Category: Electrical Engineering Materials

A. Aluminium is a noble metal
B. Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
C. No reaction with oxygen occurs ft Any of the above

A. decreasing its temperature
B. increasing its temperature
C. decreasing its vibration
D. increasing its vibration

A. smoky and dirty atmosphere
B. humidity in the atmosphere
C. both (A) and (b)
D. neither (A) nor (b)

A. covalent
B. metallic
C. Vander Waals
D. Vander Waals and covalent

A. highest conductivity
B. lowest temperature co-efficient
C. good mechanical strength
D. good corrosion resistance
E. easy solderable and drawable quality
F. all of the above

A. intensity
B. speed
C. frequency
D. wave length

A. positive ions only
B. negative ions only
C. positive and negative ions
D. electrons and holes

A. Non-metal solids except carbon
B. Air and most other gases
C. Pure water and liquids in general except mercury
D. All of the above

A. extrnisic
B. intmisic
C. N-type
D. P-type

A. Composition
B. Pressure
C. Size
D. Temperature