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NDA 2025 Previous Year GK Questions with Answers

GK questions asked in NDA 2025, with answers and explanations.

Previous Year Questions

Q21.General ScienceAsked in: NDA · NDA-II 2025, GATEasy

The rule to determine the direction of a force experienced by a straight current carrying conductor placed in a magnetic field which is perpendicular to it is

  1. A.Right-hand thumb rule
  2. B.Fleming's left-hand rule
  3. C.Fleming's right-hand rule
  4. D.Hund's rule
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Correct answer: B. Fleming's left-hand rule

It gives the direction of the force on a current-carrying conductor placed in a magnetic field. Stretch the thumb, forefinger and middle finger of the left hand so that they are mutually perpendicular.

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Q22.Indian HistoryAsked in: NDA · NDA-I 2025, GATMedium

Which of the following main industry/ industries was/were developed in the second industrial revolution that took place after about 1850?

  1. A.Coal and iron
  2. B.Cotton spinning and weaving
  3. C.Chemical and electrical
  4. D.Steam engines
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Correct answer: C. Chemical and electrical

The second industrial revolution, from about 1850 to 1914, was driven by steel, chemicals, electricity and oil. The first industrial revolution began in Britain around 1760 and rested on cotton textiles, coal, iron and the steam engine.

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All Defence previous year questions