Materials And Components MCQ Questions & Answers

91

Consider the following statements pertaining to the resistance of a conductor:
1. Resistance can be simply defined as the ratio of voltage across the conductor to the current through the conductor. This is, in fact, Georg Ohm's law
2. Resistance is a function of voltage and current
3. Resistance is a function of conductor geometry and its conductivity
Which of the above statements are correct?

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

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Answer & Solution

Answer: Option C

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92

Which one of the following is commonly used piezoelectric ceramics?

A) Yttrium oxide (Y₂O₂) B) Boron carbide (B₄C) C) Barium titanate (BaTiO₃) D) Tungsten carbide (WC)

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Answer & Solution

Answer: Option C

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93

The ratio of ionic radii of cations i.e. r_C and that of Anions i.e. r_A for stable and unstable ceramic crystal structure, is:

A) Less than unity B) Greater than unity C) Unity D) Either lesser or greater than unity

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Answer & Solution

Answer: Option A

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94

Which of the following are the advantages of Silicon over Insulator (SOI)?
1. Lower diffusion capacitance
2. Smaller parasitic delay and lower dynamic power consumption
3. Lower threshold voltages
Select the correct answer using the options given below.

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

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Answer & Solution

Answer: Option A

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95

Which of the following materials are used for high-technology applications?
1. Semi conductors
2. Bio materials
3. Smart materials

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

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Answer & Solution

Answer: Option D

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96

In a superconducting magnet, wires of superconducting material are embedded in the thick copper matrix, because while the material is in the superconducting state:

A) The leakage current passes through copper part B) Copper part helps in conducting heat away from the superconductor C) Copper part helps in overcoming the mechanical stress D) Copper acts as an insulating cover for superconductor

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Answer & Solution

Answer: Option C

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97

The energy gap of a superconductor

A) Is independent of temperature B) Increase with temperature C) Is maximum at a critical temperature D) Is minimum at a critical temperature

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Answer & Solution

Answer: Option D

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98

The most suitable material for making an LDR (Light dependent resistor) is a semiconductor material having

A) $${E_g} > > h\upsilon $$ B) $${E_g} > h\upsilon $$ C) $${E_g} = h\upsilon $$ D) $${E_g} < < h\upsilon $$

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Answer & Solution

Answer: Option D

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99

In an intrinsic semiconductor, the mobility of electron in the conduction band is

A) zero B) less than the mobility of holes in the valence band C) equal to mobility of holes in the valence band D) greater than the mobility of holes in the valence band

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Answer & Solution

Answer: Option D

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100

The ceramic materials are

A) Inorganic substances B) Brittle C) Good Thermal insulators D) All of the above

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Answer & Solution

Answer: Option D

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Materials And Components MCQ Questions & Answers | ECE