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Q. No.Liquids and gases are categorised as fluids because of :
1. Tendency to liquefy.
2. Free electrons.
3. Tendency to flow.
4. Strong forces of attraction.
Subtopic: Introduction & Crystal System |
79%
Level 2: 60%+
Hints
Solids are incompressible because :
1. Distance between constituent particles is very less.
2. Forces of attraction between constituent particles are weak.
3. Distance between constituent particles is high.
4. They have low melting points.
1. Distance between constituent particles is very less.
2. Forces of attraction between constituent particles are weak.
3. Distance between constituent particles is high.
4. They have low melting points.
Subtopic: Introduction & Crystal System |
81%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Select the correct option based on statements below:
| Assertion (A): | In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells. |
| Reason (R): | In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality. |
| 1. | (A) is false but (R) is true. |
| 2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 4. | (A) is true but (R) is false. |
Subtopic: Imperfections in Solids & Semiconductors |
Level 3: 35%-60%
NEET - 2022
Hints
Copper crystallises in fcc unit cell with a cell edge length of \(3.608 \times 10^{-8}\) cm. The density of copper is \(8.92 \ g ~cm^{-3}\). The atomic mass of copper is:
1. 65 u
2. 63.1 u
3. 31.55 u
4. 60 u
1. 65 u
2. 63.1 u
3. 31.55 u
4. 60 u
Subtopic: Density & Packing Fraction |
68%
Level 2: 60%+
NEET - 2022
Hints
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because:
| 1. | all the domains get oriented in the direction opposite to the direction of magnetic field. |
| 2. | domains are not affected by magnetic field. |
| 3. | domains get randomly oriented. |
| 4. | all the domains get oriented in the direction of magnetic field. |
Subtopic: Magnetic Behaviour of an Element/Compound |
78%
Level 2: 60%+
NEET - 2022
Hints
Which statements among the following is not correct?
| 1. | When conduction band and valence band overlap, a semiconductor is obtained |
| 2. | Ferrimagnetism arises due to the alignment of magnetic moments of the domains in the substance in parallel and anti-parallel directions in unequal numbers |
| 3. | Replacing some silicon atoms by boron atoms in crystal of silicon produces p-type semiconductor |
| 4. | Replacing some germanium atoms by phosphorus atoms in a crystal of germanium produces n-type semiconductor |
Subtopic: Imperfections in Solids & Semiconductors |
71%
Level 2: 60%+
NEET - 2022
Hints
Substances used for making permanent magnets are :
1. Ferrimagnetic
2. Ferromagnetic
3. Antiferromagnetic
4. Both (1) and (3)
1. Ferrimagnetic
2. Ferromagnetic
3. Antiferromagnetic
4. Both (1) and (3)
Subtopic: Imperfections in Solids & Semiconductors |
78%
Level 2: 60%+
Hints
A group 14 element is converted into n-type semiconductor by doping it with :
1. Boron
2. Aluminium
3. Phosphorous
4. All of the above.
Subtopic: Imperfections in Solids & Semiconductors |
76%
Level 2: 60%+
Hints
When a cation of higher valency is added as an impurity in an ionic solid, then :
1. Vacancies are created .
2. Stoichiometry remains unaffected.
3. Excess of metal ions is created.
4. Both (2) and (3)
1. Vacancies are created .
2. Stoichiometry remains unaffected.
3. Excess of metal ions is created.
4. Both (2) and (3)
Subtopic: Imperfections in Solids & Semiconductors |
Level 3: 35%-60%
Hints
| Statement 1: | ZnS shows Frenkel defect. |
| Statement 2: | AgBr shows Frenkel as well as Schottky defect. |
1. Statement 1 is true , statement 2 is false.
2. Statement 1 is false , statement 2 is true.
3. Both statements are true.
4. Both statements are false.
Subtopic: Imperfections in Solids & Semiconductors |
84%
Level 1: 80%+
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