MCQOPTIONS
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MCQOPTIONS
This section includes 270 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The units of dynamic or absolute viscosity are? |
| A. | metres² per sec |
| B. | kg sec/meter |
| C. | newton-sec per meter |
| D. | newton-sec² per meter |
| Answer» D. newton-sec¬¨‚⧠per meter | |
| 202. |
Two pipe systems can be said to be equivalent, when the following quantites are same? |
| A. | friction loss and flow |
| B. | length and diameter |
| C. | flow and length |
| D. | friction factor and diameter |
| Answer» B. length and diameter | |
| 203. |
When an ideal fluid flows past a sphere? |
| A. | highest intensity of pressure occurs around the circumference at right angles to flow |
| B. | lowest pressure intensity occurs at front stagnation point |
| C. | lowest pressure intensity occurs at rear stagnation point |
| D. | total drag is zero |
| Answer» E. | |
| 204. |
A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be? |
| A. | 1 m |
| B. | 10m |
| C. | 100m |
| D. | none of the above |
| Answer» D. none of the above | |
| 205. |
A body floats in stable equilibrium? |
| A. | when its meatcentric height is zero |
| B. | when the metancentre is above e.g. |
| C. | when its e.g. is below it’s center of buoyancy |
| D. | metacentre has nothing to do with position of e.g. for determining stability |
| Answer» C. when its e.g. is below it‚Äö√Ñ√¥s center of buoyancy | |
| 206. |
The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as? |
| A. | one dimensional flow |
| B. | uniform flow |
| C. | steady flow |
| D. | turbulent flow |
| Answer» E. | |
| 207. |
Dynamic viscosity of most of the gases with rise in temperature? |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | unpredictable |
| Answer» B. decreases | |
| 208. |
The center of pressure of a surface subjected to fluid pressure is the point? |
| A. | on the surface at which resultant pres-sure acts |
| B. | on the surface at which gravitational force acis |
| C. | at which all hydraulic forces meet |
| D. | similar to metacentre |
| Answer» B. on the surface at which gravitational force acis | |
| 209. |
An ideal flow of any fluid must satisfy? |
| A. | Pascal law |
| B. | Newton’s law of viscosity |
| C. | boundary layer theory |
| D. | continuity equation |
| Answer» E. | |
| 210. |
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be? |
| A. | 2 meters of water column |
| B. | 3 meters of water column |
| C. | 3.5 meters of water column |
| D. | 4 m of water column |
| Answer» C. 3.5 meters of water column | |
| 211. |
A fluid in equilibrium can’t sustain? |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | bending stress |
| Answer» D. bending stress | |
| 212. |
Mach number is significant in? |
| A. | supersonics, as with projectiles and jet propulsion |
| B. | full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc |
| C. | simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls |
| D. | all of fhe above |
| Answer» B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc | |
| 213. |
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately? |
| A. | 5 mm |
| B. | 10 mm |
| C. | 20 mm |
| D. | 30 mm |
| Answer» E. | |
| 214. |
Stream lines and path lines always coincide in case of? |
| A. | steady flow |
| B. | laminar flow |
| C. | uniform flow |
| D. | turbulent flow |
| Answer» B. laminar flow | |
| 215. |
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 |
| Answer» C. a trial solution is not necessary | |
| 216. |
The flow in which conditions do not change with time at any point, is known as? |
| A. | one dimensional flow |
| B. | uniform flow |
| C. | steady flow |
| D. | turbulent flow |
| Answer» D. turbulent flow | |
| 217. |
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is? |
| A. | zero |
| B. | one-fourth its value when cylinder was full |
| C. | one-half its value when cylinder was full |
| D. | cannot be predicted from the given data |
| Answer» B. one-fourth its value when cylinder was full | |
| 218. |
Pascal-second is the unit of? |
| A. | pressure |
| B. | kinematic viscosity |
| C. | dynamic viscosity |
| D. | surface tension |
| Answer» D. surface tension | |
| 219. |
Centre of pressure compared to e.g. is? |
| A. | above it |
| B. | below it |
| C. | at same point |
| D. | above or below depending on area of body |
| Answer» C. at same point | |
| 220. |
Flow occurring in a pipeline when a valve is being opened is? |
| A. | steady |
| B. | unsteady |
| C. | laminar |
| D. | vortex |
| Answer» C. laminar | |
| 221. |
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?? |
| A. | 0.5 |
| B. | 0.4 |
| C. | 0.515 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 222. |
The value of mass density in kgsecVm4 for water at 0°C is? |
| A. | 1 |
| B. | 1000 |
| C. | 100 |
| D. | 101.9 |
| Answer» E. | |
| 223. |
If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is? |
| A. | 1 |
| B. | 4/3 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 224. |
For pipes, laminar flow occurs when Roynolds number is? |
| A. | less than 2000 |
| B. | between 2000 and 4000 |
| C. | more than 4000 |
| D. | less than 4000 |
| Answer» B. between 2000 and 4000 | |
| 225. |
General energy equation holds for? |
| A. | steady flow |
| B. | turbulent flow |
| C. | laminar flow |
| D. | non-uniform flow |
| Answer» E. | |
| 226. |
Kinematic viscosity is equal to? |
| A. | dynamic viscosity/density |
| B. | dynamicviscosity x density |
| C. | density/dynamic viscosity |
| D. | 1/dynamicviscosity x density |
| Answer» B. dynamicviscosity x density | |
| 227. |
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be |
| A. | 300 |
| B. | 337.5 |
| C. | 600 |
