One complete set of negative and positive values of alternating quantities is called
A) Time period
B) Amplitude
C) Frequency
D) Cycle

Hint: In this question, definition of a term is given in which both the integral values, i.e., positive and negative are included in the definition of an alternating quantity. One by one terms from the option can be interpreted and try to match with the one given in the question’s definition.

Complete step by step answer:
Now, let’s know a bit about all the other terms given in the question,
1. Time period: It is defined as the time taken by an alternating quantity to complete one cycle. Its SI unit is second (s).
2. Amplitude: It is the maximum value, attained by an alternating quantity during positive or negative half cycle. It is also known as Peak value or maximum value.
3. Frequency: It is the number of cycles per second of an alternating quantity. Its unit is hertz (Hz). It is the reciprocal of time period.
4. Cycle: One complete set of negative and positive values of alternating quantities is known as cycle.
Hence, we can conclude that the one complete set of negative and positive values of alternating quantities is called a cycle.

So, the correct answer is “Option D”.

Additional Information:
The cycle repeats itself in a uniform pattern and contains one complete set of negative and positive values of alternating quantities.

Note:
Here, we need to make sure the difference between the two terms that are amplitude and cycle. The amplitude is the maximum value, attained by an alternating quantity during positive or negative half cycle. Whereas, the cycle is one complete set of positive and negative values of an alternating quantity.