"t" is the time required to evacuate a tank filled of liquid, time required to evacuate 50% of liquid will be

Explanation

The correct answer is 0.707 T. This is because the process of evacuating a tank often follows an exponential decay pattern, as described by Torricelli's law, where the flow rate decreases as the liquid level drops. The time to reach 50% evacuation is approximately 0.707 times the total evacuation time due to this non-linear relationship. Option A (0.5 T) assumes a linear process, which is incorrect. Option C (0.88 T) overestimates the time required, and Option D (0.4 T) underestimates it, both diverging from the typical fluid dynamics behavior.