MCQOPTIONS
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MCQOPTIONS
This section includes 119 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Orifice meter uses which of the following principle/law for its operations? |
| A. | Pascal law |
| B. | Darcy's Law |
| C. | Bernoulli's law |
| D. | Newton's law |
| Answer» D. Newton's law | |
| 52. |
In a free vortex motion, the tangential velocity of water particular is proportional toA. distance from the centre (r)B. r2C. 1/rD. \(\frac{1}{{{r^2}}}\) |
| A. | Only A |
| B. | Only B |
| C. | Only C |
| D. | Only D |
| Answer» D. Only D | |
| 53. |
For measuring flow by a Venturimeter, it should be installed in _______. |
| A. | Vertical line |
| B. | Horizontal line |
| C. | Inclined line with upward flow |
| D. | In any direction and in any location |
| Answer» E. | |
| 54. |
A fluid jet is discharging from a 100 mm nozzle and the vena contracta formed has a diameter of 90 mm If the coefficient of velocity is 0.98, then the coefficient of discharge for the nozzle is: |
| A. | 0.673 |
| B. | 0.794 |
| C. | 0.872 |
| D. | 0.971 |
| Answer» C. 0.872 | |
| 55. |
Oil at 20°C (density = 870 kg/m3) and viscosity = 0.104 kg/m-s) flows (laminar flow) at 1.1 m3/hr through a horizontal pipe with diameter d = 2 cm and length L = 12 m. Find the power required to cause the flow |
| A. | 29.7 W |
| B. | 35.8 W |
| C. | 15.7 W |
| D. | 49.8 W |
| Answer» B. 35.8 W | |
| 56. |
Bernoulli’s equation is applicable for |
| A. | Viscous and compressible fluid flow |
| B. | Inviscid and compressible fluid flow |
| C. | Inviscid and incompressible fluid flow |
| D. | Viscous and incompressible fluid flow |
| Answer» D. Viscous and incompressible fluid flow | |
| 57. |
An air vessel is usually provided at the summit of a syphon in order to |
| A. | regulate the flow |
| B. | increase discharge |
| C. | avoid interruption in flow |
| D. | increase velocity |
| Answer» D. increase velocity | |
| 58. |
According to Bernoulli’s theorem, in a _____ flow, the sum of all forms of energy in a fluid along a streamline is the same at all points on that streamline. |
| A. | Steady |
| B. | Viscous |
| C. | Turbulent |
| D. | Gravity |
| Answer» B. Viscous | |
| 59. |
According to Bernoulli’s equation for a perfect incompressible fluid flow which of the following relation is correct:where Z is the potential head, p is the pressure, w is the weight density, v is the velocity and g is acceleration due to gravity |
| A. | \(Z + \frac pw + \frac {v^2}{2g}= Constant \) |
| B. | \(Z + \frac pw - \frac {v^2}{2g}= Constant \) |
| C. | \(Z - \frac pw + \frac {v^2}{2g}= Constant \) |
| D. | \(Z -\frac pw - \frac {v^2}{2g}= Constant \) |
| Answer» B. \(Z + \frac pw - \frac {v^2}{2g}= Constant \) | |
| 60. |
A pipe of diameter 10 cm, carrying water at 5 m/s, reduces into a smaller diameter of 5 cm. The velocity in the smallest diameter section is: |
| A. | 2.5 m/s |
| B. | 20 m/s |
| C. | 1.25 m/s |
| D. | 10 m/s |
| Answer» C. 1.25 m/s | |
| 61. |
For steady incompressible flow through a closed-conduit of uniform cross-section, the direction of flow will always be: |
| A. | from higher to lower elevation |
| B. | from higher to lower pressure |
| C. | from higher to lower velocity |
| D. | from higher to lower piezometric head |
| Answer» E. | |
| 62. |
In the context of the Reynolds transport theorem. which of the following statements is the most appropriate |
| A. | It uses fixed control volume |
| B. | It links system and control volume approaches |
| C. | It does not use control volume approach |
| D. | It uses deforming control volume |
| Answer» C. It does not use control volume approach | |
| 63. |
In fluid flow, the line of constant piezometric head passes through two points which have the same: |
| A. | Elevation |
| B. | Pressura |
| C. | Velocity |
| D. | Velocity potential |
| Answer» D. Velocity potential | |
| 64. |
