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# Electrical DC Circuits MCQs

1) A DC circuit has ……….. as a load.

1. resistance
2. inductance
3. capacitance
4. all of the above
EXPLANATION

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

1. increase the circuit current
2. utilize electrical energy
3. decrease the circuit current
4. none of the above
EXPLANATION

3) Electrical appliances are not connected in series because

1. series circuit is complicated
2. power loss is more
3. appliances have different current ratings
4. none of the above
EXPLANATION

4) Electrical appliances are connected in parallel because it

1. is a simple circuit
2. draws less current
3. results in reduced power loss
4. makes the operation of appliances independent of each other
EXPLANATION

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

1. 29 V
2. 13.5 V
3. 14 V
4. 18 V
EXPLANATION

6) Two bulbs B1 100 W, 200 V and B2 40 W, 200 V are connected in series across 200 V battery, the total circuit resistance will be

1. 1000 Ω
2. 400 Ω
3. 1400 Ω
4. 135 Ω
EXPLANATION

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

1. greater than the smallest resistance
2. between the smallest and greatest resistance
3. less than the smallest resistance
4. none of the above
EXPLANATION

8) When cells are arranged in parallel

1. the current capacity increases
2. the current capacity decreases
3. the e.m.f decreases
4. the e.m.f increases
EXPLANATION

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

1.  3 A
2.  6 A
3.  2.5 A
4. 1.5 A
EXPLANATION

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

1. 2(E – V)V/r
2. 2(E – V)r/E
3. (E – V)r
4. ((E – V)/V)r
EXPLANATION

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

1. R < r
2. R > r
3. R = r
4. none of the above
EXPLANATION

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

1. 6 Ω
2. 3 Ω
3. 12 Ω
4. 24 Ω
EXPLANATION

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

1. 50/4 Ω
2. 4/50 Ω
3. 200 Ω
4. 1/200 Ω
EXPLANATION

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

1. 0.5 V
2. 1.95 V
3. 1.9 V
4. 2 V