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NDA General Knowledge — practice by topic

Browse 49 questions across 7 General Knowledge topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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General Knowledge topics

General Knowledge (45)Ancient Indian History (1)Defence & Modern India (1)Indian History (1)Medieval Indian History (1)Science GK (1)Science Rapid-fire (1)

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The Greek word *atomos*, from which *atom* is derived, means:Read the answer and worked solution →According to Dalton's atomic theory (1808):Read the answer and worked solution →Who discovered the **electron** and in which year?Read the answer and worked solution →In a cathode ray tube, the rays move from:Read the answer and worked solution →

Worked practice questions

The Greek word *atomos*, from which *atom* is derived, means:

  1. very small
  2. flowing
  3. heavy
  4. indivisible
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Correct answer: D. indivisible

*Atomos* in Greek means *indivisible*. Leucippus and Democritus called the smallest particles by this name.

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According to Dalton's atomic theory (1808):

  1. Matter is continuous and infinitely divisible.
  2. Atoms contain electrons orbiting a nucleus.
  3. All matter is composed of indivisible particles called atoms.
  4. Atoms are made entirely of energy.
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Correct answer: C. All matter is composed of indivisible particles called atoms.

Dalton proposed that all matter is composed of indivisible particles called atoms — the first scientific atomic theory.

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Who discovered the **electron** and in which year?

  1. Rutherford in 1911
  2. J. J. Thomson in 1897
  3. Dalton in 1808
  4. Bohr in 1913
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Correct answer: B. J. J. Thomson in 1897

J. J. Thomson discovered the electron in 1897 by studying cathode rays.

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How to practise

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