arrow_backBack to Study Resources

Quiz Chapter 7: Electricity and Magnetism

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

Question 1 of 10Score: 0

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

Full Question List & Answer Key

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

1. 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
Show answer

Answer: B

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

2. 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
Show answer

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.

3. In a series circuit containing three identical 3 Ω resistors, what is the total effective resistance?

  1. 1 Ω
  2. 3 Ω
  3. 6 Ω
  4. 9 Ω
Show answer

Answer: D

In a series circuit, total resistance R_total = R1 + R2 + R3 = 3 Ω + 3 Ω + 3 Ω = 9 Ω.

4. 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
Show answer

Answer: B

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

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

  1. Volt (V)
  2. Ohm (Ω)
  3. Ampere (A)
  4. Joule (J)
Show answer

Answer: C

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

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
Show answer

Answer: B

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

7. An electric circuit powered by a 12 V battery draws a current of 2 A. According to Ohm's Law (V = IR), what is the total resistance of the circuit?

  1. 6 Ω
  2. 24 Ω
  3. 0.16 Ω
  4. 10 Ω
Show answer

Answer: A

Resistance R = VI = 12 V2 A = 6 Ω.

8. How should an Ammeter and a Voltmeter be connected to measure electric current and potential difference across a bulb, respectively?

  1. Ammeter in parallel; Voltmeter in series
  2. Ammeter in series; Voltmeter in parallel
  3. Both in series
  4. Both in parallel
Show answer

Answer: B

An ammeter must be placed in series to measure total current passing through, while a voltmeter must be placed in parallel across the component to measure potential difference.

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

  1. Loses electrons
  2. Gains electrons
  3. Gains protons
  4. Loses neutrons
Show answer

Answer: B

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

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
Show answer

Answer: B

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

Sponsored