Practice focused topic-wise MCQs with answers and explanations for quick revision and exam preparation.
Difficulty select karke sirf is topic ke focused MCQs practice karein. Score, timer aur explanations student-friendly flow me milenge.
Showing 121-130 of 584 questions.
Visibility of light path in a colloid is related to which effect?
A. Tyndall effect
Colloid particles light scatter करते हैं। इसलिए light path visible हो सकता है। / Colloid particles scatter light. Therefore light path may become visible.
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Which mixture can generally be separated easily by filter paper?
B. रेत और पानीSand and water
Sand particles बड़े होते हैं और filter paper पर रुक सकते हैं। यह filtration का common example है। / Sand particles are large and can be retained on filter paper. This is a common example of filtration.
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Filtration is most useful for separating which mixture?
C. अघुलनशील ठोस और द्रवInsoluble solid and liquid
Filtration insoluble solid को liquid से separate करती है। जैसे sand और water। / Filtration separates an insoluble solid from a liquid. Example is sand and water.
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What is a simple method to recover salt from salt water?
D. वाष्पीकरणEvaporation
Evaporation से water हटता है और salt बच सकता है। यह physical separation है। / Evaporation removes water and salt can remain. This is physical separation.
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Which method separates two miscible liquids based on their boiling points?
A. आसवनDistillation
Distillation boiling point difference पर आधारित है। यह liquid mixtures को separate कर सकती है। / Distillation is based on difference in boiling points. It can separate liquid mixtures.
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How can iron filings and sulfur powder be separated?
B. चुंबक सेBy magnet
Iron magnetic होता है और sulfur नहीं। Magnet iron filings को attract कर सकता है। / Iron is magnetic and sulfur is not. A magnet can attract iron filings.
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What can chromatography be used for?
A. मिश्रण के रंगीन components अलग करने के लिएTo separate colored components of a mixture
Chromatography components की different movement पर आधारित separation method है। Ink colors को अलग करना common example है। / Chromatography is a separation method based on different movement of components. Separating ink colors is a common example.
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Which method divides crude oil into different fractions?
C. आंशिक आसवनFractional distillation
Fractional distillation boiling point differences पर आधारित है। Crude oil mixture को fractions में अलग किया जाता है। / Fractional distillation is based on boiling point differences. Crude oil mixture is separated into fractions.
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Which is the correct difference between pure substance and mixture?
D. pure substance fixed composition रखता है और mixture variable composition रख सकता हैPure substance has fixed composition and mixture can have variable composition
Pure substance की composition definite होती है। mixture में components का ratio बदल सकता है। / A pure substance has definite composition. In a mixture the ratio of components can vary.
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Presence of nitrogen and oxygen in air shows what?
A. हवा एक mixture हैAir is a mixture
Air में several gases physically mixed हैं। इसलिए air mixture है। / Air has several gases physically mixed. Therefore air is a mixture.
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