Question

Assertion (A): The accuracy of a measuring device increases with the decrease in its least count.
Reason (R): The least count is the smallest length that can be measured using a measuring device.

• A. A and R are true and R is the correct explanation of A.
• B. A and R are true, but R is not the correct explanation of A.
• C. A is true but R is false.
• D. Both A and R are false.

Answer 1

The correct option is A

A and R are true and R is the correct explanation of A.

The explanation for the correct assertion statement

1. The accuracy of a measuring device is directly proportional to the least count of the measuring device.
2. If the least count is small then accuracy will be more.

The explanation for the correct reason statement

The least count of a device is defined as the smallest length that can be measured by using that device.

Hence the correct option is (A) A and R are true and R is the correct explanation of A.