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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. 438
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The sex of a child before birth can be determined by:
Correct option: B
- Why: Amniocentesis analyzes fetal cells in amniotic fluid to obtain a karyotype (sex chromosomes XX/XY). This reveals the baby’s sex before birth.
- Key concept: Chromosomal sex determination (Karyotyping).
- About other options: Amnoscopy is not a standard procedure; Amniography is imaging with contrast, not for sex determination.
- Exam tip: Know common prenatal tests: amniocentesis for genetics; ultrasound for anatomy; avoid confusing terms.
Q. 437
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The function of Kidney is to:
Correct answer: A
- Explanation: The kidneys purify blood by filtering waste products and excess fluids through nephrons, forming urine. This regulates body fluids, electrolytes, and acid-base balance.
- Key concept: Excretion and homeostasis via nephron filtration, reabsorption, and secretion.
- Why not others? B is handled by the immune system; C by digestive organs; D is false because kidneys perform purification.
- Exam tip: Remember the primary function of the kidney as excretory organ for waste removal and fluid balance.
Q. 436
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How much blood does a man have in his body?
- Correct answer: 7%.
- Why: In an average adult, blood volume ≈ 7% of body weight. For a ~70 kg man, this is about 5 liters, aligning with the 7% rule.
- Key concept: Blood volume is a constant proportional to body mass; percentage helps estimate liters.
- Formula: Blood volume ≈ 0.07 × body weight (kg) = liters.
- Exam tip: If given body weight, multiply by 0.07 to estimate blood volume quickly.
- Why others are incorrect: 4% and 10% are not standard physiologic values for an adult human; "None of these" is wrong because 7% is correct.
Q. 428
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Arya Bhatt was a renowned Indian
Aryabhata was a renowned ancient Indian mathematician and astronomer. He lived during the period of Gupta Empire.
Q. 411
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Which of the following is a greenhouse gas
Chlorofluorocarbons (CFCs) are considered greenhouse gases due to their ability to trap heat in the Earth's atmosphere.
Q. 409
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The sky looks blue due to
The scattering of sunlight is a phenomenon that occurs when sunlight interacts with particles or molecules in the Earth's atmosphere, causing the light to change direction and spread out in various directions.
Q. 408
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Which one of the following is a chemical change?
A chemical change, also called a chemical reaction, happens when substances combine or break apart to form entirely new substances with different properties.
Q. 407
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Pure gold is of
A "carat" is a unit of measurement used to express the weight of gemstones, particularly diamonds and gold etc.
Q. 406
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When a moving bus suddenly stops, passengers sitting inside leans forward. This is due to
Inertia of motion is defined as the property of a body to resist any change to its state of uniform motion.
Q. 405
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A heavy stone appears to be lighter in water. This is due to
Water creates upward pressure due to the principle of buoyancy, as described by Archimedes' principle.
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