# Topic: Solid State (Test 1)

Topic: Solid State
Q.1
Coordination number of hcp and ccp is
A. 12
B. 4
C. 6
D. 2
Answer : Option A
Explaination / Solution:

In hcp and ccp lattice, each atom is surrounded by 12 other atoms . Therefore, hcp and ccp lattice have ccordination no. 12.

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Q.2
Brass is an example of
A. molecular crystal
B. molecular crystal
C. ionic crystal
D. covalent crystal
Answer : Option B
Explaination / Solution:

Brass is Mettalic Crystal

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Q.3
What is the total number of atoms per unit cell in a face centered cubic structure?
A. 1
B. 6
C. 4
D. 2
Answer : Option C
Explaination / Solution:

In Fcc each atom at corner contributes 1 per unit cell while atoms at face centers contribute 3 to each unit cell. So Total no of atoms per unit cell is 4

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Q.4
The number of atoms per unit cell in a body centered cubic structure is
A. 4
B. 6
C. 2
D. 1
Answer : Option C
Explaination / Solution:

Atoms at corner contribute 1 to a unit cell and one atom is present in body center contribute 1. So total no. of atoms per unit cell is 2.

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Q.5
Ionic solids containing large differences in sizes of ions show
A. F – centeirs
B. Frenkel defect
C. Schottky defect
D. Interstitials defect
Answer : Option B
Explaination / Solution:

Smaller atoms can easy occupy interstitial postion showing Frenekel Defect.

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Q.6
Defect shown by non – ionic solids is
A. Interstitials defect
B. Frenkel defect
C. F – centers
D. Schottky defect
Answer : Option A
Explaination / Solution:

Non ionic solids shows interstitial defect.

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Q.7
Which is true for F – centers?
A. Density of the substance increases
B. Imparts colour to the crystal
C. Creates vacancy
D. Decreases density of the substance
Answer : Option B
Explaination / Solution:

The paired electron can get excited and on returning back to ground state it emits light thus imparts color

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Q.8
The paired electron can get excited and on returning back to ground state it emits light thus imparts color
A. Ferromagnetic
B. Diamagnetic
C. Paramagnetic
D. Ferrimagnetic
Answer : Option B
Explaination / Solution:

Diamagnetic substances have full filled electrons so they are replealed by Magnetic field.

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Q.9
All those atoms or molecules which have an odd number of electrons are
A. Diamagnetic
B. Ferromagnetic
C. Ferrimagnetic
D. Paramagnetic
Answer : Option D
Explaination / Solution:

They will have unpaired electrons

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Q.10
Substances that are strongly attracted by applied magnetic field and can be permanently magnetized are
A. Ferrimagnetic
B. Diamagnetic
C. Paramagnetic
D. Ferromagnetic
Answer : Option D
Explaination / Solution:

Ferromagnetic substance get permanently magnetised in applied Magnetic Field.

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