McqMate
Chapters
| 101. |
Select the correct statement |
| A. | Local atmospheric pressure depends upon elevation of locality only |
| B. | Standard atmospheric pressure is the mean local atmospheric pressure a* sea level |
| C. | Local atmospheric pressure is always below standard atmospheric pressure |
| D. | A barometer reads the difference between local and standard atmospheric pressure |
| Answer» B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level | |
| 102. |
The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» D. Turbulent flow | |
| 103. |
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» C. More than | |
| 104. |
Which of the following instruments is used to measure flow on the application of Bernoulli's theorem? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Nozzle |
| D. | All of the above |
| Answer» D. All of the above | |
| 105. |
An ideal flow of any fluid must satisfy |
| A. | Pascal law |
| B. | Newton's law of viscosity |
| C. | Boundary layer theory |
| D. | Continuity equation |
| Answer» D. Continuity equation | |
| 106. |
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» A. 15.3 m | |
| 107. |
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called |
| A. | Density of liquid |
| B. | Specific gravity of liquid |
| C. | Compressibility of liquid |
| D. | Surface tension of liquid |
| Answer» B. Specific gravity of liquid | |
| 108. |
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to |
| A. | 10 kg |
| B. | 100 kg |
| C. | 1000 kg |
| D. | 1 kg |
| Answer» A. 10 kg | |
| 109. |
The total head of a liquid particle in motion is equal to |
| A. | Pressure head + kinetic head + potential head |
| B. | Pressure head - (kinetic head + potential head) |
| C. | Potential head - (pressure head + kinetic head) |
| D. | Kinetic head - (pressure head + potential head) |
| Answer» A. Pressure head + kinetic head + potential head | |
| 110. |
When the Venturimeter is inclined, then for a given flow it will show __________ reading. |
| A. | Same |
| B. | More |
| C. | Less |
| D. | None of these |
| Answer» A. Same | |
| 111. |
Cavitation is caused by |
| A. | High velocity |
| B. | High pressure |
| C. | Weak material |
| D. | Low pressure |
| Answer» D. Low pressure | |
| 112. |
An ideal flow of any fluid must fulfill the following |
| A. | Newton's law of motion |
| B. | Newton's law of viscosity |
| C. | Pascal' law |
| D. | Continuity equation |
| Answer» D. Continuity equation | |
| 113. |
Surface tension |
| A. | Acts in the plane of the interface normal to any line in the surface |
| B. | Is also known as capillarity |
| C. | Is a function of the curvature of the interface |
| D. | Decreases with fall in temperature |
| Answer» A. Acts in the plane of the interface normal to any line in the surface | |
| 114. |
Alcohol is used in manometers because |
| A. | It has low vapour pressure |
| B. | It is clearly visible |
| C. | It has low surface tension |
| D. | It can provide longer column due to low density |
| Answer» D. It can provide longer column due to low density | |
| 115. |
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice) |
| A. | Q = Cd × bH₁ × √(2gh) |
| B. | Q = Cd × bH2 × √(2gh) |
| C. | Q = Cd × b (H2 - H1) × √(2gh) |
| D. | Q = Cd × bH × √(2gh) |
| Answer» C. Q = Cd × b (H2 - H1) × √(2gh) | |
| 116. |
If no resistance is encountered by displacement, such a substance is known as |
| A. | Fluid |
| B. | Water |
| C. | Gas |
| D. | Ideal fluid |
| Answer» D. Ideal fluid | |
| 117. |
The kinematic viscosity is the |
| A. | Ratio of absolute viscosity to the density of the liquid |
| B. | Ratio of density of the liquid to the absolute viscosity |
| C. | Product of absolute viscosity and density of the liquid |
| D. | Product of absolute viscosity and mass of the liquid |
| Answer» A. Ratio of absolute viscosity to the density of the liquid | |
| 118. |
Choose the correct relationship |
| A. | Specific gravity = gravity × density |
| B. | Dynamic viscosity = kinematic viscosity × density |
| C. | Gravity = specific gravity × density |
| D. | Kinematic viscosity = dynamic viscosity × density |
| Answer» B. Dynamic viscosity = kinematic viscosity × density | |
| 119. |
The viscosity of water is __________ than that of mercury. |
| A. | Higher |
| B. | Lower |
| C. | Same as |
| D. | None of these |
| Answer» A. Higher | |
| 120. |
Surface energy per unit area of a surface is numerically equal to |
| A. | Atmospheric pressure |
| B. | Surface tension |
| C. | Force of adhesion |
| D. | Force of cohesion |
| Answer» B. Surface tension | |
| 121. |
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the |
| A. | Force of adhesion |
| B. | Force of cohesion |
| C. | Force of friction |
| D. | Force of diffusion |
| Answer» B. Force of cohesion | |
| 122. |
Which of the following statement is correct? |
| A. | In a compressible flow, the volume of the flowing liquid changes during the flow |
| B. | A flow, in which the volume of the flowing liquid does not change, is called incompressible flow |
