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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. 2342
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Pituitary gland is located in
Answer: A - brain
- Reason: The pituitary gland sits at the base of the brain in a small cavity called the sella turcica, part of the central nervous system.
- Key concept: It is the endocrine “master gland” regulating other hormones, connected to the hypothalamus.
- Tip: Remember “pituitary = brain” to quickly recall location in exams.
- Why others are wrong: Kidneys, liver, and intestines are not located in the brain and have different roles (filtration, metabolism, digestion).
Q. 2341
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Angora wool is extracted from
Correct answer: A — Angora wool is obtained from Angora rabbits.
- Key concept: Different animals produce different specialty fibers; Angora wool is the long, soft fiber from rabbits.
- Why others are incorrect: - B) Sheep produce regular wool, not Angora wool. - C) Fox does not produce Angora wool. - D) Goat produces mohair or cashmere, not Angora wool.
- Exam tip: Remember fiber names by source: Angora rabbit → Angora wool; Angora goat → Mohair.
Q. 2340
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Our bones and teeth are generally made of
Correct answer: A
- Why: Bones and teeth are mainly made of calcium phosphate minerals. The common reference here is tricalcium phosphate (Ca3(PO4)2), a key form of calcium phosphate in bone/teeth structure.
- Key concept: The mineral component of bones/teeth is calcium phosphate, not calcium carbonate or fluoride compounds.
- Note on other options: Fluoropetite, chloropetite, and hydrolith are not standard biominerals in bones/teeth; fluorides affect enamel but don’t form the bulk mineral.
- Exam tip: Remember bone/teeth minerals = calcium phosphate family.
Q. 2339
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Which among the following is a large spectrum
Antibiotic ?
Answer: Ampicillin
- Why correct: Ampicillin is a broad-spectrum (large spectrum) penicillin that inhibits bacterial cell wall synthesis, effective against many Gram-positive and some Gram-negative organisms.
- Key concept: Broad-spectrum antibiotics cover a wide range of bacteria; mechanism often involves beta-lactam ring targeting cell wall synthesis.
- Other options: Paracetamol is not an antibiotic; Penicillin is narrower in scope; Chloramphenicol is broad-spectrum but not the standard “large spectrum” class here.
- Exam tip: Remember: “broad-spectrum” often ends with -cilin or -mide; match with the drug class and spectrum wording.
Q. 2338
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Which among the following elements increases the
absorption of water and calcium in plants ?
Explanation
- Correct answer: B. Boron – Boron is a micronutrient essential for cell wall integrity and membrane function, which enhances water movement and calcium transport within plant tissues.
- Key concept: Boron affects osmotic balance and apoplastic flow, aiding uptake and distribution of calcium.
- Exam tip: Remember boron deficiency symptoms include weak growth and brittle tissues due to poor cell wall formation.
- Why others are incorrect: Manganese, Copper, and Molybdenum are mainly involved in enzyme activities and metabolic processes, not primarily in water/calcium absorption.
Q. 2337
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Which among the following helps in circulation of blood ?
Answer: D. Lymphocytes
- Why correct: Lymphocytes are white blood cells that circulate in the blood and lymph, contributing to immune surveillance as they move through the circulatory system.
- Key concept: Circulation involves movement of cells and plasma through vessels; white blood cells continuously travel in blood to reach tissues.
- Brief note on others:
- A) Erythrocytes carry oxygen but are not primarily responsible for “circulating” the blood itself—oxygen transport is their main function.
- B) Platelets aid in clotting, not circulation per se.
- C) Monocytes are immune cells, but not the general circulatory facilitator.
- Exam tip: If a question asks about cells in the bloodstream with immune roles, lymphocytes are key; pandas of circulation are all blood cells, but functionally they differ.
Q. 2240
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Main constituents of biogas are:
Correct option: C
- Explanation: Biogas mainly consists of methane (CH4) and carbon dioxide (CO2) produced during anaerobic digestion. The typical composition is about 50–70% CH4 and 30–50% CO2.
- Key concept: Anaerobic digestion yields a methane-rich gas; CO2 is the other major gas.
- Why others are wrong: A includes carbon monoxide (not a main component); B has butane (not present); D has ethylene (not a major constituent—CH4 is missing).
- Exam tip: Remember “Biogas = CH4 + CO2” and that CH4 is the energy-bearing component.
Q. 2238
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The type of crop which is able to fix nitrogen from air is known as:
- Correct answer: A. Legume
- The type of crops that can fix atmospheric nitrogen (N2) into usable forms is legumes, via symbiotic bacteria (Rhizobium) in root nodules.
Q. 2211
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Which is the largest part of the human brain ?
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Q. 2207
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The growth of bacteria is measured by:
Correct answer: B
- Reason: Growth is often tracked by turbidity, i.e., optical density, measured with a spectrophotometer. Higher cell density scatters more light, increasing absorbance.
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