International ohm is defined in terms of the resistance of________________?
(A) a column of mercury
(B) a cube of carbon
(C) a cube of copper
(D) the unit length of wire
A substance whose molecules consist of dissimilar atoms is called____________?
(A) semi-conductor
(B) super-conducto
(C) compound
(D) insulator
The number of electrons in the outer most orbit of carbon atom is___________?
(A) 3
(B) 4
(C) 6
(D) 7
The ratio of mass of proton to that of electron is nearly_____________?
(A) 1840
(B) 1840
(C) 30
(D) 4
Voltage dependent resistors are used_____________?
(A) for inductive circuits
(B) to supress surges
(C) as heating elements
(D) as current stabilizers
Voltage dependent resistors are usually made from________________?
(A) Charcoal
(B) Silicon Carbide
(C) Nichrome
(D) Graphite
All good conductors have high____________?
(A) conductance
(B) resistance
(C) reluctance
(D) thermal conductivity
are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?
(A) Varistors
(B) Thermistor
(C) Semi-conductors
(D) Variable resistors
An open resistor, when checked with an ohm-meter reads_____________?
(A) zero
(B) infinite
(C) high but within tolerance
(D) low but not zero
A rheostat differs from potentiometer in the respect that it_____________?
(A) has lower wattage rating
(B) has higher wattage rating
(C) has large number of turns
(D) offers large number of tapping