Which method can be used for absolute measurement of resistances?
A. Lorentz method
B. Releigh method
C. Ohm’s law method
D. Wheatstone bridge method
Author: Aroma Ann
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 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
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
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 substance whose molecules consist of dissimilar atoms is called __________?
A. semi-conductor
B. super-conductor
C. compound
D. insulator
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
A field of force can exist only between __________?
A. two molecules
B. two ions
C. two atoms
D. two metal particles
Sparking occurs when a load is switched off because the circuit has high __________?
A. resistance
B. inductance
C. capacitance
D. impedance
