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. Two or more atoms which are normally bonded together covalently






2. Bond between adjacent oppositely charged ions






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






4. 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)






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






6. The ability of a material to withstand pulling forces






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






8. 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






9. A substance that cannot be decomposed into simpler substances






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






11. 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.






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






13. Earthenware - porcelain - stoneware and glass






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






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






16. 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






17. Fixed volume and fixed shape






18. A force of attraction between particles






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






20. Thermosets and thermoplastics






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






22. Natural wood and manmade






23. No fixed volume and no fixed shape






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






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






26. Hydrogen bond - van der Waals bond






27. Fixed volume but take the shape of their container






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






29. 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)






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






31. Vegetable and meat origin






32. A substance made of only one element or compound






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






34. Ferrous and non - ferrous






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






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






37. The resistance a material offers to penetration of scratching