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Q. No.Dislocation defect is also known as-
1. Frenkel defect.
2. Schottky defect.
3. Non-stoichiometric defect.
4. Simple interstitial defect.
Subtopic: Imperfections in Solids & Semiconductors |
80%
Level 1: 80%+
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The edge lengths of the unit cells in terms of the radius of spheres constituting fcc, bcc, and simple cubic unit cells are respectively -
1.
2.
3.
4.
Subtopic: Voids, Radius Ratio & Coordination Number |
81%
Level 1: 80%+
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Subtopic: Imperfections in Solids & Semiconductors |
68%
Level 2: 60%+
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Consider the following statements about semiconductors.
| I. | Silicon doped with electron-rich impurity is a p-type semiconductor. |
| II. | Silicon doped with an electron-rich impurity is an n-type semiconductor. |
| III. | Delocalised electrons increase the conductivity of doped silicon. |
| IV. | An electron vacancy increases the conductivity of n-type semiconductor. |
1. I and II
2. II and III
3. III and IV
4. I and IV
Subtopic: Magnetic Behaviour of an Element/Compound |
85%
Level 1: 80%+
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Match the defects given in Column I with the statements given in Column II.
| Column I | Column II |
| A. Simple vacancy defect | 1. Shown by non-ionic solids and increases the density of the solid |
| B. Simple interstitial defect | 2. Shown by ionic solids and decreases the density of the solid |
| C. Frenkel defect | 3. Shown by non-ionic solids and decreases the density of the solid |
| D. Schottky defect | 4. Shown by ionic solids and density of the solid remains the same |
Codes
| A | B | C | D | |
| 1. | 3 | 1 | 4 | 2 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Imperfections in Solids & Semiconductors |
82%
Level 1: 80%+
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Match the types of defects given in Column I with the statement given in Column II.
| Column I | Column II |
| A. Impurity defect | 1. NaCl with anionic sites called F-centres |
| B. Metal excess defect | 2. FeO with Fe3+ |
| C. Metal deficiency defect | 3. NaCl with Sr2+ and some cationic sites vacant |
Codes
| A | B | C | |
| 1. | 2 | 3 | 1 |
| 2. | 3 | 1 | 2 |
| 3 | 1 | 2 | 3 |
| 4. | 2 | 1 | 3 |
Subtopic: Imperfections in Solids & Semiconductors |
73%
Level 2: 60%+
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Match the items given in Column I with the items given in Column II.
| Column I | Column II |
| A. Mg in solid state | 1. p-type semiconductor |
| B. MgCl2 in molten state | 2. n-type semiconductor |
| C. Silicon with phosphorus | 3. Electrolytic conductors |
| D. Germanium with boron | 4. Electronic conductors |
Codes
| A | B | C | D | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 3 | 2 | 1 |
Subtopic: Imperfections in Solids & Semiconductors |
86%
Level 1: 80%+
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Match the type of packing given in Column I with the items given in Column II.
| Column I | Column II |
| A. Square close packing in two dimensions | 1. Triangular voids |
| B. Hexagonal close packing in two dimensions | 2. Pattern of spheres is repeated in every fourth layer |
| C. Hexagonal close packing in three dimensions | 3. Coordination number = 4 |
| D. Cubic close packing in three dimensions | 4. Pattern of sphere is repeated in alternate layers |
Codes
| A | B | C | D | |
| 1. | 3 | 2 | 4 | 1 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 3 | 1 | 4 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Voids, Radius Ratio & Coordination Number |
66%
Level 2: 60%+
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Select the correct option based on statements below:
| Assertion (A): | The total number of atoms present in a simple cubic unit cell is one. |
| Reason (R): | Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Introduction & Crystal System |
86%
Level 1: 80%+
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Select the correct option based on statements below:
| Assertion (A): | Graphite is a good conductor of electricity. However, diamond belongs to the category of insulators. |
| Reason (R): | Graphite is soft in nature whereas diamond is very hard and brittle. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Introduction & Crystal System |
67%
Level 2: 60%+
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