Class 12 Physics · Chapter 5 · Test 1
AC Basics and RMS
42 MCQs
42 questions · 35 min · 42 marks
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Sample questions
The first 5 of 42. Try each one, then tap to see the answer.
Question 1
An alternating current is a current that varies:
- ASinusoidally with time
- BOnly in magnitude
- CLinearly with time
- DRandomly with no pattern
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Answer: A
An alternating current is a sinusoidally varying current represented by a sine or cosine function of time.
Question 2
In the equation V = V0 sin ωt the symbol ω represents the:
- APeak voltage
- BTime period
- CAngular frequency of the alternating voltage
- DPhase constant
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Answer: C
V0 is the maximum value and ω is the angular frequency of the alternating voltage.
Question 3
Every cycle of an alternating quantity consists of:
- AOne positive half-cycle only
- BTwo exactly symmetrical half cycles one positive and one negative
- CThree unequal parts
- DA constant positive value
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Answer: B
An alternating current has two symmetrical half cycles one positive and the other negative.
Question 4
In an alternating current the direction of current reverses after every:
- ACycle
- BSecond
- CMinute
- DHalf-cycle
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Answer: D
The direction of current reverses after every half-cycle and the polarity of voltage also reverses.
Question 5
The path traced by an alternating quantity plotted against time is called its:
- AWaveform
- BCycle
- CPhase
- DFrequency
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Answer: A
A waveform is the path traced by an alternating quantity as a function of time.
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