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

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

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

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

6. Vegetable and meat origin

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

8. The resistance a material offers to penetration of scratching

9. Bond between adjacent oppositely charged ions

10. A substance made of only one element or compound

11. Fixed volume and fixed shape

12. Fixed volume but take the shape of their container

13. Thermosets and thermoplastics

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

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

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

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

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

19. 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

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

21. Hydrogen bond - van der Waals bond

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

23. 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

24. Earthenware - porcelain - stoneware and glass

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

26. The ability of a material to withstand pulling forces

27. A substance that cannot be decomposed into simpler substances

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

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

30. A force of attraction between particles

31. Ferrous and non - ferrous

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. No fixed volume and no fixed shape

34. Natural wood and manmade

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

36. 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.

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