Physics Quiz: Electricity

Time allowed: 45 minutes Total marks: 30

Section A: Multiple Choice

  1. Which particle is the primary carrier of negative charge in metals?
    a) Protons
    b) Neutrons
    c) Electrons
    d) Ions


  2. What is the value of the elementary charge (e)?
    a) $1.6 \times 10^{-19}\text{ C}$
    b) $1.6 \times 10^{19}\text{ C}$
    c) $6.25 \times 10^{-18}\text{ C}$
    d) $1.0 \times 10^{-19}\text{ C}$


  3. In an electric field, field lines are drawn from:
    a) Negative to positive
    b) Positive to negative
    c) Center to periphery
    d) North to south


  4. Which of the following increases the resistance of a wire?
    a) Increasing the cross-sectional area
    b) Decreasing the length
    c) Decreasing the temperature
    d) Increasing the length


  5. The rate of flow of electric charge is called:
    a) Voltage
    b) Resistance
    c) Current
    d) Power


  6. Conventional current flows in which direction?
    a) Negative terminal to positive terminal
    b) Positive terminal to negative terminal
    c) From higher resistance to lower resistance
    d) Randomly in all directions

Section B: Short Answer

Answer the following questions in the space provided. Marks are indicated in brackets.

  1. Describe the process of charging a material by friction. Use the example of a balloon and hair. (3 marks)

  2. Distinguish between charging by conduction and charging by induction. (4 marks)

  3. Explain why metals are better conductors of electricity than non-metals, referring to their atomic structure. (3 marks)

  4. A charge of $12\text{ C}$ flows through a conductor in $4\text{ seconds}$. Calculate the current. (3 marks)
    • Formula:
    • Substitution:
    • Answer:

  5. State Ohm’s Law and provide the mathematical formula relating voltage, current, and resistance. (3 marks)

  6. A heating element has a resistance of $20\ \Omega$ and a current of $5\text{ A}$ flows through it.
    a. Calculate the voltage across the element. (2 marks)
    b. Calculate the electrical power dissipated as heat. (2 marks)

  7. How does an increase in temperature typically affect the resistance of a conductor? Explain why this happens. (3 marks)

  8. Define “Electromotive force (e.m.f)” and explain how it differs from “Potential Difference (p.d)”. (3 marks)

Attempt the quiz before checking the mark scheme
Mark Scheme P5 - Electricity Mark Scheme
Topic guide: P5 - Electricity