According to Bernoulli's principle in fluid dynamics, for inviscid flow, an increase in speed of fluid leads to which of the following? |
| A. | Increase in pressure and/or increase in fluid's potential energy |
| B. | Decrease in pressure and/or increase in fluid's potential energy |
| C. | Increase in pressure and/or decrease in fluid's potential energy |
| D. | Decrease in pressure and/or decrease in fluid's potential energy |
| Answer» E. | |
| 65. |
A circular tank of 4 m diameter is filled up to a height of 3 m. Assuming almost steady flow and neglecting losses, the time taken in seconds to empty the tank through a 5 cm diameter hole located at the center of the tank bottom (take acceleration due to gravity g = 9.81 m/s2 ) is [round off to the nearest integer] |
| A. | 5005 |
| B. | 1807 |
| C. | 8097 |
| D. | 3154 |
| Answer» B. 1807 | |
| 66. |
For a siphon to work satisfactorily, the minimum pressure in the pipe as compared to vapor pressure of liquid should be |
| A. | more |
| B. | less |
| C. | equal |
| D. | None of these |
| Answer» B. less | |
| 67. |
A conical diffuser 3 m long is placed vertically. The velocity at the top (entry) is 4 m/s and at the lower end is 2 m/s. The pressure head at the top is 2 m of the oil flowing through the diffuser. The head loss in the diffuser is 0.4 m of the oil. The pressure head at the exit is: |
| A. | 3.18 m of oil |
| B. | 5.12 m of oil |
| C. | 7.18 m of oil |
| D. | 9.21 m of oil |
| Answer» C. 7.18 m of oil | |
| 68. |
If a mouthpiece is running full at the outlet, the vacuum at vena-contracta _____. |
| A. | Increases velocity of jet. |
| B. | Decreases velocity of jet |
| C. | Decreases the discharge |
| D. | Decreases the value of coefficient of contraction |
| Answer» B. Decreases velocity of jet | |
| 69. |
Euler's equation for the motion of liquid 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 with stream line |
| Answer» C. Velocity of flow is non - uniform over the section | |
| 70. |
How are the velocity coefficient Cv, the discharge coefficient Cd and the contraction coefficient Cc of an orifice related |
| A. | \({C_v} = {C_c}{C_d}\) |
| B. | \({C_c} = {C_v}{C_d}\) |
| C. | \({C_d} = {C_c}{C_v}\) |
| D. | \({C_v} = {C_c}{C_d} = 1\) |
| Answer» D. \({C_v} = {C_c}{C_d} = 1\) | |
| 71. |
A vertical cylindrical tank, 2 m diameter has, at the bottom, a 5 cm diameter, sharp-edged orifice, for which Cd =0.6. Water enters the tank at a constant rate of 9l/sec. At what depth above the orifice will the level in the tank become steady? |
| A. | 2.95 m |
| B. | 2.75 m |
| C. | 2.60 m |
| D. | 2.50 m |
| Answer» B. 2.75 m | |
| 72. |
Continuity equation deals with the law of conservation of ________ |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | None of the above |
| Answer» B. Momentum | |
| 73. |
Bernoulli’s theorem for liquid is applicable for which of the following? |
| A. | Viscous fluids |
| B. | Incompressible fluids |
| C. | Compressible fluids |
| D. | Turbulent flow |
| Answer» C. Compressible fluids | |
| 74. |
Linear momentum equation for steady flow with fixed control volume is given by [Where, V : Velocity vector, \(\hat n\): outward normal unit vector of area dA, F = forces on control volume]: |
| A. | \(\sum F = \mathop \smallint \nolimits_{cs} \rho V(V.\hat n)\;dA\) |
| B. | \(\sum F = \mathop \smallint \nolimits_{cs} \rho V(V \times \hat n)dA\) |
| C. | \(\sum F = \mathop \smallint \nolimits_{cs} \rho \left( {V \times V} \right) \cdot \hat ndA\) |
| D. | \(\sum F = \mathop \smallint \nolimits_{cs} \rho (V \cdot \hat n)dA\) |
| Answer» B. \(\sum F = \mathop \smallint \nolimits_{cs} \rho V(V \times \hat n)dA\) | |
| 75. |
Bernoulli’s equation is not applicable for |
| A. | Steady flow |
| B. | Incompressible flow |
| C. | Flow with work transfer |
| D. | Frictionless flow |
| Answer» D. Frictionless flow | |
| 76. |
Bernoulli’s equation is used for: |
| A. | laminar viscous flows |
| B. | incompressible fluid |
