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МЕТОДИЧКА 1 курс Корсун, Самусенко.doc
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3. Choose the proper example.

1. The ability of a material to take deformation without breaking is known as ….

a)

ductility

b)

cracking

c)

boiling

d)

plasticity

2. Strength of metals is the property of hard materials to be subjected to the influence of ……. forces without changing their shape.

a)

internal

b)

big

c)

external

d)

short

3. If a material is brittle, it will not …shocks or bending without fracture.

a)

withstand

b)

melt

c)

withstands

d)

melts

4. Many materials become more plastic when……..

a)

frozen

b)

watered

c)

heated

d)

cooled

5. Strong materials can withstand force without……..

a)

leaving

b)

going

c)

taking

d)

breaking

6. … is the property of the material to deform when it is subjected to stress over long periods.

a)

feature

b)

creep

c)

strength

d)

humidity

7. Elasticity is ….. to plasticity.

a)

opposite

b)

similar

c)

like

d)

road

8. Most metals are good conductors of ……. and electricity.

a)

tools

b)

hot

c)

hard

d)

heat

4. Fill in the gaps using sentences from the text:

  1. Most materials become more plastic when…

  2. …to withstand force without breaking or permanently bending.

  3. Wood is particularly… and tends to warp and twist with changes in humidity.

  4. Repeated bending will cause …of some materials to break down.

  5. Ductility is the ability to undergo cold plastic deformation by…or …

  6. Structures such as bridges and tall building must have a degree….

  7. A brittle material will not …or bending …fracture.

  8. …cause material to become stressed.

5. Find out which statements are true (t) or false (f). Correct mistakes:

  1. Plastic materials are very prone to corrosive effects.

  2. Elasticity is the important property of cutting tools such as turning tools, drills, files and saws.

  3. Stability is the ability to resist changes in shape and size over time.

  4. Hardness is the ability to bend and flex.

  5. Strength is the ability to resist abrasive wear, indentation and deformation.

  6. Many materials become more plastic when frozen..

  7. Brittleness is the ability of material to withstand shocks and bending without fracture.

  8. Strong materials can withstand force without breaking or permanently bending.

  9. Toughness is the synonym to brittleness.

  10. Metals tend to gradually deform when subjected to stress over long period.