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250 words
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7 July 2026

Science quiz

The content provides fundamental scientific principles and historical medical facts that serve as useful background context for GS3 science and technology questions, though it lacks the specific policy or current affairs focus required for a higher rating.

2 min read 2 questions 3 prelims

Notes

  • Haber process: Nitrogen and hydrogen combine to form ammonia while ammonia simultaneously decomposes; equilibrium is reached when forward and reverse reaction rates are identical.
  • Laser technology: Operates by maintaining a population inversion where more atoms are in an excited state than a relaxed state, releasing energy as they return to lower states.
  • Blood pH regulation: Carbon dioxide, carbonic acid, bicarbonate ions, and hydrogen ions exist in a continuous equilibrium to maintain stable blood pH despite metabolic changes.
  • Hydrostatic equilibrium: Stars maintain structural stability through the balance between inward gravitational pull and outward pressure from internal nuclear fusion and energy transport.
  • Nitrogen cycle: Nitrogen moves through atmosphere, soil, and organisms via fixation, nitrification, assimilation, ammonification, and denitrification, maintaining constant reservoir sizes over time.
  • Historical medical facts: Syphilis is caused by Treponema pallidum; Mycobacterium leprae was the first bacterium identified as a human disease cause; Vibrio cholerae has caused seven pandemics since the 19th century; HIV is characterized by rapid genetic mutation.

Questions

  1. Explain the concept of dynamic equilibrium in biological and physical systems, citing examples such as blood pH regulation and hydrostatic equilibrium in stars. 150 words
    Attempt this — 150 words in 8 min
    0 / 150 words 8:00
  2. Discuss the significance of the nitrogen cycle in maintaining global ecological balance and explain the chemical processes involved in the transformation of nitrogen across different environmental reservoirs. 250 words
    Attempt this — 250 words in 11 min
    0 / 250 words 11:00

Prelims

  1. Which of the following processes is essential for maintaining the structural stability of a star during its main sequence lifetime?

  2. What is the primary mechanism that allows a laser to function by ensuring more atoms are in an excited state than a relaxed state?

  3. Which bacterium was the first to be identified as the causative agent of a human disease?

Syllabus

Topics

Sources

250words.in · https://250words.in/daily/2026-07-07/science-quiz