Top 100 Important Everyday Science Mcqs Set-1 41- The chemical name for urea is: A. AneurinB. ChloretheneC. CarbamideD. None of these View Answer Answer : C. Carbamide Description 42- Permanent hardness of water can be removed by adding: A. PotassiumB. ChlorineC. Washing sodaD. Bleaching powder View Answer Answer : C. Washing soda Description 43- The formula for Plaster of Paris is: A. CaSO₄ B. CaSO₄.2H₂O C. 2CaSO₄.4H₂O D. 2CaSO₄.H₂O View Answer Answer : D. 2CaSO₄.H₂O Description 44- Which of the following substance is bad conductor of electricity but a good conductor of heat? A. MicaB. PerspexC. CelluloidD. Asbestos View Answer Answer : A. Mica Description 45- Which of the following pairs does not contain a coinage metal? A. Copper and Silver B. Silver and GoldC. Zinc and GoldD. Copper and Silver View Answer Answer : C. Zinc and Gold Description 46- Which of the following is used in pencils? A. PhosphorusB. GraphiteC. SiliconD. Charcoal View Answer Answer : B. Graphite Description 47- Which of the following is the second most abundant metal in the earth’s crust? A. ZincB. IronC. AluminumD. Copper View Answer Answer : B. Iron Description 48- Carborundum is: A. Silicon nitride B. Silicon PhosphateC. Silicon dioxideD. Silicon carbide View Answer Answer : D. Silicon carbide Description 49- Glass is made by heating the mixture of silica, quartz, soda potash, lead, calcium, cullet and decolorizer in suitable proportions to: A. 100°CB. 500°CC. 850°CD. 1100°C View Answer Answer : D. 1100°C Description 50- Which of the following is the best conductor of electricity? A. ZincB. SilverC. MicaD. Copper View Answer Answer : B. Silver Description 51- Washing soda is the common name for: A. Calcium carbonate B. Calcium bicarbonate C. Sodium carbonateD. Sodium bicarbonate View Answer Answer : C. Sodium carbonate Description 52- The filament of an electric bulb is made of: A. IronB. NichromeC. TungstenD. Graphite View Answer Answer : C. Tungsten Description 53- Bleaching powder is made from: A. Lime and chlorineB. Soda ash and limeC. Chlorine and charcoal D. Sulphur dioxide and gypsum View Answer Answer : A. Lime and chlorine Description 54- The two elements that are frequently used for making transistors are: A. Boron and aluminum B. Silicon and germaniumC. Iridium and tungsten D. Niobium and columbium View Answer Answer : B. Silicon and germanium Description 55- Which of the following gases is not known as greenhouse gas? A. MethaneB. Carbon monoxideC. Nitrous oxide D. Chlorofluorocarbon View Answer Answer : B. Carbon monoxide Description 56- Which of the following is not a natural oxide? A. WaterB. Nitric oxide C. Sulphur dioxide D. Carbon monoxide View Answer Answer : D. Carbon monoxide Description 57- Titanium is purified by: A. HydraulicB. Zone refining C. ElectrolysisD. Van Arkel method View Answer Answer : D. Van Arkel method Description 58- Which of the following is used in making smoke bombs? A. CarbonB. HydrogenC. SulphurD. Phosphorus View Answer Answer : D. Phosphorus Description 59- Consider the following statements regarding graphite: 1. It is an allotrope of carbon 2. It is a good conductor of heat and electricity 3. It can be artificially produced. A. 2 and 3 are correctB. 1 and 3 are correct C. 1, 2 and 3 are correctD. 1 and 2 are correct View Answer Answer : C. 1, 2 and 3 are correct Description 60- Caustic soda is: A. NaOHB. NaHCO₃C. NaClD. Na₂CO₃ View Answer Answer : A. NaOH Description 1 2 3 4 5
