic scientific principle behind a nuclear reactor is

  1. A.Nuclear fusion
  2. B.Controlled nuclear fusion
  3. C.Uncontrolled nuclear fission
  4. D.Controlled nuclear fission
Show answer
Correct answer: D. Controlled nuclear fission

A nuclear reactor splits heavy nuclei such as uranium-235 in a chain reaction that is kept under control, releasing heat at a steady rate.

Q2984.General ScienceAsked in: NDA · NDA-II 2019, GATMedium

Mitochondria are able to produce their own

  1. A.Nucleus
  2. B.Proteins
  3. C.Chloroplasts
  4. D.Digestive enzymes
Show answer
Correct answer: B. Proteins

Mitochondria have their own DNA and their own ribosomes, so they can make some of the proteins they need. Mitochondria are the "powerhouses of the cell", where food is broken down in aerobic respiration to release energy stored as ATP.

Q2989.General ScienceAsked in: NDA · NDA-II 2023, GATEasy

Ms. Rani decides to convert her AC generator into a DC generator. Which one of the following she would need to use ?

  1. A.A split-ring type commutator
  2. B.Slip rings and brushes
  3. C.A stronger magnetic field
  4. D.A rectangular wire loop
Show answer
Correct answer: A. A split-ring type commutator

A split-ring commutator reverses the coil's connection to the outer circuit every half turn, so the current outside flows in one direction only.

Q2992.Indian HistoryAsked in: NDA · NDA-II 2025, GATMedium

In the Harappan Civilization, traces of canals have been found at

  1. A.Banawali
  2. B.Lothal
  3. C.Shortughai
  4. D.Dholavira
Show answer
Correct answer: C. Shortughai

Shortughai, a Harappan trading settlement in north-eastern Afghanistan, is the site where traces of irrigation canals have been found. Most Harappan farmers relied on river floods and wells, and no canals have been found in the Indus heartland.

Q2993.General ScienceAsked in: NDA · NDA-II 2026, GATMedium

Consider the following statements : I. A solution of iodine in ethanol known as 'tincture of iodine' is a heterogeneous mixture. II. A suspension is a heterogeneous mixture and its particles scatter a beam of light passing through it, making its path visible. III. A colloidal solution, although it appears homogeneous, is a heterogeneous mixture. Which of the statements given above are correct ?

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

Tincture of iodine is a true solution, which is homogeneous, so statement I is wrong, while II and III are right.

Q2997.GeographyAsked in: UPSC CAPF · CAPF 2019, Paper IMedium

Doldrum are

1. equatorial calms

2. calm and light winds

3. roaring forties

4. variable both in position and in extent

Select the correct answer using the code given below:

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

The doldrums are the equatorial belt of calm and light, variable winds, and the belt shifts with the seasons; they have nothing to do with the roaring forties.

Q3000.Indian EconomyAsked in: UPSC CAPF · CAPF 2024, Paper IHard

Consider the following statements:

1. Burden of a tax on a commodity is independent of who (buyer or seller) it is explicitly imposed upon

2. Burden of a tax on a commodity depends on the slope of the demand and supply curves

Which of the statements given above is/are correct?

  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

Who finally bears a tax (its incidence) is decided by the market, through the elasticities of demand and supply, not by the law that says who must pay it.

GK Questions for sub-exams