## Solid State Quiz-12

Legal Aptitude is an important subject in CLAT,DULLB & Other Law Exams. In any of law exam, legal aptitude carries weightage of 25 % of questions. With focused practice good marks can be fetched from this section. These questions are very important in achieving your success in CLAT, DULLB and Other Law Exams..

Q1. Density of a crystal remains unchanged as a result of
•  Ionic defect
•  Schottky defect
•  Frenkel defect
•  Crystal defect
Solution
Due to Frenkel defect, density of a crystal remains unchanged.

Q2.Number of atoms in the unit cell of Na(bcc type crystal) and Mg(fcc type crystal ) are respectively :
•  4,4
•  4,2
•  2,4
•  1,1
Solution
Due to Frenkel defect, density of a crystal remains unchanged. .

Q3.  The unit cell cube length for (just like structure) is 5.14 , Assuming anion-anion contact, the ionic radius for chloride ion is:
•   1.815
•  2.8
•  3.8
•
4.815
Solution
The distance between and ion can be derived as half of the edge length of cube= 1.815.

Q4. Silicon dioxide is an example of
•  Metallic crystal
•  Ionic crystal
•  Covalent crystal
•  None of these
• Solution
is covalent crystal like diamond and graphite

Q5. In which of the following crystals alternate tetrahedral voids are occupied?
•  browns
•  ions
•  copper
•  iron
• Solution
In structure, sulphide ions occupy all (fcc) lattice points while ions are present in alternate tetrahedral sites.Therefore, there is one ion for every ion.
Q6. If the positions of and are interchanges in the crystal lattice with respect to and is
•  Both fcc
•  Both bcc
• Fcc and bcc
•  Bcc and fcc
• Solution
Each (in bcc) in is surrounded by six (in fcc) and each in is surrounded by six and thus, on interchanging and the fcc structure of will not change but with respect to it will be fcc and with respect to it will be bcc.

Q7.A solid has type structure with edge length 580.4 pm. The radius of is 100 pm. What is the radius of ?
•  190.2
•  540.13
•  525
•  78.12
Solution
has fcc structure and thus, = 290.2= 290.2 – 100 = 190.2

Q8.Sodium metal crystallises at room temperature in a body centred cubic lattice with a cell edge The radius of sodium atom is
•  1.40
•  T2.65
•  1.85
•  2.15
Solution

Q9.The elements commonly used for making transistors are
•  C and Si
•  Ga and In
•  si and c
•  Si and Ge
Solution
Si and Ge are used for making transistors.

Q10. Most crystals show good cleavage because their atoms, ions and molecules are
•  Weakly bonded together
•  Strongly bonded together
•  Spherically symmetrical
• Arranged in planes
Solution
Section 138 of the Negotiable Instruments Act, 1881 states that the dishonour of cheque is a criminal offence and is punishable by imprisonment up to two years or with monetary penalty or with both.

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