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MCQOPTIONS
This section includes 2670 Mcqs, each offering curated multiple-choice questions to sharpen your Railways knowledge and support exam preparation. Choose a topic below to get started.
| 1401. |
The relations between shear stress \[\left( \tau \right)\] and velocity gradient for ideal fluids, Newtonian fluids and non-Newtonian fluids are given below. Select the correct combination: |
| A. | \[\tau =0\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}};\] \[\tau =\mu \,{{\left( \frac{du}{dv} \right)}^{3}}\] |
| B. | \[\tau =0\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}}\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}}\] |
| C. | \[\tau =\mu \,\left( \frac{du}{dy} \right)\,\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}};\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{3}}\] |
| D. | \[\tau =\mu \,\left( \frac{du}{dy} \right)\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}};\] \[\tau =0\] |
| Answer» C. \[\tau =\mu \,\left( \frac{du}{dy} \right)\,\,;\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{2}};\] \[\tau =\mu \,{{\left( \frac{du}{dy} \right)}^{3}}\] | |
| 1402. |
If the diameter of a capillary tube is doubled, the capillary-rise will become: |
| A. | \[\sqrt{2}\] Times less |
| B. | Double |
| C. | Half |
| D. | \[\sqrt{2}\]Times more |
| Answer» D. \[\sqrt{2}\]Times more | |
| 1403. |
Match the following: List-I List-II A. Circular sewer maximum discharge 1. Y= 0.938 D B. Maximum velocity in circular sewer 2. Y=0.81 D C. Triangular Channel 3. \[{{y}_{c}}=\frac{4}{5}\,E,\] \[\frac{v_{c}^{2}}{2g}=\frac{{{y}_{c}}}{4}\] D. Bourdon gauge 4. \[{{y}_{c}}=\frac{2}{3}\,E,\] \[\frac{v_{c}^{2}}{2g}=\frac{{{y}_{c}}}{4}\] Codes: |
| A. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| Answer» E. | |
| 1404. |
Consider the following statements: (1) Streak line indicates instantaneous position of particles of fluid passing through a point. (2) Streamlines are paths traced by a fluid particle with constant velocity. (3) Fluid particles cornot cross streamlines irrespective of the type of flow. (4) Streamlines converge as the fluid is accelerated, and diverge when retarded. Which of these statements are correct? |
| A. | 1 and 4 |
| B. | 1, 3 and 4 |
| C. | 1, 2, and 4 |
| D. | 2 and 3 |
| Answer» D. 2 and 3 | |
| 1405. |
Decrease in temperature, in general, results in: |
| A. | An increase in viscosities of both gases and liquids |
| B. | A decrease in the viscosity of liquids and gases |
| C. | An increase in the viscosity of liquids and an decrease in that of gases |
| D. | A decrease in the viscosity of liquids and an increase in that of gases |
| Answer» D. A decrease in the viscosity of liquids and an increase in that of gases | |
| 1406. |
Match List-I with List-II and select the correct answer using the codes given below the Lists: List-I List-II A. Orifice meter 1. Measurement of flow in channel B. Broad creasted weir 2. Measurement of velocity in a pipe/ channel C. Pitol tube 3. Measurement of flow in a pipe of may inclination D. Rotameter 4. Measurement of upward flow in a vertical pipe Codes: |
| A. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| D. | A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]2 |
| Answer» D. A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]2 | |
| 1407. |
A liquid of specific gravity 0.82 flows with a velocity 4.4 m/s. Its velocity head is: |
| A. | 0.82 m |
| B. | 4.43 m |
| C. | 1 m |
| D. | 19.6 m |
| Answer» D. 19.6 m | |
| 1408. |
