Electronics and Communication Engineering - Materials and Components

1. 

The number of protons in a silicon atom are

A. 4
B. 8
C. 12
D. 14

Answer: Option D

Explanation:

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

2. 

The fact that domains exhibits spontaneous magnetisation is

A. first hypothesis is of Curie
B. second hypothesis is of Weiss
C. Curie-Weiss law
D. Boltzmann's statistics

Answer: Option B

Explanation:

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3. 

Assertion (A): Hall effect is used to determine whether the semi- conductor is p or n type.

Reason (R): Under the influence of field, holes and electrons move in opposite direction.

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:

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4. 

The most important set of specifications of transformer oil include

A. dielectric strength and viscosity
B. dielectric strength and flash point
C. viscosity and flash point
D. flash point and viscosity

Answer: Option A

Explanation:

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5. 

Nickel is a non-magnetic material.

A. True
B. False

Answer: Option B

Explanation:

Nickel is ferromagnetic material.


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