MCQOPTIONS
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MCQOPTIONS
This section includes 2158 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 1001. |
The equation given below is called the __________ . |
| A. | Colebrook formula |
| B. | Von-Karman equation |
| C. | Fanning equation |
| D. | none of these |
| Answer» C. Fanning equation | |
| 1002. |
The terminal velocity of a particle moving through a fluid varies as dₚⁿ. The value of n is equal to __________ in Stoke's law regime. |
| A. | 1 |
| B. | 0.5 |
| C. | 2 |
| D. | 1.5 |
| Answer» D. 1.5 | |
| 1003. |
Hydraulic mean radius for flow through packed bed of spherical particle of size, 'Dₚ', with porosity 'ε' is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1004. |
A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL. |
| A. | ρL . Vg |
| B. | ρL . A.Hg |
| C. | ρL . Vg/2 |
| D. | ρL .Vg/3 |
| Answer» C. ρL . Vg/2 | |
| 1005. |
Each term of the Bernoulli's equation written in the following form, represents the total energy per unit |
| A. | mass |
| B. | volume |
| C. | specific weight |
| D. | none of these |
| Answer» B. volume | |
| 1006. |
The shear stress between the two liquid layers is __________ proportional to the distance between two layers. |
| A. | directly |
| B. | indirectly |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1007. |
A structure used to dam up a stream or river over which the water flows is called |
| A. | orifice |
| B. | notch |
| C. | weir |
| D. | dam |
| Answer» D. dam | |
| 1008. |
Stoke is the unit of |
| A. | kinematic viscosity in C. G. S. units |
| B. | kinematic viscosity in M. K. S. units |
| C. | dynamic viscosity in M. K. S. units |
| D. | dynamic viscosity in S. I. units |
| Answer» B. kinematic viscosity in M. K. S. units | |
| 1009. |
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a |
| A. | notch |
| B. | weir |
| C. | mouthpiece |
| D. | nozzle |
| Answer» D. nozzle | |
| 1010. |
Water is __________ liquid. |
| A. | a compressible |
| B. | an incompressible |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1011. |
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because |
| A. | it is easier to see through the glass tube |
| B. | glass tube is cheaper than a metallic tube |
| C. | it is not possible to conduct this experiment with any other tube |
| D. | all of the above |
| Answer» B. glass tube is cheaper than a metallic tube | |
| 1012. |
The flow in a pipe is neither laminar nor turbulent when Reynold number is |
| A. | less than 2000 |
| B. | between 2000 and 2800 |
| C. | more than 2800 |
| D. | none of these |
| Answer» C. more than 2800 | |
| 1013. |
The separation of flow occurs when the hydrodynamic boundary layer thickness is reduced to zero. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1014. |
A vessel of 4 m³ contains an oil which weighs 30 kN. The specific weight of the oil is |
| A. | 4.5 kN/m³ |
| B. | 6 kN/m³ |
| C. | 7.5 kN/m³ |
| D. | 10 kN/m³ |
| Answer» D. 10 kN/m³ | |
| 1015. |
When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow. |
| A. | less than |
| B. | more than |
| C. | Can't say |
| D. | None of these |
| Answer» B. more than | |
| 1016. |
Bulk modulus of a fluid __________ as the pressure increases. |
| A. | remains same |
| B. | decreases |
| C. | increases |
| D. | None of these |
| Answer» D. None of these | |
| 1017. |
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is |
| A. | 14π R1/2/15Cd × a √(2g) |
| B. | 14π R3/2/15Cd × a √(2g) |
| C. | 14π R5/2/15Cd × a √(2g) |
| D. | 14π R7/2/15Cd × a √(2g) |
| Answer» D. 14π R7/2/15Cd × a √(2g) | |
| 1018. |
The pressure at a stagnation point is always low. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1019. |
In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta. |
| A. | less than |
| B. | more than |
| C. | Can't say |
| D. | None of these |
| Answer» B. more than | |
| 1020. |
The divergent portion of a venturimeter is made longer than convergent portion in order to |
| A. | avoid the tendency of breaking away the stream of liquid |
| B. | to minimise frictional losses |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 1021. |
All the gases are considered to have compressible flow and all the liquids are considered to have incompressible flow. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1022. |
The unit of kinematic viscosity in S. I. units is |
| A. | N-m/s |
| B. | N-s/m² |
| C. | m²/s |
| D. | N-m |
| Answer» D. N-m | |
| 1023. |
Re-entrant or Borda's mouthpiece is an __________ mouthpiece. |
| A. | internal |
| B. | external |
| C. | Can't say |
| D. | None of these |
| Answer» B. external | |
| 1024. |
A flow whose streamline is represented by a straight line, is called __________ dimensional flow. |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» B. two | |
| 1025. |
A flow in which the quantity of liquid flowing per second is constant, is called __________ flow. |
