Electronics and Communication Engineering - Materials and Components

1. 

Assertion (A): Diamond and carborudum are both very hard materials.

Reason (R): Valence band can be extremely strong.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option A

Explanation:

Valence bond results in hardness.


2. 

The chemical properties of atoms are determined by all the electrons and their configuration.

A. True
B. False

Answer: Option B

Explanation:

Chemical properties are governed by valence electrons only.


3. 

Nichrome is used for

A. overload line wires
B. heater coils
C. lamp filaments
D. all of the above

Answer: Option B

Explanation:

Because heater coil must be made of high resistivity material.


4. 

If k is Boltzmann's constant and T is absolute temp, then at room temp.

A. kT 0.025 eV
B. kT 0.5 eV
C. kT 1 eV
D. kT 100 eV

Answer: Option A

Explanation:

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

5. 

If the valence electron is separated from a copper atom, the remaining part of atom has a net charge of

A. 1
B. - 1
C. 0
D. + 3

Answer: Option A

Explanation:

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

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