# MCQ on Electrical DC Circuits

1) A DC circuit has ……….. as a load.

- resistance
- inductance
- capacitance
- all of the above

2) The purpose of load in an electric circuit is to

- increase the circuit current
- utilize electrical energy
- decrease the circuit current
- none of the above

3) Electrical appliances are not connected in series because

- series circuit is complicated
- power loss is more
- appliances have different current ratings
- none of the above

4) Electrical appliances are connected in parallel because it

- is a simple circuit
- draws less current
- results in reduced power loss
- makes the operation of appliances independent of each other

5) Three resistance 14.5 Ω, 25.5 Ω and 60 Ω are connected in series across 200 V. What will be the voltage drop across 14.5 Ω

- 29 V
- 13.5 V
- 14 V
- 18 V

6) Two bulbs B_{1} 100 W, 200 V and B_{2} 40 W, 200 V are connected in series across 200 V battery, the total circuit resistance will be

- 1000 Ω
- 400 Ω
- 1400 Ω
- 135 Ω

7) When the number of resistance are connected in parallel, the total resistance is

- greater than the smallest resistance
- between the smallest and greatest resistance
- less than the smallest resistance
- none of the above

8) When cells are arranged in parallel

- the current capacity increases
- the current capacity decreases
- the e.m.f decreases
- the e.m.f increases

9) A battery of 24 V is applied across terminals AB of the circuit as shown in figure. The current in 2 Ω resistor will be

- 3 A
- 6 A
- 2.5 A
- 1.5 A

10) A cell of e.m.f E is connected across a resistance R. The potential difference between the terminals of the cell is found to be V. The instant resistance of the cell is

- 2(E – V)V/r
- 2(E – V)r/E
- (E – V)r
- ((E – V)/V)r

11) An external resistance R is connected to a cell of internal resistance r. The maximum current flows in the external resistance when

- R < r
- R > r
- R = r
- none of the above

12) A wire has a resistance of 12 Ω. It is bent in the form of a circle. The effective resistance between the two points on any diameter of the circle is

- 6 Ω
- 3 Ω
- 12 Ω
- 24 Ω

13) The total resistance of circuit by connecting 50 resistance of 1/4 Ω in parallel is

- 50/4 Ω
- 4/50 Ω
- 200 Ω
- 1/200 Ω

14) The internal resistance of a cell of e.m.f 2 V is 0.1 Ω. It is connected to a resistance of 3.9 Ω. The voltage across the cell is

- 0.5 V
- 1.95 V
- 1.9 V
- 2 V

15) If in a electrical DC circuit, a supply of 180 V is connected across terminal AB as shown in figure below, then the current in 6 Ω resistor will be

- 10 A
- 5 A
- 12 A
- 6 A