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 31-40 of 584 questions.
Which substance is an element?
B. ऑक्सीजनOxygen
ऑक्सीजन एक तत्व है। पानी compound है और नमक घोल mixture है। / Oxygen is an element. Water is a compound and salt solution is a mixture.
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C. दो या अधिक तत्वों का निश्चित अनुपात में रासायनिक संयोजनChemical combination of two or more elements in fixed ratio
यौगिक में elements निश्चित अनुपात में chemically combined होते हैं। इसका composition fixed होता है। / In a compound elements are chemically combined in fixed ratio. Its composition is fixed.
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Which of the following is a compound?
D. पानीWater
पानी hydrogen और oxygen का compound है। इसका composition fixed रहता है। / Water is a compound of hydrogen and oxygen. Its composition remains fixed.
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What is the main difference between a mixture and a compound?
A. मिश्रण भौतिक संयोजन है और यौगिक रासायनिक संयोजन हैMixture is physical combination and compound is chemical combination
मिश्रण में substances physically mixed होते हैं। यौगिक में elements chemically fixed ratio में जुड़े होते हैं। / In a mixture substances are physically mixed. In a compound elements are chemically combined in fixed ratio.
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What is the main characteristic of a homogeneous mixture?
A. समान संरचना पूरी मात्रा मेंUniform composition throughout
समांगी मिश्रण हर भाग में समान दिखता है। नमक का पानी इसका सरल उदाहरण है। / A homogeneous mixture looks uniform throughout. Salt water is a simple example.
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What is the main characteristic of a heterogeneous mixture?
B. अलग-अलग भागों में अलग composition होनाHaving different composition in different parts
विषमांगी मिश्रण में composition हर जगह समान नहीं होता। रेत और पानी इसका उदाहरण है। / In a heterogeneous mixture composition is not uniform throughout. Sand and water is an example.
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Salt water is which type of mixture?
C. समांगी मिश्रणHomogeneous mixture
नमक पानी में समान रूप से घुल जाता है। इसलिए नमक का पानी homogeneous mixture है। / Salt dissolves uniformly in water. Therefore salt water is a homogeneous mixture.
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What type of mixture is sand and water?
D. विषमांगी मिश्रणHeterogeneous mixture
रेत पानी में समान रूप से नहीं घुलती। इसलिए यह heterogeneous mixture है। / Sand does not dissolve uniformly in water. Therefore it is a heterogeneous mixture.
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Sugar solution in water is which type of mixture?
A. समांगी मिश्रणHomogeneous mixture
शक्कर पानी में समान रूप से घुल जाती है। इसलिए solution homogeneous mixture होता है। / Sugar dissolves uniformly in water. Therefore a solution is a homogeneous mixture.
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At general school level milk is considered what type of matter?
B. मिश्रणMixture
दूध कई पदार्थों का mixture है। परीक्षा में इसे pure substance न मानें। / Milk is a mixture of many substances. In exams do not treat it as a pure substance.
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