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Science 8 Final 2022 A1

Posljednje ažuriranje 4 months ago

63 questions

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Pitanje 17

17.

A pipeline pig is a special unit operating in a pipeline to...

A clean the pipeline when it is empty

B monitor the pressure of the gas in the pipeline

C clean the pipeline while being pushed by the gas

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Pitanje 53

53.

The church key was the first practical design for opening a can. It was a simple machine that multiplied the force needed to open the can. The simple machine it was designed after was the ...

A wedge

B 3rd class lever

C 1st class lever

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Pitanje 1

1.

What part is this?

Pitanje 2

2.

Name this part?

Pitanje 3

3.

Name this part?

Pitanje 4

4.

Name this part?

Pitanje 5

5.

Name this part?

Pitanje 6

6.

Name this part?

Pitanje 7

7.

Name this part?

Pitanje 8

8.

Name this part?

Pitanje 9

9.

A hazard symbol that is a red Octagonal shape means...

A compressed gas

B warning

C danger

Pitanje 10

10.

Which of the following is considered a poor safety practice?

A Washing your hands thoroughly with soap and water at the end of each lab period

B Wearing gloves when working with hazardous chemicals

C Removing your safety goggles when recording the data in your lab report

Pitanje 11

11.

Use the WHMIS symbols to answer the following question.
Symbol 4 above indicates ...

A bio-hazardous infectious material

B oxidizing material

C immediate, seriously toxic effects

Pitanje 12

12.

Which of the following is not a homogeneous mixture?

A Milk

B Soda Pop

C Chocloate Chip Cookie

Pitanje 13

13.

You are making a drink using drink crystals. Which statement below is correct?

A The crystals are the solute and the water is the solvent.

B The water is the solute, and the crystals are the solvent.

C The crystals are the solution and the water is the solute.

Pitanje 14

14.

Solubility is the...

A maximum amount of solvent dissolved at a given temperature

B maximum amount of a solute dissolved in a fixed volume of solvent at a given temperature

C minimum temperature that a solute must be in order to dissolve all of a given solvent

Pitanje 15

15.

Particles move the slowest in a...

A cold solid

B cold gas

C hot solid

Pitanje 16

16.

You are cleaning your bike and want to clean the bearings. They are covered in grease. The best substance to use to clean the bearings will be...

A water

B a solvent that WILL NOT dissolve the grease

C a solvent that WILL dissolve the grease

Pitanje 18

18.

A detergent is a substance that can remove dirt from different kinds of fabric. The cleaning agent in the detergent attaches itself to the dirt particles. It is called a/an...

A detergent

B suspension

C surfactant

Pitanje 19

19.

Syncrude originally used conveyor belts to move the oil sand from the mine to the processing plant, but it proved to be very expensive to continue operating in this way. They now use ...

A a slurry pipeline

B transport trucks

C very large bulldozers

Pitanje 20

20.

When comparing concentrations of different solutions, it is necessary to compare the
concentrations in the same volume. Which of the following solutions would have the highest
concentration?

A 5.6g per 10ml

B 12g per 25ml

C 25g per 50ml

Pitanje 21

21.

In a hydraulic lift model built by an apprentice (like the real one shown in the illustration below), a pedal is used to push down the large piston, while the small piston lifts up a load. The apprentice's model didn't work. What is wrong with it?
REAL HYDRAULIC LIFT

A The pistons should have the same diameter.

B The load should be on the larger piston.

C Both pistons should be smaller.

Pitanje 22

22.

Which is not a structural adaptation?

A A duck's webbed feet for swimming

B A gibbon's long arms for grasping

C A Canada goose flying south for the winter

Pitanje 23

23.

Adaptation is a change in the organism that allows it to survive in its environment. There are two types of adaptations. Structural adaptations enable organisms to change their appearance, whereas, behavioral adaptations enable organisms to change their behavior. Which of the
following adaptations is behavioral?

A birds fly south

B cactus has spines

C giraffes have long necks

Pitanje 24

24.

