MCQOPTIONS
Saved Bookmarks
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.
| 1051. |
The velocity corresponding to Reynold number of 2000 is called |
| A. | sub-sonic velocity |
| B. | super-sonic velocity |
| C. | lower critical velocity |
| D. | higher critical velocity |
| Answer» D. higher critical velocity | |
| 1052. |
The force of buoyancy is always __________ the weight of the liquid displaced by the body. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» B. less than | |
| 1053. |
The volume of a fluid __________ as the pressure increases. |
| A. | remains same |
| B. | decreases |
| C. | increases |
| D. | None of these |
| Answer» C. increases | |
| 1054. |
Surface tension force is the product of surface tension per unit length and cross-sectional area of flow. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1055. |
A notch is used to measure __________ of liquids. |
| A. | pressure |
| B. | discharge |
| C. | velocity |
| D. | volume |
| Answer» C. velocity | |
| 1056. |
The dynamic viscosity of the liquid __________ with rise in temperature. |
| A. | remain unaffected |
| B. | increases |
| C. | decreases |
| D. | None of these |
| Answer» D. None of these | |
| 1057. |
The Cippoletti weir is a __________ weir. |
| A. | rectangular |
| B. | triangular |
| C. | trapezoidal |
| D. | circular |
| Answer» D. circular | |
| 1058. |
A flow through a long pipe at decreasing rate is called __________ uniform flow. |
| A. | steady |
| B. | unsteady |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1059. |
Poise is the unit of viscosity in C.G.S. system of units. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1060. |
When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1061. |
The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water. |
| A. | equal to |
| B. | one-half |
| C. | three fourth |
| D. | double |
| Answer» E. | |
| 1062. |
The density of air is same at different heights. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1063. |
The magnitude of water hammer depends upon the |
| A. | elastic properties of the pipe material |
| B. | elastic properties of the liquid flowing through the pipe |
| C. | speed at which the valve is closed |
| D. | all of the above |
| Answer» E. | |
| 1064. |
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» C. 9.28 kN | |
| 1065. |
When a body is placed over a liquid, it will sink down if |
| A. | gravitational force is equal to the upthrust of the liquid |
| B. | gravitational force is less than the upthrust of the liquid |
| C. | gravitational force is more than the upthrust of the liquid |
| D. | none of the above |
| Answer» D. none of the above | |
| 1066. |
The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe) |
| A. | (H - hf )/H |
| B. | H/(H - hf ) |
| C. | (H + hf )/H |
| D. | H/(H + hf ) |
| Answer» B. H/(H - hf ) | |
| 1067. |
The mass of 2.5 m³ of a certain liquid is 2 tonnes. Its mass density is |
| A. | 200 kg/m³ |
| B. | 400 kg/m³ |
| C. | 600 kg/m³ |
| D. | 800 kg/m³ |
| Answer» E. | |
| 1068. |
The flow in a pipe or channel is said to be uniform when |
| A. | the liquid particles at all sectons 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 | |
| 1069. |
An air vessel is provided at the summit in a syphon to |
| A. | avoid interruption in the flow |
| B. | increase discharge |
| C. | increase velocity |
| D. | maintain pressure difference |
| Answer» B. increase discharge | |
| 1070. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by |
| A. | dQ/Q = (1/2) × (dH/H) |
| B. | dQ/Q = (3/4) × (dH/H) |
| C. | dQ/Q = (dH/H) |
| D. | dQ/Q = (3/2) × (dH/H) |
| Answer» E. | |
| 1071. |
The specific weight of water in S.I. units is taken as |
| A. | 9.81 kN/m³ |
| B. | 9.81 x 103 kN/m³ |
| C. | 9.81 x 10-6 N/mm³ |
| D. | any one of these |
| Answer» E. | |
| 1072. |
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» D. None of these | |
| 1073. |
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» B. 25.3 m | |
| 1074. |
The discharge over a rectangular notch is |
| A. | inversely proportional to H^3/2 |
| B. | directly proportional to H^3/2 |
| C. | inversely proportional to H^5/2 |
| D. | directly proportional to H^5/2 |
| Answer» C. inversely proportional to H^5/2 | |
| 1075. |
The hydraulic mean depth for a circular pipe of diameter (d) is |
| A. | d/6 |
| B. | d/4 |
| C. | d/2 |
| D. | d |
| Answer» C. d/2 | |
| 1076. |
When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface. |
| A. | concave |
| B. | convex |
| C. | Can't say |
| D. | None of these |
| Answer» B. convex | |
| 1077. |
In a sharp-crested weir, the thickness of the weir is kept less than half of the height of water above the crest of the weir. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1078. |
According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed) |
| A. | A m x i |
| B. | C m x i |
| C. | AC m x i |
| D. | mi A x C |
| Answer» D. mi A x C | |
| 1079. |
