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

Which of the following statement is true both for a series and a parallel D. C. circuit?

A. Elements have individual currents
B. Currents are additive
C. Voltages are additive
D. Power are additive

Two resistors are said to be connected in series when___________?

A. Same current passes in turn through both
B. Both carry the same value of current
C. Total current equals the sum of branch currents
D. Sum of ir drops equals the applied e.m.f.

You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?

A. Two in parallel
B. Two in parallel and one in series
C. Three in parallel
D. Three in series

Which of the following material has nearly zero temperature co-efficient of resistance_________?

A. Manganin
B. Porcelain
C. Carbon
D. Copper

Current velocity through a copper conductor is___________?

A. The same as propagation velocity of electric energy
B. Independent of current strength
C. Of the order of a few ^.s/m
D. Nearly 3 x 108 m/s

A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?

A. 6.4 a, 6.9 a
B. 6.4 a, 9.6 a
C. 4.6 a, 6.9 a
D. 4.6 a, 9.6 a

The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?

A. 18 q
B. 36 q
C. 48 q
D. 64 q

A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?

A. 400 q
B. 600 q
C. 800 q
D. 1000 q