Question

Which of the following clocks is most accurate?

• A. Simple pendulum
• B. Stop watch
• C. Caesium clock
• D. Hourglass

Answer 1

Answer: (C)

Caesium clocks are the most accurate commercially produced time and frequency standards, and serve as the primary standard for the definition of the second in SI system.

Hence, Caesium clock is most accurate clock

Option C is correct.