| C. | When the particles rotate about their own axes while flowing, the flow is said to be rotational flow |
| D. | All of the above |
| Answer» D. All of the above | |
| 123. |
Choose the wrong statement |
| A. | Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force |
| B. | Viscosity is due primarily to interaction between fluid molecules |
| C. | Viscosity of liquids decreases with increase in temperature |
| D. | Viscosity of liquids is appreciably affected by change in pressure |
| Answer» D. Viscosity of liquids is appreciably affected by change in pressure | |
| 124. |
The unit of dynamic viscosity in S.I. units is |
| A. | N-m/s2 |
| B. | N-s/m2 |
| C. | Poise |
| D. | Stoke |
| Answer» B. N-s/m2 | |
| 125. |
A perfect gas |
| A. | Has constant viscosity |
| B. | Has zero viscosity |
| C. | Is in compressible |
| D. | None of the above |
| Answer» D. None of the above | |
| 126. |
In a static fluid |
| A. | Resistance to shear stress is small |
| B. | Fluid pressure is zero |
| C. | Linear deformation is small |
| D. | Only normal stresses can exist |
| Answer» D. Only normal stresses can exist | |
| 127. |
One liter of water occupies a volume of |
| A. | 100 cm3 |
| B. | 250 cm3 |
| C. | 500 cm3 |
| D. | 1000 cm3 |
| Answer» D. 1000 cm3 | |
| 128. |
The maximum discharge over a broad crested weir is |
| A. | 0.384 Cd × L × H1/2 |
| B. | 0.384 Cd × L × H3/2 |
| C. | 1.71 Cd × L × H1/2 |
| D. | 1.71 Cd × L × H3/2 |
| Answer» D. 1.71 Cd × L × H3/2 | |
| 129. |
The ratio of absolute viscosity to mass density is known as |
| A. | Specific viscosity |
| B. | Viscosity index |
| C. | Kinematic viscosity |
| D. | Coefficient of viscosity |
| Answer» C. Kinematic viscosity | |
| 130. |
Hot wire anemometer is used to measure |
| A. | Pressure in gases |
| B. | Liquid discharge |
| C. | Pressure in liquids |
| D. | Gas velocities |
| Answer» D. Gas velocities | |
| 131. |
Venturimeter is used to |
| A. | Measure the velocity of a flowing liquid |
| B. | Measure the pressure of a flowing liquid |
| C. | Measure the discharge of liquid flowing in a pipe |
| D. | Measure the pressure difference of liquid flowing between two points in a pipe line |
| Answer» C. Measure the discharge of liquid flowing in a pipe | |
| 132. |
The pressure measured with the help of a pressure gauge is called |
| A. | Atmospheric pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | Mean pressure |
| Answer» B. Gauge pressure | |
| 133. |
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 'θ'. Sensitivity of inclined tube to sensitivity of U-tube is equal to |
| A. | Sinθ |
| B. | 1/Sinθ |
| C. | Cos θ |
| D. | 1/Cosθ |
| Answer» B. 1/Sinθ | |
| 134. |
Capillary action is due to the |
| A. | Surface tension |
| B. | Cohesion of the liquid |
| C. | Adhesion of the liquid molecules and the molecules on the surface of a solid |
| D. | All of the above |
| Answer» D. All of the above | |
| 135. |
The intensity of pressure on an immersed surface __________ with the increase in depth. |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» B. Increases | |
| 136. |
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» A. Kinematic viscosity in C. G. S. units | |
| 137. |
The vapour pressure over the concave surface is |
| A. | Less man the vapour pressure over the plane surface |
| B. | Equal to the vapour pressure over the plane surface |
| C. | Greater than the vapour pressure over the plane surface |
| D. | Zero |
| Answer» A. Less man the vapour pressure over the plane surface | |
| 138. |
Mercury is often used in barometer because |
| A. | It is the best liquid |
| B. | The height of barometer will be less |
| C. | Its vapour pressure is so low that it may be neglected |
| D. | Both (B) and (C) |
| Answer» D. Both (B) and (C) | |
| 139. |
Gradually varied flow is |
| A. | Steady uniform |
| B. | Non-steady non-uniform |
| C. | Non-steady uniform |
| D. | Steady non-uniform |
| Answer» D. Steady non-uniform | |
| 140. |
The viscosity of water at 20°C is |
| A. | One stoke |
| B. | One centistoke |
| C. | One poise |
| D. | One centipoise |
| Answer» D. One centipoise | |
| 141. |
According to Bernoulli's equation for steady ideal fluid flow |
| A. | Principle of conservation of mass holds |
| B. | Velocity and pressure are inversely proportional |
| C. | Total energy is constant throughout |
| D. | The energy is constant along a streamline but may vary across streamlines |
| Answer» D. The energy is constant along a streamline but may vary across streamlines | |
| 142. |
Bernoulli equation deals with the law of conservation of |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | Work |
| Answer» C. Energy | |
| 143. |
If the surface of liquid is convex, men |
| A. | Cohesion pressure is negligible |
| B. | Cohesion pressure is decreased |
| C. | Cohesion pressure is increased |
| D. | There is no cohesion pressure |
| Answer» C. Cohesion pressure is increased | |
| 144. |
The atmospheric pressure with rise in altitude decreases |
| A. | Linearly |
| B. | First slowly and then steeply |
