Magnetism and Electricity Quiz

Grade 6 · Science · Quiz

Test your knowledge of magnets, electric circuits, Ohm's Law, and electromagnetism.

Questions

1. What is an electromagnet?

   1. A permanent magnet found in nature
   2. A magnet created by passing electricity through a coil of wire
   3. A magnet that only works at cold temperatures
   4. A type of battery
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   Answer: A magnet created by passing electricity through a coil of wire

   Electromagnets use current-carrying coils wrapped around iron cores. Unlike permanent magnets, you can turn them on and off and control their strength.

2. Earth acts like a giant magnet because of its iron core.

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   Answer: True

   Earth's outer core contains molten iron that circulates, generating electric currents that produce Earth's magnetic field — acting like a bar magnet tilted slightly from Earth's axis.

3. What does a compass needle align with?

   1. The nearest metal object
   2. Earth's geographic North Pole exactly
   3. Earth's magnetic field
   4. The sun's position
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   Answer: Earth's magnetic field

   A compass needle is a small magnet that aligns with Earth's magnetic field lines. Note: Earth's magnetic north pole is actually a geographic south pole magnetically.

4. Electric current is measured in units called ___.

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   Answer: amperes

   Amperes (or amps, A) measure the flow rate of electric charge (electrons) through a conductor. One ampere = 6.24 × 10^18 electrons per second.

5. In a series circuit with 3 light bulbs, what happens if the second bulb burns out?

   1. Only the second bulb goes out
   2. All three bulbs go out
   3. The first and third bulbs stay on
   4. The circuit generates more power
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   Answer: All three bulbs go out

   In a series circuit, all components share a single path. A break anywhere in the circuit stops current flow through the entire circuit.

6. Voltage measures how much resistance a material has to electric current.

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   Answer: False

   Voltage (V) measures the electrical pressure or potential difference that drives current. Resistance (Ω) measures opposition to current flow.

7. Using Ohm's Law (V = IR), if the current is 2A and resistance is 6Ω, what is the voltage?

   1. 3 V
   2. 8 V
   3. 12 V
   4. 0.33 V
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   Answer: 12 V

   Using Ohm's Law: V = IR = 2A × 6Ω = 12 Volts.

8. Opposite magnetic poles ___ each other.

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   Answer: attract

   Opposite poles (north and south) attract each other. Like poles (both north or both south) repel.

9. Home electrical wiring uses parallel circuits primarily because:

   1. It uses less electricity
   2. Each device can work independently
   3. It is cheaper to build
   4. Parallel circuits have no resistance
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   Answer: Each device can work independently

   In parallel wiring, each outlet and appliance has its own circuit branch. Turning off one device or replacing one bulb doesn't affect the others.

10. An electric generator converts mechanical energy into electrical energy using electromagnetic induction.

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    Answer: True

    Generators use electromagnetic induction — spinning a coil of wire inside a magnetic field converts mechanical motion (from turbines, engines) into electrical current.

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