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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. An uncharged object becomes negatively charged when it undergoes which process?

  1. Loses electrons
  2. Gains electrons
  3. Gains protons
  4. Loses neutrons
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Answer: B

Gaining additional electrons creates an excess of negative charge over positive protons, giving the object a net negative charge.

2. 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.

3. What electrostatic hazard is prevented by attaching heavy metallic earthing chains to fuel tanker trucks?

  1. Engine overheating
  2. Sparks from accumulated static charges igniting flammable fuel vapors
  3. Tyre punctures from road friction
  4. Battery overcharging
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Answer: B

Friction between fuel and pipes/air builds static electricity; grounding chains continuously discharge charges safely to the ground to prevent explosive sparks.

4. Which rule is applied to determine the direction of the magnetic field around a straight current-carrying wire?

  1. Fleming's Left-Hand Rule
  2. Right-Hand Grip Rule
  3. Ohm's Law
  4. Archimedes' Principle
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Answer: B

The Right-Hand Grip Rule determines magnetic field direction: pointing the thumb in current flow direction causes fingers to curl in magnetic field direction.

5. 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.

6. How does the total effective resistance of a parallel circuit change as more parallel resistor branches are added?

  1. Total resistance increases
  2. Total resistance decreases
  3. Total resistance remains constant
  4. Total resistance becomes infinite
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Answer: B

Adding extra parallel paths gives current more alternative routes to flow, lowering overall effective resistance.

7. Which modification will INCREASE the magnetic field strength produced by an electromagnet solenoid?

  1. Decreasing the electric current
  2. Reducing the number of turns in the coil
  3. Inserting a soft iron core into the solenoid coil
  4. Replacing copper wire with plastic thread
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Answer: C

Inserting a soft iron core concentrates magnetic lines of force, greatly strengthening the electromagnet.

8. 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.

9. If the potential difference across a resistor is doubled while its resistance remains constant, what happens to the electric current?

  1. Current is halved
  2. Current doubles
  3. Current remains unchanged
  4. Current drops to zero
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Answer: B

Ohm's Law states I = VR. Current (I) is directly proportional to potential difference (V), so doubling V doubles I.

10. In a series circuit, how does potential difference (V) distribute across two lightbulbs with resistances of 2 Ω and 4 Ω?

  1. Both bulbs receive the exact same voltage regardless of resistance
  2. The 4 Ω bulb receives a higher portion of total voltage than the 2 Ω bulb
  3. The 2 Ω bulb receives all the voltage while the 4 Ω bulb receives zero
  4. Voltage is converted entirely into current
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Answer: B

In series circuits, total voltage divides proportionally across resistors (V = IR); higher resistance receives a larger share of voltage.

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