Test your basic knowledge |

Basic Matter

Subject : engineering
Instructions:
  • Answer 37 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Caused by an attraction between the positively charged metal atom nuclei and the negatively charged cloud of free electrons. Free electron allows metals to be a good thermal and electrical conductors and let the bond not fixed in position






2. Natural wood and manmade






3. The resistance a material offers to penetration of scratching






4. 1) Thermoplastics plastics 2) Thermoset plastics 3) Elastomers






5. Bond that shares electrons in order to complete part- filled shells






6. The ability of a material to resist the propagation of cracks






7. A substance that cannot be decomposed into simpler substances






8. 1) glasses 2) glass ceramics 3) Graphite 4)Diamond






9. V = IR (V= voltage - I = current - R = resistance). unit - Ohms






10. A mixture composed of two or more substances (materials) with one substance acting as the matrix or glue






11. A substance made of only one element or compound






12. Formed when the fluctuating electrostatic charge in adjacent atoms of different molecules produces a weak electrostatic force between the molecules. Also present as a secondary bond between the long- chain molecules of polymers.






13. Ferrous and non - ferrous






14. A measure of the degree of increase in dimension when an object is heated. This can be measured by an increase in the length (m) - area (m2) or volume (m3). The expansivity can be measured as a fractional increase in dimension per Kelvin increase in






15. Fixed volume but take the shape of their container






16. Thermosets and thermoplastics






17. A positively or negatively charged atom or molecule caused by he loss or gain of electrons from an atom or atoms






18. A substance made of two or more substances that can be separated by physical means - ie not chemically bonded together






19. Mass per unit volumn of a material (D = M/V) unit : kg/m3






20. The smallest part of an element that can exist chemically






21. A substance formed by the combination of elements in fixed proportions






22. Fixed volume and fixed shape






23. Bond between adjacent oppositely charged ions






24. The resistance of an elastic body to deflection by an applied force






25. Hydrogen bond - van der Waals bond






26. The ability of a material to be drawn or extruded into a wire or other extended shape.






27. 1)reinforced plastics 2)Metal- matrix composites 3)Ceramic- matrix composites 4)sandwich structures 5)concrete






28. A mixture that contains at least one metal. This can be a mixture of metals or a mixture of metals and non - metals






29. This is the measure of a material's ability to conduct electricity. lower resistivity conducts electricity well






30. A measure of how fast heat is conduct through a slab of material with a given temperature difference across the slab. Unit: W/m C (W = watts - m = metres - C = Celsius)






31. Earthenware - porcelain - stoneware and glass






32. 1) Ferrous metals and alloys (irons - carbon steels - alloy steels - stainless steels - too and die steels) 2) nonferrous metals and alloys (aluminum - copper - magnesium - nickel - titanium - precious metals - refractory metals - super alloys)






33. A force of attraction between particles






34. No fixed volume and no fixed shape






35. Vegetable and meat origin






36. The ability of a material to withstand pulling forces






37. Two or more atoms which are normally bonded together covalently