Question

Choose the correct statement(s).

• A. Accuracy and precision are independent.
• B. Precision increases with accuracy.
• C. Accuracy gives the closeness of measured value with the true value.
• D. Precision gives the closeness of measured value with the true value.

Answer 1

Answer: (A), (C)

The correct options are
A Accuracy and precision are independent.
C Accuracy gives the closeness of measured value with the true value.

Accuracy is the closeness of true value with the measured value. For example, 0.99 m is more accurate than 0.9 m when measuring a metre scale.

Precision is the closeness of measurements to each other. For example, three readings of measurements of 1.25m, 1.26 m and 1.25 m is very precise.

However, accuracy and precision are independent. Highly accurate readings may be less precise because of change in physical environment or similar reasons. Also, highly precise readings may be very inaccurate. Zero Error in measurement is a common error that leads to this.