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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. 3750
👁 1 views
The pigment which is responsible for blood clotting is:
Correct option: A
- Why correct: Fibrinogen is the plasma protein that is converted into fibrin by thrombin, forming a mesh that clots blood.
- Key concept: Blood coagulation cascade; fibrin formation seals wounds.
- Brief formula/logical note: Fibrinogen --thrombin→ Fibrin (clot).
- Exam tip: If asked about clotting, think fibrinogen → fibrin, not Hb, glucose, or cells.
- Why others are incorrect: Haemoglobin carries oxygen, glucose is an energy sugar, and blood cells themselves are not the clotting protein.
Q. 3749
👁 2 views
Which among the following diseases are not bacterial?
- Key concept: Not all infectious diseases are caused by bacteria. Some are due to parasites or protozoa.
- Correct answer: B. Malaria and trichomoniasis are caused by a protozoan parasites (Plasmodium; Trichomonas vaginalis), not bacteria.
- Why others are incorrect:
Q. 3748
👁 3 views
A substance used in the fire extinguisher under the trade name of Pyrene is:
Answer: C. Carbon tetrachloride
- Why correct: Pyrene was a trade name for carbon tetrachloride, an extinguishing agent that cools and disrupts the chemical reactions in flame, helping to stop combustion.
- Key concept: Fire suppression by chemical inhibition of radical reactions and cooling.
- Other options: - A) CO2 is used in extinguishers but not linked to Pyrene. - B) Chloroform and D) bleaching powder are not extinguishing agents for fires.
- Exam tip: Remember common extinguishing agents: CO2, H2O, dry chemical; avoid toxic CCl4 references in safety contexts.
Q. 3747
👁 0 views
To an astronaut in space, the sky appears to be:
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Q. 3746
👁 3 views
The study of hair and its diseases is known as:
The correct option is B. Trichology.
- Why correct: Trichology is the branch of dermatology that studies hair and scalp, including diseases and disorders.
- Key concept: The root "tricho-" means hair in Greek.
- Other options:
- A/C Penology — study of punishment and prisons.
- D Pomology — study of fruits.
- Exam tip: Remember "tricho" = hair.
Q. 3745
👁 2 views
Gasoline is obtained from crude petroleum by:
- Correct answer: A — Fractional distillation
- Why: Crude oil is heated and its mixture is passed up a fractionating column; components with different boiling points vaporize and condense at different heights, giving gasoline in a specific boiling-range fraction.
- Key concept: Boiling-point separation of mixtures; fractional distillation separates by boiling range, not by evaporation alone.
- Misleading options: Sublimation and simple evaporation do not separate crude oil into useful fuel fractions; (B) is the same as (A) but redundancy, others are incorrect.
- Exam tip: Remember gasoline corresponds to mid-range distillation fractions (roughly 40–200°C depending on refinery).
Q. 3738
👁 2 views
Volumetric method for determination of fat % of milk is:
Answer: D) Garber method
- The Garber (Gerber) method is a volumetric technique to determine milk fat by separating fat in a butyrometer after acid digestion; fat volume is read directly and converted to % fat.
- Key concept: fat forms a distinct layer whose volume correlates with fat content. A simple conversion factor relates mL of fat to percentage fat.
- Formula/numerical note: % fat ≈ (fat volume in mL) × factor (from calibration).
- Exam tip: distinguish from Soxhlet (solvent extraction) and other methods; Garber is the standard volumetric method for milk fat.
- Why others are incorrect: A, C—not volumetric fat determination; B—Soxhlet is gravimetric, not volumetric.
Q. 3737
👁 1 views
Thiamine deficiency or beriberi, refers
to the lack of:
Explanation
- Correct option: B — Thiamine deficiency is a lack of vitamin B1, known as beriberi.
- Key concept: Thiamine is a coenzyme (thiamine pyrophosphate) essential for carbohydrate metabolism and energy production in cells.
- Why others are incorrect: A is wrong (vitamin K helps blood clotting); C is wrong (vitamin C prevents scurvy); D is wrong (nicotine is a stimulant, not a vitamin).
Q. 3736
👁 1 views
Plants prepare their food by:
Explanation:
- Correct: A. Photosynthesis is the process by which plants trap light energy to convert carbon dioxide and water into glucose (food).
- Key concept: Chlorophyll captures light; energy drives chemical reactions (CO2 + H2O → C6H12O6 + O2).
- Formula cue: 6CO2 + 6H2O + light energy → C6H12O6 + 6O2.
- Exam tip: If the question asks “how plants make food,” choose photosynthesis first.
- Why others are incorrect: Carbohydrolysis, metabolic synthesis, and photorespiration are not the food-producing process in plants.
Q. 3735
👁 0 views
Which of the following animals is carnivorous?
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