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Which statement correctly distinguishes alternating current (AC) from direct current (DC)?
ANeither AC nor DC can change in magnitude
BBoth AC and DC reverse direction every half cycle
CAC periodically reverses its direction, while DC flows in one direction only
DAC flows in one direction only, while DC reverses periodically
Answer & Solution
Correct answer: C. AC periodically reverses its direction, while DC flows in one direction only
1. DC is a non-oscillatory current; it may rise, stay steady or fall, but always flows in one direction.
2. AC is oscillatory, rising to a maximum, falling to zero, then reversing direction in a sinusoidal pattern.
3. So AC periodically reverses direction while DC does not.
4. The option reverses the two definitions, so it is wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.68_
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