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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. No fixed volume and no fixed shape

2. Vegetable and meat origin

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

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

5. Natural wood and manmade

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

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

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. The resistance a material offers to penetration of scratching

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

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

12. Thermosets and thermoplastics

13. A substance made of only one element or compound

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

15. A force of attraction between particles

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

17. Fixed volume and fixed shape

18. The ability of a material to withstand pulling forces

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

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

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

22. Earthenware - porcelain - stoneware and glass

23. Hydrogen bond - van der Waals bond

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

25. 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

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

28. 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.

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

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

31. Bond between adjacent oppositely charged ions

32. 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)

33. Fixed volume but take the shape of their container

34. A substance that cannot be decomposed into simpler substances

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

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

37. Ferrous and non - ferrous