| C. | viscous flows at high speeds |
| D. | turbulent flow |
| Answer» C. viscous flows at high speeds | |
| 77. |
In a flow-measuring device, what is velocity head? |
| A. | Free rise of the liquid column in an open-ended tube |
| B. | Vertical distance through which a column of the flowing liquid would rise in an open-ended tube |
| C. | Free fall of liquid column to attain a given velocity freely |
| D. | Difference in elevation in the flow direction |
| Answer» D. Difference in elevation in the flow direction | |
| 78. |
Equation of continuity results from the principal of conservation of _____. |
| A. | Energy |
| B. | Flow |
| C. | Mass |
| D. | Momentum |
| Answer» D. Momentum | |
| 79. |
An open tank is filled with water to a height of 20 m. What is the velocity of the water flow at the outlet, if the outlet is at the base of the tank? |
| A. | 40 m/s (approx.) |
| B. | 20 m/s (approx.) |
| C. | 10 m/s (approx.) |
| D. | 5 m/s (approx.) |
| Answer» C. 10 m/s (approx.) | |
| 80. |
A siphon draws water from a reservoir and discharges it out at atmospheric pressure. Assuming ideal fluid and the reservoir is large, the velocity at point P in the siphon tube is: |
| A. | \(\sqrt {2g{h_1}}\) |
| B. | \(\sqrt {2g{h_2}}\) |
| C. | \(\sqrt {2g\left( {{h_2} - {h_1}} \right)}\) |
| D. | \(\sqrt {2g\left( {{h_2} + {h_1}} \right)}\) |
| Answer» D. \(\sqrt {2g\left( {{h_2} + {h_1}} \right)}\) | |
| 81. |
A flow field satisfying \(\nabla .\;\vec V = 0\) as the continuity equation represents always |
| A. | a steady compressible flow |
| B. | an incompressible flow |
| C. | an unsteady and incompressible flow |
| D. | an unsteady and compressible flow |
| Answer» C. an unsteady and incompressible flow | |
| 82. |
A right circular cylinder, open at the top is filled with a liquid of relative density 1.2. It is rotated about its vertical axis at such a speed that half the liquid spills out. The pressure at the centre of the bottom will be |
| A. | Zero |
| B. | One-fourth of the value when the cylinder was full |
| C. | Half of the value when the cylinder was full |
| D. | Not determinable from the given data |
| Answer» B. One-fourth of the value when the cylinder was full | |
| 83. |
A piezometer and a Pitot tube are tapped into a horizontal water pipe, as shown in figure. The velocity of water at the center of the pipe is |
| A. | 2.4 m/s |
| B. | 1.53 m/s |
| C. | 2.07 m/s |
| D. | 1.93 m/s |
| Answer» C. 2.07 m/s | |
| 84. |
A two-dimensional incompressible frictionless flow field is given by \(\vec u = x\hat i - y\hat j\). If ρ is the density of the fluid, the expression for pressure gradient vector at any point in the flow field is given as |
| A. | \(\rho \left( {x\hat i + y\hat j} \right)\) |
| B. | \( - \rho \left( {x\hat i + y\hat j} \right)\) |
| C. | \(\rho \left( {x\hat i - y\hat j} \right)\) |
| D. | \( - \rho \left( {{x^2}\hat i + {y^2}\hat j} \right)\) |
| Answer» C. \(\rho \left( {x\hat i - y\hat j} \right)\) | |
| 85. |
Euler’s equation in the differential form for motion of liquids is given byA. \(\frac{{dp}}{\rho } - gdz + vdv = 0\)B. \(\frac{{dp}}{\rho } + gdz - vdv = 0\)C. \(\frac{{dp}}{\rho } + gdz + vdv = 0\)D. \(pdp + gdz + vdv = 0\) |
| A. | Only A |
| B. | Only B |
| C. | Only C |
| D. | Only D |
| Answer» D. Only D | |
| 86. |
A stagnation point is a point |
| A. | Where the pressure is zero |
| B. | Where the total energy is zero |
| C. | Where the velocity of flow reduces to zero |
| D. | Where the total energy is maximum |
| Answer» D. Where the total energy is maximum | |
| 87. |
In order, to avoid separation in Venturi meter the angle of divergence is kept |
| A. | 10° to 15° |
| B. | 15° to 20° |
| C. | 5° to 7° |
| D. | 7° to 10° |
| Answer» D. 7° to 10° | |
| 88. |
Bernoulli’s equation cannot be applied when the flow is: |
| A. | Streamlined |
| B. | Irrotational |
| C. | Rotational |
| D. | Non viscous |
| Answer» D. Non viscous | |
| 89. |
