Which of the following is NOT sufficient to measure the resistance of an unknown resistor?
Correct answer: D. Battery, ammeter, galvanometer, switch, connecting wires
- A. Battery, voltmeter, ammeter, connecting wires, switch
- B. Battery, galvanometer, 3 known resistors, switch, connecting wires
- C. Battery, ohmmeter, connecting wires
- D. Battery, ammeter, galvanometer, switch, connecting wires
Explanation
The correct answer is Option D. This setup does not have the necessary equipment to measure voltage or resistance directly, as it lacks both a voltmeter and an ohmmeter. An ammeter alone cannot provide the necessary data to calculate resistance without a corresponding voltage measurement.Options A and C are sufficient because they involve either a direct resistance measurement with an ohmmeter or the application of Ohm's Law using both current and voltage measurements. Option B is also sufficient as it effectively uses a Wheatstone bridge to determine the unknown resistance through balance, a known and reliable method.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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