V (Volts) 12V 30 18 42 t (ms) -12V
The waveform is shown below:
(i) Peak value is the value of the maximum displacement of the wave from the peak position, from the given waveform we can observe that the maximum displacement from the origin is 12 V. Hence the peak value is a Peak value.
(ii) The peak-to-peak voltage is the displacement of the wave from the maximum peak value to the minimum peak value, on clearly observing the waveform we can easily find out that the peak-to-peak voltage is 24 Volts.
(iii)
The time period of a waveform is the time taken by the waveform to complete one revolution, i.e. the basic waveform which is repeating has the period equal to the time period. 
From the above waveform, we can say that the time period is 24 milliseconds.
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