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Ninth Grade (Grade 9) Magnetism and Electricity Questions

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Grade 9 Magnetism and Electricity
The buildup of electrical charges on an object is called                     .
  1. static electricity
  2. electric electricity
  3. current electricity
Grade 9 Magnetism and Electricity
Telephones use electromagnets to change                                 .
  1. electric currents to light waves
  2. electric currents to sound waves
  3. magnetism to light waves
  4. magnetism to sound waves
Grade 9 Magnetism and Electricity
What is the area around a magnet in which it can exert a force called?
  1. magnetic domain
  2. magnetic area
  3. magnetic source
  4. magnetic field
Grade 9 Magnetism and Electricity
The total amount of energy delivered every second to a resistor is a measure of
  1. Volts.
  2. Power.
  3. Current.
  4. Resistance.
Grade 9 Magnetism and Electricity
You accidentally drop a permanent magnet on the floor during science lab. Which of the following would be most likely occur?
  1. The magnetism may weaken.
  2. The magnetism may strengthen.
  3. The magnet may reverse its poles.
Grade 9 Magnetism and Electricity
An electric generator produces 10 megawatts. The amount is equivalent to
  1. 10,000 watts.
  2. 1,000,000 watts.
  3. 10,000,000 watts.
  4. 0.010 watt.
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
Telephones use electromagnets to change magnetism to sound waves.
  1. True
  2. False
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
Opposite electrical charges when in contact with each other                .
  1. repel
  2. attract
  3. do not interact
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