chemistry : class12 Cubic Unit Cells : Crystalline solids : Solid State MCQ Questions and Answers
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Cubic Unit Cells
MCQ questions and answers.
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MCQ Questions
1. How many atoms are effectively present in one simple cubic unit cell?
A.
1
B.
2
C.
4
D.
8
Correct Answer:
1
Explanation:
A simple cubic unit cell has atoms only at its eight corners. Each corner atom contributes one-eighth to the unit cell, so the total number of atoms is 8 × 1/8 = 1.
2. How many atoms are effectively present in one body-centred cubic unit cell?
A.
1
B.
2
C.
4
D.
6
Correct Answer:
2
Explanation:
A body-centred cubic unit cell contains eight corner atoms contributing one atom in total and one complete atom at the body centre. Thus, it contains 2 atoms.
3. How many atoms are effectively present in one face-centred cubic unit cell?
A.
1
B.
2
C.
4
D.
8
Correct Answer:
4
Explanation:
In a face-centred cubic unit cell, the eight corner atoms contribute one atom and the six face-centred atoms contribute three atoms. Therefore, the total is 4 atoms.
4. In a cubic unit cell, an atom located at a corner is shared equally by how many unit cells?
A.
2
B.
4
C.
6
D.
8
Correct Answer:
8
Explanation:
A corner of a cubic unit cell is common to eight surrounding unit cells. Therefore, each corner atom contributes one-eighth to any one unit cell.
5. Which type of cubic unit cell has an atom at the centre of the cube in addition to atoms at the corners?
A.
Simple cubic
B.
Body-centred cubic
C.
Face-centred cubic
D.
Primitive cubic
Correct Answer:
Body-centred cubic
Explanation:
A body-centred cubic unit cell has atoms at all eight corners and one additional atom at the centre of the cube.
6. In a face-centred cubic unit cell, atoms are present at the centre of each
A.
Edge
B.
Face
C.
Diagonal
D.
Corner only
Correct Answer:
Face
Explanation:
The defining feature of a face-centred cubic unit cell is the presence of one atom at the centre of each of its six faces, along with atoms at the corners.
7. What fraction of an atom at the centre of a face belongs to one cubic unit cell?
A.
1/8
B.
1/6
C.
1/4
D.
1/2
Correct Answer:
1/2
Explanation:
A face-centred atom is shared equally between two adjacent cubic unit cells. Hence, one-half of the atom belongs to a particular unit cell.
8. Which cubic unit cell contains atoms only at the eight corners?
A.
Simple cubic
B.
Body-centred cubic
C.
Face-centred cubic
D.
Base-centred cubic
Correct Answer:
Simple cubic
Explanation:
In a simple cubic unit cell, the lattice points are located only at the eight corners, with no atoms at the body centre or face centres.
9. What is the coordination number of a body-centred cubic structure?
A.
4
B.
6
C.
8
D.
12
Correct Answer:
8
Explanation:
In a body-centred cubic structure, each atom has eight nearest neighbouring atoms. Therefore, its coordination number is 8.
10. What is the coordination number of a face-centred cubic structure?
A.
4
B.
6
C.
8
D.
12
Correct Answer:
12
Explanation:
In a face-centred cubic structure, each atom is surrounded by twelve nearest neighbours. Thus, its coordination number is 12.
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