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. Hydrogen bond - van der Waals bond






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






3. 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






4. Natural wood and manmade






5. Bond between adjacent oppositely charged ions






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






7. The ability of a material to withstand pulling forces






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






9. No fixed volume and no fixed shape






10. Ferrous and non - ferrous






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






12. The resistance a material offers to penetration of scratching






13. A substance made of only one element or compound






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






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






16. A force of attraction between particles






17. A substance that cannot be decomposed into simpler substances






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






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






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






21. Vegetable and meat origin






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






23. Earthenware - porcelain - stoneware and glass






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






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






26. 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






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






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






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






30. Fixed volume and fixed shape






31. Thermosets and thermoplastics






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






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






34. 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.






35. Fixed volume but take the shape of their container






36. 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)






37. 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)