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Electrical Engineering Objective Questions { Material And Components }

15.  Plastics and glasses are
A. crystalline
B. liquid
C. solid solution
D. amorphous

16. The Miller indices of the diagonal plane of a cube are

17.  As the temperature increases, the vibrational frequency of the atoms in a solid
A. decreases
B. increases
C. may increase or decrease
D. remains constant

18.  At low temperatures, the mean free path and collision time are proportional to where T is the temperature in deg K
A. ferrimagnetic
B. diamagnetic
C. paramagnetic
D. ferromagnetic

19.  Which of the following statements is correct?
A. Copper has partially filled conduction band.
B. Diamond has completely filled conduction band but empty valence band
C. Silicon has a partially filled conduction band and an empty valence band.
D. The energy gap betwen conduction and valence bands in diamond is smaller than in silicon.

20.  X-rays are produced by I. bombarding metallic targets with high speed electrons 2. decelerating fast moving electrons 3. accelerating electrons to hig speeds 4. heating a filament to high temperature Select the correct answer using the codes given below :Codes :
A. 1 and 2 only
B. 3 and 4 only
C. 2 and 3 only
D. 1 and 4 only

21. Which of the following is not electromagnetic in nature?I. alpha raya 2. X-rays 3. gamma rays 4. cathode rays Select the correct answer using the codes given below : Codes :
A. 1 and 2 rays
B. 2 and 3 only
C. 3 and 3 only
D. 1 and 4 only

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