mdawe.weebly.com · Web viewJill’s breathing rate at rest is 15 breaths per minute. Her heart rate at rest is 60 beats per minute. After Jill runs several laps around the gym, what

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DO NOT OPEN THE EXAMINATION PAPER UNTILYOU ARE TOLD BY THE SUPERVISOR TO BEGIN

Grade 8 ScienceFINAL EXAMINATION

June 2013Value: 60 Marks

General Instructions

This examination consists of three parts. All parts are contained in this booklet and further instructions are provided on appropriate pages.

Part I – Multiple Choice (35 Marks)Select the letter of the correct response from those provided and place the letter in the blank provided on your multiple choice answer sheet.

Part II – Constructed Response (15 Marks)Answer ALL questions fully and concisely in the space provided.

Part III - Scientific Literacy (10 Marks)Answer ALL questions fully and concisely in the space provided.

Student Checklist

The items below are your responsibility. Please ensure that they are completed.

□ Write your name and teacher’s name on the top of this page.

□ Check the exam to see that there are no missing pages (13 pages in total).

ALL MATERIALS MUST BE PASSED IN WITH THIS EXAM. Use your time wisely. Good luck!

Formulae:

D=mv P= FA

Part I - Total Value 35 Marks

Instructions: Place the letter of the correct answer on the answer sheet provided.

1. Which letter represents the evaporation of water?

(A) W(B) X(C) Y(D) Z

2. Which best describes the salinity of ocean water compared to fresh water?

(A) Fresh water has a lower salinity.(B) Fresh water has no salinity.(C) Ocean water has a lower salinity.(D) They have the same salinity.

3. Which would be the result of climate change?

4. Which term describes the vertical motion of water in the ocean?

(A) acidity(B) pollution(C) turbidity(D) upwelling

5. Which sea floor structure will be most affected by underwater plate tectonics?

(A) A(B) B(C) C(D) D

Grade 8 Science Final Exam - June 2013 Page 2

Amount of Sea Ice at the North Pole

Temperature of Earth’s Atmosphere

(A) decreasing decreasing(B) decreasing increasing(C) increasing decreasing(D) increasing increasing

6. Which underwater technology uses sound waves to map the ocean floor?

(A) diving(B) satellites(C) sonar(D) submersibles

7. Which has the biggest effect on ocean tides?

(A) currents(B) moon(C) sun(D) waves

8. Convection impacts weather. Which best describes the processes occurring at points A and B?

9. Which is correct about local currents and their effect of Newfoundland’s climate?

10. Which will increase because of El Ni~no?

(A) marine productivity(B) ocean temperature(C) trade winds(D) upwelling


A B(A) cooler air rises warmer, denser air replaces it(B) cooler air rises warmer, less dense air replaces it(C) warmer air rises cooler, denser air replaces it(D) warmer air rises cooler, less dense air replaces it

Labrador Current Gulf Stream Effect(A) cold water from North warm water from South decreased fog(B) cold water from North warm water from South increased fog(C) warm water from North cold water from South decreased fog(D) warm water from North cold water from South increased fog

11. Which characteristic of the Particle Theory of Matter describes a gas?

(A) definite volume(B) indefinite shape(C) particles are close together(D) particles vibrate in position

12. Why should roads in Newfoundland be paved during the summer months?

13. What happens to your weight and mass as you travel from the Earth to the Moon?

14. Which explains why the duck floats?

(A) buoyancy(B) mass(C) pressure(D) weight

15. A filing cabinet weighing 500 N exerts a pressure of 650 Pa. What is the area of floor covered by the filing cabinet?

(A) 0.77 m2

(B) 1.3 m2

(C) 1150 m2

(D) 325 000 m2

16. Which statement is true when you squeeze the bottom of a full tube of toothpaste?

(A) The force applied is not transmitted through the toothpaste in the tube.(B) The force applied is only transmitted to toothpaste at the bottom of the tube.(C) The force applied is only transmitted to toothpaste at the top of the tube.(D) The force applied is transmitted equally to all toothpaste in the tube.


Temperature Viscosity of Asphalt

(A) decreases decreases(B) decreases increase(C) increases decreases(D) increases increases

Weight Mass(A) changes changes(B) changes stays the same(C) stays the same changes(D) stays the same stays the same

17. What will happen to an aerosol hairspray can if it is heated?

(A) The can will compress.(B) The pressure in the can will decrease(C) The pressure in the can will increase.(D) There is no effect on the can.

18. Which property of visible light means that light separates into all of the colours of the rainbow?

(A) dispersion(B) reflection(C) travels through transparent materials(D) travels through a vaccuum

19. In the visible spectrum, violet has the highest frequency. Assuming all of the choices below are waves from the visible spectrum, which wave represents violet?

(A)

(B)

(C)

(D)

20. Which form of electromagnetic radiation is used to kill cancer cells?

(A) gamma rays(B) infrared(C) radio waves(D) ultraviolet

21. Which letter represents the angle of reflection?



22. You cannot see your reflection in a piece of paper. This is an example of which characteristic of light?

(A) diffuse reflection(B) light dispersion(C) light refraction(D) specular reflection

23. Which is an example of a convex mirror?

(A) bathroom mirror(B) inside of a metal spoon(C) car rear-view mirror(D) safety mirror on a bus

24. The diagram below shows an object in front of a plane mirror. Which would be true of the image?

(A) Orientation is inverted.(B) Position is the same.(C) Size is larger.(D) Type is real.

