Level K Grade 9 Science AMS and HW Week 2 Questions 1-64 Physical Science Practice Sheet

4

24. How many significant figures does a measurement of 12.40 cm have? [_]

116.3

33. A glass marble has a mass of 38.76 g. Find the mass of 3 marbles [_______] g (or, if you add 38.76+38.76+38.76= _ANSWER_)

1.0×10²

48. Example: A piece of glass has a width of 8.3 cm and a length of 12.4 cm. What is its area? _______cm²

useful

56. A model may not provide the real truth. It is [_____] as long as it predicts the experimental facts.

scale

58. G When drawing a graph, we should use for each axis a [____] such that the data to be plotted spreads over at least half the range included by the axis.

fit

59. When data is plotted to show points on a graph, if the points appear to be approximately along one straight line, we try to draw the best [___] line, which passes through most of the points and have roughly as many points on one side of it as on the other side.

2.40,2

6. 4.00 min in s (in scientific notation) a×10ⁿ s where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

3.00,1

8. 108 km/h in m/s (in scientific notation) a×10ⁿ m/s where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

one

23. A significant number must always include some 'sure' digits and [___] uncertain digit(s).

c

35. A steel bar was measured to be 213.54 cm long. The number of significant figures in this reading is: a)3, because the last two digits are beyond the decimal point b)2, because the first three digits are before the decimal point c)5 d)6, because there are five digits and a decimal point; all are significant e)Infinite, because all the digits to the left of the '2' in the number are zeros. ONLY WRITE THE LETTER

All

49. A boy tastes five green apples and finds that they all taste sour. A generalization he would make is: [_____] green apples taste sour.

624.5

46. Example: A bottle of sodium carbonate (a chemical) has a mass 624.5 g. A small sample of 0.0363 g was taken out of it. What is the mass of the bottle after the sample was taken out?_________g.

finite,true

50. No [_____] number of experiments can prove a generalization true. A generalization can never be proved [____]. SEPARATE UR ANS W/ COMMA (NO SPACE)

valid

51. A [_____] experimental result is one that can be repeated by others in different places at different times and the same result is obtained. If an experimental result cannot be repeated, then the experiment and its result are not valid.

proved

53. A hypothesis is a generalization, so it can never be [_____] to be correct.

support

54. Experiments test a hypothesis, and the result either prove the hypothesis wrong or they [_______] the hypothesis, but never prove it correct.

model

55. A [_____] is a generalization that explains something we don't understand in terms of something that we do understand.

equation

57. G A mathematical model is an [______] that relates two or more variables in a way that fits all valid data.

119.9

28. A sample of 3.484 g of a powder was removed from a bottle containing 123.4 g the powder. How many grams of the powder are left in the bottle? [_____] g

5.2,5

3. 52×10⁴ in scientific notation is a×10ⁿ where a=[___] and n=[____]. SEPARATE ANSWERS WITH A SINGLE COMMA

between

60. Interpolation is taking a reading from the graph for a point which is [_____] two experimentally determined points.

outside

61. Extrapolation is taking a reading from the graph for a point which is [______] the range of experimentally determined points.

run

62. G The slope of a line at a point is the inclination of the graph at that point and is determined by dividing the rise by the [____].

1.3600,1

10. 13600 kg/m³ in g/cm³ (in scientific notation) a×10ⁿ g/cm³ where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

5.12,-2

11. 512 cm² in m² (in scientific notation) a×10ⁿ m² where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

6.51,5

12. 0.651 m³ in cm³(in scientific notation) a×10ⁿ cm³ where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

5.54×10⁻⁶

13. 5.54 cm³ in m³ (in scientific notation) = ____________m³

2.6×10⁻¹

14. 2.6×10⁻⁴ L in cm³ (in scientific notation) = ____________cm³

3.60×10⁵

15. 360 m³ in L (in scientific notation) = ____________L

3.6×10⁻³

16. 3.6 cm³ in L (in scientific notation) = ____________L

6×10⁻¹

17. 0.00006×10⁻² m³ in cm³ (in scientific notation) = ____________cm³

3.60000×10²

18. 360000 L in m³ (in scientific notation) = ____________m³

4.0,3

19. The volume of a sphere of diameter 20cm is a×10ⁿ cm³ (use π=3.0) a=________ n=________ SEPARATE ANSWERS WITH A SINGLE COMMA

-6

2. 1 ÷ (10×10×10×10×10×10) = 10ⁿ where n=[__]

1.1,2

20. The volume of a cylinder of length 20.8 cm and diameter 2.6 cm is a×10ⁿ cm³ (use π=3.0) a=________ n=________ SEPARATE ANSWERS WITH A SINGLE COMMA

5.4,2,cm³

21. A cylinder of cross sectional area 54.0 cm² and length 10 cm, the volume of the cylinder is a×10ⁿ u, (use π=3.0) a=________ n=________ u=________ SEPARATE ANSWERS WITH A SINGLE COMMA

9.0,0,g/cm³

22. The volume of a copper key is 5.0 cm³, and its mass is 45.0 grams. The density of copper is a×10ⁿ u. a=________ n=________ u=________ SEPARATE ANSWERS WITH A SINGLE COMMA

