Electricity and magnetism Quiz - ICSE Class 7 Science

Free practice quiz: Electricity and magnetism (ICSE Class 7 Science). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following materials is the best conductor of electricity?

   1. Rubber
   2. Wood
   3. Copper
   4. Plastic
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   Answer: C. Copper

   Conductors are materials that allow electric current to flow easily. Copper is a metal known for its excellent conductivity due to the free movement of electrons in its atomic structure. Rubber, wood, and plastic are insulators, meaning they resist the flow of electricity.

2. Which of the following will NOT create a magnetic field?

   1. A current-carrying wire
   2. A permanent magnet
   3. A piece of iron placed near a magnet
   4. A stationary electric charge
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   Answer: D. A stationary electric charge

   Moving electric charges (electric current) and permanent magnets produce magnetic fields. A piece of iron placed near a magnet becomes magnetized and thus has a magnetic field. However, a stationary electric charge only produces an electric field, not a magnetic field.

3. In a circuit, adding more resistors in series will:

   1. Increase the total resistance
   2. Decrease the total resistance
   3. Keep the total resistance the same
   4. Make the circuit unstable
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   Answer: A. Increase the total resistance

   When resistors are connected in series, their resistances add up. Therefore, adding more resistors in series increases the total resistance of the circuit.

4. The opposition to the flow of electric charge is called:

   1. Current
   2. Voltage
   3. Conductance
   4. Resistance
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   Answer: D. Resistance

   Resistance is a property of a material that opposes the flow of electric current. It is measured in Ohms (Ω).

5. If you bring the North pole of one bar magnet near the South pole of another bar magnet, what will happen?

   1. They will repel each other
   2. They will attract each other
   3. Nothing will happen
   4. They will demagnetize each other
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   Answer: B. They will attract each other

   Unlike magnetic poles (North and South) attract each other. Like poles (North-North or South-South) repel each other.

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