Discussion
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- Question
In a valence crystal, the valence electrons
Options- A. are not shared
- B. are shared between neighbouring atoms
- C. are shared by all atoms
- D. any of the above
- Correct Answer
- are shared between neighbouring atoms
ExplanationIn true valence crystals the binding between the atoms is accomplished by the sharing of valence electrons.This sharing can only be between neighbouring atoms only.
Materials and Components problems
Search Results
- 1. For iron, the ferromagnetic Curie temperature is
Options- A. about 20 K
- B. about 100°C
- C. about -20°C
- D. about 1000 K Discuss
Correct Answer: about 1000 K
- 2. Assertion (A): Drift velocity of electrons is proportional to the applied electric field E.
Reason (R): The average drift velocity per unit field is called mobility.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Correct Answer: Both A and R are true but R is not correct explanation of A
- 3. Assertion (A): ?0 has the dimensions of farad per meter.
Reason (R): D = ?0?r E.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Correct Answer: Both A and R are true but R is not correct explanation of A
Explanation:
The dimensions of ?0 can be derived from the expression D = ?0?r E.- 4. Assertion (A): Both sodium and ferrous are ferromagnetic.
Reason (R): Both sodium and ferrous have body centred cubic structure.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Correct Answer: Both A and R are true but R is not correct explanation of A
- 5. Assertion (A): The regular or irregular stacking of atoms has importanteffect on properties of materials.
Reason (R): The arrangement of atoms in a given material can be studied using X-rays.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Correct Answer: Both A and R are true but R is not correct explanation of A
- 6. The probability of recombination of electrons and holes in a semiconductor is proportional to
Options- A. density of electrons
- B. density of holes
- C. density of electrons and holes
- D. none of the above Discuss
Correct Answer: density of electrons and holes
- 7. A photoconductor is a
Options- A. conductor
- B. semiconductor
- C. insulator
- D. superconductor Discuss
Correct Answer: semiconductor
- 8. Dielectric constant, under the condition of alternating fields, is a complex quantity.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. The amount of time between the creation and recombination of a free electron and hole is called
Options- A. relaxation time
- B. life time
- C. lorentz time
- D. collision time Discuss
Correct Answer: life time
- 10. In ferromagnetic materials, the orientation between neighbouring permanent dipoles is parallel.
Options- A. True
- B. False Discuss
Correct Answer: True
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