mrsbohaychuk.weebly.commrsbohaychuk.weebly.com/uploads/4/8/1/8/48187011/sci7... · Web viewB) a dead load can be removed from a structure, a live load is the structure itself C) a

Science 7

Midterm Exam 2019St. Augustine School

Unit D Structures and ForcesUnit A Interactions and Ecosystems

Version 1 Answer Key

You may write on this examRecord your answers on the scantron provided

Unit D Structures and Forces 1. Spider webs are examples of structures that can hold up to 4000 times the weight of the spider that made it. The spider web is a…

A) manufactured frame structure

B) natural shell structure

C) natural frame structure

D) manufactured shell structure

2. All of the following structures can be classified as manufactured EXCEPT…

A) desk

B) spoon

C) feather

D) fishing net

3. When a structure changes shape or size because the material is unable to resist the load acting on it is called…

A) deformation

B) resistance

C) ductility

D) brittleness

4. Containing, sheltering, transporting and lifting all describe a structure’s…

A) design

B) stability

C) function

D) aesthetics

5. Building a structure so that it can support more weight than it is ever likely to have to support is known as…

A) excessive load capacity

B) overkill

C) ultra control

D) margin of safety

6. Which of the following would NOT be an aesthetic consideration for your choice in

buying a car?

A) the airbags and seatbelts

B) what color it has been painted

C) the shape and design of the outside

D) the cleanliness of the vehicle

7. Which of the following best describes adhesives?

A) carefully shaped parts that hold themselves together

B) metal pieces that are melted and fused together

C) sticky substances that flow into tiny cracks on the surface of materials to bind the

surfaces together

D) joining two shapes together using a melted metal that binds the shapes as the

metal cools

8. There are a variety of ways that structures can be joined together. Mobile joints are

items like door hinges, and shoulders where the connected structures can move. Rigid

joints are connections that are not movable. Which examples are representative of

interlocking shapes?

A) staples, nails, screws

B) glue, tape, welded metal

C) shoelaces, woven clothing

D) jars with screw-top lids, pen caps, zippers

9. The mass of a small rock and the mass of an elephant are…

A) very different

B) about the same

C) measured in Newtons

D) able to change

10. What is the approximate gravitational pull on a 1 kg mass?

A) 1 N

B) 10 N

C) 100 N

D) 1000 N

11. Which of the statements is true?

A) Weight can be measured using a triple beam balance

B) the SI unit of force is the kilogram

C) Mass is measured in Newtons

D) Weight is measured with a force meter or spring scale

12. Weight is a force that is measured by the gravitational pull on the object. Which of the following statements is true about weight?

A) It is always heavy

B) It is measured in kg

C) It is the amount of particles

D) It changes depending on which planet you are on

13. The difference between a live and dead load is that...

A) a live load can be removed from a structure, a dead load is the structure itself

B) a dead load can be removed from a structure, a live load is the structure itself

C) a live load is something that is living

D) they are actually the same

14. A structure like a bridge must be strong enough to hold the weight of whatever passes over it. It must also be able to support its own weight. The term used to describe the weight of the materials making up a structure is the…

A) dead load

B) live load

C) force

D) mass

Use the following information to help you answer the next two questions.

15. When the tire swing is not moving, the rope that connects the tire to the tree would experience a ___(i)____ force that ____(ii)____ on the ends of the ropes.

A) tension force, pulls

B) compression force, pulls

C) tension force, pushes

D) compression force, pushes

16. When would the ropes connecting the tire to the tree experience a torsion force?

A) when the tire is being attached

B) when the tire is swinging back and forth

C) when the tire is spinning

D) when the tire moves up and down

--------------------------------------------------------------------------------------------------------------------- 17. Bending or tearing a certain material, by pressing on different parts, in opposite directions, at the same time. The force you are creating is called…

A) tension force

B) shear force

C) torsion force

D) compression force

18. Janine is using a needle and thread to sew a button back onto a shirt. As she pulls on the thread, it breaks. Which statement below about this situation is true?