The line of action of the force of buoyancy acts through the centre of gravity of the volume of the liquid displaced. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1080. |
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre |
| A. | coincides with its centre of gravity |
| B. | lies above its centre of gravity |
| C. | lies below its centre of gravity |
| D. | lies between the centre of buoyancy and centre of gravity |
| Answer» B. lies above its centre of gravity | |
| 1081. |
According to Bernoulli's equation |
| A. | Z + p/w + v²/2g = constant |
| B. | Z + p/w - v²/2g = constant |
| C. | Z - p/w + v²/2g = constant |
| D. | Z - p/w - v²/2g = constant |
| Answer» B. Z + p/w - v²/2g = constant | |
| 1082. |
Turbulent flow takes place at high velocities. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1083. |
When a liquid is flowing through a pipe, the velocity of the liquid is |
| A. | maximum at the centre and minimum near the walls |
| B. | minimum at the centre and maximum near the walls |
| C. | zero at the centre and maximum near the walls |
| D. | maximum at the centre and zero near the walls |
| Answer» B. minimum at the centre and maximum near the walls | |
| 1084. |
The velocity of the liquid flowing through the divergent portion of a venturimeter |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | depends upon mass of liquid |
| Answer» D. depends upon mass of liquid | |
| 1085. |
The hydraulic gradient line may be above or below the centre line of the pipe. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1086. |
The factional resistance of a pipe varies approximately with __________ of the liquid. |
| A. | pressure |
| B. | velocity |
| C. | square of velocity |
| D. | cube of velocity |
| Answer» D. cube of velocity | |
| 1087. |
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance) |
| A. | Cc x Cv |
| B. | Cc x Cr |
| C. | Cv x Cr |
| D. | Cc/Cr |
| Answer» B. Cc x Cr | |
| 1088. |
The buoyancy depends upon the |
| A. | weight of the liquid displaced |
| B. | pressure with which the liquid is displaced |
| C. | viscosity of the liquid |
| D. | compressibility of the liquid |
| Answer» B. pressure with which the liquid is displaced | |
| 1089. |
When a body is placed over a liquid, it will float if |
| A. | gravitational force is equal to the upthrust of the liquid |
| B. | gravitational force is less than the upthrust of the liquid |
| C. | gravitational force is more than the upthrust of the liquid |
| D. | none of the above |
| Answer» B. gravitational force is less than the upthrust of the liquid | |
| 1090. |
A weir, generally, used as a spillway of a dam is |
| A. | narrow crested weir |
| B. | broad crested weir |
| C. | Ogee weir |
| D. | submerged weir |
| Answer» D. submerged weir | |
| 1091. |
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is |
| A. | 0.46 |
| B. | 0.64 |
| C. | 0.78 |
| D. | 0.87 |
| Answer» C. 0.78 | |
| 1092. |
The viscosity of water is __________ than that of mercury. |
| A. | higher |
| B. | lower |
| C. | Can't say |
| D. | None of these |
| Answer» B. lower | |
| 1093. |
The Euler's equation for the motion of liquids is based upon the assumption that |
| A. | the fluid is non - viscous, homogeneous and incompressible |
| B. | the velocity of flow is uniform over the section |
| C. | the flow is continuous, steady and along the stream line |
| D. | all of the above |
| Answer» E. | |
| 1094. |
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension) |
| A. | 4wd/σ cosα |
| B. | σ cosα/4wd |
| C. | 4σ cosα/wd |
| D. | wd/4σ cosα |
| Answer» D. wd/4σ cosα | |
| 1095. |
An orifice is said to be large, if |
| A. | the size of orifice is large |
| B. | the velocity of flow is large |
| C. | the available head of liquid is more than 5 times the height of orifice |
| D. | the available head of liquid is less than 5 times the height of orifice |
| Answer» E. | |
| 1096. |
The velocity at which the flow changes from laminar flow to turbulent flow is called |
| A. | critical velocity |
| B. | velocity of approach |
| C. | sub-sonic velocity |
| D. | super-sonic velocity |
| Answer» B. velocity of approach | |
| 1097. |
The pressure of fluid due to hammer blow is |
| A. | directly proportional to density of fluid |
| B. | inversely proportional to density of fluid |
| C. | directly proportional to (density)1/2 of fluid |
| D. | inversely proportional to (density)1/2 of fluid |
| Answer» D. inversely proportional to (density)1/2 of fluid | |
| 1098. |
The velocity corresponding to Reynold number of 2800, is called |
| A. | sub-sonic velocity |
| B. | super-sonic velocity |
| C. | lower critical velocity |
| D. | higher critical velocity |
| Answer» E. | |
| 1099. |
A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1100. |
Reynold's number is the ratio of inertia force to |
| A. | pressure force |
| B. | elastic force |
| C. | gravity force |
| D. | viscous force |
| Answer» E. | |