Which one of the following equations represents the continuity equation for steady compressible fluid flow? |
| A. | \[\nabla .\rho \,\overline{V}+\frac{\partial \rho }{\partial \,t}=0\] |
| B. | \[\nabla .\rho \,\overline{V}+\frac{\partial \rho }{\partial \,t}=0\] |
| C. | \[\nabla .\overline{V}=0\] |
| D. | \[\nabla .\rho \,\overline{V}=0\] |
| Answer» B. \[\nabla .\rho \,\overline{V}+\frac{\partial \rho }{\partial \,t}=0\] | |
| 1409. |
Match. List-I (Physical properties of fluid) with List-II (Dimension/Definitions) and select the correct answer using codes given below the Lists: List-I List-II A. Absolute viscosity 1. \[\frac{du}{dy}\] is constant B. Kinematic viscosity 2. Newton per metre C. Newtonian fluid 3. Poise D. Surface tension 4. \[\frac{Stress}{Strain}\] constant 5. Strokes Codes: |
| A. | A\[\to \]5, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]3, B\[\to \]5, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]5, B\[\to \]3, C\[\to \]4, D\[\to \]2 |
| D. | A\[\to \]3, B\[\to \]5, C\[\to \]1, D\[\to \]2 |
| Answer» E. | |
| 1410. |
A tank with four equal vertical faces of width/ and depth h is filled up with a liquid. If the force on any vertical side is equal to the force at the bottom, then value of \[\frac{h}{l}\] will be: |
| A. | 2 |
| B. | \[\sqrt{2}\] |
| C. | 1 |
| D. | \[\frac{1}{2}\] |
| Answer» B. \[\sqrt{2}\] | |
| 1411. |
Which one of the following represents equilibrium of a static fluid? (Symbols have the usual meaning) |
| A. | \[\frac{dp}{dz}=-\frac{\rho }{g}\] |
| B. | \[\frac{dp}{g}\,=\,-\,\frac{dz}{\rho }\] |
| C. | \[\rho \,dp=-\frac{dz}{g}\] |
| D. | \[\frac{dp}{\rho }=-g\,dz\] |
| Answer» E. | |
| 1412. |
The standard sea level atmospheric pressure is equivalent to: |
| A. | 10.2 m of freshwater of \[\rho =998\,\,\text{kg/}{{\text{m}}^{\text{3}}}\] |
| B. | 10.2 m of salt water \[\rho =1025\,\,\text{kg/}{{\text{m}}^{\text{3}}}\] |
| C. | 25.5 m of kerosene of \[\rho =800\,\,\text{kg/}{{\text{m}}^{\text{3}}}\] |
| D. | 6.4 m of carbon tetrachloride of \[\rho =1590\,\,\text{kg/}{{\text{m}}^{\text{3}}}\] |
| Answer» C. 25.5 m of kerosene of \[\rho =800\,\,\text{kg/}{{\text{m}}^{\text{3}}}\] | |
| 1413. |
Chezy's formula is given by (m, i, C and V are, respectively, the hydraulic mean depth, slope of the channel, Chezy's constant and average velocity of flow) |
| A. | \[V=i\sqrt{mC}\] |
| B. | \[V=C\sqrt{i\,m}\] |
| C. | \[V=m\sqrt{i\,C}\] |
| D. | \[V=\sqrt{m\,i\,C}\] |
| Answer» C. \[V=m\sqrt{i\,C}\] | |
| 1414. |
A two-dimensional fluid flow is described by the velocity components \[u=5{{x}^{3}},\] \[v=-\,15{{x}^{2}}\,y.\] The stream function at point will be: |
| A. | \[2\,{{\text{m}}^{\text{2}}}\text{/s}\] |
| B. | \[2\,{{\text{m}}^{3}}\text{/s}\] |
| C. | \[10\,{{\text{m}}^{3}}\text{/s}\] |
| D. | \[20\,{{\text{m}}^{3}}\text{/s}\] |
| Answer» B. \[2\,{{\text{m}}^{3}}\text{/s}\] | |
| 1415. |
A pipe friction test shows that, over the range of speeds used for the test, the non-dimensional friction factor \['f'\] varies inversely with Reynolds Number. From this, one can conclude that the: |
| A. | Fluid must be compressible |
| B. | Fluid must be ideal |
| C. | Pipe must be smooth |
| D. | Flow must be laminar |
| Answer» D. Flow must be laminar | |
| 1416. |
The vertical component of force on a curved surface submerged in a static liquid is to the: |
| A. | Mass of the liquid above the curved surface |
| B. | Weight of the liquid above curved surface |
| C. | Product of pressure at C.G. multiplied by the area of the curved surface |
