Electronics and Communication Engineering - Electronic Devices and Circuits

41. 

Consider the following statements about diamagnetic material and diamagnetism.

  1. The materials have negative magnetic susceptibility.
  2. At very low temperature diamagnetic materials.
Which of the statements given above is/are correct?

A. 1 only
B. 2 only
C. Both 1 and 2
D. neither 1 nor 2

Answer: Option A

Explanation:

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42. 

In a photo emissive device and emission efficiency is increased by

A. coating the cathode ray by an active materials
B. coating the cathode by an insulating material
C. heating the cathode
D. cooling the anode

Answer: Option A

Explanation:

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43. 

Materials in order of decreasing electrical conductivity are

A. aluminium, silver, gold, copper
B. gold, silver, copper, aluminium
C. copper, silver, gold, aluminium
D. silver, copper, gold, aluminium

Answer: Option D

Explanation:

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44. 

Transconductance characteristics of JFET depict the relation between

A. ID and VGS for different value of VDS
B. ID and VDS for different value of VGS
C. VGS and VDS for different values of ID
D. VDS and ID for different values of VGS

Answer: Option A

Explanation:

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45. 

The resistivity of intrinsic semiconductor material is about

A. 105 ohm-m
B. 103 ohm-m
C. 100 ohm-m
D. 1 ohm-m

Answer: Option D

Explanation:

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