Question

Assertion: Velocity ratio of a machine has no unit.

Reason: Velocity ratio is defined as the ratio of the distance moved by the effort to the corresponding distance moved by the road. So, it being the ratio of the two similar quantities (i.e., distances), has no unit.

Options

• If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

• If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion.

• If Assertion is true, but the Reason is false.

• If Assertion is false, but the Reason is true.

Answer 1

If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

Explanation:

The velocity ratio of a machine has no unit because it is a ratio of two distances. Therefore, the Assertion (A) is true.

Velocity ratio is defined as the ratio of the distance moved by the effort to the corresponding distance moved by the load. Since both quantities are distances, their units cancel out. Therefore, the Reason (R) is true and correctly explains the Assertion.

Hence, both A and R are true and R is the correct explanation of A.