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Ninth Grade (Grade 9) Magnetism and Electricity Questions

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Grade 9 Magnetism and Electricity
When you are at home, turning off a light usually does not turn off your T.V. This is because
  1. most electrical devices in a house are on parallel circuits
  2. most electrical devices in a house are on series circuits
  3. they have different sources of voltage
  4. a T.V. does not require electricity
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
You accidentally drop a permanent magnet on the floor during science lab. Which of the following would most likely occur?
  1. The magnetism may weaken.
  2. The magnetism may strengthen.
  3. The magnet may reverse its poles.
  4. The magnet would remain unchanged.
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
Complete the following statement:

If you increase the resistance in a series circuit,                               .
  1. the current will also increase
  2. the current will decrease
  3. the voltage will increase
  4. the voltage will decrease
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
Which of the following is a source of direct current?
  1. wall outlet
  2. battery
  3. bar magnet
  4. None of the above
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
The area around a magnet in which it can exert a force is called:
  1. magnetic domain
  2. magnetic area
  3. magnetic source
  4. magnetic field
Grade 9 Magnetism and Electricity
Brooke was watching T.V., charging her iPod, heating up her curling iron, and blow-drying her hair. When she plugged in her super-deluxe Austin Mahone singing make-up mirror with extra bright halogen bulbs the power went out and she caught a faint scent of burning rubber. What best explains what happened?
  1. Each device she added to the series circuit increased the total resistance. The voltage had to increase to provide current until it became so high it had to shut down.
  2. Every device she plugged in acted as a new resistor on a parallel circuit. This increased the resistance to the point that there was not enough voltage to power all the devices.
  3. Every device she plugged in acted as a new resistor on a parallel circuit. This would decrease the overall resistance on the parallel circuit and therefore increase the current flowing in the wires. Increasing the current generates more heat in the wire, causing a switch called a "circuit breaker" to open, stopping the flow of current in an attempt to prevent fire.
  4. Wizards obviously.
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
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