Electronics and Communication Engineering - Electronic Devices and Circuits

6. 

The energy of one quantum of light equal to hf.

A. True
B. False

Answer: Option A

Explanation:

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7. 

For most metals, Fermi level EF is less than

A. 0.1 eV
B. 2 eV
C. 5 eV
D. 10 eV

Answer: Option D

Explanation:

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8. 

The spins in a ferrimagnetic material are

A. all aligned parallel
B. partially aligned antiparallel without exactly cancelling out sublattice magnetisation
C. randomly oriented
D. all aligned antiparallel such that the sublattice cancels out exactly

Answer: Option B

Explanation:

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9. 

The permeability of soft iron can be increased by

A. purifying it
B. reducing carbon percentage
C. alloying with cobalt
D. increasing percentage

Answer: Option C

Explanation:

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10. 

All of the following elements have three valence electrons EXCEPT

A. boron
B. indium
C. gallium
D. arsenic

Answer: Option D

Explanation:

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