The document contains 20 multiple choice questions about electricity. It covers topics like units of electric power, Ohm's law, conductors and insulators, Coulomb's law, electric circuits, and more. Correct answers are provided for each question to test understanding of key concepts in electricity.

1. Electricity
1.Which of the following is the commercial unit of electric power?
[A] Joule
[B] KWh
[C] Watt
[D] Ampere
2.What is the work done to move a unit charge from point to another called as?
[A] Current
[B] Resistance
[C] Conductance
[D] Potential Difference
3.As per Ohm’s law, if the resistance of a conductor is doubled, what will be the
effect on the current flowing through it?
[A] it gets doubled
[B] it gets halved
[C] it increases 4 times
[D] No change
4.Which of the following metals is mostly used for filaments of electric bulbs?
[A] Copper
[B] Silver
[C] Nickel
[D] Tungsten

2. Electricity
5.What is the property of a conductor to resist the flow of charges known as?
[A] Conductance
[B] Conductivity
[C] Resistance
[D] Electric Potential
6.What of the following represents Ohm’s law (V= potential difference and
I=current)?
[A] V = I 2
[B] V = 1/I
[C] V/I = constant
[D] None of the above
7.Which of the following is true about metals?
[A] They are good conductors of electricity
[B] They have low resistivity
[C] Both a and b
[D] None of the above
8.Which of the following is an example of insulator?
[A] Diamond
[B] Mercury
[C] Iron
[D] Chromium

3. Electricity
9.Which of the following is true about the force between two point charges as per
the Coulomb’s law?
[A] inversely as the square of the distance between the charges
[B] directly proportional to the product of the magnitude of the two charges
[C] Both a and b
[D] None of the above
10.What is the value of permittivity of free space?
[A] 8.854 × 10–10 C2 N–1 m–2
[B] 8.854 × 10–11 C2 N–1 m–2
[C] 8.854 × 10–12 C2 N–1 m–2
[D] 8.854 × 10–13 C2 N–1 m–2
11.What is the total charge of the electric dipole?
[A] 0
[B] -1
[C] +1
[D] None of the above
12.What do we call the rate at which electric energy is dissipated or consumed in
an electric circuit?
[A] Conductance
[B] Power
[C] Resistance
[D] Potential Difference

4. Electricity
13.What is current density?
[A] Current per unit volume
[B] Current per unit area
[C] Charge per unit area
[D] None of the above
14.What do we call the magnitude of the drift velocity per unit electric field?
[A] Current Density
[B] Mobility
[C] Conductance
[D] Resistance
15.What number does orange colour represent in the resistance colour code?
[A] 1
[B] 2
[C] 3
[D] 4
16.Which of the following represents Electric Power (V=Voltage, I=Current)?
[A] V x I
[B] V/I
[C] 2( V x I)
[D] 1/VI

5. Electricity
17.What is the S.I. unit of electric charge?
[A] Ampere
[B] Coulomb
[C] Joule
[D] Watt
18.Which of the following represents the unit ampere?
[A] Kg/metre
[B] coulomb/metre
[C] coulomb/second
[D] Kg/coulomb
19.How many electrons constitutes a 1 coulomb charge?
[A] 3 × 1016
[B] 6 × 1018
[C] 9 × 1021
[D] 1
20.On which of the following does the resistance of a conductor depend?
[A] Length
[B] Area of cross-section
[C] Nature of material
[D] All of the above