Quiz  /  Ohms Law Class 9 MCQ Questions With Answers

  • 1. 
    Which two areas of physical science are closely related to the development of electric motors and generators?

  • sound and light
  • electricity and sound
  • light and magnetism
  • electricity and magnetism

  • 2. 
    What unit is used to measure the voltage?

  • Ohms
  • Omega
  • Volts
  • Amps

  • 3. 
    An IPod uses a standard 1.5 V battery. How much resistance is in the circuit if it uses a current of 0.01A?

  • 50Ω
  • 100Ω
  • 150Ω
  • 200Ω

  • 4. 
    An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.

  • 60Ω
  • 120Ω
  • 180Ω
  • 240Ω

  • 5. 
    As the resistance in a circuit increases, the electric current __________.

  • increases
  • decreases
  • stays the same

  • 6. 
    The strongest part of a magnet is...

  • the bars.
  • the force field.
  • the poles.
  • the middle.

  • 7. 
    Speakers need a household voltage of 110 V to push a current of 5.5 A through them. What is theresistance of the speakers?

  • 10Ω
  • 20Ω
  • 30Ω
  • 40Ω

  • 8. 
    A 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much currentis passing through the circuit?

  • 1A
  • 1.2A
  • 1.4A
  • 1.6A

  • 9. 
    This contains a piece of metal that melts if it gets too hot in order to open a circuit.

  • conductor
  • insulator
  • fuse
  • circuit breaker

  • 10. 
    Laser printers work with the use of heat and positive and negative charges. The laser etches a negative charge on spots of the printer drum in the form of text or images. The plastic ink dust is attracted to the places on the drum with this negative charge. What is the charge of the plastic ink dots themselves?

  • electron
  • negative
  • neutral
  • positive

  • 11. 
    What unit is used to measure resistance?

  • Ohms
  • Omega
  • Volts
  • Amps

  • 12. 
    Alexandra was preparing to go on a hike in the woods. She gathered the equipment she would need and placed it on the kitchen counter. By chance, she placed her compass near an electrical outlet. Although the compass was not moving, the compass needle turned because ______.

  • the electric current in the outlet produced a magnetic field
  • the compass could only be used outdoors
  • the kitchen counter was made of a magnetic substance
  • the kitchen had a microwave oven

  • 13. 
    Which of the following will decrease the strength of the magnetic field around a wire?

  • increasing the current flowing through the wire
  • using less loops around the iron core
  • flipping the direction of the current flowing through the wire
  • using a larger iron core

  • 14. 
    A circuit contains a 1.5 volt battery and a bulb with a resistance of 3 ohms. Calculate the current.

  • 0.5A
  • 1A
  • 1.5A
  • 2A

  • 15. 
    How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms ofresistance?

  • 10V
  • 50V
  • 100V
  • 150V

  • 16. 
    Electric charges always flow from _____ areas to _____ areas.

  • positive; negative
  • negative; positive
  • neutral; negative
  • neutral; positive

  • 17. 
    Silver has a resistance of 0.0198 ohms. What voltage would produce a current of 100 amps?

  • 1.98 V
  • 0.000198 V
  • 5050 V
  • 100.0198 V

  • 18. 
    What is resistance measured in?

  • Ω (Ohms)
  • V (Volts)
  • A (Amps)
  • W (Watts)

  • 19. 
    Magnets have a north and a south ___________

  • shape
  • color
  • pole
  • region

  • 20. 
    This exerts a force that causes other electric charges to move.

  • electrical poles
  • electrical fields
  • insulators
  • conductors

  • 21. 
    In a closed circuit containing one resistor and a battery, if the voltage in the battery increases, the current going through the resistor increases. Why does this occur?

  • As the electrons are sped up, they bunch closer together.
  • As the electrons have more energy, they vibrate more rapidly.
  • As the electrons are pushed more by the battery, they move faster through the circuit.
  • As the distance around the circuit increases, the electrons take longer to travel around.

  • 22. 
    The force or push that causes electric charges to move is called ______ .

  • resistance
  • voltage difference
  • static electricity
  • current

  • 23. 
    Which circuit below contains the greatest voltage?

  • A circuit with a current of 20 amps and a resistance of 16 ohms
  • A circuit with a current of 10 amps and a resistance of 10 ohms
  • A circuit with a current of 25 amps and a resistance of 16 ohms
  • A circuit with a current of 20 amps and a resistance of 10 ohms

  • 24. 
    What is the current produced by a 9-volt battery flowing through a resistance of 0.2 ohms?

  • 1.8 amps
  • 45 amps
  • 0.022 amps
  • 8.8 amps

  • 25. 
    Calculate the current an electric clothes dryer draws when it is connected to a 230 V source and has a resistanceof 9.2 Ω.

  • 5A
  • 15A
  • 25A
  • 35A
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