321. The condition for the validity under Ohm’s law is that_______________?
A. resistance must be uniform
B. current should be proportional to the size of the resistance
C. resistance must be wire wound type
D. temperature at positive end should be more than the temperature at negative end
322. Which of the following statement is correct_______________?
A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator
B. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
C. A semi-conductor is one which con¬ducts only half of the applied voltage
D. A semi-conductor is a material made of alternate layers of conducting material and insulator
323. 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
324. An open resistor, when checked with an ohm-meter reads_____________?
A. zero
B. infinite
C. high but within tolerance
D. low but not zero
325. are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?
A. Varactors
B. Thermistor
C. Semi-conductors
D. Variable resistors
326. All good conductors have high____________?
A. conductance
B. resistance
C. reluctance
D. thermal conductivity
327. Voltage dependent resistors are usually made from________________?
A. Charcoal
B. Silicon Carbide
C. Nichrome
D. Graphite
328. Voltage dependent resistors are used_____________?
A. for inductive circuits
B. to suppress surges
C. as heating elements
D. as current stabilizers
329. The ratio of mass of proton to that of electron is nearly_____________?
A. 1840
B. 1840
C. 30
D. 4
330. The number of electrons in the outer most orbit of carbon atom is___________?
A. 3
B. 4
C. 6
D. 7
NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
THANK YOU