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Quiz Chapter 7: Electricity and Magnetism

10 questions · Form 2 Science Bab 7: Electricity and Magnetism

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. What particles are transferred between two insulating materials when friction generates electrostatic charges?

  1. Protons
  2. Neutrons
  3. Electrons
  4. Positrons
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Answer: C

Static electric charges are formed by friction transferring negatively charged electrons from one object to another; protons remain fixed in atomic nuclei.

2. Why are copper wires widely used in electrical domestic circuits?

  1. Copper has very high electrical resistance
  2. Copper is a good electrical conductor with low electrical resistance
  3. Copper acts as an electrostatic insulator
  4. Copper generates magnetic fields without electric current
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Answer: B

Copper has low electrical resistance and high conductivity, allowing electric current to flow efficiently with minimal energy loss as heat.

3. What happens to the remaining light bulbs in a household parallel circuit if one light bulb burns out?

  1. All remaining bulbs immediately turn off
  2. The remaining bulbs stay lit with unchanged brightness
  3. The remaining bulbs become dimmer
  4. The battery explodes due to excessive current
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Answer: B

In parallel circuits, each branch operates on an independent electrical path; a broken branch does not interrupt current flow through other branches.

4. What type of electrical core material is ideal for constructing an electromagnet because it magnetizes quickly and loses magnetism when current stops?

  1. Hardened Steel
  2. Soft Iron
  3. Copper
  4. Aluminum
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Answer: B

Soft iron is a temporary magnetic material that magnetizes easily when current flows and demagnetizes quickly when turned off.

5. Which instrument is specifically used in laboratories to detect electrostatic charges and identify charge polarity?

  1. Ammeter
  2. Voltmeter
  3. Electroscope
  4. Rheostat
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Answer: C

An electroscope detects static charges through the divergence of its gold leaf caused by electrostatic repulsion.

6. Which practical appliance operates using an electromagnet?

  1. Electric kettle
  2. Electric bell
  3. Filament lamp
  4. Glass mirror
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Answer: B

Electric bells use electromagnets to pull a striker armature against a gong when the switch circuit closes.

7. Three identical 6 Ω resistors are connected in parallel across a battery. What is the effective total resistance of this parallel combination?

  1. 2 Ω
  2. 6 Ω
  3. 18 Ω
  4. 0.5 Ω
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Answer: A

1R_total = 16 + 16 + 16 = 36 = 12. Therefore, R_total = 2 Ω.

8. What is the direction of magnetic field lines surrounding a bar magnet?

  1. From South pole to North pole
  2. From North pole to South pole
  3. Circular around the center only
  4. From the positive terminal to the negative terminal
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Answer: B

By convention, magnetic field lines outside a magnet exit from the North pole and enter into the South pole.

9. When rubbing an ebonite rod with woolen cloth, the ebonite rod becomes negatively charged. What happened during rubbing?

  1. Protons transferred from wool to ebonite rod
  2. Electrons transferred from wool to ebonite rod
  3. Protons transferred from ebonite rod to wool
  4. Electrons transferred from ebonite rod to wool
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Answer: B

Friction causes electrons to move from the woolen cloth onto the ebonite rod, giving the ebonite rod an excess negative charge.

10. What is the primary unit used to measure electric current?

  1. Volt (V)
  2. Ohm (Ω)
  3. Ampere (A)
  4. Joule (J)
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Answer: C

Electric current is measured in Amperes (A) using an ammeter.

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