Discussion
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- Question
If temperature is increased, the temperature coefficient of a metal
Options- A. increases
- B. decreases
- C. may increase or decrease
- D. remains constant
- Correct Answer
- decreases
- 1. Lines of magnetic field attract each other.
Options- A. True
- B. False Discuss
- 2. 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
- 3. The number of valence electrons in germanium atom is
Options- A. 4
- B. 2
- C. 1
- D. zero Discuss
- 4. 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
- 5. Automobile ignition systems use the principle of
Options- A. resistance
- B. self inductance
- C. mutual inductance
- D. capacitance Discuss
- 6. In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is ?0(?r - 1) E.
Options- A. True
- B. False Discuss
- 7. The temperature at which some materials become superconductors is called
Options- A. Transition temperature
- B. Curie temperature
- C. Neel temperature
- D. Onnes temperature Discuss
- 8. A parallel plate capacitor having C = 200 x 10-12 F has loss dielectric having tan ? = 4 x 10-4. At an ac voltage of f = 106 Hz and peak value 2 V, the dielectric losses are
Options- A. 10-8 W
- B. 10-6 W
- C. 10-4 W
- D. 10-2 W Discuss
- 9. When temperature is more than ferromagnetic curie temperature, the behaviour of a ferromagnetic material is similar to that of paramagnetic material.
Options- A. True
- B. False Discuss
- 10. The quantum numbers associated with electron motion are designed as
Options- A. a, b, c
- B. h, k, l
- C. n, m, l
- D. h, n, l Discuss
Materials and Components problems
Search Results
Correct Answer: False
Explanation:
Lines of magnetic field repel each other.
Correct Answer: 0.01
Correct Answer: 4
Correct Answer: temporary smagnets
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: True
Correct Answer: Transition temperature
Correct Answer: 10-6 W
Explanation:
Dielectric losses = v2 ?C tan ?.
Correct Answer: True
Correct Answer: n, m, l
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