Discussion
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- Question
An atom of polarizability a is placed in a homogeneous electric field E. The energy stored in polarized atom is
Options- A. aE2
- B. a2E
- C. ½ aE2
- D. ½ aE
- Correct Answer
- ½ aE2
- 1. Silicon and germanium are elements in the
Options- A. second column of periodic table
- B. third column of periodic table
- C. fourth column of periodic table
- D. fifth column of periodic table Discuss
- 2. Antiferromagnetic materials do not have permanent dipoles.
Options- A. True
- B. False Discuss
- 3. The units of polarization of dielectric are
Options- A.
- B.
- C. Cm
- D.
Discuss
- 4. The most important primary force of attraction in the formation of solids is
Options- A. electromagnetic
- B. electrostatic
- C. quantum-electrostatic
- D. quantum electromagnetic Discuss
- 5. Assertion (A): In a conductor, current density remains constant in time as long as E is constant.
Reason (R): In a conductor, J = ?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
- 6. A capacitor can be represented by a capacitance and resistance in parallel. For a good capacitor, this parallel resistance should be
Options- A. negligible
- B. low
- C. high
- D. very high Discuss
- 7. When a potential is applied across an intrinsic semiconductor, holes flow
Options- A. towards positive terminal
- B. away from positive terminal
- C. in the external circuit only
- D. none of the above Discuss
- 8. ?0 has no other physical meaning than that of a fundamental conversion factor.
Options- A. True
- B. False Discuss
- 9. n type semiconductors
Options- A. are negatively charged
- B. are produced when indium as impurity is added to germanium
- C. are produced phosphorus as impurity is added to silicon
- D. none of the above Discuss
- 10. Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.
Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.
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
Materials and Components problems
Search Results
Correct Answer: fourth column of periodic table
Correct Answer: False
Explanation:
Anti-ferromagnetic materials have permanent dispoles but antiparallel orientation of equal moments.
Correct Answer:
Explanation:
Polarization P = ?0(?r - 1)E.
Therefore units of Polarization = 
.
Correct Answer: electrostatic
Correct Answer: Both A and R are true and R is correct explanation of A
Explanation:
In conductors constant E means constant current because conductivity is constant.
Correct Answer: very high
Explanation:
The dielectric of a good capacitor should have very high resistivity.
Correct Answer: away from positive terminal
Explanation:
Holes are positively charged and move away from positive terminal.
Correct Answer: True
Correct Answer: are produced phosphorus as impurity is added to silicon
Explanation:
n type semiconductors are produced by adding pentavalent material like phosphorus to silicon.
Correct Answer: Both A and R are true and R is correct explanation of A
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