Multiple Choice Questions (MCQ) with Answers on DC Circuits
1-The nucleus of an atom consists of
- Protons
- Neutrons
- Protons and Neutrons
- Electrons and Protons
(Ans: c)
2-A body contains electrons more than its normal number has
- +ve charge
- –ve charge
- No charge
- None of the above
(Ans: b)
3-The SI unit for measurement of electric charge is
- volt
- columb
- ohm
- farad
(Ans: b)
4-One columb is approximately equal to
- 624 x 10^12
- 624 x 10^14
- 624 x 10^16
- 624 x 10^18
(Ans: c)
5-The ____ is responsible for the current to flow in a closed circuit.
- Electric charge
- Potential difference
- Resistance
- All of the above
(Ans: b)
6-Any charged conductor, which receives electricity from the earth, when connected to it, is said to be
- Zero potential
- –ve potential
- +ve potential
- None of the above
(Ans: b)
7-Resistance of a wire is directly proportional to its
- Length
- Diameter
- Area of cross section
- All of the above
(Ans: a)
8-Reciprocal of resistance is called
- Resistivity
- Conductance
- Resonance
- 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
- 0.96 ohm
- 0.48 ohm
- 1.82 ohm
- 1.44 ohm
(Ans: a)
10-The following is (are) the semiconductor(s)
- Silicon
- Germanium
- Carbon
- All of the above
(Ans: d)
11-The resistance of pure metallic conductor _____ with the _______ in temperature.
- increases, increase
- increases, decrease
- remains same, increase
- remains same, decrease
(Ans: a)
12-One kilowatt equals to _____ horse power.
- 1.26
- 1.36
- 1.46
- 1.56
(Ans: b)
13-The output of motor in watts when it takes a power of 3kw and its efficiency is 75%, is
- 2000
- 2250
- 2500
- 2750
(Ans: b)
14-If three resistance (R1, R2 & R3) are connected in series then
- V = IR1 + IR2 + IR3
- V = I/R1 + I/R2 + I/R3
- I = VR1 + VR2 + VR3
- 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
- branch currents are additive
- conductances are additive
- powers are additive
- All of the above
(Ans: d)