Top 100 Important Everyday Science Mcqs Set-2 1- Water is a compound because: A. It exists as a solid, a liquid or a gas B. It contains hydrogen and oxygen C. It contains two different elements by chemical bondsD. It cannot be split up into simpler substances by chemical means View Answer Answer : C. It contains two different elements by chemical bonds Description 2- The element nickel is: A. RadioactiveB. Magnetic metalC. NonmagneticD. Complex element metal View Answer Answer : B. Magnetic metal Description 3- Potassium permanganate is used for purifying drinking water, because: A. It is a reducing agentB. It is an oxidizing agentC. It is a sterilizing agent D. It dissolves the impurities of water View Answer Answer : B. It is an oxidizing agent Description 4- Graphite and sillimanite are: A. Refractory mineralsB. Magnesium chloride C. Base minerals D. Potassium bicarbonate View Answer Answer : A. Refractory minerals Description 5- The presence of which of the following salts in water causes corrosion in steam boilers? A. Sodium chlorideB. Calcium bicarbonate C. Magnesium chlorideD. Potassium bicarbonate View Answer Answer : C. Magnesium chloride Description 6- When an iron nail gets rusted, iron oxide is formed: A. With increase in the weight of the nailB. Without increase in the weight of the nail C. With decrease in the weight of the nail D. Without any change in colour or weight of the nail View Answer Answer : A. With increase in the weight of the nail Description 7- Water is a good solvent of ionic salts because: A. It has no colour B. It has a high boiling point C. It has a high specific heatD. It has a high dipole moment View Answer Answer : D. It has a high dipole moment Description 8- The hardest substance available on earth is: A. GoldB. CoalC. PlatinumD. Diamond View Answer Answer : D. Diamond Description 9- Actinides are the elements with atomic number from: A. 36 to 43 B. 89 to 103C. 97 to 114 D. 101 to 115 View Answer Answer : B. 89 to 103 Description 10- The ratio of pure gold in 18 carat gold is: A. 60%B. 75%C. 80%D. 100% View Answer Answer : B. 75% Description 11- Which of the following is the best conductor of electricity? A. ZincB. CopperC. GoldD. Silver View Answer Answer : D. Silver Description 12- The highest grade of coal whose surface is shiny and has the highest calorific value, is: A. PeatB. LigniteC. AnthraciteD. Bituminous View Answer Answer : C. Anthracite Description 13- The element found on the surface of the moon is: A. TinB. TungstenC. TantalumD. Titanium View Answer Answer : D. Titanium Description 14- The average salinity of sea water is: A. 2%B. 2.5%C. 3%D. 3.5% View Answer Answer : D. 3.5% Description 15- Which of the following is the most stable element? A. LeadB. OxygenC. HydrogenD. Uranium View Answer Answer : A. Lead Description 16- Find the odd one: A. MarbleB. ChalkC. LimestoneD. Slaked lime View Answer Answer : D. Slaked lime Description 17- Diamond is harder than graphite because of: A. Different layer of atoms B. Tetrahedral structure of diamondC. Difference of crystalline structures D. None of these View Answer Answer : B. Tetrahedral structure of diamond Description 18- A super conductor is characterized by: A. Zero resistivityB. Low permeability C. High permeability D. Infinite permeability View Answer Answer : A. Zero resistivity Description 19- Of the various forms of carbon, the one which is used for adsorption purpose, is: A. CokeB. DiamondC. Wood charcoalD. Graphite View Answer Answer : C. Wood charcoal Description 20- The main constituents of pearls are: A. Aragonite and conchiolin B. Calcium carbonate and magnesium carbonateC. Ammonium sulphate and sodium carbonateD. Calcium oxide and ammonium chloride View Answer Answer : B. Calcium carbonate and magnesium carbonate Description 1 2 3 4 5
