chemistry : class12 Non-Primitive Unit Cell : Crystalline solids : Solid State MCQ Questions and Answers
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Non-Primitive Unit Cell
MCQ questions and answers.
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MCQ Questions
1. A non-primitive unit cell contains how many lattice points in total?
A.
Exactly one
B.
More than one
C.
No lattice points
D.
Exactly half a lattice point
Correct Answer:
More than one
Explanation:
A non-primitive unit cell contains more than one lattice point, unlike a primitive unit cell, which contains exactly one lattice point.
2. How many lattice points are present in a body-centered cubic unit cell?
A.
1
B.
2
C.
4
D.
8
Correct Answer:
2
Explanation:
A body-centered unit cell has eight corner lattice points contributing one point in total, plus one complete lattice point at the body center, giving two lattice points.
3. How many lattice points are present in a face-centered cubic unit cell?
A.
1
B.
2
C.
4
D.
6
Correct Answer:
4
Explanation:
In a face-centered unit cell, the eight corners contribute one lattice point and the six face-centered points contribute three, giving four lattice points in total.
4. What is the contribution of one corner lattice point to a unit cell?
A.
1
B.
1/2
C.
1/4
D.
1/8
Correct Answer:
1/8
Explanation:
A corner lattice point is shared by eight neighboring unit cells, so its contribution to one unit cell is one-eighth.
5. What is the contribution of one face-centered lattice point to a unit cell?
A.
1/8
B.
1/6
C.
1/4
D.
1/2
Correct Answer:
1/2
Explanation:
A face-centered lattice point is shared equally by two adjacent unit cells, so it contributes one-half lattice point to each unit cell.
6. Which type of non-primitive unit cell has lattice points at the body center in addition to the corners?
A.
Primitive unit cell
B.
Body-centered unit cell
C.
Face-centered unit cell
D.
End-centered unit cell
Correct Answer:
Body-centered unit cell
Explanation:
A body-centered unit cell contains lattice points at all corners and one additional lattice point at the center of the body.
7. In a face-centered unit cell, where are the additional lattice points located?
A.
Only at the body center
B.
At the centers of all faces
C.
Only along the edges
D.
Outside the unit cell
Correct Answer:
At the centers of all faces
Explanation:
A face-centered unit cell has additional lattice points at the center of each of its six faces.
8. An end-centered unit cell has additional lattice points at the centers of how many opposite faces?
A.
One pair
B.
Two pairs
C.
Three pairs
D.
All eight faces
Correct Answer:
One pair
Explanation:
An end-centered unit cell has additional lattice points at the centers of one pair of opposite faces, along with the corner lattice points.
9. What is the total contribution of the eight corner lattice points in any unit cell?
A.
1 lattice point
B.
2 lattice points
C.
4 lattice points
D.
8 lattice points
Correct Answer:
1 lattice point
Explanation:
Each of the eight corner points contributes one-eighth, so their total contribution is 8 × 1/8 = 1 lattice point.
10. Which unit cell contains the greatest number of lattice points among the following?
A.
Primitive unit cell
B.
Body-centered unit cell
C.
End-centered unit cell
D.
Face-centered unit cell
Correct Answer:
Face-centered unit cell
Explanation:
A face-centered unit cell contains four lattice points, more than a primitive cell with one and body-centered or end-centered cells with two each.
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Non-Primitive Unit Cell
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