| D. | Product of pressure at C.G. multiplied by the projected area of the curved surface |
| Answer» C. Product of pressure at C.G. multiplied by the area of the curved surface | |
| 1417. |
Consider the following assumptions: 1. Steady flow 2. In viscid flow 3. Flow along a stream line 4. Conservative force field For an ideal fluid, which of the statements are correct? |
| A. | 1 and 2 |
| B. | 1, 2 and 4 |
| C. | 2, 3 and 4 |
| D. | 1, 3 and 4 |
| Answer» B. 1, 2 and 4 | |
| 1418. |
For a real fluid moving with uniform velocity, the pressure: |
| A. | Depends upon depth and orientation |
| B. | is independent of depth but depends upon orientation |
| C. | is independent of orientation but depends upon depth |
| D. | is independent of both depth and orientation |
| Answer» E. | |
| 1419. |
Consider the following statements: 1. Gases are considered incompressible when Mach number is less than 0.2 2. A Newtonian fluid is incompressible and non- viscous 3. An ideal fluid has negligible surface tension which of these statements (s) is/are correct? |
| A. | 2 and 3 |
| B. | 2 alone |
| C. | 1 alone |
| D. | 1 and 3 |
| Answer» C. 1 alone | |
| 1420. |
The thickness of laminar boundary layer at a distance 'X' from the leading edge over a flat plate varies as: |
| A. | \[X\] |
| B. | \[{{X}^{1/2}}\] |
| C. | \[{{X}^{1/5}}\] |
| D. | \[{{X}^{4/5}}\] |
| Answer» C. \[{{X}^{1/5}}\] | |
| 1421. |
Two venturimeters of different area ration are connected at different locations of a pipeline to measure discharge. Similar manometers are used across the two venturimeters to register the head differences. The first venturimeter of area ratio 2 registers a head difference 'h' while the second venturimeter registers '5h?. The area ratio for the second venturimeter is: |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 1422. |
Two identical pipes of length 'L', diameter 'd' and friction factor \[f\] are connected is parallel between two points For the same total volume flow rate with pipe of same diameter 'd' and same friction factor \['f',\] the single length of the pipe will be: |
| A. | \[\frac{L}{2}\] |
| B. | \[\frac{L}{\sqrt{2}}\] |
| C. | \[\sqrt{2}L\] |
| D. | \[\frac{L}{4}\] |
| Answer» B. \[\frac{L}{\sqrt{2}}\] | |
| 1423. |
Bernoulli's equation \[\frac{p}{\rho }+\frac{{{v}^{2}}}{2}=gh=\]constant is applicable for: |
| A. | Steady, frictionless and incompressible flow along a streamline |
| B. | Uniform and frictionless flow along a streamline when \[\rho \] is a function p |
| C. | Steady and frictionless flow along a streamline when \[\rho \] is a function of p |
| D. | Steady, uniform and incomperssible flow along a streamline. |
| Answer» B. Uniform and frictionless flow along a streamline when \[\rho \] is a function p | |
| 1424. |
The continuity equation for 3-dimensional flow \[\frac{\partial u}{\partial x}+\frac{\partial v}{\partial y}+\frac{\partial w}{\partial z}=0\] Is applicable to: (Symbols have usual meanings) |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Ideal fluid flow |
| D. | Ideal as well as viscous fluid flow |
| Answer» D. Ideal as well as viscous fluid flow | |
| 1425. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Device) List-II (Use) A. Barometer 1. Gauge pressure B. Hydrometer 2. Local atmospheric pressure C. U-tube manometer 3. Relative density D. Bourden gauge 4. Pressure differential Codes: |
| A. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| Answer» E. | |
| 1426. |
