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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
ANSWER
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
ANSWER
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
ANSWER
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
ANSWER
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
ANSWER
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
ANSWER
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
ANSWER
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
ANSWER
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 beElectrical DC Circuit MCQs

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

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 Electrical DC Circuit MCQs

  1. 10 A
  2. 5 A
  3. 12 A
  4. 6 A
ANSWER
EXPLANATION

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