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






2. 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.






3. 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)






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






5. No fixed volume and no fixed shape






6. A substance made of only one element or compound






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






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






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






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






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






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






13. A substance that cannot be decomposed into simpler substances






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






15. The resistance a material offers to penetration of scratching






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






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






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






19. 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)






20. Hydrogen bond - van der Waals bond






21. 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






22. Earthenware - porcelain - stoneware and glass






23. Thermosets and thermoplastics






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






25. 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






26. The ability of a material to withstand pulling forces






27. Ferrous and non - ferrous






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






29. Natural wood and manmade






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






31. A force of attraction between particles






32. Fixed volume and fixed shape






33. Vegetable and meat origin






34. Bond between adjacent oppositely charged ions






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






36. Fixed volume but take the shape of their container






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