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General Science MCQ Practice
Practice General Science questions with instant scoring, correct answer highlighting, detailed solutions and first-click AI explanation caching for missing explanations.
📚 Questions: 553
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Q. 1685
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What is Air Quality Index ?
Answer Explanation
- Correct option: C - Air Quality Index measures levels of ozone (O3) among pollutants in the selected area to assess air quality.
- Key concept: AQI combines pollutant concentrations into a single scale to indicate health risk from pollutants including ground-level ozone.
- Why others are incorrect:
- Option A: Not about sound pollution.
- Option B: It does not focus only on sulphur; it covers multiple pollutants.
- Option D: It does not assess colour of air.
- Tip for exam: Remember AQI = function of concentrations f(pollutants) mapped to a standard scale.
Q. 1684
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Who among the following is considered as the father of artificial intelligence ?
Correct answer: John McCarthy
- Reason: John McCarthy coined the term "artificial intelligence" and organized the 1956 Dartmouth Conference, the birth of AI as a field.
- Key concept: Founder of AI as a discipline; laid foundations for AI programming and research directions.
- Why others are incorrect:
- Charles Babbage – conceived the Analytical Engine, early computing but not AI father.
- Lee De Forest – invented the vacuum tube; radio tech, not AI.
- J. P. Eckert – co-created ENIAC, early computing, not AI leader.
- Exam tip: Remember: “McCarthy = AI origin” is a common fact-based association in exams.
Q. 1683
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Which of the following is the first calculating device ?
Answer: A
- Explanation: The abacus is the earliest known calculating device, used in ancient times for basic arithmetic by sliding beads on rods. It embodies the fundamental concept of performing operations mechanically, which later devices built upon.
- Key concept: Mechanical counting using a surrogate for arithmetic operations before electronic calculators.
- Why others are incorrect:
- Pascaline (17th century) came after the abacus.
- Calculator (modern electronic) is a recent invention.
- Turing machine is a theoretical model, not a physical calculating device.
- Exam tip: Remember sequence: abacus > Pascaline > modern calculators > theoretical models like Turing machine.
Q. 1682
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According to ISRO, Chandrayaan-2 moon mission will explore which area of the moon ?
Correct answer: B Moon South Pole
- Why correct: ISRO’s Chandrayaan-2 mission targets the Moon’s South Pole to study permanently shadowed craters that may contain water ice and other volatiles.
- Key concept: Lunar polar regions have extreme, stable cold traps and near-continuous sunlight angles, affecting geology and resources.
- If any formula/numerical logic is needed: Not required here; concept is based on location and resources, not arithmetic.
Q. 1610
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Sericuluture is a rearing practice of :
Explanation:
- Correct option: B - Sericulture is the rearing of silk worms to produce silk cocoons.
- Key concept: Silk worm farming involves cultivating Bombyx mori and harvesting silk from cocoons.
- Why others are incorrect: Fishes, honey bees, and earthworms are not associated with silk production.
- Note: No complex formula; focuses on life cycle of silkworms (egg → larva → pupa → moth).
Q. 1606
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Which gas is used as fire extinguisher?
Correct answer: C) Carbon dioxide
- CO2 is used as a fire extinguisher because it is denser than air and displaces oxygen, suffocating the flame without supporting combustion.
- Key concept: oxygen displacement reduces available O2, stopping the chemical reaction in fire.
- Formula/logic: extinguish by reducing O2 concentration around the fire (O2 deprivation).
- Exam tip: Suitable for electrical fires and small fires; avoid in confined spaces where people may suffocate.
- Why others are incorrect: A) nitrogen dioxide is toxic; B) carbon monoxide is toxic and flammable; D) nitrous oxide is not an extinguishing agent.
Q. 1579
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Isaac Newton invented:
Answer: B. Reflecting Telescope
- Newton built the first practical reflecting telescope using a concave mirror, reducing chromatic aberration that plagues refracting designs.
- Key concept: using a mirror instead of a lens to gather and focus light.
- Formula/note: focal length relates to mirror curvature; the Newtonian design places the eyepiece on the side for convenient viewing.
- Exam tip: remember Newton’s telescope = reflecting type; others belong to different inventors (thermometers, transistors, hydraulic devices).
- Why others are incorrect: A (thermometer) not Newton’s invention; C (hydraulic accumulator) and D (transistor) are from other periods/inventors.
Q. 1577
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Blood Circulation was discovered by?
William Harvey an English physician discovered the principle of the circulation of the blood through the body.
Q. 1575
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The pale yellow colour of urine is due to the presence of which pigment?
Correct answer: B. Urochrome
- The pale yellow color of urine is due to urochrome, a pigment formed from the breakdown of bilirubin and processed in the kidneys.
- Key concept: urinary pigment urochrome determines normal urine color; its concentration causes light to dark shades.
- Formula/note: urochrome presence ≈ relate to bilirubin metabolism and urobilin production (no complex math needed).
- Exam tip: If urine is unusually dark, consider hydration status and possible elevated urochrome concentration.
- Why others are incorrect: Urophyll, chlorophyll, and chloroplast are plant-related pigments, not urinary pigments.
Q. 1573
👁 2 views
Human beings hearing range is:
Correct answer: C
- Reason: Humans hear frequencies roughly from 20 Hz to 20,000 Hz (20 Hz to 20 kHz). This is the typical audible range for a young healthy ear; it narrows with age or noise exposure.
- Key concept: Audible range = frequency range (Hz) of sound waves that can be perceived by the human ear.
- Why others are incorrect: A, B, and D show ranges outside the standard 20–20,000 Hz for normal hearing.
- Exam tip: Remember 20 Hz (low bass) to 20 kHz (high treble) as the common benchmark.
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