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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 4
1.

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

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

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

Valence bond results in hardness.

2.
The chemical properties of atoms are determined by all the electrons and their configuration.
True
False
Answer: Option
Explanation:

Chemical properties are governed by valence electrons only.

3.
Nichrome is used for
overload line wires
heater coils
lamp filaments
all of the above
Answer: Option
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.
kT 0.025 eV
kT 0.5 eV
kT 1 eV
kT 100 eV
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
If the valence electron is separated from a copper atom, the remaining part of atom has a net charge of
1
- 1
0
+ 3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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