Materials and Components problems
- 1. If the valence electron is separated from a copper atom, the remaining part of atom has a net charge of
Options- A. 1
- B. - 1
- C. 0
- D. + 3 Discuss
Correct Answer: 1
- 2. Assertion (A): Magnetic susceptibility of copper is -0.5 x 10-5.
Reason (R): Copper is diamagnetic material.
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 and R is correct explanation of A
Explanation:
If magnetic susceptibility is very low ?, is nearly equal to 1 and the material is diamagnetic.
- 3. If there are no permanent dipoles in a dielectric material, the dielectric constant is independent of temperature.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. Assertion (A): Diamond and carborudum are both very hard materials.
Reason (R): Valence band can be extremely strong.
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 and R is correct explanation of A
Explanation:
Valence bond results in hardness.
- 5. Lines of magnetic field cannot intersect.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. The equation D = ?0?r E refers only to isotropic materials.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. The spin angular momentum along a given direction is either
or 
.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. A dielectric is subjected to alternating field. The dielectric losses are potential to
Options- A. real part of dielectric constant
- B. imaginary part of dielectric constant
- C. both real and imaginary parts of dielectric constant
- D. either real or imaginary part of dielectric constant Discuss
Correct Answer: imaginary part of dielectric constant
Explanation:
Absorption of energy is proportional to imaginary part of complex dielectric constant.
- 9. The number of tightly bound electrons in silicon atom are
Options- A. 14
- B. 10
- C. 6
- D. 4 Discuss
Correct Answer: 10
Explanation:
Silicon has 14 electons and 4 valence electrons. The 10 electrons in the inner orbits are tightly bound.
- 10. Electric dipole moment is usually expressed in debye units. Here, 1 debye unit equals
Options- A. 3.33 x 10-30 C-m
- B. 3.33 x 10-30 C-m2
- C. 3.30 x 10-10 C-m
- D. 3.33 x 10-10 C-m2 Discuss
Correct Answer: 3.33 x 10-30 C-m
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