Question

Assertion (A): The accuracy of a standard screw gauge is more than the accuracy of a standard vernier caliper.

Reason (R): The least count of standard screw gauge is more than the least count of standard vernier caliper.

• 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 C

A is true but R is false.

The explanation for the correct assertion

We know,

The least count for the screw gauge = 0.01 mm

The least count for the vernier caliper = 0.1 mm

So, $L.C_{SG}<L{C}_{vc}$

Or, we can say that $Accurac{y}_{SG}>Accurac{y}_{vc}$

So the accuracy of the screw gauge is more than the accuracy of the vernier caliper.

The explanation for the incorrect reason statement

The least count for the screw gauge = 0.01 mm

The least count for the vernier caliper = 0.1 mm

So, the least count of the screw gauge is less than the least count of the vernier caliper.

Hence the correct option is (C) A is true but R is false.