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.
| 1101. |
One poise is equal to |
| A. | 0.1 N-s/m² |
| B. | 1 N-s/m² |
| C. | 10 N-s/m² |
| D. | 100 N-s/m² |
| Answer» B. 1 N-s/m² | |
| 1102. |
The shear stress-strain graph for a newtonian fluid is a |
| A. | straight line |
| B. | parabolic curve |
| C. | hyperbolic curve |
| D. | elliptical |
| Answer» B. parabolic curve | |
| 1103. |
Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow. |
| A. | sum |
| B. | different |
| C. | product |
| D. | ratio |
| Answer» D. ratio | |
| 1104. |
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is |
| A. | v₁²/2g |
| B. | v₂²/2g |
| C. | 0.5 v₁²/2g |
| D. | 0.375 v₂²/2g |
| Answer» E. | |
| 1105. |
When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as |
| A. | centre of pressure |
| B. | centre of gravity |
| C. | centre of buoyancy |
| D. | metacentre |
| Answer» E. | |
| 1106. |
The Newton's law of resistance is based on the assumption that the |
| A. | planes of the body are completely smooth |
| B. | space around the body is completely filled with the fluid |
| C. | fluid particles do not exert any influence on one another |
| D. | all of the above |
| Answer» E. | |
| 1107. |
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be |
| A. | running full |
| B. | running free |
| C. | partially running full |
| D. | partially running free |
| Answer» C. partially running full | |
| 1108. |
A manometer can be used to measure vacuum pressures. |
| A. | Agree |
| B. | disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. disagree | |
| 1109. |
The coefficient of discharge for an external mouthpiece depends upon |
| A. | velocity of liquid |
| B. | pressure of liquid |
| C. | area of mouthpiece |
| D. | length of mouthpiece |
| Answer» E. | |
| 1110. |
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain. |
| A. | equal to |
| B. | directly proportional |
| C. | inversely proportional |
| D. | None of these |
| Answer» C. inversely proportional | |
| 1111. |
A flow through an expanding tube at constant rate is called |
| A. | steady uniform flow |
| B. | steady non-uniform flow |
| C. | unsteady uniform flow |
| D. | unsteady non-uniform flow |
| Answer» C. unsteady uniform flow | |
| 1112. |
In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice. |
| A. | equal to |
| B. | one-fourth |
| C. | one-third |
| D. | one-half |
| Answer» C. one-third | |
| 1113. |
An average value of coefficient of velocity is |
| A. | 0.62 |
| B. | 0.76 |
| C. | 0.84 |
| D. | 0.97 |
| Answer» E. | |
| 1114. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct? |
| A. | The pressure on the wall at the liquid level is minimum. |
| B. | The pressure on the bottom of the wall is maximum. |
| C. | The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum |
| D. | The pressure on the bottom of the wall is zero. |
| Answer» D. The pressure on the bottom of the wall is zero. | |
| 1115. |
The atmospheric pressure at sea level is |
| A. | 103 kN/m² |
| B. | 10.3 m of water |
| C. | 760 mm of mercury |
| D. | all of these |
| Answer» E. | |
| 1116. |
Laminar flow __________ place at very low velocities. |
| A. | takes |
| B. | does not take |
| C. | Can't say |
| D. | None of these |
| Answer» B. does not take | |
| 1117. |
The volume per unit mass of a liquid is called specific volume. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1118. |
When the Mach number is equal to unity, the flow is called sonic flow. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1119. |
The ratio of the inertia force to the surface tension force is called Weber's number. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1120. |
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water. |
| A. | decreases |
| B. | increases |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1121. |
In two dimensional flow, the flow does not take place in a curve. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1122. |
In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | double |
| B. | four times |
| C. | eight times |
| D. | sixteen times |
| Answer» B. four times | |
| 1123. |
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe) |
| A. | flv²/2gd |
| B. | flv²/gd |
| C. | 3flv²/2gd |
| D. | 4flv²/2gd |
| Answer» E. | |
| 1124. |
When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called |
| A. | gauge pressure |
| B. | absolute pressure |
| C. | positive gauge pressure |
| D. | vacuum pressure |
| Answer» D. vacuum pressure | |
| 1125. |
A submerged body is said to be in a stable equilibrium, if its centre of gravity __________ the centre of buoyancy. |
| A. | coincides with |
| B. | lies below |
| C. | lies above |
| D. | None of these |
| Answer» C. lies above | |
| 1126. |
