McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 151. |
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 acts at a distance __________ from the liquid surface. |
| A. | H/3 |
| B. | H/2 |
| C. | 2H/3 |
| D. | 3H/4 |
| Answer» C. 2H/3 | |
| 152. |
An ideal flow of any fluid must fulfill the following |
| A. | Newton's law of motion |
| B. | Newton's law of viscosity |
| C. | Pascal' law |
| D. | Continuity equation |
| Answer» D. Continuity equation | |
| 153. |
The flow in a pipe or channel is said to be uniform when |
| A. | The liquid particles at all sections have the same velocities |
| B. | The liquid particles at different sections have different velocities |
| C. | The quantity of liquid flowing per second is constant |
| D. | Each liquid particle has a definite path |
| Answer» A. The liquid particles at all sections have the same velocities | |
| 154. |
Surface tension |
| A. | Acts in the plane of the interface normal to any line in the surface |
| B. | Is also known as capillarity |
| C. | Is a function of the curvature of the interface |
| D. | Decreases with fall in temperature |
| Answer» A. Acts in the plane of the interface normal to any line in the surface | |
| 155. |
Select the wrong statement |
| A. | An equivalent pipe is treated as an ordinary pipe for all calculations |
| B. | The length of an equivalent pipe is equal to that of a compound pipe |
| C. | The discharge through an equivalent pipe is equal to that of a compound pipe |
| D. | The diameter of an equivalent pipe is equal to that of a compound pipe |
| Answer» D. The diameter of an equivalent pipe is equal to that of a compound pipe | |
| 156. |
manometers because Alcohol is used in |
| A. | It has low vapour pressure |
| B. | It is clearly visible |
| C. | It has low surface tension |
| D. | It can provide longer column due to low density |
| Answer» D. It can provide longer column due to low density | |
| 157. |
If no resistance is encountered by displacement, such a substance is known as |
| A. | Fluid |
| B. | Water |
| C. | Gas |
| D. | Ideal fluid |
| Answer» D. Ideal fluid | |
| 158. |
The kinematic viscosity is the |
| A. | Ratio of absolute viscosity to the density of the liquid |
| B. | Ratio of density of the liquid to the absolute viscosity |
| C. | Product of absolute viscosity and density of the liquid |
| D. | Product of absolute viscosity and mass of the liquid |
| Answer» A. Ratio of absolute viscosity to the density of the liquid | |
| 159. |
The viscosity of water is __________ than that of mercury. |
| A. | Higher |
| B. | Lower |
| C. | Same as |
| D. | None of these |
| Answer» A. Higher | |
| 160. |
Surface energy per unit area of a surface is numerically equal to |
| A. | Atmospheric pressure |
| B. | Surface tension |
| C. | Force of adhesion |
| D. | Force of cohesion |
| Answer» B. Surface tension | |
| 161. |
The specific weight of sea water is __________ that of pure water. |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 162. |
Which of the following instruments is used to measure flow on the application of Bernoulli's theorem? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Nozzle |
| D. | All of the above |
| Answer» D. All of the above | |
| 163. |
The depth of the centre of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is |
| A. | 2.4 m |
| B. | 3.0 m |
| C. | 4.0 m |
| D. | 5.0 m |
| Answer» B. 3.0 m | |
| 164. |
An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice. |
| A. | Less than twice |
| B. | More than twice |
| C. | Less than three times |
| D. | More than three times |
| Answer» C. Less than three times | |
| 165. |
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» D. Continuity equation | |
| 166. |
The height of a water column equivalent to a pressure of 0.15 MPa is |
| A. | 15.3 m |
| B. | 25.3 m |
| C. | 35.3 m |
| D. | 45.3 m |
| Answer» A. 15.3 m | |
| 167. |
The region between the separation streamline and the boundary surface of the solid body is known as |
| A. | Wake |
| B. | Drag |
| C. | Lift |
| D. | Boundary layer |
| Answer» A. Wake | |
| 168. |
Froude 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 discontinuity, 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 discontinuity, gravity forces, and wave making effect, as with ship's hulls | |
| 169. |
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called |
| A. | Density of liquid |
| B. | Specific gravity of liquid |
| C. | Compressibility of liquid |
| D. | Surface tension of liquid |
| Answer» B. Specific gravity of liquid | |
| 170. |
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to |
| A. | 10 kg |
| B. | 100 kg |
| C. | 1000 kg |
| D. | 1 kg |
| Answer» A. 10 kg | |
| 171. |
The total head of a liquid particle in motion is equal to |
| A. | Pressure head + kinetic head + potential head |
| B. | Pressure head - (kinetic head + potential head) |
| C. | Potential head - (pressure head + kinetic head) |
| D. | Kinetic head - (pressure head + potential head) |
| Answer» A. Pressure head + kinetic head + potential head | |
| 172. |
Free surface of a liquid tends to contract to the smallest possible area due to force of |
| A. | Surface tension |
| B. | Viscosity |
| C. | Friction |
| D. | Cohesion |
| Answer» A. Surface tension | |
| 173. |
The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement. |
| A. | The bodies A and B have equal stability |
| B. | The body A is more stable than body B |
| C. | The body B is more stable than body A |
| D. | The bodies A and B are unstable |
| Answer» C. The body B is more stable than body A | |
| 174. |
The rise or depression of liquid in a tube due to surface tension will increase in size of tube will |
| A. | Increase |
| B. | Remain unaffected |
| C. | May increase or decrease depending on the characteristics of liquid |
| D. | Decrease |
| Answer» D. Decrease | |
| 175. |
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface) |
| A. | wA |
| B. | wx |
| C. | wAx |
| D. | wA/x |
| Answer» C. wAx | |
