# Measurements

### Explanation of question 23

- i An oscilloscope can only display a sine wave
- ii Vertical deflection of the electron beam of an oscilloscope is controlled by a voltage on the X-plates

1. i and ii are both true
2. i is true but ii is false
3. i is false but ii is true
4. i and ii are both false

The answer is :- 4 An oscilloscope can display any waveform, providing the frequency of that waveform is within the limits acceptable to the oscilloscope.

It is the voltage on the Y-plates which determines the vertical deflection.

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