- 1(current)
Q. No.The electrical conductivity of semiconductors increases with a rise in temperature because:
| 1. | Electrons jump from the valence band to the conduction band. |
| 2. | Electrons jump from the conduction band to the valence band. |
| 3. | No electrons jump from the valence band to the conduction band. |
| 4. | No electrons jump from the conduction band to the valence band. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substances?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect the correct option based on statements below:
| Assertion (A): | Ferromagnetic solids become paramagnetic upon heating. |
| Reason (R): | Unpaired electrons starts pairing upon heating. |
| 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. | Both (A) and (R) are false. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because:
| 1. | All the domains get oriented in the direction of the magnetic field. |
| 2. | All the domains get oriented in the direction opposite to the direction of the magnetic field. |
| 3. | Domains get oriented randomly. |
| 4. | Domains are not affected by the magnetic field. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe incorrect statement among the following is:
| 1. | Paramagnetic substances are weakly attracted by magnetic field. |
| 2. | Ferromagnetic substances cannot be magnetised permanently. |
| 3. | The domains in antiferromagnetic substances are oppositely oriented with respect to each other. |
| 4. | Pairing of electrons cancels their magnetic moment in the diamagnetic substances. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe phenomenon in which polar crystals on heating produce electricity is called:-
1. Pyro-electricity.
2. Piezo-electricity.
3. Ferro-electricity.
4. Ferri-electricity.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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