Discussion
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- Question
When an atom of polarizability a is placed in an electric field E, the energy stored in atom is 0.5 a E2.
Options- A. True
- B. False
- Correct Answer
- True
- 1. The mass of proton and electron are
Options- A. 1.672 x 10-26 kg and 9.107 x 10-31 kg respectively
- B. 9.107 x 10-26 kg and 9.107 x 10-31 kg respectively
- C. 9.107 x 10-29 kg and 9.107 x 10-31 kg respectively
- D. 9.107 x 10-30 kg and 9.107 x 10-31 kg respectively Discuss
- 2. Consider the following materials
- Nickel
- Silver
- Oxygen
- Aluminium
Options- A. 1, 4, 3, 2
- B. 1, 4, 2, 3
- C. 4, 1, 3, 2
- D. 4, 1, 2, 3 Discuss
- 3. Ferrimagnetic materials have anti-parallel orientation of equal moments of permanent dipoles.
Options- A. True
- B. False Discuss
- 4. The resistance of a metallic wire would
Options- A. increase as f increase
- B. decrease as f increase
- C. remains the same at all frequencies
- D. increase with f up to a certain frequency and then decrease Discuss
- 5. The resistance of a photoconductor
Options- A. increases with increase in light intensity
- B. decreases with increase in light intensity
- C. may increase or decrease with increase in light intensity
- D. remains constant Discuss
- 6. If ?0 is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ?, when a magnetic field B is acting is ? ? ?0 + (e/2m)B.
Options- A. True
- B. False Discuss
- 7. Automobile ignition systems use the principle of
Options- A. resistance
- B. self inductance
- C. mutual inductance
- D. capacitance Discuss
- 8. The materials having low retentivity are suitable for making
Options- A. temporary smagnets
- B. weak magnets
- C. permanent magnets
- D. both temporary and permanent magnets Discuss
- 9. The number of valence electrons in germanium atom is
Options- A. 4
- B. 2
- C. 1
- D. zero Discuss
- 10. The carrier mobility in a semiconductor is 0.4 m2/Vs. Its diffusion constant at 300 K will be (in m2/s)
Options- A. 0.40
- B. 0.16
- C. 0.04
- D. 0.01 Discuss
Materials and Components problems
Search Results
Correct Answer: 1.672 x 10-26 kg and 9.107 x 10-31 kg respectively
Correct Answer: 1, 4, 2, 3
Correct Answer: True
Correct Answer: increase as f increase
Explanation:
As increases the resistance increases due to skin effect.
Correct Answer: decreases with increase in light intensity
Correct Answer: True
Correct Answer: mutual inductance
Explanation:
A high voltage is induced due to mutual inductance because the number of turns in secondary coil is very high.
Correct Answer: temporary smagnets
Correct Answer: 4
Correct Answer: 0.01
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