Question:
Which of the following is not a unit of distance?
Which of the following is not a unit of distance?
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Three of the options are units of length. One of them is actually a measuring device, not a unit at all.
Updated On: Jul 16, 2026
- Ammeter
- Cubit
- Parsec
- Angstrom
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The Correct Option is A
Solution and Explanation
Step 1: Look at each word and ask what physical quantity it measures.
Step 2: An ammeter is a device used to measure electric current in amperes. It does not measure length at all.
Step 3: A cubit is an old unit of length based on the forearm, a parsec is a large astronomical unit of distance used for stars and galaxies, and an angstrom is a very small unit of length equal to \(10^{-10}\) m, used for atomic and molecular sizes.
Since cubit, parsec and angstrom all measure distance, and ammeter measures current, the odd one out is the ammeter. The correct answer is option A.
Step 2: An ammeter is a device used to measure electric current in amperes. It does not measure length at all.
Step 3: A cubit is an old unit of length based on the forearm, a parsec is a large astronomical unit of distance used for stars and galaxies, and an angstrom is a very small unit of length equal to \(10^{-10}\) m, used for atomic and molecular sizes.
Since cubit, parsec and angstrom all measure distance, and ammeter measures current, the odd one out is the ammeter. The correct answer is option A.
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