McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 251. |
The power transmitted through the pipe is maximum when the head lost due to friction is equal to |
| A. | One-fourth of the total supply head |
| B. | One-third of the total supply head |
| C. | One-half of the total supply head |
| D. | Two-third of the total supply head |
| Answer» B. One-third of the total supply head | |
| 252. |
Falling drops of water become spheres due to the property of |
| A. | Adhesion |
| B. | Cohesion |
| C. | Surface tension |
| D. | Viscosity |
| Answer» C. Surface tension | |
| 253. |
The difference of pressure between the inside and outside of a liquid drop is |
| A. | p = T × r |
| B. | p = T/r |
| C. | p = T/2r |
| D. | p = 2T/r |
| Answer» D. p = 2T/r | |
| 254. |
A venturi -flume is used to measure |
| A. | Pressure of liquid |
| B. | Discharge of liquid |
| C. | Pressure difference between two points in a channel |
| D. | Pressure difference between two points in a pipe |
| Answer» B. Discharge of liquid | |
| 255. |
Working principle of dead weight pressure gauge tester is based on |
| A. | Pascal's law |
| B. | Dalton's law of partial pressure |
| C. | Newton's law of viscosity |
| D. | Avogadro's hypothesis |
| Answer» A. Pascal's law | |
| 256. |
The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is |
| A. | 4.1 s |
| B. | 5.2 s |
| C. | 10.4 s |
| D. | 14.1 s |
| Answer» C. 10.4 s | |
| 257. |
The discharge through a channel of rectangular section will be maximum, if |
| A. | Its depth is twice the breadth |
| B. | Its breadth is twice the depth |
| C. | Its depth is thrice the breadth |
| D. | Its breadth is thrice the depth |
| Answer» B. Its breadth is twice the depth | |
| 258. |
The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel. |
| A. | 0.34 times |
| B. | 0.67 times |
| C. | 0.81 times |
| D. | 0.95 times |
| Answer» D. 0.95 times | |
| 259. |
Uniform flow occurs when |
| A. | The flow is steady |
| B. | The flow is streamline |
| C. | Size and shape of the cross section in a particular length remain constant |
| D. | Size and cross section change uniformly along length |
| Answer» C. Size and shape of the cross section in a particular length remain constant | |
| 260. |
Bulk modulus of a fluid is the ratio of |
| A. | Shear stress to shear strain |
| B. | Increase in volume to the viscosity of fluid |
| C. | Increase in pressure to the volumetric strain |
| D. | Critical velocity to the viscosity of fluid |
| Answer» C. Increase in pressure to the volumetric strain | |
| 261. |
An average value of coefficient of velocity is |
| A. | 0.62 |
| B. | 0.76 |
| C. | 0.84 |
| D. | 0.97 |
| Answer» D. 0.97 | |
| 262. |
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are |
| A. | Less |
| B. | More |
| C. | Equal |
| D. | Less at low temperature and more at high temperature |
| Answer» B. More | |
| 263. |
When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure |
| A. | Varies as the square of the radial distance |
| B. | Increases linearly as its radial distance |
| C. | Increases as the square of the radial distance |
| D. | Decreases as the square of the radial distance |
| Answer» A. Varies as the square of the radial distance | |
| 264. |
Which of the following is the unit of kinematic viscosity? |
| A. | Pascal |
| B. | Poise |
| C. | Stoke |
| D. | Faraday |
| Answer» C. Stoke | |
| 265. |
Reynold's number is the ratio of the inertia force to the |
| A. | Surface tension force |
| B. | Viscous force |
| C. | Gravity force |
| D. | Elastic force |
| Answer» B. Viscous force | |
| 266. |
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is |
| A. | 1 |
| B. | 5 |
| C. | 7 |
| D. | 6 |
| Answer» D. 6 | |
| 267. |
A differential manometer is used to measure |
| A. | Atmospheric pressure |
| B. | Pressure in pipes and channels |
| C. | Pressure in Venturimeter |
| D. | Difference of pressures between two points in a pipe |
| Answer» D. Difference of pressures between two points in a pipe | |
| 268. |
In a venturi-flume, the flow takes place at |
| A. | Atmospheric pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | None of these |
| Answer» A. Atmospheric pressure | |
| 269. |
The normal stress is same in all directions at a point in a fluid |
| A. | Only when the fluid is frictionless |
| B. | Only when the fluid is incompressible and has zero viscosity |
| C. | When there is no motion of one fluid layer relative to an adjacent layer |
| D. | Irrespective of the motion of one fluid layer relative to an adjacent layer |
| Answer» C. When there is no motion of one fluid layer relative to an adjacent layer | |
| 270. |
The highest efficiency is obtained with a channel of __________ section. |
| A. | Circular |
| B. | Square |
| C. | Rectangular |
| D. | Trapezoidal |
| Answer» D. Trapezoidal | |
| 271. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid) |
| A. | wH |
| B. | wH/2 |
| C. | wH2/2 |
| D. | wH2/3 |
| Answer» C. wH2/2 | |
| 272. |
Which of the following manometer has highest sensitivity? |
| A. | U-tube with water |
| B. | Inclined U-tube |
| C. | U-tube with mercury |
| D. | Micro-manometer with water |
| Answer» D. Micro-manometer with water | |
| 273. |
The velocity corresponding to Reynold number of 2800, is called |
| A. | Sub-sonic velocity |
| B. | Super-sonic velocity |
| C. | Lower critical velocity |
| D. | Higher critical velocity |
| Answer» D. Higher critical velocity | |
| 274. |
For a floating body to be in equilibrium |
| A. | Meta centre should be above e.g. |
