Sparking occurs when a load is switched off because the circuit has high_________?

A. resistance
B. inductance
C. capacitance
D. impedance

Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?

A. 1/9 times
B. 3 times
C. 9 times
D. unchanged

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?

A. decrease
B. increase
C. remain constant
D. none of the above

A field of force can exist only between_____________?

A. two molecules
B. two ions
C. two atoms
D. two metal particles

A substance whose molecules consist of dissimilar atoms is called____________?

A. semi-conductor
B. super-conducto
C. compound
D. insulator

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

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?

A. 9 times
B. 1/9 times
C. 1/3 times
D. 3 times

Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?

A. 3/2 Q
B. 6 Q
C. 4 Q
D. 8/3 Q

Ohm’s law is not applicable to__________?

A. semi-conductors
B. D. C. circuits
C. small resistors
D. high currents

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?

A. 160 ohms
B. 80 ohms
C. 20 ohms
D. 10 ohms