A short tube of length not more than two or three times its diameter, which is fitted to a circular opening in a tank is known as_______. |
| A. | orifice |
| B. | mouth piece |
| C. | weir |
| D. | notch |
| Answer» C. weir | |
| 90. |
Bernoulli’s equation \(\frac{p}{\rho } + \frac{{{v^2}}}{2} + gZ = \;\)Constant, is valid for:1. Steady flow2. Viscous flow3. Incompressible flow4. Flow along a streamlineWhich of the above are correct? |
| A. | 1, 2 and 3 |
| B. | 1,2 and 4 |
| C. | 1, 3 and 4 |
| D. | 2,3 and 4 |
| Answer» D. 2,3 and 4 | |
| 91. |
A jet of water discharging from a 40 mm diameter orifice has minimum area corresponding to dia of 24.4 mm at its vena contracta. The coefficient of contraction is |
| A. | 0.46 |
| B. | 0.37 |
| C. | 0.78 |
| D. | 0.87 |
| Answer» C. 0.78 | |
| 92. |
Bernoulli's equation is derived making assumptions that |
| A. | the flow is uniform and incompressible |
| B. | the flow is non-viscous, uniform and steady |
| C. | the flow is steady, non-viscous, and incompressible |
| D. | none of the above |
| Answer» D. none of the above | |
| 93. |
Bernoulli’s equation is applicable between any two points in a flow field when |
| A. | Flow is steady, compressible and irrotational |
| B. | Flow is steady, incompressible and irrotational |
| C. | Flow is unsteady, compressible and rotational |
| D. | Flow is unsteady, incompressible and irrotational |
| Answer» C. Flow is unsteady, compressible and rotational | |
| 94. |
Bernoulli's equation is applicable between any two points located in |
| A. | Rotational flow of an incompressible fluid |
| B. | Irrotational flow of compressible or incompressible fluid |
| C. | Steady, rotational flow of an incompressible fluid |
| D. | Steady, irrotational flow of an incompressible fluid |
| Answer» E. | |
| 95. |
A sphere is settling down in viscous fluid at a Reynolds number 0.24. Its drag coefficient is: |
| A. | 100 |
| B. | 200 |
| C. | 20 |
| D. | 10 |
| Answer» B. 200 | |
| 96. |
A vertical water pipe, 1.5 m long, tapers some distance from 75 mm diameter at the bottom then straightens to 150 mm diameter at the top at the rate of flow is 50 L/s upwards. If the pressure at the bottom end is 150 kN/m2, the pressure at the top will be nearly |
| A. | 196.65 kN/m2 |
| B. | 191.4 kN/m2 |
| C. | 187.6 kN/m2 |
| D. | 183.8 kN/m2 |
| Answer» B. 191.4 kN/m2 | |
| 97. |
A siphon is used to drain water from a large tank as shown in the figure below. Assume that the level of water is maintained constant. Ignore frictional effect due to viscosity and losses at entry and exit. At the exit of the siphon, the velocity of water is |
| A. | \(\sqrt {2g\left( {{Z_Q} - {Z_R}} \right)} \) |
| B. | \(\sqrt {2g\left( {{Z_P} - {Z_R}} \right)} \) |
| C. | \(\sqrt {2g\left( {{Z_O} - {Z_R}} \right)}\) |
| D. | \(\sqrt {2g{Z_Q}} \) |
| Answer» C. \(\sqrt {2g\left( {{Z_O} - {Z_R}} \right)}\) | |
| 98. |
On which of the following principle Bernoulli’s equation is based? |
| A. | Conservation of momentum |
| B. | Conservation of energy |
| C. | Conservation of mass |
| D. | Archimedes principle |
| Answer» C. Conservation of mass | |
| 99. |
In a siphon, the summit is 3 m above the water level in the reservoir from which the flow is being discharged. If the head loss from the inlet of the siphon to the summit is 1.5 m and the velocity head at the summit is 0.5 m, the absolute pressure at the summit is |
| A. | 5.3 m of water |
| B. | 9.3 m of water |
| C. | 6.3 m of water |
| D. | 5 m of water |
| Answer» B. 9.3 m of water | |
| 100. |
Between section 1 and 2 of a pipe a pump, a heater, a very rough pipe and an orifice plate are placed. The Bernoulli equation can be applied between 1 and 2 if |
| A. | Orifice plate and heater are removed |
| B. | Heater pump and heater are removed |
| C. | Heater and pump are removed |
| D. | Heater, rough pipe and orifice plates are removed |
| Answer» B. Heater pump and heater are removed | |