Question

At what speed will the velocity head of stream of water be 40 cm?

(a) 2.80cms^-1

(b) 280 cms^-1

(c) 28 cms^-1

(d) 0.280 cms^-1

This question was addressed to me during an online interview.

My doubt stems from Streamline and Turbulent Flow in section Thermal Properties of Matter of Engineering Physics I

Answer 1

Right choice is (b) 280 cms^-1

The best I can explain: h=v^2/2g

v=√2gh=√(2×980×40)=280cms^-1.