Discussion
The most suitable instrument for the measurement of voltage is
Answer: C
The key takes the CRO as the most suitable instrument for measuring voltage (option C). It shows the actual waveform, so it measures the peak, peak-to-peak and instantaneous values of any waveform, including non-sinusoidal and fast signals, and it has a high input impedance.
An analog voltmeter (B) and a DMM (D) are calibrated for steady or sinusoidal values and respond slowly to a changing signal, and a DVM (A) gives a number without showing the waveform. The question has no stated condition, so the answer rests on the key.
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