Electronics and Communication Engineering - Materials and Components

26. 

If there are no permanent dipoles in a dielectric material, the dielectric constant is independent of temperature.

A. True
B. False

Answer: Option A

Explanation:

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

27. 

Assertion (A): Magnetic susceptibility of copper is -0.5 x 10-5.

Reason (R): Copper is diamagnetic material.

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:

If magnetic susceptibility is very low μ, is nearly equal to 1 and the material is diamagnetic.


28. 

An electron shell corresponding to principal quantum number n can contain a maximum of

A. n2 electrons
B. 2n2 electrons
C. 2n electron
D. n3 electron

Answer: Option B

Explanation:

The electron shell corresponding to the principal quantum number can contain no more than 2n2 electrons.


29. 

A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will

A. increase
B. decrease
C. remain the same
D. may increase or decrease

Answer: Option A

Explanation:

Bakelite has higher permittivity than air.


30. 

The spin angular momentum along a given direction is either or .

A. True
B. False

Answer: Option A

Explanation:

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