Solid State Test

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Solid State Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

How can anyone differentiate crystalline and amorphous solids?

A
On the basis of number of particles.

B
On the basis of size of particles.

C
On the basis of arrangement of particles.

D
On the basis of types of atoms.

Solution

In a crystalline solid, there is a regular arrangement of particles that will result in a well defined crystal array. In an amorphous solid, there is no regular arrangement of particles.
Question 2
1 / -0

Which of the following solid is isotropic?

A
Molecular

B
Amorphous

C
Metallic

D
Ionic

Solution

Amorphous solids are isotropic because they have no long range order.
Question 3
1 / -0

Three elements X, Y and Z crystallise in a cubic solid with X at corners, Y at body centre and Z at the face centres of the cube, then the formula of the solid is

A
XYZ

B
XYZ₃

C
X₃YZ

D
XY₃Z

Solution

There is one atom of X, one atom of Y and 3 atoms of Z.
Question 4
1 / -0

Packing efficiency of body centred cubic unit cell is:

A
88%

B
78%

C
68%

D
60%

Solution

Packing efficiency of body centred cubic unit cell is 68%.
Question 5
1 / -0

Why ZnO is yellow at high temperature?

A
Because Zn ion (Zn²⁺) is trapped.

B
Because impurity is trapped.

C
Because it loses oxygen, zinc ions move to interstitial site and electrons to the neighbouring interstitial sites.

D
Because oxide ion (O^2-) is trapped.

Solution

Electrons are trapped in place of the O^2-.
Question 6
1 / -0

Why ancient glass becomes milky?

A
On ageing cracks develop.

B
On ageing amorphous nature increases.

C
On ageing refractive index changes.

D
On ageing crystallization occurs.

Solution

Amorphous solids become crystalline on ageing e.g. ancient glass appears milky due to crystallization.
Question 7
1 / -0

The unoccupied space in an unit cell is called as

A
Void

B
Filled space

C
Lattice

D
Empty space

Solution

There is always space in the form of voids which is unoccupied as spheres cannot occupy 100% space. This empty space is called void.
Question 8
1 / -0

Why do metallic solids conducts electricity?

A
Due to close packing of negative charge.

B
Due to closely packed positive ions.

C
Due to loosely bounded particles.

D
Due to free or delocalised electrons.

Solution

Metals have metallic bond which is a compact packing of positive charge in a pool of delocalised electrons. As a result, they conduct electricity.
Question 9
1 / -0

Which of the following best describes a tetrahedral void?

A
space unoccupied between 6 spheres.

B
unoccupied space between 4 spheres arranged in a terahedron.

C
space within a cube.

D
combination of triangular voids.

Solution

Unoccupied triangular space between 4 spheres (3 in one plane and one above).
Question 10
1 / -0

If r is radius of void and R is radius of the sphere, then for an atom to ocuppy an octahedral void which relation holds true?

A
r = 2.25 R

B
r = 0.414 R

C
r = 0.225 R

D
r = 225 R

Solution

For an atom to occupy a octahedral void, its radius must be 0.414 times the radius of the sphere.

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Solid State Test - 3

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Solid State Test - 3

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Question 1

On the basis of number of particles.

On the basis of size of particles.

On the basis of arrangement of particles.

On the basis of types of atoms.

Solution

Question 2

Molecular

Amorphous

Metallic

Ionic

Solution

Question 3

XYZ

XYZ3

X3YZ

XY3Z

Solution

Question 4

88%

78%

68%

60%

Solution

Question 5

Because Zn ion (Zn2+) is trapped.

Because impurity is trapped.

Because it loses oxygen, zinc ions move to interstitial site and electrons to the neighbouring interstitial sites.

Because oxide ion (O2-) is trapped.

Solution

Question 6

On ageing cracks develop.

On ageing amorphous nature increases.

On ageing refractive index changes.

On ageing crystallization occurs.

Solution

Question 7

Void

Filled space

Lattice

Empty space

Solution

Question 8

Due to close packing of negative charge.

Due to closely packed positive ions.

Due to loosely bounded particles.

Due to free or delocalised electrons.

Solution

Question 9

space unoccupied between 6 spheres.

unoccupied space between 4 spheres arranged in a terahedron.

space within a cube.

combination of triangular voids.

Solution

Question 10

r = 2.25 R

r = 0.414 R

r = 0.225 R

r = 225 R

Solution

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XYZ₃

X₃YZ

XY₃Z

Because Zn ion (Zn²⁺) is trapped.

Because oxide ion (O^2-) is trapped.