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. Ferrous and non - ferrous






2. 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






3. 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.






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






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






6. The resistance a material offers to penetration of scratching






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






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






9. Fixed volume and fixed shape






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






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






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






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






14. The ability of a material to withstand pulling forces






15. No fixed volume and no fixed shape






16. 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)






17. Fixed volume but take the shape of their container






18. Earthenware - porcelain - stoneware and glass






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






20. Thermosets and thermoplastics






21. Natural wood and manmade






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






23. Hydrogen bond - van der Waals bond






24. 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)






25. A force of attraction between particles






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






27. A substance that cannot be decomposed into simpler substances






28. Bond between adjacent oppositely charged ions






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






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






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






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






33. 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






34. A substance made of only one element or compound






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






36. Vegetable and meat origin






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