Components in Series & Parallel Circuits Quiz
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5 questions, one answer each
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1. Why is domestic lighting wired in parallel rather than series?
- A. It uses less wire
- B. Each light can be switched independently and one failing does not affect the others
- C. It produces a brighter light
- D. It is cheaper to install
2. What shape is the I-V graph for a wire or fixed resistor at constant temperature?
- A. A curve that flattens out
- B. A straight line through the origin
- C. A sharp step function
- D. A straight line not through the origin
3. Why does the I-V graph for a filament lamp curve and flatten at higher voltage?
- A. The lamp resistance decreases as it heats up
- B. The lamp resistance increases as it heats up, reducing further current increase
- C. The lamp stops conducting at high voltage
- D. The voltage supply becomes unstable
4. How does the resistance of an LDR change as light intensity increases?
- A. It increases
- B. It decreases
- C. It stays the same
- D. It becomes infinite
5. A diode is connected in reverse bias in a circuit. What happens?
- A. A large current flows
- B. Almost no current flows
- C. The current is the same as forward bias
- D. The diode heats up and glows