| A. | steady |
| B. | streamline |
| C. | turbulent |
| D. | unsteady |
| Answer» B. streamline | |
| 1026. |
The sheet of water flowing over a notch or a weir is known as |
| A. | sill or crest |
| B. | nappe or vein |
| C. | orifice |
| D. | none of these |
| Answer» C. orifice | |
| 1027. |
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» C. more than | |
| 1028. |
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant) |
| A. | A x M x m^1/2 x i^2/3 |
| B. | A x M x m^2/3 x i^1/2 |
| C. | A^1/2 x M^2/3 x m x i |
| D. | A^2/3 x M^1/3 x m x i |
| Answer» C. A^1/2 x M^2/3 x m x i | |
| 1029. |
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called |
| A. | weir |
| B. | notch |
| C. | orifice |
| D. | none of these |
| Answer» C. orifice | |
| 1030. |
The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid) |
| A. | 4μvl/wd² |
| B. | 8μvl/wd² |
| C. | 16μvl/wd² |
| D. | 32μvl/wd² |
| Answer» E. | |
| 1031. |
If a body floating in a liquid does not return back to its original position, and heels farther "away when given a small angular displacement, the body is said to be in neutral equilibrium. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1032. |
The discharge over a rectangular weir, considering the velocity of approach, is (where H1 = Total height of water above the weir = H + Ha H = Height of water, over the crest of the weir, and Ha = Height of water, due to velocity of approach) |
| A. | Cd x L2g [H1 - Ha] |
| B. | Cd x L2g [H13/2 - Ha3/2] |
| C. | Cd x L2g [H12 - Ha2] |
| D. | Cd x L2g [H15/2 - Ha5/2] |
| Answer» C. Cd x L2g [H12 - Ha2] | |
| 1033. |
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be |
| A. | 2A × √H₁/Cd × a × √(2g) |
| B. | 2A × √H₂/Cd × a × √(2g) |
| C. | 2A × (√H₁ - √H₂)/Cd × a × √(2g) |
| D. | 2A × (√H3/2 - √H3/2)/Cd × a × √(2g) |
| Answer» D. 2A × (√H3/2 - √H3/2)/Cd × a × √(2g) | |
| 1034. |
A point, in a compressible flow where the velocity of fluid is zero, is called |
| A. | critical point |
| B. | vena contracta |
| C. | stagnation point |
| D. | none of these |
| Answer» D. none of these | |
| 1035. |
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called |
| A. | continuity equation |
| B. | Bernoulli's equation |
| C. | Pascal's law |
| D. | Archimede's principle |
| Answer» C. Pascal's law | |
| 1036. |
The shear stress-strain graph for a non-newtonian fluid is a curve. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1037. |
The mercury does not wet the glass. This is due to the property of the liquid known as |
| A. | cohesion |
| B. | adhesion |
| C. | viscosity |
| D. | surface tension |
| Answer» E. | |
| 1038. |
A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1039. |
The property of a liquid which controls its rate of flow is called viscosity. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1040. |
A flow in which the viscosity of fluid is dominating over the inertia force is called |
| A. | steady flow |
| B. | unsteady flow |
| C. | laminar flow |
| D. | turbulent flow |
| Answer» D. turbulent flow | |
| 1041. |
According to Bazin's formula, the discharge over a rectangular weir is mL2g x H^3/2 where m is equal to |
| A. | 0.405 + (0.003/H) |
| B. | 0.003 + (0.405/H) |
| C. | 0.405 + (H/0.003) |
| D. | 0.003 + (H/0.405) |
| Answer» B. 0.003 + (0.405/H) | |
| 1042. |
A body floating in a liquid is said to be not in equilibrium if its metacentre lies below its centre of gravity. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1043. |
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called |
| A. | Pascal's law |
| B. | Archimede's principle |
| C. | principle of floatation |
| D. | Bernoulli's theorem |
| Answer» C. principle of floatation | |
| 1044. |
A flow in which the quantity of liquid flowing per second is not constant, is called |
| A. | streamline flow |
| B. | turbulent flow |
| C. | steady flow |
| D. | unsteady flow |
| Answer» E. | |
| 1045. |
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank. |
| A. | equal to |
| B. | directly proportional |
| C. | inversely proportional |
| D. | None of these |
| Answer» C. inversely proportional | |
| 1046. |
The Francis formula for the discharge over Cippoletti weir is |
| A. | 1.84 LH1/2 |
| B. | 1.84 LH |
| C. | 1.84 LH3/2 |
| D. | 1.84 LH5/2 |
| Answer» D. 1.84 LH5/2 | |
| 1047. |
The specific gravity of water is taken as |
| A. | 0.001 |
| B. | 0.01 |
| C. | 0.1 |
| D. | 1 |
| Answer» E. | |
| 1048. |
The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece) |
| A. | 0.855√(2gH) |
| B. | 1.855 aH.√(2g) |
| C. | 1.585 a.√(2gH) |
| D. | 5.85 aH.√(2g) |
| Answer» D. 5.85 aH.√(2g) | |
| 1049. |
The specific weight is also known as weight density. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1050. |
The ratio of the inertia force to the elastic force is called |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Weber's number |
| D. | Mach number |
| Answer» E. | |