MCQ based on DC Circuit

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)