Varistors are______________?
(A) insulators
(B) non-linear resistors
(C) carbon resistors
(D) resistors with zero temperature coefficient
Which one of the following does not have negative temperature co-efficient ____________?
(A) Aluminium
(B) Paper
(C) Rubber
(D) Mica
A resistance having rating 10 ohms, 10 W is likely to be a__________?
(A) metallic resistor
(B) carbon resistor
(C) wire wound resistor
(D) variable resistor
For which of the following ‘ampere second’ could be the unit ?
(A) Reluctance
(B) Charge
(C) Power
(D) Energy
Which is the best conductor of electricity _______________?
(A) Iron
(B) Silver
(C) Copper
(D) Carbon
Ohm’s law is not applicable to____________?
(A) vacuum tubes
(B) carbon resistors
(C) high voltage circuits
(D) circuits with low current densities
Which of the following materials has a negative temperature co-efficient of resistance?
(A) Copper
(B) Aluminum
(C) Carbon
(D) Brass
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open_________________?
(A) there will be heavy current in the main line
(B) rest of the two bulbs will not light
(C) all three bulbs will light
(D) the other two bulbs will light
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
(A) 0.4 ohm
(B) 0.6 ohm
(C) 0.8 ohm
(D) 1.0 ohm
If a parallel circuit is opened in the main line, the current_______________?
(A) increases in the branch of the lowest resistance
(B) increases in each branch
(C) is zero in all branches
(D) is zero in the highest resistive branch