A) The thread had zero tensile strength

B) The force Janine exerted on the thread was greater than the

thread's tensile strength

C) The force Janine exerted on the thread was less than the


D) The force Janine exerted on the thread was greater than the

thread's load

19. Why would designers use composite materials?

A) They are less expensive

B) They combine the advantages of two weaker materials

C) They look nicer

D) They are always stronger

20. Material fatigue occurs because a material is…

A) not made properly

B) too old to be used anymore

C) exposed to extreme conditions

D) bent or twisted over and over again

21. A frame structure can support a very heavy roof because of one of the principles of design. The supporting posts in the structure visibly demonstrate this principle…

A) distribute the load evenly

B) direct the forces along angled components

C) shape the parts for the forces they are likely to face

D) place lighter materials above heavier materials

Use the following information to help you answer the next question Bob’s fence is old and starting to tilt. He uses braces, as shows in the diagram below to support his fence.

22. The braces work to support the fence by…

A) providing spin stabilization

B) distributing some of the weight of the fence to the ground

C) being a composite material

D) providing compression forces

23. Identify which structure would have the greatest stability due to a low center of gravity?

A) large mass high off the ground and a narrow base

B) large mass high off the ground and a wide base

C) large mass low to the ground and a narrow base

D) large mass low to the ground and a wide base

24. An arch, which is a common shape in bridges, can support large loads. This is possible because…

A) the central keystone carries all of the force itself

B) it is rounded and so the force of gravity is lessened

C) the force of the load is carried down through the rest of the

arch

D) both b and c

25. The cables of a suspension bridge are under?

A) tension

B) torsion

C) compression

D) shear

Unit A Interactions and Ecosystems

26. Which of the following best lists the needs of a wolf?

A) oxygen, habitat, water, trees

B) food, water, grass, oxygen

C) oxygen, habitat, water, food

D) food, oxygen, water, house

27. In an ecosystem, abiotic and biotic factors interact. An example of a biotic

factor in an ecosystem would be

A) rocks, soil, water

B) worms, bacteria

C) air, temperature

D) climate, weather

28. All of the following are examples of wants except for:

A) juice to drink at lunch

B) a phone

C) fancy shoes

D) clean water

29. On a rotting log, a salamander hides under the bark, fungi grows on top, other

forest dwelling organisms use the hollow core as home, and water collects in the

cracks. The rotting log is an example of a/an

A) environment

B) community

C) ecology

D) ecosystem

30. Barnacles are organisms that attach themselves to whales to move throughout the different parts of the ocean. The barnacles are better able to feed as they are carried around, while the whales do not seem to notice the presence of the barnacles. This is an example of ___i___ because ___ii___.

i ii

A mutualism the whale benefits

B commensalism the whale is harmed

C commensalism only the barnacle benefits

D parasitism the barnacle is harmed

31. Tapeworms live inside organisms and feed on the nutrients of the food they eat. As a result, the organism does not get all the nutrients from the food they eat. A tapeworm living in its host is an example of parasitism because… A) both the tapeworm and the organism benefit

B) the tapeworm benefits while the organism is harmed

C) the tapeworm benefits while the organism neither benefits nor is harmed

D) neither the tapeworm nor the organism benefit

Use the following food web to help you answer the next three questions.

32. A ______ is always found at the base or start of the food web because _________. A) decomposer……….they return nutrients to the soil

B) producer……….they use raw materials to produce food that is passed to others

C) producer……….they supply the energy for carnivores

D) herbivore……….they are the first organisms to eat other organisms

33. The mouse is an example of what type of organism?

A) producer

B) herbivore

C) carnivore

D) omnivore

34. What would happen if the grasshopper became extinct?

A) The lizard population would go extinct

B) The hawk population would go extinct

C) The snake population would go extinct

D) The rabbit population would go extinct

35. Two important roles often not shown in food webs are those of scavengers and decomposers. What are the two main roles of scavengers (Role 1) and decomposers (Role 2) in an ecosystem?

Role 1 Role 2

A To break down dead material To absorb carbon dioxide

B To break down dead material To eat herbivores

C To recycle nutrients in an ecosystem

To break down dead material

D To recycle nutrients in an ecosystem

To absorb carbon dioxide

36. An organism that consumes both producers and other consumers is called…

A) a herbivore

B) an omnivore

C) a carnivore

D) prey

37. Which option ranks the members of an ecosystem in the correct order in a pyramid of numbers from highest to lowest?

A) herbivores – producers – carnivores

B) herbivores – carnivores – producers

C) producers – carnivores – herbivores

D) producers – herbivores – carnivores

38. Our ecological footprint determines how much of an impact we have on Earth. It

can be calculated by examining...

