Multiple Choice Questions (MCQ) with Answers on DC Circuits

Multiple Choice Questions (MCQ) with Answers on DC Circuits

 

1-The nucleus of an atom consists of

  1. Protons
  2. Neutrons
  3. Protons and Neutrons
  4. Electrons and Protons

(Ans: c)

 

2-A body contains electrons more than its normal number has

  1. +ve charge
  2. –ve charge
  3. No charge
  4. None of the above

(Ans: b)

 

3-The SI unit for measurement of electric charge is

  1. volt
  2. columb
  3. ohm
  4. farad

(Ans: b)

 

4-One columb is approximately equal to

  1. 624 x 10^12
  2. 624 x 10^14
  3. 624 x 10^16
  4. 624 x 10^18

(Ans: c)

 

5-The ____ is responsible for the current to flow in a closed circuit.

  1. Electric charge
  2. Potential difference
  3. Resistance
  4. All of the above

(Ans: b)

 

6-Any charged conductor, which receives electricity from the earth, when connected to it, is said to be

  1. Zero potential
  2. –ve potential
  3. +ve potential
  4. None of the above

(Ans: b)

 

7-Resistance of a wire is directly proportional to its

  1. Length
  2. Diameter
  3. Area of cross section
  4. All of the above

(Ans: a)

 

8-Reciprocal of resistance is called

  1. Resistivity
  2. Conductance
  3. Resonance
  4. None of the above

(Ans: b)

 

9-A coil consists of 8 turns of copper wire have cross section area of 1mm^2. The resistance of the coil, when mean length per turn is 0.02μΩm, is

  1. 0.96 ohm
  2. 0.48 ohm
  3. 1.82 ohm
  4. 1.44 ohm

(Ans: a)

 

10-The following is (are) the semiconductor(s)

  1. Silicon
  2. Germanium
  3. Carbon
  4. All of the above

(Ans: d)

 

11-The resistance of pure metallic conductor _____ with the _______ in temperature.

  1. increases, increase
  2. increases, decrease
  3. remains same, increase
  4. remains same, decrease

(Ans: a)

 

12-One kilowatt equals to _____ horse power.

  1. 1.26
  2. 1.36
  3. 1.46
  4. 1.56

(Ans: b)

 

13-The output of motor in watts when it takes a power of 3kw and its efficiency is 75%, is

  1. 2000
  2. 2250
  3. 2500
  4. 2750

(Ans: b)

 

14-If three resistance (R1, R2 & R3) are connected in series then

  1. V = IR1 + IR2 + IR3
  2. V = I/R1 + I/R2 + I/R3
  3. I = VR1 + VR2 + VR3
  4. I = V/R1 + V/R2 + V/R3

Where V=Potential difference, I=Current

(Ans: a)

 

15-When the resistances are connected in parallel circuit then

  1. branch currents are additive
  2. conductances are additive
  3. powers are additive
  4. All of the above

(Ans: d)