Soundness test of cement determines A. Quality of free lime B. Ultimate strength C. Durability D. Initial setting

The correct answer is: C. Durability.

Soundness test of cement determines the ability of cement to resist the effects of weathering and other environmental factors. It is a measure of the cement’s resistance to cracking and disintegration.

The other options are incorrect because:

• Option A: The quality of free lime is not determined by the soundness test.
• Option B: The ultimate strength of cement is not determined by the soundness test.
• Option D: The initial setting of cement is not determined by the soundness test.

The soundness test is an important test for cement because it helps to ensure that the cement will be durable and will not crack or disintegrate in the environment in which it is used.