A) the amount of energy we use

B) the resources we use and the waste we produce

C) only the amount of waste we produce

D) only the resources we use

39. As part of the hydrologic cycle, water is circulated on land, in the oceans, and into our atmosphere. The process by which water falls from the upper atmosphere in the form of rain, snow, sleet, and hail is called...

A) percolation

B) condensation

C) ground water

D) precipitation

40. Carbon is an important part of an ecosystem; it is necessary for all life to exist. Carbon is used by plants in the process of…

A) respirationB) photosynthesisC) transpirationD) decomposition

41. What is the process called in which water changes phase from a liquid to a gas in plants?

A) condensationB) transpirationC) groundwaterD) precipitation

42. How does acid rain form?

A) people spray pesticides to kill insects

B) people burn fossil fuels which mixes with water in the air

C) people throwing trash into a landfill

D) people dump acidic substances into a lake

43. What is meant by the term biomagnification?

A) the addition of a toxin to the environment by humansB) the storage and elimination of a toxin in organisms at each level of a food chainC) the storage and build-up of a toxin in organisms at each level of a food chainD) the build-up of a toxin over time in the ground

44. Using pesticides that contain DDT was very effective in controlling insect pests on many crops. However, it was later banned because of harmful side effects. Which choice is a reason that pesticides were used?

A) it also killed the insects when they were eating the crops

B) it built up in top predators, reducing their populations

C) it polluted the surrounding waterways

D) it was found to cause health problems in the field workers

45. Succession is a gradual process within an ecosystem in which some species replace other species. An area of bare rock becoming a grassy field and a sunken ship becoming covered with coral are examples of…

A) micro-succession

B) primary succession

C) climax community

D) secondary succession

46. In the 1960s, the Swift Fox numbers were severely decreasing as natural prairie grasslands were turned into farmland. Today, we find very few Swift Foxes in Alberta, but they can be found in Saskatchewan. In the 1960s, the Swift Fox would have been classified as a/an ___i___ species; today it would be classified as a/an ___ii___ species.

A endangered extirpated

B extinct threatened

C extirpated threatened

D threatened extinct

47. What is the main cause of the extinction of organisms? A) habitat loss

B) pesticide use

C) introduction of other species

D) human impact

48. A zebra mussel is a type of aquatic organism that has been brought over from another country and has reproduced on a large scale, becoming a problem in the Great Lakes. From what we have learned ple loosestrife is banned in Alberta, as it can completely take over native grasslands and has no natural enemies. Dandelions are another can ?

A) it tells the scientists what the ecosystem is like in a natural state

B) it helps citizens make decisions about what should be done to an environment

C) it makes scientists aware of how fragile the ecosystem balance is

D) all of the above

49. There are different kinds of practices that help scientists monitor the health of an ecosystem. Which row below correctly matches the description with the type of monitoring it describes?

Chemical Biological

A Landscape Air/water/soil quality

B Air/water/soil quality Landscape

C Landscape Climate

D Air/water/soil quality Changes in populations

50. Understanding human impact on the environment is important because... A) it tells the scientists what we can do to prevent further ecological damage

B) it makes people aware that we need to make a difference in how much waste we

produce

C) then we can see what our effects are, and make better environmental changes

D) all of the above

Science 7



Version 1






D) manufactured shell structure


A) desk

B) spoon

C) feather

D) fishing net


A) deformation

B) resistance

C) ductility

D) brittleness


A) design

B) stability

C) function

D) aesthetics



B) overkill

C) ultra control

D) margin of safety


buying a car?




