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General Science Flashcards

6 cards from real RRB NTPC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 General Science flashcards as text

  1. The chemical formula of water is:

    Answer: H2O

    Water is composed of two hydrogen atoms and one oxygen atom, giving the formula H₂O.

  2. Which organ in the human body produces insulin?

    Answer: Pancreas

    Insulin is produced by the beta cells of the pancreas to regulate blood sugar levels.

  3. The unit of electric current is:

    Answer: Ampere

    Electric current is measured in Amperes (A), named after André-Marie Ampère.

  4. Which gas is most abundant in Earth's atmosphere?

    Answer: Nitrogen

    Nitrogen makes up about 78% of Earth's atmosphere, making it the most abundant gas.

  5. The speed of light in a vacuum is approximately:

    Answer: 3 × 10⁸ m/s

    The speed of light in a vacuum is approximately 3 × 10⁸ metres per second (300,000 km/s).

  6. Which vitamin is produced by the human body when exposed to sunlight?

    Answer: Vitamin D

    The skin synthesizes Vitamin D when exposed to ultraviolet (UV) rays from sunlight.

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Sources & references

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  1. pib.gov.in — Eligibility, registration deadline · verified Oct 2026
  2. rrb.indianrailways.gov.in — Test delivery, fees, exam format, passing score, time limit · verified Oct 2026
  3. rrbapply.gov.in — Registration deadline · verified Oct 2026