Q1. A perfect conductor has
(a) Zero conductivity
(b) unity conductivity
(c) infinite conductivity
(d) none of the above
Ans:c
Q2. The conductivity of a conductor
can be increasingly
(a) decreasing its temperature
(b) increasing its temperature
(c) decreasing its vibration
(d) increasing its vibration
Ans: a
Q3. Which of the following
are no-conductors of electricity ?
(a) Non-metal solids except carbon
(b) Air and most other gases
(c) Pure water and liquids
(d) All of the above
Ans:d
Q4. Unit of electrical conductivity
(a) mho/metre (b) mho/sq.m (c)ohm/metre (d)ohm/sq.m
Ans:a
Q5.Resistance of a material always decreases I
(a) temperature of material is decreased
(b)temperature of material is increased
(c)number of free electrons available become more
(d)none of the above is correct
Ans:c
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