MCQOPTIONS
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MCQOPTIONS
This section includes 297 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The differential equation dp/ρ + gdz + vdv = 0 for a fluid motion is suggested by |
| A. | Bernoulli |
| B. | Cauchy-Riemann |
| C. | Laplace |
| D. | Leonard Euler. |
| Answer» E. | |
| 202. |
In fluids, steady flow occurs when |
| A. | conditions of flow change steadily with time |
| B. | conditions of flow do not change with time at a point |
| C. | conditions of flow remain the same at adjacent point |
| D. | velocity vector remains constant at a point. |
| Answer» C. conditions of flow remain the same at adjacent point | |
| 203. |
Differential manometers are used to measure |
| A. | pressure in water channels, pipes, etc. |
| B. | difference in pressure at two points |
| C. | atmospheric pressure |
| D. | very low pressure. |
| Answer» C. atmospheric pressure | |
| 204. |
For pipes not running full, the hydraulic mean depth is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 205. |
For a most economical rectangular channel, the width of the channel must be |
| A. | equal to depth of flow |
| B. | twice the depth of flow |
| C. | half the depth of flow |
| D. | None of these. |
| Answer» C. half the depth of flow | |
| 206. |
Manning's formula is used for |
| A. | flow in open channels |
| B. | head loss due to friction in open channels |
| C. | head loss due to friction in pipes flowing full |
| D. | flow in pipes. |
| Answer» C. head loss due to friction in pipes flowing full | |
| 207. |
Pick up the correct statement regarding Borda's mouth piece running full from the following : |
| A. | Actual velocity at the out let is √gH |
| B. | Theoretical velocity at the outlet is √2gH |
| C. | Coefficient of velocity is 1/√2 |
| D. | All the above. |
| Answer» E. | |
| 208. |
For critical depth of flow of water in open channels, fc the specific energy must be : |
| A. | minimum |
| B. | maximum |
| C. | average of maximum and minimum |
| D. | None of these. |
| Answer» B. maximum | |
| 209. |
If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then |
| A. | Cd = Cc . Cv |
| B. | Cr = 1 + Cv²/Cd |
| C. | Cv = Cc + Cd |
| D. | Cc = Cv/Cd |
| Answer» B. Cr = 1 + Cv²/Cd | |
| 210. |
For steady flow in open channels, which one of the following does not change : |
| A. | depth of flow |
| B. | velocity of flow |
| C. | rate of flow |
| D. | All of these. |
| Answer» E. | |
| 211. |
The horizontal component of the force on a curved surface is equal to |
| A. | weight of liquid vertically below the curved surface |
| B. | force on a vetical projection of the curved surface |
| C. | product of pressure at its centroid and the area |
| D. | weight of liquid retained by the curved area. |
| Answer» C. product of pressure at its centroid and the area | |
| 212. |
The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is |
| A. | π |
| B. | 2π |
| C. | 3π |
| D. | 4π |
| Answer» D. 4π | |
| 213. |
Flow of water in pipes of diameter more than 3 metres, can be measured by |
| A. | pitot tube |
| B. | venturimeter |
| C. | orifice plate |
| D. | rotameter. |
| Answer» E. | |
| 214. |
If a1 and a2 are the cross-sectional areas of a tank and orifice, h the height of water level in tank above the centre of the orifice, the velocity of approach is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 215. |
If E1 and E2 are the specific energies at the start of back water curve and at the maximum rise of water respectively and ib and ie are the head slope and the energy line slope respectively, the length of back water (L) is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 216. |
To replace a pipe of diameter D by n parallel pipes of diameter d, the formula is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 217. |
The pressure rise due to water hammer depends upon |
| A. | the velocity of flow of water in the pipe |
| B. | the length of pipe |
| C. | time taken to close the valve |
| D. | All of above. |
| Answer» E. | |
| 218. |
The ratio of time for completely emptying the hemispherical tank and circular horizontal tank of equal radii both fitted with similar orifices at their bottoms is : |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 219. |
Total head of a liquid particle in motion is the sum of |
| A. | potential head and kinetic head |
| B. | kinetic head and pressure head |
| C. | potential head and pressure head |
| D. | potential head, kinetic head and pressure head. |
| Answer» E. | |
| 220. |
Back water curve is caused if |
| A. | friction head loss is more than the bed slope |
| B. | pressure is due to weir in the channel |
| C. | there is an increase in width of the channel |
| D. | none of these. |
| Answer» C. there is an increase in width of the channel | |
| 221. |
The flow in open channel is said to be critical if the Froude number is : |
| A. | less than 1.0 |
| B. | equal to 1.0 |
| C. | greater than 1.0 |
| D. | None of these. |
| Answer» C. greater than 1.0 | |
| 222. |
In flowing liquids pitot tubes are used measure |
| A. | discharge |
| B. | pressure |
| C. | velocity |
| D. | depth. |
| Answer» D. depth. | |
| 223. |
For maximum horse power of a nozzle, the head supplied must be equal to |
| A. | head loss in the pipe due to friction |
| B. | twice the head loss in the pipe due to friction |
| C. | thrice the head loss in the pipe due to friction |
| D. | four times the head loss in the pipe due to friction. |
| Answer» D. four times the head loss in the pipe due to friction. | |
| 224. |
Fluids change the volume under external presssure due to |
| A. | plasticity |
| B. | viscosity |
| C. | compressibility |
| D. | none of these. |
| Answer» D. none of these. | |
| 225. |
The ratio of frictional factor and coefficient of friction used in general equation for a head loss in a pipe, is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 226. |
