Electric Potential and Potential Energy

Electric Potential and Potential Energy MDCAT MCQs with answers

19 past paper MCQs on Electric Potential and Potential Energy, from the Electrostatics unit of MDCAT Physics. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.

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1.The formula $V=W/q$ represents: (MDCAT 2024)

  1. electric intensity
  2. electric power
  3. electric potential
  4. electric field gradient
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Correct answer: (c) electric potential

Potential is the work done per unit positive charge in bringing it from infinity to that point.

2.Find the potential difference in moving a 2 C charge which requires 600 J of work between two points. (MDCAT 2024)

  1. 1200 V
  2. 300 V
  3. 150 V
  4. 2400 V
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Correct answer: (b) 300 V

$V=W/q=600/2=300$ V.

3.How much power is used in moving a charge of \$0.03\,\mathrm{C}\$ from a point at \$40\,\mathrm{V}\$ to a point at \$60\,\mathrm{V}\$ in \$2\,\mathrm{s}\$? (UHS MDCAT 2017)

  1. $0.30\,\mathrm{W}$
  2. $0.15\,\mathrm{W}$
  3. $0.60\,\mathrm{W}$
  4. $0.012\,\mathrm{W}$
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Correct answer: (a) $0.30\,\mathrm{W}$

$W=q\Delta V=0.03\times20=0.6\,\mathrm{J}$, so $P=0.6/2=0.30\,\mathrm{W}$.

4.The work done in moving a unit positive charge from one point to another while keeping the charge in electrostatic equilibrium is called: (KMU MDCAT 2025)

  1. Kinetic energy
  2. Potential energy
  3. Elastic potential energy
  4. Potential difference
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Correct answer: (d) Potential difference

The work per unit charge in carrying it between two points is the potential difference.

5.The electric potential at a point due to a point charge is 100J/C. If a test charge of magnitude 1C placed at that point is replaced with a 2C charge, then the physical quantity that will change is: (SZABMU MDCAT 2025)

  1. Electric Field at that point
  2. Electric potential at that point
  3. Electric Potential Energy of the system
  4. Temperature
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Correct answer: (c) Electric Potential Energy of the system

The potential belongs to the source charge, but the energy $qV$ of the charge placed there doubles with $q$.

6.The formula V = W / qo represents (UHS MDCAT 2024)

  1. Electric intensity
  2. Electric power
  3. Electric potential
  4. Electric field gradient
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Correct answer: (c) Electric potential

Work per unit charge is the electric potential.

7.150.Find potential difference in moving 2 C charge which requires 600J of work between two points. (UHS MDCAT 2024)

  1. 1200V
  2. 300V
  3. 150V
  4. 2400V
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Correct answer: (b) 300V

$V=W/q=600/2$, which is $300\,\mathrm{V}$.

8.Electron Volt (eV) is another unit of (KMU MDCAT 2024)

  1. Charge
  2. Current
  3. Energy
  4. Power
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Correct answer: (c) Energy

An electron volt is the energy an electron gains through a potential difference of one volt.

9.A particle with charge 1C moves through potential difference 5V. Energy required: (NUMS MDCAT 2024)

  1. 5×10−10 J
  2. 8×10−18 J
  3. 8J
  4. 5J
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Correct answer: (d) 5J

$W=qV=1\times5$, which is $5\,\mathrm{J}$.

10.What is the potential difference between two points in an electric field if it takes 600 J of energy to move a charge of 2 C between these two points? (UHS MDCAT 2023)

  1. 1200 J
  2. 800 J
  3. 300 J
  4. 0 J
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Correct answer: (c) 300 J

$V=W/q=600/2$, which is $300\,\mathrm{V}$.

11.The SI unit of potential difference is: (SZABMU MDCAT 2023)

  1. Volt
  2. Coulomb
  3. Watt
  4. eV
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Correct answer: (a) Volt

Potential difference is measured in volts.

12.Electric potential is defined as: (SZABMU MDCAT 2023)

  1. Work per unit charge
  2. Force per unit charge
  3. Power per unit charge
  4. Force
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Correct answer: (a) Work per unit charge

Potential is the work done per unit charge in bringing it from infinity.

13.1eV is equal to: (SZABMU MDCAT 2023)

  1. 1.602 x 10-19 J
  2. 16.02 x 10-19 J
  3. 1620 J
  4. 162.0 x 10-19 J
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Correct answer: (a) 1.602 x 10-19 J

An electron volt is $1.602\times10^{-19}\,\mathrm{J}$.

14.Change in P.E per unit charge in the electric field is: (PMC MDCAT 2022)

  1. Electric potential
  2. Power
  3. K.E
  4. Work done
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Correct answer: (a) Electric potential

The change in potential energy per unit charge is the potential difference.

15.Electric potential determines the flow of? (PMC MDCAT 2022)

  1. Atom
  2. Molecule
  3. Compound
  4. Charge
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Correct answer: (d) Charge

Charge flows from a point of higher potential to one of lower potential.

16.The change in potential energy per unit charge between two points in an electric field is called: (PMC MDCAT 2022)

  1. Potential difference
  2. Absolute potential
  3. Electric Intensity
  4. Permitivity
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Correct answer: (a) Potential difference

The change in potential energy per unit charge is the potential difference.

17.Electrical potential energy between two charges at distance “r” is given by: (PMC MDCAT 2022)

  1. (k*q1*q2)/r
  2. (k*q1*q2)/r2
  3. k*q1*q2
  4. k*q1*q2/2r
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Correct answer: (a) (k*q1*q2)/r

The mutual potential energy of two point charges is $kq_1q_2/r$.

18.A particle, carrying a charge of 5e, falls through a potential difference of 25 V. What would be energy acquired by the particle in ‘J’. (UHS MDCAT 2019)

  1. 1.6 x 10-19J
  2. 125 J
  3. 125 x 10-19 J
  4. 125 x 1.6 x 10-19 J
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Correct answer: (d) 125 x 1.6 x 10-19 J

$W=qV=5e\times25$, that is $125\times1.6\times10^{-19}\,\mathrm{J}$.

19.How much power is used in moving a 0.03 C charge from point A at a potential of 40 V to point B at 60 V, if this takes 2 seconds? (UHS MDCAT 2017)

  1. 0.30 W
  2. 0.15 W
  3. 0.60 W
  4. 0.012 W
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Correct answer: (a) 0.30 W

$W=q\Delta V=0.03\times20=0.6\,\mathrm{J}$, and $0.6/2$ is $0.3\,\mathrm{W}$.

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