A rectangular tank of base size \[3\,m\,\,\times \,\,3\,m\] contains oil of specific gravity 0.8 upto a height of 8 m. When it is accelerated at \[2.45\,\text{m/}{{\text{s}}^{\text{2}}}\] vertically upwards, the force on the base of the tank will be: |
| A. | 29400 N |
| B. | 38240 N |
| C. | 78400 N |
| D. | 49050 N |
| Answer» E. | |
| 1427. |
The terminal velocity of small sphere falling in a viscous fluid is: |
| A. | Proportional to the diameter of the sphere |
| B. | Inversely proportional to the viscosity of the fluid |
| C. | Inversely proportional to the diameter of the sphere |
| D. | Proportional to the density of the fluid. |
| Answer» C. Inversely proportional to the diameter of the sphere | |
| 1428. |
The barometric pressure at the base of mountain is 750 mm Hg and at the top 600 mm Hg. If the average air density is \[1\,\,\text{kg/}{{\text{m}}^{\text{3}}}\text{,}\] the height of the mountain is approximately: |
| A. | 2000 m |
| B. | 3000 m |
| C. | 4000 m |
| D. | 5000 m |
| Answer» B. 3000 m | |
| 1429. |
If the velocity distribution in a turbulent boundary layer is given by \[\frac{u}{{{u}_{\infty }}}={{\left( \frac{y}{\delta } \right)}^{1/9}}\] then the ratio of displacement thickness to nominal boundary layer thickness will be: |
| A. | 1.0 |
| B. | 0.6 |
| C. | 0.3 |
| D. | 0.1 |
| Answer» E. | |
| 1430. |
While water passes through a given pipe at a mean velocity 'V, the flow is found to change from laminar to turbulent. If another fluid of specific gravity 0.8 and coefficient of viscosity 20% of that of water, is passed through the same pipe, the transition of flow from laminar to turbulent is expected if the flow velocity is: |
| A. | 2V |
| B. | V |
| C. | V/2 |
| D. | V/4 |
| Answer» E. | |
| 1431. |
From a reservoir, water is drained through two pipes of 10 cm and 20 cm diameter respectively. If the frictional head loss in both the pipes is same, then the ratio of discharge through the larger pipe to that through the smaller pipe will be: |
| A. | \[\sqrt{2}\] |
| B. | \[2\sqrt{2}\] |
| C. | 4 |
| D. | \[4\sqrt{2}\] |
| Answer» E. | |
| 1432. |
In a two-dimensional flow, where u is the x-component and v is the y-component of velocity, the equation of streamline is given by: |
| A. | \[udx-vdy=0\] |
| B. | \[vdx-udy=0\] |
| C. | \[uv\,dx-dy=0\] |
| D. | \[udx+vdy=0\] |
| Answer» C. \[uv\,dx-dy=0\] | |
| 1433. |
If a hydraulic press has a ram of 12.5 cm diameter and plunger of 1.25 cm diameter, what force would be required on the plunger to raise a mass of 1 tonne on the ram? |
| A. | 981 N |
| B. | 98.1 N |
| C. | 9.81 N |
| D. | 0.98 N |
| Answer» C. 9.81 N | |
| 1434. |
The vertical component of the hydrostatic force on a submerged curved surface is the: |
| A. | Mass of liquid vertically above it |
| B. | Weight of the liquid vertically above it |
| C. | Force on a vertical projection of the surface |
| D. | Product of pressure at the centroid and the surface area |
| Answer» C. Force on a vertical projection of the surface | |
| 1435. |
Flow separation is likely to take place when the pressure gradient in the direction of flow is: |
| A. | Zero |
| B. | Adverse |
| C. | Slightly favourable |
| D. | Strongly favourable |
| Answer» D. Strongly favourable | |
| 1436. |
A skater weighing 1000 N skates at a speed of 20 m/s on ice maintained at \[0{}^\circ C.\] the average skating area supporting the skater is \[0.001\,{{m}^{2}}\] and the coefficient of friction between the skatesandice is 0.02. What will be the average thickness of a film of water existing at the interface between the skater and ice? (Take dynamic viscosity of water as \[0.001\,\text{Ns/}{{\text{m}}^{\text{2}}}\]) |
