Electronics and Communication Engineering - Materials and Components

1. 

The temperature at which some materials become superconductors is called

A. Transition temperature
B. Curie temperature
C. Neel temperature
D. Onnes temperature

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

2. 

In Fermi-Dirac statistics, the probability of electron occupation of an energy level equal to Fermi level is

A. 0
B. 0.25
C. 0.5
D. 1

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

3. 

The quantum numbers associated with electron motion are designed as

A. a, b, c
B. h, k, l
C. n, m, l
D. h, n, l

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

4. 

The carrier mobility in a semiconductor is 0.4 m2/Vs. Its diffusion constant at 300 K will be (in m2/s)

A. 0.40
B. 0.16
C. 0.04
D. 0.01

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

5. 

Which of these has lowest dielectric strength?

A. Dry air
B. Wet air
C. Cotton
D. Paper

Answer: Option B

Explanation:

Cotton and paper have higher dielectric strength than air. Moisture decreases dielectric strength.


1 2 3 4 5 6 7 8 Next »