Materials And Components MCQ Questions & Answers

41

As the atoms of rare gases become larger, electronic polarizability

A) Increases B) Decreases C) Remains the same D) May increase or decrease

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Answer & Solution

Answer: Option C

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42

Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

A) Normal to both current and magnetic field B) In the same direction as current C) In a direction anti parallel to magnetic field D) None of the above

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Answer & Solution

Answer: Option A

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43

The phenomenon of dielectric hysteresis occurs with

A) DC B) AC C) Both AC and DC D) None of the above

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Answer & Solution

Answer: Option B

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44

When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.

A) True B) False

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Answer & Solution

Answer: Option A

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45

The unit for mmf is

A) A B) Wb C) T D) V

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Answer & Solution

Answer: Option A

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46

When a material is in superconducting state and a magnetic field is applied

A) The superconducting property is not affected B) The superconducting property may be affected and resistivity may increase from zero to a low value C) The superconducting property may be destroyed D) The material may become an insulator

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Answer & Solution

Answer: Option C

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47

The characteristic impedance of coaxial cable depends on

A) Ratio of outer and inner diameter B) Length of the cable C) Logarithmic ratio of outer and inner diameter D) Logarithmic ratio of outer and inner diameter and inversely as the square root of dielectric constant

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Answer & Solution

Answer: Option D

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48

Consider the following statements relating to piezoelectric materials and their effects:
1. Stress applied to the material produces electric polarization
2. An electric field applied to the material produces strain in it
3. All piezoelectric material are also ferroelectric materials
Which of the statements given above are correct?

A) 1 and 3 B) 1 and 2 C) 2 and 3 D) 1, 2 and 3

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Answer & Solution

Answer: Option B

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49

The detailed information regarding the mechanism of fracture is available from microscopic examination, normally using scanning electron microscopy, and its study is termed as

A) Microscopic B) Fractographic C) Atroscopic D) Nanoscopic

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Answer & Solution

Answer: Option B

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50

In an intrinsic semiconductor-

A) Only electrons carry current B) Both electrons and holes carry current C) Both electrons and holes carry current with holes being the minority carriers D) Only holes carry current

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Answer & Solution

Answer: Option B

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Materials And Components MCQ Questions & Answers | ECE