A thick liquid like a syrup has a __________ viscosity than a light liquid like water. |
| A. | lesser |
| B. | greater |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1127. |
The purpose of a surge tank is |
| A. | to control the pressure variations due to rapid changes in the pipe line flow |
| B. | to eliminate water hammer possibilities |
| C. | to regulate flow of water to turbines by providing necessary retarding head of water |
| D. | all of the above |
| Answer» E. | |
| 1128. |
When the Mach number is between __________ the flow is called super-sonic flow. |
| A. | 1 and 2.5 |
| B. | 2.5 and 4 |
| C. | 4 and 6 |
| D. | 1 and 6 |
| Answer» E. | |
| 1129. |
The velocity at which the turbulent flow starts is known as higher critical velocity. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1130. |
A nozzle placed at the end of a water pipe line discharges water at a |
| A. | low pressure |
| B. | high pressure |
| C. | low velocity |
| D. | high velocity |
| Answer» E. | |
| 1131. |
The rise, in water level, which occurs during the transformation of the unstable shooting flow to the stable streaming flow is called hydraulic jump. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1132. |
In order to avoid tendency of separation at throat in a venturimeter, the ratio of the diameter at throat to the diameter of pipe should be |
| A. | 1/16 to 1/8 |
| B. | 1/8 to 1/4 |
| C. | 1/4 to 1/3 |
| D. | 1/3 to 1/2 |
| Answer» E. | |
| 1133. |
The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m³/s). |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1134. |
An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch, |
| A. | 1% |
| B. | 1.5% |
| C. | 2% |
| D. | 2.5% |
| Answer» E. | |
| 1135. |
The dynamic viscosity of gases __________ with rise in temperature. |
| A. | remain unaffected |
| B. | increases |
| C. | decreases |
| D. | None of these |
| Answer» C. decreases | |
| 1136. |
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» C. compressibility of liquid | |
| 1137. |
Bernoulli's equation is applied to |
| A. | venturimeter |
| B. | orifice meter |
| C. | pitot tube |
| D. | all of these |
| Answer» E. | |
| 1138. |
In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir. |
| A. | equal to |
| B. | one-third |
| C. | two-third |
| D. | three-fourth |
| Answer» D. three-fourth | |
| 1139. |
When the flow in an open channel is gradually varied, the flow is said to be |
| A. | steady uniform flow |
| B. | steady non-uniform flow |
| C. | unsteady uniform flow |
| D. | unsteady non-uniform flow |
| Answer» C. unsteady uniform flow | |
| 1140. |
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is |
| A. | 0.417 H^5/2 |
| B. | 1.417 H^5/2 |
| C. | 4.171 H^5/2 |
| D. | 7.141 H^5/2 |
| Answer» C. 4.171 H^5/2 | |
| 1141. |
The depth of water in a channel corresponding to the minimum specific energy is known as critical depth. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1142. |
The hydraulic mean depth or the hydraulic radius is the ratio of |
| A. | area of flow and wetted perimeter |
| B. | wetted perimeter and diameter of pipe |
| C. | velocity of flow and area of flow |
| D. | none of these |
| Answer» B. wetted perimeter and diameter of pipe | |
| 1143. |
A venturiflume is used to measure |
| A. | pressure of liquid |
| B. | discharge of liquid |
| C. | pressure difference between two points in a channel |
| D. | pressure difference between two points in a pipe |
| Answer» C. pressure difference between two points in a channel | |
| 1144. |
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is |
| A. | π w ω² r²/4g |
| B. | π w ω² r³/4g |
| C. | π w ω² r⁴/4g |
| D. | π w ω² r²/2g |
| Answer» B. π w ω² r³/4g | |
| 1145. |
The total pressure on the bottom of a closed cylindrical vessel completely filled up with a liquid is the sum of the total centrifugal pressure and the weight of the liquid in the vessel. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1146. |
The flow in a pipe or channel is said to be non-uniform when |
| A. | the liquid particles at all sections 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» C. the quantity of liquid flowing per second is constant | |
| 1147. |
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel) |
| A. | (q/g)1/2 |
| B. | (q²/g)1/3 |
| C. | (q³/g)1/4 |
| D. | (q⁴/g)1/5 |
| Answer» C. (q³/g)1/4 | |
| 1148. |
The most efficient section of a channel is |
| A. | triangular |
| B. | rectangular |
| C. | square |
| D. | trapezoidal |
| Answer» E. | |
| 1149. |
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» D. Q = Cd × bH × √(2gh) | |
| 1150. |
The viscosity of a liquid __________ its rate of flow through a hole in a vessel. |
| A. | effects |
| B. | does not effect |
| C. | Can't say |
| D. | None of these |
| Answer» B. does not effect | |