Materials And Components - Study Mode

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[#131] 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

Correct Answer

(C) 1 and 3 only

[#132] Which one of the following is commonly used piezoelectric ceramics?

(A) Yttrium oxide (Y 2 O 2 )

(B) Boron carbide (B 4 C)

(C) Barium titanate (BaTiO 3 )

(D) Tungsten carbide (WC)

Correct Answer

(C) Barium titanate (BaTiO 3 )

[#133] 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

Correct Answer

(A) Less than unity

[#134] 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

Correct Answer

(A) 1, 2 and 3

[#135] 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

Correct Answer

(D) 1, 2 and 3