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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. Earthenware - porcelain - stoneware and glass

2. Bond between adjacent oppositely charged ions

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

4. Thermosets and thermoplastics

5. Ferrous and non - ferrous

6. A force of attraction between particles

7. 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.

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

9. 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)

10. Fixed volume but take the shape of their container

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

12. A substance made of only one element or compound

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

14. Fixed volume and fixed shape

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

16. No fixed volume and no fixed shape

17. Hydrogen bond - van der Waals bond

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

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

20. Natural wood and manmade

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

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

23. 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

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

25. A substance that cannot be decomposed into simpler substances

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

27. The ability of a material to withstand pulling forces

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

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

30. 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)

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

32. Vegetable and meat origin

33. 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

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

35. The resistance a material offers to penetration of scratching

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

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