Materie plastiche
Quiz
•
Instructional Technology
•
6th Grade
•
Practice Problem
•
Medium
Giovanna Ferrara
Used 46+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Le resine sintetiche sono materiali:
naturali
artificiali
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Qual' è la principale materia prima della plastica?
Cellulosa
Sabbia silicea
Petrolio
Argilla
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
I monomeri sono molecole formate da carbonio ed idrogeno:
molto piccole (come le singole perle di una collana)
molto grandi (come una collana fatta da tantissime perle)
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
La plastica è un ottimo isolante sia termico sia elettrico
VERO
FALSO
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Dopo l'indurimento, le resine termoindurenti:
se riscaldate nuovamente, ritornano allo stato platico e possono essere rimodellate
se riscaldate nuovamente, non ritornano allo stato platico e non possono essere rimodellate
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Dopo l'indurimento, le resine termoplastiche:
se riscaldate nuovamente, ritornano allo stato platico e possono essere rimodellate
se riscaldate nuovamente, non ritornano allo stato platico e non possono essere rimodellate
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Nel processo di estrusione una resina:
viene fatta passare attraverso una serie di cilindri riscaldati
viene spinta attraverso il foro di una matrice da una vite senza fine
viene pressata tra uno stampo ed un contro stampo
aderisce alle pareti di uno stampo spinta dall'aria compressa
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