Civil Engineering Archives

1661. Centre of buoyancy always_________________?

A. coincides with the centre of gravity

B. coincides with the centroid of the volume of fluid displaced

C. remains above the centre of gravity

D. remains below the centre of gravity

✅ The correct answer is option B.

1662. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is__________________?

A. 0.25

B. 0.50

C. 1.0

D. none of the above

✅ The correct answer is option C.

1663. The wake_______________?

A. always occurs before a separation point

B. always occurs after a separation point

C. is a region of high pressure intensity

D. none of the above

✅ The correct answer is option B.

1664. The speed of a pressure wave through a pipe depends upon________________?

A. the length of pipe

B. the viscosity of fluid

C. the bulk modulus for the fluid

D. the original head

✅ The correct answer is option C.

1665. The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to________________?

A. 0.1

B. 0.01

C. 0.001

D. 0.0001

✅ The correct answer is option B.

1666. If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is__________________?

A. 4/3

B. 3/2

C. 9/4

D. 27/8

✅ The correct answer is option C.

1667. In series-pipe problems_______________?

A. the head loss is same through each pipe

B. the discharge is same through each pipe

C. a trial solution is not necessary

D. the discharge through each pipe is added to obtain total discharge

✅ The correct answer is option B.

1668. The discharge through a V- notch varies as______________?

A. H1/2

B. H3’2

C. H5/2

D. H5’4 where H is head

✅ The correct answer is option C.

1669. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is________________?

A. 5kN

B. lOkN

C. 15 kN

D. 20 kN

✅ The correct answer is option B.

1670. The horizontal component of force on a curved surface is equal to the_______________?

A. product of pressure intensity at its centroid and area

B. force on a vertical projection of the curved surface

C. weight of liquid vertically above the curved surface

D. force on the horizontal projection of the curved surface

✅ The correct answer is option B.