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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. Which force keeps planets in orbit around the Sun?

    Answer: Gravitational force

    Gravity is the force that keeps planets in orbit by constantly pulling them toward the Sun.

  2. The pH value of pure water is:

    Answer: 7

    Pure water is neutral with a pH of exactly 7 at 25°C.

  3. Which blood group is called the universal donor?

    Answer: O-

    O negative (O−) blood can be given to anyone regardless of blood type, making it the universal donor.

  4. The process by which a solid directly converts to gas is called:

    Answer: Sublimation

    Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.

  5. Which part of the eye controls the amount of light entering it?

    Answer: Iris

    The iris controls the size of the pupil, thereby regulating the amount of light entering the eye.

  6. Ohm's Law states that voltage (V) equals:

    Answer: Current × Resistance

    Ohm's Law states V = I × R, where V is voltage, I is current, and R is resistance.

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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