| D. | 675 |
| Answer» E. | |
| 228. |
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is$ |
| A. | directly proportional to Reynolds number and independent of pipe wall roughness |
| B. | directly proportional to pipe wall roughness and independent of Reynolds number |
| C. | inversely proportional to Reynolds number and indpendent of pipe wall roughness |
| D. | inversely proportional to Reynolds number and directly proportional to pipe wall roughness |
| Answer» D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness | |
| 229. |
Which of the following is used to measure the discharge ? |
| A. | current meter |
| B. | venturimeter |
| C. | pitot tube |
| D. | hotwire anemometer |
| Answer» C. pitot tube | |
| 230. |
Surge wave in a rectangular channel is an example ofi) steady flowii) unsteady flowiii) uniform flowiv) non-uniform flowThe correct answer is |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» E. | |
| 231. |
For laminar flow in circular pipes, the Darcy’s friction factor f is equal to$ |
| A. | 16/Re |
| B. | 32/ Re |
| C. | 64/ Re |
| D. | none of the above where Re is Reynolds number. |
| Answer» D. none of the above where Re is Reynolds number. | |
| 232. |
Drag force is a function ofi) projected area of the bodyii) mass density of the fluidiii) velocity of the bodyThe correct answer is |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 233. |
If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will |
| A. | rise until its weight equals the buoyant force |
| B. | tend to move downward and it may finally sink |
| C. | float |
| D. | none of the above |
| Answer» C. float | |
| 234. |
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to |
| A. | the weight of the body |
| B. | more than the weight of the body |
| C. | less than the weight of the body |
| D. | weight of the fluid displaced by the body |
| Answer» E. | |
| 235. |
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is$ |
| A. | 10m/sec² |
| B. | 9.81 m/sec² |
| C. | 10.2/m sec |
| D. | 9.75 m/sec² |
| Answer» B. 9.81 m/sec¬¨‚⧠| |
| 236. |
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be |
| A. | minimum |
| B. | maximum |
| C. | negative value |
| D. | could be any value |
| Answer» E. | |
| 237. |
In which of the following the friction drag is generally larger than pressure drag? |
| A. | a circular disc or plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | an airfoil |
| Answer» E. | |
| 238. |
The discharge through a V- notch varies as |
| A. | H1/2 |
| B. | H3’2 |
| C. | H5/2 |
| D. | H5’4 where H is head. |
| Answer» D. H5‚Äö√Ñ√¥4 where H is head. | |
| 239. |
The peoperty by virtue of which a liquid opposes relative motion between its different layers is called |
| A. | surface tension |
| B. | co-efficient of viscosity |
| C. | viscosity |
| D. | osmosis |
| Answer» D. osmosis | |
| 240. |
When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies |
| A. | linearly with radial distance |
| B. | as the square of the radial distance |
| C. | inversely as the square of the radial distance |
| D. | inversely as the radial distance |
| Answer» C. inversely as the square of the radial distance | |
| 241. |
Two dimensional flow occurs when |
| A. | the direction and magnitude of the velocity at all points are identical |
| B. | the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time |
| C. | the magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane |
| Answer» E. | |
| 242. |
Equation of continuity is based on the principle of conservation of |
| A. | mass |
| B. | energy |
| C. | momentum |
| D. | none of the above |
| Answer» B. energy | |
| 243. |
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)$ |
| A. | 0.423 D |
| B. | 0.577 D |
| C. | 0.223 D |
| D. | 0.707 D |
| Answer» C. 0.223 D | |
| 244. |
The velocity distribution for laminar flow through a circular tube |
| A. | is constant over the cross-section |
| B. | varies linearly from zero at walls to maximum at centre |
| C. | varies parabolically with maximum at the centre |
| D. | none of the above |
| Answer» D. none of the above | |
| 245. |
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is |
| A. | constant |
| B. | dependent only on Reynolds number |
| C. | a function of Reynolds number and relative roughness |
| D. | dependent on relative roughness only |
| Answer» C. a function of Reynolds number and relative roughness | |
| 246. |
Euler’s dimensionless number relates the following# |
| A. | inertial force and gravity |
| B. | viscous force and inertial force |
| C. | viscous force and buoyancy force |
| D. | pressure force and inertial force |
| Answer» E. | |
| 247. |
A floating body is said to be in a state of stable equilibrium |
| A. | when its metacentric height is zero |
| B. | when the metacentre is above the centre of gravity |
| C. | when the metacentre is below the centre of gravity |
| D. | only when its centre of gravity is below its centre of buoyancy |
| Answer» C. when the metacentre is below the centre of gravity | |
| 248. |
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 |
| Answer» D. none of the above | |
| 249. |
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be# |
| A. | 2 meters of water column |
| B. | 3 meters of water column |
| C. | 5 meters of water column |
| D. | 6 meters of water Column |
| Answer» E. | |
| 250. |
Reynolds number is significant in |
| A. | supersonics, as with projectile and jet propulsion |
| B. | full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc |
| C. | simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls |
| D. | all of the above |
| Answer» C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship‚Äö√Ñ√¥s hulls | |