Which 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 & BiologyGraphite is a good conductor of electricity due to the presence of ......... .
(1) Lone pair of electrons.
(2) Free valence electrons.
(3) Cations.
(4) Anions.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following oxides shows electrical properties like metals?
1. SiO2
2. MgO
3. SO2 (s)
4. CrO2
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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 & 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 value of the magnetic moment is zero in the case of antiferromagnetic substances because the domains -
I. | Get oriented in the direction of the applied magnetic field |
II. | Get oriented opposite to the direction of the applied magnetic field |
III. | Are oppositely oriented with respect to each other without the application of magnetic field |
IV. | Cancel out each other’s magnetic moment |
The correct choice among the given is -
1. (I, II)
2. (II, III)
3. (III, IV)
4. (I, IV)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology