
sim 2k
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Luca David
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110 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Metalele sunt substante cristaline (exceptie face ___) in care atomii sunt distribuiti ______ respectând _
_____in care distantele dinte atomi sunt ____
mercurul,ordonat periodic,anumite legi de simetrie,determinând structuri cristaline specifice, de ordinul angstromilor.
mercurul,ordonat periodic,anumite legi de simetrie,determinând structuri cristaline specifice,
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Celula elementara este:
a. Retea de puncte tridimensionale
a. Cel mai mic poliedru prin a carui translatie de-a lungul a trei directii se reproduce reteaua cristalina.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Elementele geometrice ale unei retele spatiale sunt:
a. Axele cristalografice
a. Punctele sau nodurile
Indicii Miller
Directiile cristaline sau sirul reticular
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Numarul de noduri ce apartine unei celule elementare este dat de relatia:
a. N = Ni + Nf / 3 + Nc / 8
b. N = Ni + Nf / 4 + Nc / 2
N = Ni + Nf / 2 + Nc / 8
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
. Reteaua cubica simpla se caracterizeaza prin
Prezenta unui atom in cele 8 noduri ale retelei cristaline
Prezenta unui atom in cele 8 noduri ale retelei cristaline si un atom in centrul celulei elementare
a. Prezenta unui atom in cele 8 noduri ale retelei cristaline si un atom in centrul celor 6
fete
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Retelei cubice cu baze centrate ii revin in total:
Un atom
Doi atomi
a. Patru atomi
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Precizati cele 8 noduri, 4 directii si 4 plane cristalografice
desenu e corect
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