Basic Electrical Engineering objective questions (mcq) and answers

26.  Resistance of a wire always increases if

   A. Temperature is reduced

   B. Temperature is increased

   C. Number of free electrons available become less

   D. Number of free electrons available become more

27.  Pure metals generally have

   A. High conductivity and low temperature coefficient

   B. High conductivity and large temperature coefficient

   C. Low conductivity and zero temperature coefficient

   D. Low conductivity and high-temperature coefficient

28.  The temperature coefficient of resistance of an insulator is

   A. Positive and independent of temperature

   B. Negative and independent of temperature

   C. Negative and dependent on temperature

   D. Positive and dependent on temperature

29.  Specific resistance of a conductor depends upon

   A. Dimensions of the conductor

   B. Composition of contactor material

   C. Resistance of the conductor

   D. Both A and B

30.  Which of the following materials posses the least specific resistance?

   A. Aluminium

   B. Copper

   C. Silver

   D. Iron

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