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University

110 Qs

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Assessment

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Science

University

Practice Problem

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Luca David

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110 questions

Show all answers

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

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