| C. | First steeply and then gradually |
| D. | Unpredictable |
| Answer» B. First slowly and then steeply | |
| 145. |
Dynamic viscosity of most of the gases with rise in temperature |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Unpredictable |
| Answer» A. Increases | |
| 146. |
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» A. Z + p/w + v²/2g = constant | |
| 147. |
For a body floating in a liquid the normal pressure exerted by the liquid acts at |
| A. | Bottom surface of the body |
| B. | C.G. of the body |
| C. | Metacenter |
| D. | All points on the surface of the body |
| Answer» D. All points on the surface of the body | |
| 148. |
Newton's law of viscosity is a relationship between |
| A. | Pressure, velocity and temperature |
| B. | Shear stress and rate of shear strain |
| C. | Shear stress and velocity |
| D. | Rate of shear strain and temperature |
| Answer» B. Shear stress and rate of shear strain | |
| 149. |
A fluid in equilibrium can't sustain |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» C. Shear stress | |
| 150. |
Liquids |
| A. | Cannot be compressed |
| B. | Occupy definite volume |
| C. | Are not affected by change in pressure and temperature |
| D. | None of the above |
| Answer» D. None of the above | |
| 151. |
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of |
| A. | A triangle |
| B. | A paraboloid |
| C. | An ellipse |
| D. | None of these |
| Answer» B. A paraboloid | |
| 152. |
Fluid is a substance that |
| A. | Cannot be subjected to shear forces |
| B. | Always expands until it fills any container |
| C. | Has the same shear stress at a point regardless of its motion |
| D. | Cannot remain at rest under action of any shear force |
| Answer» D. Cannot remain at rest under action of any shear force | |
| 153. |
The property of a fluid which enables it to resist tensile stress is known as |
| A. | Compressibility |
| B. | Surface tension |
| C. | Cohesion |
| D. | Adhesion |
| Answer» C. Cohesion | |
| 154. |
The surface tension of mercury at normal temperature compared to that of water is |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less depending on size of glass tube |
| Answer» A. More | |
| 155. |
The unit of viscosity is |
| A. | Meters² per sec |
| B. | kg-sec/meter |
| C. | Newton-sec per meter² |
| D. | Newton-sec per meter |
| Answer» B. kg-sec/meter | |
| 156. |
Choose the wrong statement. Alcohol is used in manometer, because |
| A. | Its vapour pressure is low |
| B. | It provides suitable meniscus for the inclined tube |
| C. | Its density is less |
| D. | It provides longer length for a given pressure difference |
| Answer» A. Its vapour pressure is low | |
| 157. |
A fluid which obeys the Newton's law of viscosity is termed as |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» C. Newtonian fluid | |
| 158. |
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than |
| A. | Frictional force |
| B. | Viscosity |
| C. | Surface friction |
| D. | All of the above |
| Answer» D. All of the above | |
| 159. |
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water. |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Increases | |
| 160. |
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be |
| A. | Higher than the surface of liquid |
| B. | The same as the surface of liquid |
| C. | Lower than the surface of liquid |
| D. | Unpredictable |
| Answer» C. Lower than the surface of liquid | |
| 161. |
A one dimensional flow is one which |
| A. | Is uniform flow |
| B. | Is steady uniform flow |
| C. | Takes place in straight lines |
| D. | Involves zero transverse component of flow |
| Answer» D. Involves zero transverse component of flow | |
| 162. |
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant) |
| A. | A × M × m1/2 × i2/3 |
| B. | A × M × m2/3 × i1/2 |
| C. | A1/2 × M2/3 × m × i |
| D. | A2/3 × M1/3 × m × i |
| Answer» B. A × M × m2/3 × i1/2 | |
| 163. |
The property of fluid by virtue of which it offers resistance to shear is called |
| A. | Surface tension |
| B. | Adhesion |
| C. | Adhesion |
| D. | Viscosity |
| Answer» D. Viscosity | |
| 164. |
Coefficient of velocity is defined as the ratio of |
| A. | Actual velocity of jet at vena contracta to the theoretical velocity |
| B. | Area of jet at vena contracta to the area of orifice |
| C. | Actual discharge through an orifice to the theoretical discharge |
| D. | None of the above |
| Answer» A. Actual velocity of jet at vena contracta to the theoretical velocity | |
| 165. |
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is |
| A. | 400 kg/cm² |
| B. | 4000 kg/cm² |
| C. | 40 × 10⁵ kg/cm² |
| D. | 40 × 10⁶ kg/cm² |
| Answer» B. 4000 kg/cm² | |
| 166. |
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» D. 800 kg/m3 | |
| 167. |
Free surface of a liquid tends to contract to the smallest possible area due to force of |
| A. | Surface tension |
| B. | Viscosity |
| C. | Friction |
| D. | Cohesion |
| Answer» A. Surface tension | |
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