2. Classification of Materials 1. The scale below shows the hardness value of 5 substances, P to T. Which of the following statement is correct?Material T can withstand the highest heavy load placed on itMaterial Q causes scratches on material P when both accidentally touch each otherThe scale shows the ability of a material to withstand heavy load without breakingMaterial R can be used to cut through material S2. Mercury and iron are both classified as metals. At room temperature, mercury is a liquid and iron is a solid. Which of the following statement is not correct?Both are good electrical conductorsBoth are the good thermal conductorBoth have good strengthBoth have the same melting points3. Chair is generally made of plastic instead of glass. Which statement best explain why plastic is not chosen over glass for this application?Plastics are poor heat conductors dead glass so that the person does not feel cold when sitting on it.Plastic is most transparent than glass so that the appearance on the chair will be more attractivePlastic is harder than glass so that it will not be scratched easilyPlastic hair better flexibility than glass so that it allows bending causes by different weight of user sitting on it4. Which of the following applications does not depend on the thermal conductivity for its use?Mercury in glass thermometerGlass container to store hot waterBimetallic strip in fire alarmThermostat in oven5. Which of the following characteristics is not correct about the flower pot made of ceramics?It has a poor electrical conductivityIt has low solubility in waterIt is brittle It is transparent6. The handle of a cooking Pan is made of plastic. Which reason best explain why it is made of plastics?It has a poor conductor of heatIt has a higher melting pointIt is a poor conductor of electricityIt is light7. Which reason best explain why Aluminium is used for making drink cans instead of zinc?It is lightIt is a good conductor of electricityIt is a good thermal conductorIt is malleable8. Which of the following reason are correct for the classification of materials? I. Material with the different physical states can not be classified together. II. Material with similar physical properties is grouped together. III. The study of materials can be done in a mole systematic way.II, IIII, IIII, II, IIII, II9. Which of the following substances has the higher melting point?WaxMargarine MercuryTable salt10. Which of the following physical properties is suitable for making volleyballs?Low compressibilityMalleableHigh densityGood conductor of heat11. The table below shows the scale of hardness of 5 different substances. Hardness Value 1 2 5 7 10 Substance W V X Y Z The harder the substance, the higher the hardness value. Which statement is not true?W is unable to scratch all the other substances on the scaleX is able to scratch YV able to sketch W but not ZY is able to scratch 3 substance12. Which of the following reason best explain why tungsten is used in a light bulb?It is lightIt has a high melting pointIt has high strengthIt is malleable13. A plate is used to prevent the surface of an object from becoming hot. Which substance is least likely to be the choice of the plate?Iron plate Wooden plateCeramic platePlastic plate14. The diagram below shows different materials with the same load placing on it. Which of the following depicts a material with the highest flexibility?ABCD15. Which of the following physical properties best explains why a balloon is filled with helium gas instead of air?Low densityTake the shape of the balloonHas attractive colorHigh compressibility
