📄 All MCQs
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385–396 of 422
What is the density of water?
💡 Explanation: Standard density
Average lifespan of red blood cells?
💡 Explanation: RBC lifespan is 120 days
What happens to pressure when gas volume decreases?
💡 Explanation: Boyle’s law
Who discovered the photoelectric effect?
💡 Explanation: Einstein won Nobel Prize
What percentage of the human body is water by weight?
💡 Explanation: Average water content is ~60%
What is the chemical formula of ozone?
💡 Explanation: Ozone contains three oxygen atoms
Which line divides the Earth into Northern and Southern Hemispheres?
💡 Explanation: Equator splits Earth into two halves
Which component of the human body primarily stores energy?
💡 Explanation: Fats act as the main energy reserve
Which sentence is grammatically correct?
💡 Explanation: The correct form uses 'doesn't' (does not) with the base form of the verb.
What does the prefix 'un-' mean?
💡 Explanation: The prefix 'un-' means 'not' or 'opposite of', e.g., unhappy means not happy.
Which is a proper noun?
💡 Explanation: Pakistan is a proper noun as it names a specific country. Proper nouns are always capitalized.
What is the plural of 'Child'?
💡 Explanation: The plural of child is children — an irregular plural form.