This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Ohm’s Law”.

1. An electric current of 10 A is the same as ___________

a) 10 J/C

b) 10 V/C

c) 10C/sec

d) 10 W/sec

2. Consider a circuit with two unequal resistances in parallel, then ___________

a) large current flows in large resistor

b) current is same in both

c) potential difference across each is same

d) smaller resistance has smaller conductance

3. Resistance of a wire is yΩ. The wire is stretched to triple its length, then the resistance becomes ___________

a) y/3

b) 3y

c) 6y

d) y/6

4. In which of the following cases is Ohm’s law not applicable?

a) Electrolytes

b) Arc lamps

c) Insulators

d) Vacuum ratio values

5. Which of the following bulbs will have high resistance?

a) 220V, 60W

b) 220V,100W

c) 115V,60W

d) 115V,100 W

6. Conductance is expressed in terms of ___________

a) mho

b) mho/m

c) ohm/m

d) m/ohm

7. A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is V. If the diameter of wire is made d/4, then drift velocity becomes ___________

a) V/16

b) 16V

c) V

d) V/4

8. Ohm’s law is not applicable to ___________

a) dc circuits

b) high currents

c) small resistors

d) semi-conductors

9. Resistivity of a wire depends on ___________

a) length of wire

b) cross section area

c) material

d) all of the mentioned

10. In a current-voltage relationship graph of a linear resistor, the slope of the graph will indicate ___________

a) conductance

b) resistance

c) resistivity

d) a constant