Which of the following is the smallest unit of length among the given options?

Options

  • A. Metre
  • B. Centimetre
  • C. Angstrom
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

C. Angstrom

Detailed Explanation

Angstrom is the smallest among the listed units. One angstrom equals 10⁻¹⁰ metre, whereas one centimetre equals 10⁻² metre. Small units such as nanometre, angstrom and picometre are commonly used for microscopic and atomic measurements. In competitive examinations, carefully compare the powers of ten before selecting the answer.