Darwin’s finches have different variations in bill size that account for their feeding pattern. A warbler-like finch long sharp pointed bill would have this type of bill because it eats ...

A berries on bushes

B fruit found in tall trees

C insects hiding in the bark of trees

Pitanje 25

25.

The powerhouse of the cell (the part where energy is converted into the usable form) is called the...

A mitochondria

B nucleus

C cytoplasm

Pitanje 26

26.

If a cell has chloroplasts, it is a/an ...

A real cell

B animal cell

C plant cell

Pitanje 27

27.

Peristalsis in the alimentary canal is caused by the ...

A contraction of muscle layers

B action of digestive enzymes

C stretching of the mucosa

Pitanje 28

28.

The largest organ in the human body is the skin, which is also called the Integumentary System. It has two functions, which are ...

A waste removal and transportation of nutrients

B protection and sensory awareness

C movement and protection

Pitanje 29

29.

Organs work together to make a system or network that performs a specialized function. Plants have only two main systems. They are the ...

A stems and the leaves

B roots and the leaves

C shoot and the roots

Pitanje 30

30.

Which statement is correctly associated with the circulatory system?

A Arteries carry blood to the heart.

B The right side pumps blood directly to the lungs.

C The main function of red blood cells is to carry carbon dioxide to the cells.

Pitanje 31

31.

Oxygen-rich air is drawn into the lungs through tube-like passageways called bronchi. The bronchi are lined with tough connective tissue in order to ...

A keep the walls from collapsing

B expand the surface area

C extend the life of the bronchi

Pitanje 32

32.

Capillaries have two adaptations for exchanging gases and nutrients: they are made of specialized epithelial tissue that is only one cell thick and they ...

A are reinforced with a double membrane

B can reverse the flow of gases when they need to

C are very narrow, so the blood cells have to pass through in single file

Pitanje 33

33.

The liver is a very important organ in the excretory system. The function of this organ is to
convert a highly toxic substance into a less harmful substance. The highly toxic substance that is converted into urea in the excretory system is ...

A hydrochloric acid

B ammonia

C sodium chloride

Pitanje 34

34.

A neuron receives messages from small branches of the nerve cell called ...

A dendtrites

B interneurons

C somatic nerve

Pitanje 35

35.

In the late 1700’s, Edward Jenner, an English country doctor, developed the first vaccine. The vaccine he developed made people immune to smallpox. This vaccine was ...

A insulin

B rabies

C cowpox

Pitanje 36

36.

Louis Pasteur was originally a chemist. His first great discovery was finding out what made beer and wine spoil. He discovered micro-organisms, floating in spoiled batches of beer and wine. The micro-organisms were ...

A spoiled grapes

B yeast

C anthrax

Pitanje 37

37.

A simple machine is called a simple machine because it is...

A easy to operate

B complex to operate

C made of one basic machine

Pitanje 38

38.

Mechanical systems for transporting water were developed by Roman engineers thousands
of years ago. These systems supplied water to cities that were many kilometers from the water supply. The systems were known as ...

A sakais

B aqueducts

C mill wheels

Pitanje 39

39.

A simple machine that converts rotational motion to linear motion is called ...

A Class 1 Lever

B Screw

C Wedge

Pitanje 40

40.

The penny farthing was an early bicycle design that used only these types of simple machines ...

A Incline plane & Screw

B Levers and pulleys

C Levers & wheel and axle

Pitanje 41

41.

Linkages and transmissions are parts of a system that perform a specific function. The function they perform is to ...

A increase torque

B increase speed

C transfer force

Pitanje 42

42.

A disadvantage of a wedge is...

A you must exert a force over a greater distance than the load

B you must move the load over a greater distance

C it can only be used in one direction

Pitanje 43

43.

A gear train is a...

A series of different-sized gears working together

B special gear designed for use in trains

C driving gear

Pitanje 44

44.

Gears are used in combination, with the teeth of the gears interlocking, so when one moves the other moves as well. Effort can be applied to the first gear (24 teeth), with the resulting effect on the second gear (12 teeth) being a ...

A speed advantage of 0.5

B speed advantage of 2

C force advantage of 2

Pitanje 45

45.

The mechanical advantage of a device refers to...

A the amount of energy that is used in the device

B the amount of energy that is saved in the device

C the multiplication of the force in the device

Pitanje 46

46.

What is the Mechanical Advantage of this pulley?

A 16

B 5

C 4

Pitanje 47

47.

You have a pulley system, which has an input force of 45 N and an output force of 245 N. What is the mechanical advantage?

A 200

B 5.4 N²

C 5.4

Pitanje 48

48.

If a machine is only 30% efficient, it means that...

A 30% of energy is lost

B 70% of energy is lost

C 70% of energy is converted into unusable energy

Pitanje 49

49.

How much work would a student do if he picked up an 80 N box up off the floor and carried it to a height of 1.0 m then carried it 20 m and placed it on a shelf 1.8 m above the floor? (W = F x d)

A 80 J

B 144 J

C 224 J

Pitanje 50

50.

Speed Ratio is calculated by dividing the ...

A Output distance by the input distance

B Input distance by the output distance

C Output force by the input distance

Pitanje 51

51.

The Mechanical Advantage of this Hydraulic lift is 10 N. What is the area of the output piston if the diameter of the input piston is 1.4 m?
Use this formula on ratios given the information in the question.

A 0.14 m²

B 14.0 m²

C 1.4 m²

Pitanje 52

52.

Mechanical devices are evaluated so that the consumer who will use them can make a better choice. Another important reason to carefully evaluate a mechanical device is too...

A determine how it can be improved

B lower its cost

C make it more fashionable

Pitanje 54

54.

CSA is a non-government association that tests and approves a wide range of products to ensure they are safe for use by the consumer. CSA stands for ...

D Canadian Standards Association

Pitanje 55

55.

Sometimes a new device is designed when someone who thinks there can be an easier way to do something makes an observation. An inventor observed a driver manually cleaning snow and ice off the windshield of a streetcar in freezing cold weather, this observation prompted the invention of this ...

A windshield heater

B windshield washer

C windshield wiper

Pitanje 56

56.

Improvements in robot technology came as a result of industry trying to ...

A Improve the assembly of consumer products

B Improve the margin of safety in all products

C Replace workers because of high wages

Pitanje 57

57.

The Precipitation and Temperature information in the table above identifies a Canadian city. From the data, you might be able to infer that this data represents the City of ...

A Calgary

B Winnipeg

C Halifax

Pitanje 58

58.

Your inference in the question above is based on the fact that ...

A There are extreme periods of precipitation indicating it is located in the Prairies

B There are few extremes in temperature indicating it is by a large body of water

C Its highest temperature indicates that it might be near the Great Lakes

Pitanje 59

59.

A reservoir is...

A an underground river

B a small natural lake

C an artifical lake

Pitanje 60

60.

The term "water quality" is associated with drinking water. All the following are abiotic characteristics
associated with water quality except...

A organisms

B organic matter

C minerals

Pitanje 61

61.

Which of the following statements would be a result of hard water?

A Soap bubbles do not form easily and calcium scale builds up in pipes.

B Soap bubbles do not form easily and scale is absent from pipes.

C Soap bubbles form easily and scale is absent from pipes.

Pitanje 62

62.

Use the following information to answer the question.
Carbon dioxide dissolved in water is acidic. Bromothymol blue is an acid/base indicator. A contaminated water sample is placed into a container containing some bromothymol blue. Another sample of pure water is placed into a similar container containing bromothymol blue. Both
containers were sealed and allowed to remain at room temperature, undisturbed, and in a darkened container for 24 h.
What would be a valid prediction for this experiment?

A Living organisms will use up the oxygen causing the water to turn blue.

D Living organisms will give off carbon dioxide causing the water to turn yellow.😀

Pitanje 63

63.

Distillation of water involves which of the following changes?

A boiling and freezing

B boiling and condensing

C condensing and freezing