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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.
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Q. 2016
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What chemicals are used in fire extinguishers used in houses and offices ?
- Correct answer: A β Water, potassium bicarbonate and fluorocarbon are common extinguishing agents used in household/office extinguishers.
- Key concept: Fire extinguishers contain agents that interrupt the fire triangle by cooling (water), smothering/chemical action (potassium bicarbonate), or reducing flame chemistry (fluorocarbon).
- Why correct: Water cools the fire; potassium bicarbonate chemically interrupts flameing reactions; fluorocarbons displace oxygen and interrupt the combustion process.
- Tip: In electrical fires, avoid water; use appropriate dry chemical or CO2 extinguishers.
Q. 2015
π 1 views
In which direction a rainbow is formed ?
Correct option: C
- Reason: A rainbow is formed when sunlight is refracted, reflected inside raindrops, and refracted again. The scattered rays reach the observer from drops opposite to the Sun, creating the arc opposite to the Sun.
- Key concept: Primary rainbow diameter and position are fixed relative to the Sun; you see the rainbow opposite the Sun.
- Formula/logic (brief): Sunlight enters raindrops and undergoes two refractions with one internal reflection; observer sees rays at ~42Β° angle from the anti-solar direction.
- Exam tip: If you see a rainbow, the Sun is behind you and the arc is in front of you, opposite the Sun.
- Why others are incorrect: A, B, D place the rainbow relative to the Sun incorrectly; the rainbow forms opposite, not above, below, or at Sun level.
Q. 2014
π 2 views
Which of the following statements is correct ?
Correct answer: D
- Why: In many electrical systems, red is used for live, black for neutral, and green for earth/ground. Hence all three statements are correct.
- Key concept: Color coding of electrical wiring helps identify functions and ensure safety.
- Tip: If you see green or green-yellow insulation, treat it as earth/ground.
- Why others are incorrect: A and B label red as live and black as neutral; C separately identifies green as earthing. Together they make all statements true, so option D is correct.
Q. 2013
π 1 views
What is common in AIDS, hepatitis and typhoid fever ?
Correct option: D
- Reason: AIDS, hepatitis, and typhoid fever are transmitted mainly through human actions and contact (blood, sexual contact, contaminated food/waces, fecal-oral routes), not solely by their agentsβ nature.
- Key concept: Human-mediated transmission. While AIDS and hepatitis can be viral, typhoid is bacterial; what links them isδΌ ζ by people, not by water, air, or non-human reservoirs alone.
- Why others are incorrect:
- A: Not all are bacterial (AIDS and viral hepatitis).
- B: Typhoid is waterborne; AIDS/viral hepatitis have other routes.
- C: Not all are viral (typhoid is bacterial).
Q. 2012
π 1 views
Cause of global warming is:
Answer: B
- Reason: Global warming is caused by enhanced greenhouse effect due to higher COβ trapping heat in the atmosphere.
- Key concept: Greenhouse gases (COβ, CH4, N2O) trap infrared radiation, raising surface temperature.
- Simple formula idea: Net warming β increase in greenhouse gas concentration Γ heat-trapping efficiency.
Q. 2011
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The gas which destroys ozone layer is:
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Q. 2010
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Marijuana, a psychoactive drug is obtained from:
Explanation
- The correct answer is C: female inflorescence of cannabis.
- Marijuana is obtained from the flowering tops of female cannabis plants, which contain high levels of the psychoactive compound THC.
- Key concept: psychoactive compounds accumulate mainly in the female reproductive flowers, not in male flowers or seeds.
- Why others are incorrect: A) seeds of poppy β from opium poppy, not cannabis. B) capsules of poppy β part of opium production. D) male inflorescence β has little or no THC.
- Exam tip: remember βmarijuana = female cannabis flowers.β
Q. 2000
π 1 views
Junk e-mail is also called:
Correct answer: A
- Spam is junk or unsolicited email sent to many recipients.
- Key concept: mass unsolicited messaging in email systems.
- Formula/logic: none needed here; recognition by common term.
- Exam tip: Remember that βspamβ refers to junk mail, not spoofing or scripts.
- Why others are incorrect:
- B. spoof = faking sender identity, not the message itself.
- C. sniffer script = code used to capture data, not junk mail.
- D. spool = queue or storage area; not the term for junk email.
Q. 1999
π 0 views
Which polymer is used in making non-stick
kitchen ware ?
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Q. 1998
π 1 views
Which of the following pair is incorrect ?
Explanation
- Correct pair is C β Faraday is not known for Diffusion of gases; that work is associated with Grahamβs law of diffusion.
- Other pairs are correct: Roentgen β X-ray; Newton β Law of Gravitation; Pasteur β Bacteriology.
- Grahamβs law: rate of diffusion β 1/βM (molar mass). This is the scientific idea behind diffusion of gases.
- Always match the scientist with their main field/discovery to avoid common misattributions.
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