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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. Two or more atoms which are normally bonded together covalently






3. The resistance a material offers to penetration of scratching






4. A force of attraction between particles






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






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






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






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






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






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






11. No fixed volume and no fixed shape






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






13. Hydrogen bond - van der Waals bond






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






15. Bond between adjacent oppositely charged ions






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






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






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






19. 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.






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






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






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






23. Fixed volume and fixed shape






24. Fixed volume but take the shape of their container






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






26. Ferrous and non - ferrous






27. 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






28. The ability of a material to withstand pulling forces






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






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. 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)






32. Natural wood and manmade






33. Earthenware - porcelain - stoneware and glass






34. Thermosets and thermoplastics






35. A substance made of only one element or compound






36. Vegetable and meat origin






37. A substance that cannot be decomposed into simpler substances







Sorry!:) No result found.

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