physics quiz

What is the primary carrier of electric current in a copper wire?

• A. Protons
  

• B. Neutrons
  

• C. Electrons

• D. Ions

What is the unit used to measure electric current?

• A. Volt (V)
  

• B. Ohm (Ω)
  

• C. Ampere (A)
  

• D. Joule (J)

What is the main difference between direct current (DC) and alternating current (AC)?

• A. DC flows in a loop, and AC does not.
  

• B. DC flows in one direction, while AC changes direction periodically.
  

• C. AC is used in batteries, while DC powers homes.
  

• D. AC involves electron flow, while DC does not.

What is the effect of increasing resistance in a circuit on the current flow?

• A. Current increases
  

• B. Current decreases
  

• D. Current fluctuates

• C. Current remains the same

In a circuit, what causes electrons to move and create a current?

• A. The resistance of the circuit

• B. The voltage provided by the power source
  

• C. The capacitance of the circuit
  

• D. The length of the wire

Which of the following devices typically uses alternating current (AC)?

• A. A smartphone
  

• B. A laptop battery
  

• C. A refrigerator
  

• D. A flashlight

Which of the following is a common use of direct current (DC)?

• D. Lighting street lamps

• B. Charging batteries
  

• C. Running electric motors
  

• A. Powering household appliances
  

Which of the following best describes the term 'voltage'?

• C. The opposition to current flow
  

• B. The potential difference between two points in a circuit
  

• D. The energy consumed by a device

• A. The rate of flow of electric charge
  

What property of a material affects how easily electrons can flow through it?

• A. Voltage
  

• B. Resistance
  

• C. Capacitance
  

• D. Power

Which of the following describes the term 'circuit'?

• A. A closed loop that allows current to flow
  

• B. A device that stores electrical energy
  

• C. A measure of electrical power
  

• D. A type of electrical resistance