MCQ 11 MarkThe metal is a liquid at room temperature.APotassiumBZincCGold✓MercuryAnswerCorrect option: D. MercuryView full question & answer→
MCQ 21 MarkBrass is an alloy ofACopper and tin✓Copper and zincCZinc and leadDLead and tinAnswerCorrect option: B. Copper and zincView full question & answer→
MCQ 31 MarkHeating of the ore in the absence of air to high temperature✓CalcinationBroastingCpulverizationDsmeltingAnswerCorrect option: A. CalcinationHeating of the ore in the absence of air to a high temperature that is high but insufficient to melt the ore is known as calcination.View full question & answer→
MCQ 41 MarkCrushing of the ore into a fine powderACalcinationBroasting✓pulverizationDsmeltingAnswerCorrect option: C. pulverizationThe process of crushing ores into a fine powder in big crushers and ball mills is known as pulverisation.View full question & answer→
MCQ 51 MarkThe diavalent metal whose oxide is reduced to metal by electrolysis of its fused salt is ________✓AlBNaCMgDKAnswerCorrect option: A. AlThe diavalent metal whose oxide is reduced to metal by electrolysis of its fused salt is Al.View full question & answer→
MCQ 61 MarkThe metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ________AFeBMg✓PbDAlAnswerCorrect option: C. PbThe metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction Pb.View full question & answer→
MCQ 71 MarkThe metal which does not react with water or dilute $H _2 SO _4$ but reacts with concentrated $H _2 SO _4$ is_________AAl✓CuCZnDFeAnswerCorrect option: B. CuThe metal which does not react with water or dilute $H _2 SO _4$ but reacts with concentrated $H _2 SO _4$ is Cu.View full question & answer→
MCQ 81 MarkThe two main metals in bronze areACopper and zincBCopper and leadCCopper and nickel✓Copper and tinAnswerCorrect option: D. Copper and tinView full question & answer→
MCQ 91 MarkThis is not an alloy of copper:ABrassBBronze✓SolderDDurlamium AnswerCorrect option: C. SolderView full question & answer→
MCQ 101 MarkAluminium powder is used in thermite welding because✓It is a strong reducing agentBIt is a strong oxidizing agentCIt is corrosion resistantDIt is a good conductor of heatAnswerCorrect option: A. It is a strong reducing agentView full question & answer→
MCQ 111 MarkHeating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known asASmeltingBOre dressing✓CalcinationDbessemerisationAnswerCorrect option: C. CalcinationHeating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as calcination.View full question & answer→
MCQ 121 MarkThe main ore used for the extraction of iron is✓Haematite BCalamineCBauxiteDCryoliteAnswerCorrect option: A. Haematite The main ore used for the extraction of iron is haematite.View full question & answer→
MCQ 131 MarkThe metals zinc and tin are present in the alloyASolderBBrass✓BronzeDDuraluminAnswerCorrect option: C. BronzeView full question & answer→