D) the cleanliness of the vehicle



B) metal pieces that are melted and fused together

C) sticky substances that flow into tiny cracks on the surface of materials to bind the

surfaces together

D) joining two shapes together using a melted metal that binds the shapes as the

metal cools







C) shoelaces, woven clothing

D) jars with screw-top lids, pen caps, zippers


A) very different

B) about the same


D) able to change


A) 1 N

B) 10 N

C) 100 N

D) 1000 N




C) Mass is measured in Newtons

D) Weight is measured with a force meter or spring scale


A) It is always heavy

B) It is measured in kg

C) It is the amount of particles

D) It changes depending on which planet you are on




C) a live load is something that is living

D) they are actually the same


A) dead load

B) live load

C) force

D) mass






D) compression force, pushes



B) when the tire is swinging back and forth

C) when the tire is spinning

D) when the tire moves up and down


A) tension force

B) shear force

C) torsion force

D) compression force







D) The force Janine exerted on the thread was greater than the

thread's load




C) They look nicer

D) They are always stronger


A) not made properly

B) too old to be used anymore

C) exposed to extreme conditions

D) bent or twisted over and over again



B) direct the forces along angled components

C) shape the parts for the forces they are likely to face

D) place lighter materials above heavier materials






D) providing compression forces


A) large mass high off the ground and a narrow base

B) large mass high off the ground and a wide base

C) large mass low to the ground and a narrow base

D) large mass low to the ground and a wide base



B) it is rounded and so the force of gravity is lessened


arch

D) both b and c


A) tension

B) torsion

C) compression

D) shear






D) food, oxygen, water, house



A) rocks, soil, water

B) worms, bacteria

C) air, temperature

D) climate, weather


A) juice to drink at lunch

B) a phone

C) fancy shoes

D) clean water




A) environment

B) community

C) ecology

D) ecosystem


i ii


B commensalism the whale is harmed

C commensalism only the barnacle benefits

D parasitism the barnacle is harmed



C) the tapeworm benefits while the organism neither benefits nor is harmed

D) neither the tapeworm nor the organism benefit




C) producer……….they supply the energy for carnivores

D) herbivore……….they are the first organisms to eat other organisms


A) producer

B) herbivore

C) carnivore

D) omnivore



B) The hawk population would go extinct

C) The snake population would go extinct

D) The rabbit population would go extinct


Role 1 Role 2





D To recycle nutrients in an ecosystem

To absorb carbon dioxide


A) a herbivore

B) an omnivore

C) a carnivore

D) prey



B) herbivores – carnivores – producers

C) producers – carnivores – herbivores

D) producers – herbivores – carnivores






D) only the resources we use


A) percolation

B) condensation

C) ground water

D) precipitation


A) respirationB) photosynthesisC) transpirationD) decomposition


A) condensationB) transpirationC) groundwaterD) precipitation





D) people dump acidic substances into a lake


A) the addition of a toxin to the environment by humansB) the storage and elimination of a toxin in organisms at each level of a food chainC) the storage and build-up of a toxin in organisms at each level of a food chainD) the build-up of a toxin over time in the ground





D) it was found to cause health problems in the field workers


A) micro-succession


C) climax community

D) secondary succession





D threatened extinct


B) pesticide use

C) introduction of other species

D) human impact




C) it makes scientists aware of how fragile the ecosystem balance is

D) all of the above


Chemical Biological


B Air/water/soil quality Landscape

C Landscape Climate

D Air/water/soil quality Changes in populations


B) it makes people aware that we need to make a difference in how much waste we

produce

C) then we can see what our effects are, and make better environmental changes

D) all of the above

Science 7



Version 2 Answer Key







A) desk

B) feather

C) fishing net


A) deformation

B) resistance

C) brittleness


A) stability

B) function

C) aesthetics



B) ultra control

C) margin of safety


buying a car?






B) sticky substances that flow into tiny cracks on the surface of materials to bind the