| B. | Centre of buoyancy and e.g. must lie on same vertical plane |
| C. | A righting couple should be formed |
| D. | All of the above |
| Answer» D. All of the above | |
| 275. |
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece) |
| A. | 0.5 a. gH |
| B. | 0.707 a. gH |
| C. | 0.855 a. gH |
| D. | a. gH |
| Answer» A. 0.5 a. gH | |
| 276. |
A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is |
| A. | 3.53 kN |
| B. | 33.3 kN |
| C. | 35.3 kN |
| D. | None of these |
| Answer» C. 35.3 kN | |
| 277. |
The force per unit length is the unit of |
| A. | Surface tension |
| B. | Compressibility |
| C. | Capillarity |
| D. | Viscosity |
| Answer» A. Surface tension | |
| 278. |
When the Mach number is more than 6, the flow is called |
| A. | Sub-sonic flow |
| B. | Sonic flow |
| C. | Super -sonic flow |
| D. | Hyper-sonic flow |
| Answer» D. Hyper-sonic flow | |
| 279. |
The upper surface of a weir over which water flows is known is |
| A. | Crest |
| B. | Nappy |
| C. | Sill |
| D. | Weir top |
| Answer» C. Sill | |
| 280. |
One cubic metre of water weighs |
| A. | 100 litres |
| B. | 250 litres |
| C. | 500 litres |
| D. | 1000 litres |
| Answer» D. 1000 litres | |
| 281. |
Kinematic viscosity is dependent upon |
| A. | Pressure |
| B. | Distance |
| C. | Density |
| D. | Flow |
| Answer» C. Density | |
| 282. |
The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge) |
| A. | Q = (2/3) Cd × b × (2g) × (H2 - H1) |
| B. | Q = (2/3) Cd × b × (2g) × (H2 1/2- H1 1/2) |
| C. | Q = (2/3) Cd × b × (2g) × (H2 3/2 - H1 3/2) |
| D. | Q = (2/3) Cd × b × (2g) × (H2 2 - H1 2) |
| Answer» C. Q = (2/3) Cd × b × (2g) × (H2 3/2 - H1 3/2) | |
| 283. |
An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch. |
| A. | 1 % |
| B. | 1.5 % |
| C. | 2 % |
| D. | 2.5 % |
| Answer» D. 2.5 % | |
| 284. |
The Euler's equation for the motion of liquids is based upon the assumption that |
| A. | The fluid is non - viscous, homogeneous and incompressible |
| B. | The velocity of flow is uniform over the section |
| C. | The flow is continuous, steady and along the stream line |
| D. | All of the above |
| Answer» D. All of the above | |
| 285. |
The ratio of the inertia force to the viscous force is called |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Weber's number |
| D. | Euler's number |
| Answer» A. Reynold's number | |
| 286. |
The total energy of a liquid particle in motion is equal to |
| A. | Pressure energy + kinetic energy + potential energy |
| B. | Pressure energy - (kinetic energy + potential energy) |
| C. | Potential energy - (pressure energy + kinetic energy |
| D. | Kinetic energy - (pressure energy + potential energy) |
| Answer» A. Pressure energy + kinetic energy + potential energy | |
| 287. |
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Hot wire anemometer |
| D. | Pitot tube |
| Answer» D. Pitot tube | |
| 288. |
The force present in a moving liquid is |
| A. | Inertia force |
| B. | Viscous force |
| C. | Gravity force |
| D. | All of these |
| Answer» D. All of these | |
| 289. |
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water? |
| A. | 10 m/sec |
| B. | 25 m/sec |
| C. | 2 m/sec |
| D. | 50 m/sec |
| Answer» C. 2 m/sec | |
| 290. |
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» B. Uniform flow | |
| 291. |
The coefficient of discharge for an external mouthpiece depends upon |
| A. | Velocity of liquid |
| B. | Pressure of liquid |
| C. | Area of mouthpiece |
| D. | Length of mouthpiece |
| Answer» D. Length of mouthpiece | |
| 292. |
The specific weight of water is 1000 kg/m3 |
| A. | At normal pressure of 760 mm |
| B. | At 4°C temperature |
| C. | At mean sea level |
| D. | All the above |
| Answer» D. All the above | |
| 293. |
If the depth of water in an open channel is greater than the critical depth, the flow is called |
| A. | Critical flow |
| B. | Turbulent flow |
| C. | Tranquil flow |
| D. | Torrential flow |
| Answer» C. Tranquil flow | |
| 294. |
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as |
| A. | Steady flow |
| B. | Turbulent flow |
| C. | Vortex flow |
| D. | Uniform flow |
| Answer» C. Vortex flow | |
| 295. |
The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 296. |
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be |
| A. | 500 kg |
| B. | 1000 kg |
| C. | 1500 kg |
| D. | 2000 kg |
| Answer» D. 2000 kg | |
| 297. |
The velocity at which the laminar flow stops, is known as |
| A. | Velocity of approach |
| B. | Lower critical velocity |
| C. | Higher critical velocity |
| D. | None of these |
| Answer» B. Lower critical velocity | |
| 298. |
The line of action of the buoyant force acts through the |
| A. | Centroid of the volume of fluid vertically above the body |
| B. | Centre of the volume of floating body |
| C. | Center of gravity of any submerged body |
| D. | Centroid of the displaced volume of fluid |
| Answer» D. Centroid of the displaced volume of fluid | |
| 299. |
The buoyancy depends upon the |
| A. | Weight of the liquid displaced |
| B. | Pressure with which the liquid is displaced |
| C. | Viscosity of the liquid |
| D. | Compressibility of the liquid |
| Answer» A. Weight of the liquid displaced | |
| 300. |
Two dimensional flows occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive 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 patterns are identical in each plane |
| Answer» D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane | |
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