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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. 466
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Rickets is a disease caused by the deficiency of
Answer: B. Vitamin D
- Rickets in children is caused by deficiency of vitamin D, which is essential for calcium and phosphate absorption in the gut.
- Key concept: Vitamin D enables mineral uptake for proper bone mineralization; without it, bones become soft and defective.
- Tip: Check serum 25(OH)D levels to assess vitamin D status; supplementation or sunlight can correct deficiency.
- Why others are incorrect: Vitamin K, B1, and A do not primarily control calcium/phosphate absorption; their deficiencies cause different problems.
Q. 465
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Which of the following diseases is not caused by bacteria?
Correct answer: D — Chickungunya
- Key concept: Chickungunya is caused by a virus (Chikungunya virus), not bacteria.
- Other options: Cholera (bacteria Vibrio cholerae), Typhoid (bacteria Salmonella typhi), Tuberculosis (bacteria Mycobacterium tuberculosis).
- Why viral, not bacterial: Viruses are smaller and require host cells to replicate; diseases like chikungunya spread via Aedes mosquitoes as a vector.
Q. 464
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Thyroid gland is located
Answer: D — in the neck region
- Why correct: The thyroid is a butterfly-shaped endocrine gland located in the anterior neck, below the larynx, surrounding the trachea.
- Key concept: Endocrine glands release hormones directly into the blood; thyroid hormones regulate metabolism.
Q. 463
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Decibel is the unit used for
Correct answer: C
- Reason: Decibel is a unit used to express the intensity or level of sound.
- Key concept: It is a logarithmic scale so that L = 10 log10(I/I0), where I is sound intensity and I0 is a reference intensity.
- Why not others: It does not measure light intensity, heat, or frequency of radio waves.
- Exam tip: Remember “dB” relates to sound pressure/ intensity, not energy, light, or frequency.
Q. 462
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Light year is a unit of measurement of
Correct option: B
- Correct reason: A light year measures distance, not time or speed. It is the distance light travels in one year.
- Key concept: Distance = speed × time; with light speed c ≈ 3×10^8 m/s and 1 year ≈ 3.156×10^7 s, so 1 ly ≈ 9.46×10^15 m ≈ 9.46×10^12 km.
- Exam tip: Use the relation “distance = speed × time” to identify units like light year that express distance over a time interval.
- Why others are wrong: A measures speed, C measures speed, D measures time.
Q. 461
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Malaria is caused by
Correct option: A
- Explanation: Malaria is caused by Plasmodium, a parasite (not a virus, bacteria, or fungus). It is a parasitic infection transmitted by Anopheles mosquitoes.
- Key concept: Parasites live in host tissues/cells (liver & red blood cells) and rely on mosquitoes for transmission.
- Tip: In exams, remember malaria is a protozoan parasite, not a virus/bungus/bacteria.
- Why others incorrect: A, C, D are wrong because malaria is not viral, bacterial, or fungal.
Q. 457
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Full form of "GPS" is
Correct answer: B - Global Positioning System
- Why correct: GPS is a satellite-based navigation system that provides location and time information to a receiver anywhere on Earth.
- Key concept: trilateration using signals from at least 4 satellites to determine 3D position and time.
- Formula (brief): P = f(Si, t, c) where distance to satellites is computed from signal travel time; adds receiver clock correction.
Q. 441
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Acid rain is caused by
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Q. 440
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The virus infection causes AIDS is known as
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Q. 439
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Which is an example of pollution-free energy?
Correct answer: Wind energy
- Wind energy is generated from moving air using turbines, producing electricity without burning fuels.
- Key concept: Pollution-free because no emissions or hazardous waste during operation; only lifecycle impacts are minimal.
- Formula/logic: If emissions = 0 during operation, environmental benefit is high; E = 0 pollutants from the source.
- Exam tip: Remember “pollution-free” means no air/ground/water pollution during use, not lifecycle harmlessness.
- Why others are incorrect: Coal and mineral oil emit CO2 and pollutants when burned; none of these are clean energy sources.
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