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Science test Flashcards

1
Q

What is a projection?

A

A projection is a representation of a 3D object on a 2D surface.

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2
Q

What are the 2 projections that are used to represent an object in 3D?

A

Oblique and Isometric projections

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3
Q

In which projection are visual lines perpendicular to the paper?

A

Isometric projection

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4
Q

What does oblique mean?

A

Neither parallel nor at a right angle to a specified or implied line; slanting.

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5
Q

True or false:

Oblique and isometric projections are not 3D.

A

False

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6
Q

What’s a multiview projection?

A

A multiview projection is a 2D representation of one of the sides of an object.

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7
Q

What are the most necessary views to get an accurate representation of the details of an object?

A

Top, front, right side.

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8
Q

What view shows the various parts of the object separated from each other?

A

An exploded view.

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9
Q

What’s the function of an object line?

A

Shows visible details.

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10
Q

What’s the function of a hidden line?

A

It shows hidden detail.

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11
Q

What’s the function of a dimension line?

A

It shows a dimension.

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12
Q

What’s the function of an extension line?

A

It shows the start and the finish of measurement.

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13
Q

What’s the function of center and symmetry lines?

A

They show the center of a circle from the side view.

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14
Q

What’s a full size scale used for?

A

It’s used to show the actual measurements of the objects.

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15
Q

What’s a reduction scale used for?

A

It’s used to show a large object on a paper.

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16
Q

What’s an enlargement scale used for?

A

It’s used to show a small object on paper.

17
Q

What would a full size scale look like?

A

1:1

18
Q

What would a reduction scale look like?

A

1:2

19
Q

What would an enlarged scale look like?

A

3:1

20
Q

What’s tension?

A

A pulling force.

21
Q

What’s compression?

A

A squeezing force.

22
Q

What’s torsion?

A

A twisting force.

23
Q

What’s deflection?

A

A bending force.

24
Q

What’s Shearing?

A

A cutting force.

25
Q

What does the property HARDNESS do?

A

It has the ability to resist denting or scratching.

26
Q

What does the property RIGIDITY do?

A

It has the ability to resist deformation.

27
Q

What does the property RESILIENCE do?

A

It has the ability to resist impact.

28
Q

What does the property MALLEABILITY do?

A

It has the ability to be flattened into a sheet. (easily shape)

29
Q

What does the property BRITTLENESS do?

A

It’s the opposite of resilience.

30
Q

What does the property DUCTILITY do?

A

It has the ability to be stretched out into wire.

31
Q

What does the property ELASTICITY do?

A

Ability to return to original shape.

32
Q

What does the property ELECTRICAL CONDUCTIVITY do?

A

Allows an electrical current to flow. (Opposite: insulator)

33
Q

What does the property THERMAL CONDUCTIVITY do?

A

It allows thermal energy through.

34
Q

What does the property CORROSION RESISTANCE do?

A

Ability to resist rusting.

35
Q

What are some examples of modified woods?

A

Particle board
Fiber board
Plywood

36
Q

Explain what modified woods are.

A

Modified wood is a generic term that describes the application of chemical, physical, or biological methods that are used to alter the cellular structure of the wood.

37
Q

What are the 2 types of woods?

A

Hardwood and softwood

38
Q

What type of a tree is hardwood?

A

Deciduous trees because they are leafy. They are used to make floors and furniture.

39
Q

What type of a tree is softwood?

A

Coniferous trees because they are evergreen and they are used outdoor for deck/furniture.

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