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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 1
11.
The number of valence electrons in pentavalent impurity is
5
4
3
1
Answer: Option
Explanation:

Pentavalent means 5 valence electrons.

12.
If the diameter of a wire is doubled, its current carrying capacity becomes
one-fourth
half
twice
four times
Answer: Option
Explanation:

Current carrying capacity depends on area of cross-section.

13.
The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is
Ohm's law
Gauss law
Ampere's law
Biot-Savart law
Answer: Option
Explanation:

It is another form of Ohm's law.

14.

Assertion (A): Silicon is less sensitive to changes in temperature than germanium.

Reason (R): Cut in voltage in silicon is less than that in germanium.

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:

Cut in voltage of silicon is higher than that in germanium.

15.
Material which lack permanent magnetic dipoles are known as
paramagnetic
diamagnetic
ferromagnetic
ferrimagnetic
Answer: Option
Explanation:

Diamagnetic materials have no permanent magnetic diploes.

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