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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. 2385
👁 1 views
Which cells in our body are popularly called
'soldiers' of the human body?
Answer: B. White blood cells
- Why correct: White blood cells defend the body against infections; they are the immune “soldiers.”
- Key concept: Immunity and defense mechanisms; WBCs identify and destroy pathogens.
- Notes: If numerical idea is needed: higher WBC count indicates infection or inflammation.
- Exam tip: Remember “soldiers” = immune cells protecting the body.
- Why others are incorrect: Eosinophils and basophils are specific WBC types, not the general immune defense; Red blood cells transport oxygen, not defense.
Q. 2384
👁 1 views
The amount of light entering into eye can be
controlled and regulated by ___________ .
Correct option: C - pupil
- Why: The pupil is the opening in the eye whose size is controlled by the iris. It regulates the amount of light reaching the retina.
- Key concept: Pupil size changes with light through the contraction/relaxation of the iris muscles (sphincter and dilator pupillae).
- Tip: In bright light, the pupil constricts to protect the retina; in dim light, it dilates.
Q. 2378
👁 2 views
Which gas in its solid state is also known as dry
ice?
Explanation:
- Correct answer: B. Carbon dioxide
- Dry ice is the solid form of CO₂ that sublimates (goes directly from solid to gas) at −78.5°C, skipping liquid phase.
Q. 2377
👁 2 views
J J Thomson received the Nobel Prize in Physics for the discovery of ________.
Correct option: B
- Reason: J.J. Thomson discovered the electron using cathode rays and measured their charge-to-mass ratio (e/m).
- Key concept: cathode rays reveal negatively charged particles smaller than atoms; determination of e/m led to the first subatomic particle.
- Formula/note: e/m ratio was calculated from observed deflection in electric and magnetic fields.
- Why others are incorrect: Protons (A) and Neutrons (C) were identified later; Positrons (D) were discovered by Anderson.
- Exam tip: Associate Thomson with electron discovery and the plum pudding model.
Q. 2348
👁 2 views
Kidney disease in man is caused by the pollutant
Correct option: A
Answer: Cadmium
Answer: Cadmium
- Reason: Cadmium is a toxic heavy metal that damages the kidneys, especially the renal tubules, leading to nephrotoxicity and kidney disease.
- Key concept: Heavy metal-induced nephrotoxicity; Cd accumulates in proximal tubule cells causing functional impairment.
- Note on others: Iron, Cobalt, and Carbon are not primarily linked to causing chronic kidney disease in this context.
- Exam tip: Remember common nephrotoxic metals—cadmium is a classic culprit for kidney damage.
Q. 2347
👁 0 views
The age Of trees is determined by its
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Q. 2346
👁 1 views
Dehydration in human body is caused due to the loss of
Question: Dehydration in human body is caused due to the loss of
- Correct option: B water
- Salts (electrolytes) help fluid balance but are not the direct cause.
- Hormones regulate balance but are not the losing agent.
- Vitamins are not involved in acute fluid loss.
Q. 2345
👁 2 views
In the eye colour vision is effected by the presence of
Correct answer: C — Cones
- Why correct: Cones are photoreceptors responsible for color vision and function best in bright light.
- Key concept: Humans have three types of cones (S, M, L) that detect different wavelengths, enabling color perception.
- Why others are incorrect: Rods detect light intensity and motion (not color) and work in dim light; choroid coat and sclerotic coat are supportive eye structures, not color vision receptors.
- Exam tip: If a question asks about color vision, think cones, not rods.
Q. 2344
👁 2 views
The disease caused by Asbestos is
Correct option: C
- Emphysema is linked to asbestos exposure when inhaled fibers irritate lungs, causing breathing difficulty and increased risk of lung diseases, including chronic obstructive lung damage.
- Key concept: Asbestos fibers cause inflammation and scarring (fibrosis) leading to decreased air exchange in alveoli.
- Formula/logic: Exposure → inflammation + fibrosis → reduced lung elasticity → emphysema symptoms (breathlessness).
Q. 2343
👁 1 views
Onion is a modified form of
Correct answer: B (Stem)
- Reason: Onion is a bulb, a modified underground stem with enlarged bases of leaves for storage.
- Key concept: Storage organs can be modified stems, not leaves or roots.
- Why others are wrong: A leaf is not enlarged to form a bulb; a root is not the storage organ here; onion stems specifically form the bulb.
- Exam tip: Remember: bulb = modified stem (underground) with leaf bases; tubers = modified stems too, but different form (e.g., potato).
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