Solid State Test

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Solid State Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

In a cube, X atoms are present at corners and Y atoms are at face centres of a cube. The number of X and Y are:

A
$$8,8$$

B
$$6,8$$

C
$$8,6$$

D
$$6,6$$

Solution

No. of corner position in a cube= 8
No. of face centres present in a cube=6

$$X=8, Y=6$$
Question 2
1 / -0

Percentage of free space in cubic close packed structure and in body centred packed structure are respectively ___________.

A
$$30 \% \quad and \quad 26\%$$

B
$$26 \% \quad and \quad 32\%$$

C
$$48 \% \quad and \quad 48\%$$

D
$$32 \% \quad and \quad 26\%$$

Solution

The packing efficiency in a ccp structure = 74%
Therefore, Percentage free space = 100 – 74 = 26%
Packing efficiency in a body centred structure = 68%
Therefore, Percentage free space = 100 – 68 = 32%
Question 3
1 / -0

Which of the following statements are true for glasses?

A
They are amorphous solids.

B
They are supercooled liquids.

C
They have long range order.

D
Both A and B are correct.

Solution

Glasses are amorphous solids. Amorphous solids do not have a specific arrangement pattern.
All amorphous solids have a tendency to flow though very slowly. Hence, glass is considered as a super cooled liquid. That is why, glass windows and doors become slightly thicker at the bottom than at the top with time.
Amorphous solids do not exhibit long order arrangement.
Question 4
1 / -0

The number of basic crystal system present in the solid structure is:

A
$$7$$

B
$$8$$

C
$$6$$

D
$$4$$

Solution

The seven crystal systems are a method of classifying crystals according to their atomic lattice or structure. They are
1. Cubic system
2. Tetragonal sysytem
3. Hexagonal system
4. Orthorhombic system
5. Monoclinic system
6. Triclinic system
7. Rhombohedral system
Question 5
1 / -0

The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is:

A
exactly the same in both cases

B
partly same and partly different

C
different from each other

D
nothing definite

Solution

The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is exactly the same in both cases. It is an AB type.

The arrangement of the third layer in hcp is ABA type. The overall arrangement becomes ABAB type. The arrangement of the third layer, one above the other, in ccp is ABC type. The overall arrangement becomes ABCABC type.

Hence, the correct option is ( A )
Question 6
1 / -0

Potassium crystallizes in a:

A
face-centred cubic lattice

B
body-centred cubic lattice

C
simple cubic lattice

D
orthorhombic lattice

Solution

Potassium (alkali metal) and iron are examples of metals that arrange themselves in bcc (body-centered cubic lattice).
Question 7
1 / -0

Crystal of sodium chloride belong to the ______ system.

A
orthorhombic

B
cubic

C
trigonal

D
monoclinic

Solution

In sodium chloride (NaCl), the chloride ions are arranged in a cubic structure (called as face centered cubic) and sodium ions occupy octahedral voids between them. Each sodium ion is surrounded by 6 chloride ions. So, B is the correct answer.
Question 8
1 / -0

The maximum percentage of available volume that can be filled in a face centred cubic system by an atom is:

A
$$74\%$$

B
$$68\%$$

C
$$34\%$$

D
$$26\%$$

Solution

Face-centered cubic cells have $$74\%$$ packaging efficiency for spheres or ions of equal diameter. Some examples of FCC arrangements are aluminum, copper and buckminsterfullerenes-C-60 (buckyballs) etc.
Question 9
1 / -0

Amorphous solids:

A
possess sharp melting points

B
undergo clean cleavage when cut with a knife

C
do not undergo clean cleavage when cut with a knife

D
possess orderly arrangement over long distances.

Solution

Amorphous solids do not have a regular pattern of arrangement and hence, cannot be cut with knife for a clean cleavage.
Question 10
1 / -0

In which of the following arrangements, a metal would have the least density?

A
BCC

B
CCP

C
HCP

D
SC

Solution

Density is directly proportional to the packing efficiency of a unit cell.

The packing efficiency of a simple cubic lattice is 52.4%.

Hence, Simple cubic lattice (SC) has the least packing efficiency among other unit cells.

Option $$D$$ is correct.

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Re-Attempt Weekly Quiz Competition

Solid State Test - 20

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Solid State Test - 20

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SHARING IS CARING

Question 1

$$8,8$$

$$6,8$$

$$8,6$$

$$6,6$$

Solution

Question 2

$$30 \% \quad and \quad 26\%$$

$$26 \% \quad and \quad 32\%$$

$$48 \% \quad and \quad 48\%$$

$$32 \% \quad and \quad 26\%$$

Solution

Question 3

They are amorphous solids.

They are supercooled liquids.

They have long range order.

Both A and B are correct.

Solution

Question 4

$$7$$

$$8$$

$$6$$

$$4$$

Solution

Question 5

exactly the same in both cases

partly same and partly different

different from each other

nothing definite

Solution

Question 6

face-centred cubic lattice

body-centred cubic lattice

simple cubic lattice

orthorhombic lattice

Solution

Question 7

orthorhombic

cubic

trigonal

monoclinic

Solution

Question 8

$$74\%$$

$$68\%$$

$$34\%$$

$$26\%$$

Solution

Question 9

possess sharp melting points

undergo clean cleavage when cut with a knife

do not undergo clean cleavage when cut with a knife

possess orderly arrangement over long distances.

Solution

Question 10

BCC

CCP

HCP

SC

Solution

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