A tank 4m x 3m x 2m containing an oil of specific gravity 0.83 is moved with an acceleration g/2 m sec². The ratio of the pressures at its bottom when it is moving vertically up and down, is |
| A. | 2 |
| B. | 3 |
| C. | 1/2 |
| D. | 1/3 |
| Answer» C. 1/2 | |
| 227. |
Unit of kinematic viscosity is |
| A. | m²/sec |
| B. | Newton sec/m² |
| C. | Newton sec/m³ |
| D. | Kg sec/m². |
| Answer» B. Newton sec/m² | |
| 228. |
Weber number is the ratio of inertia force to |
| A. | surface tension |
| B. | gravitational force |
| C. | elasticity |
| D. | viscosity. |
| Answer» B. gravitational force | |
| 229. |
The minimum specific energy of flow of water in open channel is : (where hc is the critical depth) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 230. |
In a circular pipe of length L and diameter d, a viscous liquid is flowing with a velocity v. The loss in head, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 231. |
The length of pipe is L, velocity of flow of a liquid in the pipe is V. If t is the time in second required to close the valve, the head of pressure |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 232. |
The terminal velocity (v) of a sphere of radius r and specific weight W, which travels vertically downwards in a liquid of viscosity μ and specific weight W, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 233. |
The flow in a channel is said to be non-uniform, if |
| A. | free water surface of an open channel is not parallel to the bed of channel |
| B. | head needed to overcome frictional reistance is less than the drop in elevation of channel bed |
| C. | head needed to overcome frictional resistance is more than the drop in elevation of channel bed |
| D. | all the above. |
| Answer» E. | |
| 234. |
The ratio of the percentagge error in the discharge and percentage error in the measurement of head over a triangular notch, is |
| A. | 2/3 |
| B. | 3/2 |
| C. | 2/5 |
| D. | 5/2 |
| Answer» E. | |
| 235. |
If H is the difference of liquid levels on two sides of an orifice (width b, depth d), the discharge through the orifice will be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 236. |
A load w is rolled a distance d across the deck of a ship of weight W, due to which the ship heels through θ°. The metacentric height of the ship, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 237. |
Orifice-meter is used to measure |
| A. | pressure at the point |
| B. | discharge |
| C. | average speed |
| D. | velocity. |
| Answer» C. average speed | |
| 238. |
The initial difference between liquid levels of two identical cylindrical vessels having their area of cross-section A, is H. Flow time T from one vessel to another through an orifice having coefficient of discharge Cd and area a will be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 239. |
The velocity distribution of viscous fluid through a circular/pipe is : |
| A. | hyperbolic |
| B. | circular |
| C. | parabolic |
| D. | elliptical. |
| Answer» D. elliptical. | |
| 240. |
From a nozzle exposed to atmosphere, the liquid jet traverses |
| A. | a straight line |
| B. | a circular path |
| C. | an elliptical path |
| D. | a parabolic path. |
| Answer» E. | |
| 241. |
In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be |
| A. | 2 mm |
| B. | 4 mm |
| C. | 6 mm |
| D. | 8 mm |
| Answer» D. 8 mm | |
| 242. |
For a most economical trapezoidal open channel, the half of the top width must be equal to |
| A. | the bed width |
| B. | one sloping side |
| C. | the depth of flow |
| D. | None of these. |
| Answer» C. the depth of flow | |
| 243. |
The continuity equation |
| A. | expresses the relationship between work and energy |
| B. | relates the momentum per unit volume between two points on a stream line |
| C. | relates mass rate of flow along a stream line |
| D. | requires that Newton's second law of motion be satisfied at every point in fluid. |
| Answer» D. requires that Newton's second law of motion be satisfied at every point in fluid. | |
| 244. |
The discharge through an internal mouth piece is more if its length is |
| A. | < 1/2 diameter |
| B. | < diameter |
| C. | ≥ diameter |
| D. | none of these. |
| Answer» D. none of these. | |
| 245. |
When water flows over a rectangular suppressed weir, the negative pressure created beneath the nappe |
| A. | increases the discharge |
| B. | decreases the discharge |
| C. | does not effect the discharge |
| D. | none of these. |
| Answer» B. decreases the discharge | |
| 246. |
In the following Newton's viscosity equation, the coefficient (μ) is known as coefficient of |
| A. | viscosity |
| B. | absolute viscosity |
| C. | dynamic viscosity |
| D. | all the above |
| Answer» E. | |
| 247. |
Euler's equation for the motion of liquids assumes that |
| A. | fluid is viscous |
| B. | fluid is homogeneous and incompressible |
| C. | velocity of flow is non-uniform over the section |
| D. | flow is unsteady along the stream line. |
| Answer» C. velocity of flow is non-uniform over the section | |
| 248. |
For uniform flow in canals |
| A. | there is a balance between the frictional loss and drop in elevation of the channel |
| B. | bed and free water surfaces of a channel are parallel to each other |
| C. | bed of channel represents the hydraulic gradient |
| D. | all the above. |
| Answer» E. | |
| 249. |
To avoid the tendency of separation of liquid flow, the most suitable ratio of the diameters of the throat and the pipe, is |
| A. | 1/4 to 1/8 |
| B. | 1/3 to 1/2 |
| C. | 1/2 to 3/4. |
| D. | none of these. |
| Answer» C. 1/2 to 3/4. | |
| 250. |
The ratio of the maximum height to which a jet inclined through θ rises to its total horizontal span is |
| A. | 1/4sin θ |
| B. | 1/4cos θ |
| C. | 1/4tan θ |
| D. | 1/4cot θ |
| Answer» D. 1/4cot θ | |