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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 5
6.
In anti-ferromagnetic materials, the graph of susceptibility versus temperature shows a sharp maximum at a certain temperature. This temperature is known as
Curie temperature
Neel temperature
Weiss temperature
Bitter temperature
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
A parallel plate capacitor has area of plate A and plate separation d. Its capacitance is C. A metallic plate P of area A and negligible thickness is added as shown in Figure. The new value of capacitance is
C
2C
0.5 C
0.25 C
Answer: Option
Explanation:

The new configuration has two capacitors in series and the capacitance of each is 2C.

8.
The wavelength of light emitted by GaAs laser is 8670 x 10-10 m. If h = 6.626 x 10-34 Js, velocity of light = 3 x 108 m/s and eV = 1.602 x 10-19 J, the energy gap in GaAs is
0.18 eV
0.7 eV
1.43 eV
2.39 eV
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Diamagnetic materials do not have permanent magnetic dipoles.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of
copper decreases and germanium increases
both decreases
both increases
copper increases and germanium decreases
Answer: Option
Explanation:

As temperature is decreased, resistance of conductors decreases and resistance of semiconductors increases.

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