6.1

30. A ring weighs 5.6 grams. A diamond of weight 0.4823 g is added to it. What is the total mass of the diamond?[___]g

8.91,4

31. A volume of 8.31×10² m³ of water was added to a reservoir which already contains 8.83×10⁴ m³ of water. The total volume of water in the reservoir is a×10ⁿ cm where a=[____] and n=[____] -SEPARATE ANSWERS WITH A SINGLE COMMA

e

41. A stick is 62.4 cm long. A part was cut out of it. The remaining part is 57.2 cm long. How much was cut out of it? a)520 mm b)5.20 cm c)05.20 cm d)52 cm e)5.2 cm ONLY WRITE THE LETTER

a

42. A bottle contains 345 cm³ of oil. A volume of 4.65 cm³ of oil was added to it. What is the volume of oil in the bottle now? a)350 cm³ b)3.5×10² cm³ c)349.65 cm³ d)349.7 cm³ e)340.35 cm³ ONLY WRITE THE LETTER

e

43. A piece of land has a width of 82.5 m and a length of 120.5 m. What is its area? a)994 m² b)9941.3 m² c)9941 m² d)9940 m² e)9.94×10³ m² ONLY WRITE THE LETTER

b

44. A glass marble has a volume of 5.54 cm³. Find the volume of five such marbles. a)27.70 cm³ b)27.7 cm³ c)27 cm³ d)27×10² cm³ e)2.7×10 cm³ ONLY WRITE THE LETTER

3,5,4

45. Example: A line was measured to be 12.35 cm long. How many certain digits does it have? ______. Which is the uncertain, estimated, or unsure digit? _____. How many significant figures does it have? _____

8.94×10⁴

47. Example: A volume of 6.31×10² m³ of water was added to a reservoir which already contains 8.88×10⁴ m³ of water. Find the total volume of water in the reservoir. Answer:_________m³

8.54,1

27. A meter stick measuring exactly 100.0 cm was neatly sliced off a strip of wood measuring exactly 185.4 cm, what is the length of the remaining piece of wood in scientific notation, the length of the remaining piece of wood is a×10ⁿ cm where a=[____] and n=[___]. SEPARATE ANSWERS WITH A SINGLE COMMA

2.34,-1

5. 23.4 cm in m (in scientific notation) a×10ⁿ m where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

valid,valid,false

52. One [_____] test is enough to prove a generalization to be false. If a [____] experience contradicts the generalization it becomes [_____].

y

63. The rise is the change in the variable on [____]-axis, between two selected points on the graph.

x

64. The run in the change in the variable on [___]-axis, between two selected points on the graph.

7.2,1

7. 20 m/s in km/h (in scientific notation) a×10ⁿ km/h where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

7.8,2

9. 0.78 g/cm³ in kg/m³ (in scientific notation) a×10ⁿ kg/m³ where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

4.0012,-1

25. The distance round a track was measured to be 400.12 m. Expressed in km, this measurement is a×10ⁿ where a=[____] and n=[_____] SEPARATE ANSWERS WITH A SINGLE COMMA

infinite,infinite

26. Three teachers accompanied 65 students to the park. How many significant figures are in the measurement of the teachers?[_____] The students?[_____] SEPARATE ANSWERS WITH A SINGLE COMMA

1.380,2

29. Add the two measurements: 1.256×10¹ cm and 1.254×10² cm. Answer is a×10ⁿ cm where a=[____] and n=[____] -SEPARATE ANSWERS WITH A SINGLE COMMA -THE ANSWER IN THE SHEET IS WRONG

1.02,4

32. A piece of glass has a width of 82.3 cm and a length of 123.4 cm. Its area is a×10ⁿ cm where a=[____] and n=[____] -SEPARATE ANSWERS WITH A SINGLE COMMA

d

34. A line was measured to be 23.65 cm long. The number of significant figures in this measurement, and the uncertain digit(s) is/are respectively: a)2&65 b)4&65 c)3&5 d)4&5 e)23&65 ONLY WRITE THE LETTER

c

36. A steel meter stick was measured to be 100.00 cm. How many significant figures does this measurement contain; and what is the smallest division on the measuring scale a)1; a mm b)3; a mm c)5; a mm d)6; a mm e)5; a tenth of a mm ONLY WRITE THE LETTER

d

37. A measurement of 52.73 cm can be written as 0.5273 m or as 0.0005273 km. In each of these forms the number of significant figures in this measurements are: a)4,5, and 8 b)4,5, and 9 c)5,6, and 9 d)4,4, and 4 e)5,5, and 5 ONLY WRITE THE LETTER

c

38. A measurement of 52.3 meter, when changed to centimeters, could be correctly written as: a)52300 cm b)523000 cm c)5.23×10³ cm d)5.23×10⁻⁵ cm e)0.523 cm ONLY WRITE THE LETTER

e

39. How many significant figures, respectively, are in each of these two countable quantities, 3 marbles and 27 table tennis balls: a)1,2 b)1,1 c)2,3 d)0 e)As many as we like ONLY WRITE THE LETTER

2.34,2

4. 0.234 kg in g (in scientific notation) a×10ⁿ g where a=[___] and n=[____] SEPARATE ANSWERS WITH A SINGLE COMMA

a

40. A table 62.4 cm long. Another table is 57.5 cm long. How long will the two tables be if placed lengthwise next to each other? a)119.9 cm b)120 cm c)119 cm d)1.2×10² cm e)119.90 cm ONLY WRITE THE LETTER

3

1. 10×10×10 = 10ⁿ where n=[__]