25. An object is reflected in a mirror as shown. Which describes the image?

26. Which would be the BEST estimate for the angle of refraction?


Image Size(A) real bigger than object(B) real smaller than object(C) virtual bigger than object(D) virtual smaller than object

(A) 20o

(B) 30o

(C) 40o

(D) 50o

27. What happens to light rays that pass through a convex lens?

(A) They are absorbed.(B) They converge.(C) They diverge.(D) Some diverge, some converge.

28. A bear cub develops into an adult bear. What characteristic of life is this an example of?

(A) growth(B) movement(C) reproduction(D) response to stimuli

29. Which letter represents the part of the microscope that is used to magnify an object?


30. Which letter points to mitochondria?

(A) W(B) X(C) Y(D) Z

31. Which statement is true when comparing plant and animal cells?


Z

Y

X

W

D

C

B

A

(A) Only animal cells have cell walls.(B) Only plant cells have chloroplasts.(C) Plant and animal cells have cells walls.(D) Plant and animal cells have chloroplasts.

32. Which organ system consists of the brain, spinal cord, and sense organs?

(A) digestive(B) excretory(C) muscular(D) nervous

33. Sugar gets broken down in the body to provide energy. What organ system is responsible for this process?

(A) circulatory(B) digestive(C) nervous(D) respiratory

34. Based on the graph, which person is LEAST likely to exercise regularly?


35. Jill’s breathing rate at rest is 15 breaths per minute. Her heart rate at rest is 60 beats per minute. After Jill runs several laps around the gym, what would be the most likely values for her breathing rate and heart rate?


Breaths per Minute

Heart Beats per Minute

(A) 10 50(B) 15 60(C) 20 60(D) 25 70

Part II -Total Value 15 marks

Instructions: Complete all items in this section. Your responses should be well organized and clearly presented.

41. a) Explain two factors that have helped form the sea arch shown. (2 marks)

b) The government of NL wants to build three new cod farms on the South Coast to help ocean cod stocks repopulate. Do you agree or disagree with the government’s plan to use aquaculture? Give 2 reasons to support your answer. (2 marks)

42. a) A 300 g apple is placed in a beaker that contains 500 mL of water. The level of water in the beaker increases to 700 mL. What is the density of the

apple? Show all workings. (2 marks)


b) A 100 kg man sinks when he is thrown in the water. When he wears a 1 kg life jacket he stays afloat. Explain how this is possible. (2 marks)

43. a) (i) For the concave mirror below, construct a ray diagram and draw the image. Use a ruler and draw as neatly as possible. (2 marks)

(ii) Is the image real or virtual? ______________ (0.5 marks)

Is the image upright or inverted? ______________ (0.5 marks)


b) On the show “Survivor”, a new contestant uses a spear to go fishing but he can never hit a fish in water. Using the concept of refraction, explain why the spear fisherman keeps missing the fish. You may choose to use a diagram to help explain your answer. (2 marks)

44. John is training for the track and field team and runs 5 km each day. Explain how the circulatory and respiratory systems work together to improve John’s fitness. (2 marks)


Part III - Total Value 10 Marks

Answer all questions in the space provided.

Quaker State Of Mind

45. Bob tested the flow rate of the 3 oils and graphed the results shown below.

a. Which oil is a solid at room temperature (about 20 ℃)? (1 mark)

b. Which oil has the lowest viscosity at 50 ℃ ? (1 mark)

c. Estimate the flow rate of Oil Y if the temperature is 65 ℃ ? (1 mark)

d. In order to protect car engines best during the winter, oil should have a low viscosity. Bob wants to go to an area where the temperature is below freezing. He performed an experiment where he dropped three identical steel balls into the three different types of oils at a temperature of -5 ℃. Which oil should Bob use? Justify your answer. (2 marks)


CBA

Green Jeans46. Making a typical pair of blue jeans requires a lot of water. It takes about 60

bathtubs of water to grow and dye the cotton used for the blue jeans. That’s why Levi Strauss, the company that invented jeans, is working to reduce the water consumption of their products. The company is helping farmers develop water-saving irrigation practices for cotton crops, they are encouraging consumers to wash their jeans less often, and they have developed a process to create a worn-in look by tumbling jeans with rocks without using the water. They have produced 12 million pairs of jeans that have saved 156 million litresof water using these practices.

a. Why is it important for a company like Levi Strauss to reduce the amount of water used to produce a pair of jeans? (2 marks)

b. The amount of water required to produce a given item is called its water footprint. If ittakes 3000 L of water to produce a sweater, which product has a water footprint about 5 times larger than the sweater? (1 mark)

c. Imagine that in order to reduce the water footprint of Canada, the government decides to ban all beef production. You have been hired to defend the government’s decision to ban beef production. Justify the government’s position with two (2) reasons. (2 marks)


Rice (1 kg) Cotton Shirt

Jeans Beef (1 kg)0

2000400060008000

10000120001400016000

Water Footprint

Product

Wat

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mdawe.weebly.com · Web viewJill’s breathing rate at rest is 15 breaths per minute. Her heart rate at rest is 60 beats per minute. After Jill runs several laps around the gym, what