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Basic Matter

Subject : engineering
  • Answer 37 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. 1) glasses 2) glass ceramics 3) Graphite 4)Diamond

2. A substance that cannot be decomposed into simpler substances

3. Vegetable and meat origin

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

5. A substance made of only one element or compound

6. 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

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

8. No fixed volume and no fixed shape

9. The resistance a material offers to penetration of scratching

10. The ability of a material to withstand pulling forces

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

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

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

14. A force of attraction between particles

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

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

17. 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)

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

19. Ferrous and non - ferrous

20. Natural wood and manmade

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

22. Earthenware - porcelain - stoneware and glass

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

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

25. Fixed volume and fixed shape

26. 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)

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

28. Bond between adjacent oppositely charged ions

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

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

31. Thermosets and thermoplastics

32. Fixed volume but take the shape of their container

33. 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.

34. Hydrogen bond - van der Waals bond

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

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

37. 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