MCQ 11 MarkWhich inert gas is used in flashlamps for photography ?AArgonBNeonCHelium✓KryptonAnswerCorrect option: D. KryptonKryptonView full question & answer→
MCQ 21 MarkMelting of polar ice caps is associated with✓global warmingBozone depletionCacid rainDoxidationAnswerCorrect option: A. global warmingglobal warmingView full question & answer→
MCQ 31 MarkWhich of the following contributes (s) to the greenhouse effect?AMethaneBChlorofluorocarbOflsCCarbon dioxide✓All of theseAnswerCorrect option: D. All of theseAll of theseView full question & answer→
MCQ 41 MarkDry ice is✓solid carbon dioxideBsupercooled iceCcrushed iceDsolid oxygenAnswerCorrect option: A. solid carbon dioxidesolid carbon dioxideView full question & answer→
MCQ 51 MarkTin plating is the process of coating a metal with a layer ofAaluminiumBzincCcopper✓tinAnswerCorrect option: D. tintinView full question & answer→
MCQ 61 MarkGalvanizing is the process of coating iron with a layer of molten✓zincBcopperCtinDchromiumAnswerCorrect option: A. zinczincView full question & answer→
MCQ 71 MarkRust isAiron(Il) oxideBiron (II) sulphate✓hydrated iron (III) oxideDiron(Ill) sulpbatcAnswerCorrect option: C. hydrated iron (III) oxidehydrated iron (III) oxideView full question & answer→
MCQ 81 MarkWhich among the following is not an example of oxidation?AFormation of metal oxidesBRustingCBurning of fuels✓PhotosynthesisAnswerCorrect option: D. PhotosynthesisPhotosynthesisView full question & answer→