| 176. |
The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» B. More than | |
| 177. |
The line of action of the buoyant force acts through the Centroid of the |
| A. | Submerged body |
| B. | Volume of the floating body |
| C. | Volume of the fluid vertically above the body |
| D. | Displaced volume of the fluid |
| Answer» D. Displaced volume of the fluid | |
| 178. |
The intensity of pressure at any point, in a liquid, is |
| A. | Directly proportional to the area of the vessel containing liquid |
| B. | Directly proportional to the depth of liquid from the surface |
| C. | Directly proportional to the length of the vessel containing liquid |
| D. | Inversely proportional to the depth of liquid from the surface |
| Answer» B. Directly proportional to the depth of liquid from the surface | |
| 179. |
During the opening of a valve in a pipe line, the flow is |
| A. | Steady |
| B. | Unsteady |
| C. | Uniform |
| D. | Laminar |
| Answer» B. Unsteady | |
| 180. |
A 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» B. Pressure in pipes and channels | |
| 181. |
For hypersonic flow, the Mach number is |
| A. | Unity |
| B. | Greater than unity |
| C. | Greater than 2 |
| D. | Greater than 4 |
| Answer» D. Greater than 4 | |
| 182. |
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta) |
| A. | 2gH |
| B. | H × g) |
| C. | 2g × H |
| D. | 2gh) |
| Answer» D. 2gh) | |
| 183. |
For pipes, laminar flow occurs when Reynolds number is |
| A. | Less than 2000 |
| B. | Between 2000 and 4000 |
| C. | More than 4000 |
| D. | Less than 4000 |
| Answer» A. Less than 2000 | |
| 184. |
When the flow in an open channel is gradually varied, the flow is said to be |
| A. | Steady uniform flow |
| B. | Steady non-uniform flow |
| C. | Unsteady uniform flow |
| D. | Unsteady non-uniform flow |
| Answer» B. Steady non-uniform flow | |
| 185. |
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be |
| A. | Running full |
| B. | Running free |
| C. | Partially running full |
| D. | Partially running free |
| Answer» B. Running free | |
| 186. |
The units of kinematic viscosity are |
| A. | Metres² per sec |
| B. | kg sec/metre |
| C. | Newton-sec per metre |
| D. | Newton-sec per metre |
| Answer» A. Metres² per sec | |
| 187. |
The length of a liquid stream while flowing over a weir __________ at the ends of the sill. |
| A. | Expands |
| B. | Does not change |
| C. | Contracts |
| D. | None of these |
| Answer» C. Contracts | |
| 188. |
Newton's law of viscosity is a relationship between |
| A. | Shear stress and the rate of angular distortion |
| B. | Shear stress and viscosity |
| C. | Shear stress, velocity and viscosity |
| D. | Pressure, velocity and viscosity |
| Answer» A. Shear stress and the rate of angular distortion | |
| 189. |
The total energy line lies over the hydraulic gradient line by an amount equal to the |
| A. | Pressure head |
| B. | Velocity head |
| C. | Pressure head + velocity head |
| D. | Pressure head - velocity head |
| Answer» B. Velocity head | |
| 190. |
Choose the wrong statement |
| A. | The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface |
| B. | The horizontal component acts through the center of pressure for the vertical projection |
| C. | The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area |
| D. | The vertical component passes through the center of pressure of the volume |
| Answer» D. The vertical component passes through the center of pressure of the volume | |
| 191. |
In open channels, the specific energy is the |
| A. | Total energy per unit discharge |
| B. | Total energy measured with respect to the datum passing through the bottom of the channel |
| C. | Total energy measured above the horizontal datum |
| D. | Kinetic energy plotted above the free surface of water |
| Answer» B. Total energy measured with respect to the datum passing through the bottom of the channel | |
| 192. |
For a floating body to be in stable equilibrium, its metacentre should be |
| A. | Below the center of gravity |
| B. | Below the center of buoyancy |
| C. | Above the center of buoyancy |
| D. | Above the center of gravity |
| Answer» D. Above the center of gravity | |
| 193. |
A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is |
| A. | 2.89 kN |
| B. | 8.29 kN |
| C. | 9.28 kN |
| D. | 28.9 kN |
| Answer» B. 8.29 kN | |
| 194. |
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be |
| A. | 1000 kg |
| B. | 4000 kg |
| C. | 2000 kg |
| D. | 8000 kg |
| Answer» A. 1000 kg | |
| 195. |
If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium. |
| A. | Neutral |
| B. | Stable |
| C. | Unstable |
| D. | None of these |
| Answer» A. Neutral | |
| 196. |
A streamline is defined as the line |
| A. | Parallel to central axis flow |
| B. | Parallel to outer surface of pipe |
| C. | Of equal velocity in a flow |
| D. | Along which the pressure drop is uniform |
| Answer» C. Of equal velocity in a flow | |
| 197. |
The flow in a pipe or channel is said to be non-uniform when |
| A. | The liquid particles at all sections have the same velocities |
| B. | The liquid particles at different sections have different velocities |
| C. | The quantity of liquid flowing per second is constant |
| D. | Each liquid particle has a definite path |
| Answer» B. The liquid particles at different sections have different velocities | |
| 198. |
Hydrometer is used to determine |
| A. | Specific gravity of liquids |
| B. | Specific gravity of solids |
| C. | Specific gravity of gases |
| D. | Relative humidity |
| Answer» A. Specific gravity of liquids | |
| 199. |
The dynamic viscosity of the liquid __________ with rise in temperature. |
| A. | Remain unaffected |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» C. Decreases | |
| 200. |
For pipes, turbulent flow occurs when Reynolds number is |
| A. | Less than 2000 |
| B. | Between 2000 and 4000 |
| C. | More than 4000 |
| D. | Less than 4000 |
| Answer» C. More than 4000 | |
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