| A. | \[{{10}^{-5m}}\] |
| B. | \[{{10}^{-6}}\] |
| C. | \[{{10}^{-2}}\] |
| D. | Not possible to estimate since there cannot be a possibility, of formation of a thin film of water at interface |
| Answer» B. \[{{10}^{-6}}\] | |
| 1437. |
Match the following: List-I List-II A. Wave drage of a ship 1. Cavitation in pumps and turbines B. Pressure coefficient 2. \[\rho \,r.r\,{{L}^{3}}r\] C. Thoma numbers 3. Re = 0.1 D. Stokes Law 4. \[\frac{\Delta \,p}{\rho \,{{\text{V}}^{\text{2}}}\text{/}\,\text{2}}\] Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| Answer» E. | |
| 1438. |
In which of the following cases frictional drag is predominating? 1. Tennis ball 2. Parachute 3. Arrow 4. Cyclist |
| A. | 1 and 2 only |
| B. | 2 and 3 |
| C. | 2, 3 and 4 only |
| D. | 1, 2 and 3 only |
| Answer» E. | |
| 1439. |
A \[\frac{1}{25}\] model of a ship it to be tested for estimating the wave drag. If the speed of the prototype is 1.0 m/s, then the speed at which the model must be tested is: |
| A. | 0.04 m/s |
| B. | 0.2 m/s |
| C. | 5.0 m/s |
| D. | 25.0 m/s |
| Answer» C. 5.0 m/s | |
| 1440. |
In a rotameter as the flow rate increases, the float: |
| A. | Rotates at higher speed |
| B. | Rotates at lower speed |
| C. | Rises in the tube |
| D. | Drops in the tube |
| Answer» D. Drops in the tube | |
| 1441. |
Hydrodynamic and thermal boundary layer thickness are equal for Prandtl number: |
| A. | Equal to zero |
| B. | Less than 1 |
| C. | Equal to 1 |
| D. | More than 1 |
| Answer» D. More than 1 | |
| 1442. |
Length of mercury column at a place at an altitude will vary with respect to that at ground in a |
| A. | linear relation |
| B. | hyperbolic relation |
| C. | parabolic relation |
| D. | manner first slowly and then steeply |
| Answer» E. | |
| 1443. |
A flow field which has only convective acceleration is |
| A. | a steady uniform flow |
| B. | an unsteady uniform flow |
| C. | a steady non-uniform flow |
| D. | an unsteady non-uniform flow |
| Answer» D. an unsteady non-uniform flow | |
| 1444. |
The degree of reaction of a kaplan turbine is : |
| A. | equal to 1 |
| B. | equal to 180 |
| C. | Greater than zero but less than 1 11 |
| D. | Greater than 1/2 but less than 1 |
| Answer» E. | |
| 1445. |
The function of hydraulic turbine is to convert water energy into: |
| A. | Heat energy |
| B. | Electrical energy |
| C. | Atomic energy |
| D. | Mechanical energy |
| Answer» E. | |
| 1446. |
Energy loss in flow through nozzle as compared to ventun meter is: |
| A. | Same |
| B. | More |
| C. | Less |
| D. | Unpredictable |
| Answer» B. More | |
| 1447. |
An impulse turbine is used for: |
| A. | Low head of water |
| B. | High head of water |
| C. | Medium head of water |
| D. | High discharge |
| Answer» C. Medium head of water | |
| 1448. |
The surge tanks are used in a pipeline to: |
| A. | reduce frictional loss in pipe |
| B. | ensure uniform flow in pipe |
| C. | relieve the pressure due to water hammer |
| D. | reduce cavitation |
| Answer» D. reduce cavitation | |
| 1449. |
Which of the following parameter is measured using orifices? |
| A. | Velocity |
| B. | Pressure |
| C. | Flow rate |
| D. | Both pressure and velocity |
| Answer» D. Both pressure and velocity | |
| 1450. |
In the Navier, stoke equation, the forces considered are: |
| A. | Gravity, pressure and viscous |
| B. | Pressure, viscous and turbulence |
| C. | Gravity, pressure, and turbulence |
| D. | Pressure, gravity, turbulence and viscous |
| Answer» B. Pressure, viscous and turbulence | |