Practice Test GeeksRRB NTPC Practice Test
← All RRB NTPC Flashcard Decks

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.

Read the first 6 Science and Technology Basics flashcards as text

  1. Which instrument is used to measure atmospheric pressure?

    Answer: Barometer

    A Barometer is used to measure atmospheric (air) pressure. It was invented by Evangelista Torricelli in 1643.

  2. The chemical formula of common salt (table salt) is:

    Answer: NaCl

    Common table salt is Sodium Chloride (NaCl), formed by the ionic bond between sodium (Na) and chlorine (Cl) atoms.

  3. The speed of light in vacuum is approximately:

    Answer: 3 × 10⁸ m/s

    The speed of light in vacuum (c) is approximately 3 × 10⁸ m/s (exactly 299,792,458 m/s). This is a fundamental constant of nature.

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

    Answer: Vitamin D

    Vitamin D (also called the 'sunshine vitamin') is synthesized in the skin when exposed to UVB rays from sunlight through a process involving 7-dehydrocholesterol.

  5. Newton's First Law of Motion is also known as the Law of:

    Answer: Inertia

    Newton's First Law of Motion is called the Law of Inertia: an object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.

  6. DNA stands for:

    Answer: Deoxyribonucleic Acid

    DNA stands for Deoxyribonucleic Acid. It is the hereditary material in all known organisms and most viruses.

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  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