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Science and Technology Basics 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.

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  1. Which of the following is an example of a chemical change?

    Answer: Burning of wood

    Burning of wood is a chemical change (combustion) because new substances (CO₂, water vapor, ash) are formed and the change is irreversible.

  2. The unit of electrical resistance is:

    Answer: Ohm

    The SI unit of electrical resistance is the Ohm (symbol: Ω), named after German physicist Georg Simon Ohm who formulated Ohm's Law.

  3. Which planet has the most moons in our solar system?

    Answer: Saturn

    Saturn has the most confirmed moons in our solar system, with 146 confirmed moons as of 2023, surpassing Jupiter's 95 moons.

  4. The process by which plants make food using sunlight is called:

    Answer: Photosynthesis

    Photosynthesis is the process by which green plants, algae, and some bacteria use sunlight, water, and CO₂ to produce glucose and oxygen.

  5. Which type of mirror is used in the headlights of vehicles?

    Answer: Concave mirror

    Concave (converging) mirrors are used in vehicle headlights. The light source is placed at the focal point, and the reflected beam comes out as a parallel, focused beam of light.

  6. What is the SI unit of frequency?

    Answer: Hertz

    The SI unit of frequency is the Hertz (Hz), named after physicist Heinrich Hertz. 1 Hz = 1 cycle per second.

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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
Science and Technology Basics Flashcards — RRB NTPC Study Cards with Answers