Action and Use of Circuit Components

Action and Use of Circuit Components Quiz

Spec 4.3.3 · Cambridge IGCSE Physics: Quiz

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5 questions, one answer each

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  1. 1. How does the resistance of an NTC thermistor change as temperature increases?

    • A. It increases
    • B. It decreases
    • C. It stays constant
    • D. It becomes zero

  2. 2. What is the main purpose of a potential divider circuit?

    • A. To measure current
    • B. To produce a variable output voltage from a fixed supply
    • C. To store electrical energy
    • D. To convert a.c. to d.c.

  3. 3. In a potential divider with R1/R2 = 2, what is V1/V2?

    • A. 0.5
    • B. 1
    • C. 2
    • D. 4

  4. 4. How does a relay allow a small control current to operate a large appliance safely?

    • A. By directly connecting the control circuit to the appliance
    • B. By using an electromagnet to operate a switch that controls the larger current
    • C. By reducing the appliance's resistance
    • D. By converting the current to light

  5. 5. How does a loudspeaker produce sound from an electrical signal?

    • A. By heating a filament until it glows
    • B. By passing a varying current through a coil in a magnetic field, causing vibration
    • C. By using a thermistor to sense temperature changes
    • D. By splitting the current using a potential divider

Quiz