1. | Which of the following are donor impurities? 1.Gold 2.Phosphorus 3.Boron 4.Antimony 5.Arsenic 6.Induim Select the correct answer using the following codes |
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Answer: Option D Explanation: Donor impurities have five valence electrons. |
2. | In a true valence crystal, the bonding between the atoms is accomplished by the sharing of valence electrons. |
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Answer: Option A Explanation: Sharing of valence electons is a characteristic of true valence crystal. |
3. | The number of valence electrons in donor impurity are |
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Answer: Option A Explanation: Donor impurity has 5 valence electrons (while silicon has 4 valence electrons). Hence donor impurity can donate electrons. |
4. | The apparent capacitance at a high angular frequency ω of an air cored capacitor having capacitance C and inductance L is given by |
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5. | If a piece of wood is placed in a magnetic field |
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Answer: Option A Explanation: Wood is non-magnetic. |
6. | Assertion (A): If E is available energy state eV and EF is Fermi level, then probability of energy state E being occupied = 0.5. |
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Answer: Option B Explanation: E = EF, f(E) = 0.5. |
7. | Assertion (A): From the slope of the line in Figure, we can find permanent dipole moment of the molecules. Reason (R): Total polarization of a polyatomic gas is given by P = N(ae + ai + μ2p / 3kT)E. |
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Answer: Option A Explanation: |
8. | Assertion (A): For a solenoid having N turns, Reason (R): For all magnetic materials, B increases linearly with I.
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Answer: Option C Explanation: Increase of B with I is not linear. Hence R is false. |