surfaces together

C) joining two shapes together using a melted metal that binds the shapes as the

metal cools







C) jars with screw-top lids, pen caps, zippers


A) very different

B) about the same



A) 1 N

B) 10 N

C) 100 N




C) Weight is measured with a force meter or spring scale


A) It is measured in kg

B) It is the amount of particles

C) It changes depending on which planet you are on




C) they are actually the same


A) dead load

B) live load

C) mass








B) when the tire is spinning

C) when the tire moves up and down


A) tension force

B) shear force

C) compression force










C) They look nicer


A) too old to be used anymore

B) exposed to extreme conditions

C) bent or twisted over and over again



B) shape the parts for the forces they are likely to face

C) place lighter materials above heavier materials







A) large mass high off the ground and a wide base

B) large mass low to the ground and a narrow base

C) large mass low to the ground and a wide base



B) it is square and so the force of gravity is lessened


arch


A) tension

B) torsion

C) compression








A) worms, bacteria

B) air, temperature

C) climate, weather


A) a phone

B) fancy shoes

C) clean water




A) community

B) ecology

C) ecosystem


i ii


B commensalism only the barnacle benefits

C parasitism the barnacle is harmed



C) neither the tapeworm nor the organism benefit




C) herbivore……….they are the first organisms to eat other organisms


A) producer

B) herbivore

C) carnivore



B) The snake population would go extinct

C) The rabbit population would go extinct


Role 1 Role 2






A) a herbivore

B) an omnivore

C) a carnivore



B) producers – carnivores – herbivores

C) producers – herbivores – carnivores







A) condensation

B) ground water

C) precipitation


A) respirationB) photosynthesisC) transpiration


A) condensationB) transpirationC) precipitation






A) the addition of a toxin to the environment by humansB) the storage and elimination of a toxin in organisms at each level of a food chainC) the storage and build-up of a toxin in organisms at each level of a food chain






A) micro-succession


C) secondary succession






B) introduction of other species

C) human impact




C) all of the above


Chemical Biological


B Landscape Climate

C Air/water/soil quality Changes in populations


B) then we can see what our effects are, and make better environmental changes

C) all of the above

Science 7Midterm Exam 2019

St. Augustine School


Version 2







A) desk

B) feather

C) fishing net


A) deformation

B) resistance

C) brittleness


A) stability

B) function

C) aesthetics



B) ultra control

C) margin of safety


buying a car?






B) sticky substances that flow into tiny cracks on the surface of materials to bind the

surfaces together

C) joining two shapes together using a melted metal that binds the shapes as the

metal cools







C) jars with screw-top lids, pen caps, zippers


A) very different

B) about the same



A) 1 N

B) 10 N

C) 100 N




C) Weight is measured with a force meter or spring scale


A) It is measured in kg

B) It is the amount of particles

C) It changes depending on which planet you are on




C) they are actually the same


A) dead load

B) live load

C) mass








B) when the tire is spinning

C) when the tire moves up and down


A) tension force

B) shear force

C) compression force










C) They look nicer


A) too old to be used anymore

B) exposed to extreme conditions

C) bent or twisted over and over again



B) shape the parts for the forces they are likely to face

C) place lighter materials above heavier materials







A) large mass high off the ground and a wide base

B) large mass low to the ground and a narrow base

C) large mass low to the ground and a wide base



B) it is square and so the force of gravity is lessened


arch


A) tension

B) torsion

C) compression








A) worms, bacteria

B) air, temperature

C) climate, weather


A) a phone

B) fancy shoes

C) clean water




A) community

B) ecology

C) ecosystem


i ii


B commensalism only the barnacle benefits

C parasitism the barnacle is harmed



C) neither the tapeworm nor the organism benefit




C) herbivore……….they are the first organisms to eat other organisms


A) producer

B) herbivore

C) carnivore



B) The snake population would go extinct

C) The rabbit population would go extinct


Role 1 Role 2






A) a herbivore

B) an omnivore

C) a carnivore



B) producers – carnivores – herbivores

C) producers – herbivores – carnivores







A) condensation

B) ground water

C) precipitation


A) respirationB) photosynthesisC) transpiration


A) condensationB) transpirationC) precipitation






A) the addition of a toxin to the environment by humansB) the storage and elimination of a toxin in organisms at each level of a food chainC) the storage and build-up of a toxin in organisms at each level of a food chain






A) micro-succession


C) secondary succession






B) introduction of other species

C) human impact




C) all of the above


Chemical Biological


B Landscape Climate

C Air/water/soil quality Changes in populations


B) then we can see what our effects are, and make better environmental changes

C) all of the above

Documents

mrsbohaychuk.weebly.commrsbohaychuk.weebly.com/uploads/4/8/1/8/48187011/sci7... · Web viewB) a dead load can be removed from a structure, a live load is the structure itself C) a