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.
| 1151. |
The flow in a pipe is laminar, when Reynold number is less than 2000. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1152. |
The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid) |
| A. | wH/2 |
| B. | wH |
| C. | wH2/2 |
| D. | wH2/4 |
| Answer» D. wH2/4 | |
| 1153. |
In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1154. |
In the manufacturing of lead shots, the property of surface tension is utilised. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1155. |
The total pressure on the top of a closed cylindrical vessel competely filled up with a liquid is |
| A. | directly proportional to (radius)² |
| B. | inversely proportional to (radius)² |
| C. | directly proportional to (radius)⁴ |
| D. | inversely proportional to (radius)⁴ |
| Answer» D. inversely proportional to (radius)⁴ | |
| 1156. |
A flow through an expanding tube at increasing rate is called unsteady non-uniform flow. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1157. |
The unit of dynamic viscosity in S.I. units is |
| A. | N-m/s² |
| B. | N-s/m² |
| C. | poise |
| D. | stoke |
| Answer» C. poise | |
| 1158. |
Kinematic viscosity is the product of dynamic viscosity and the density of the liquid. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1159. |
An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice. |
| A. | free |
| B. | partially |
| C. | full |
| D. | None of these |
| Answer» D. None of these | |
| 1160. |
A notch is, usually, made of a metallic plate. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1161. |
The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid) |
| A. | K.ρ |
| B. | K/ρ |
| C. | ρ/K |
| D. | K.ρ |
| Answer» C. ρ/K | |
| 1162. |
The specific weight of compressible fluids does not remain constant. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1163. |
When the Mach number is less than unity, the flow is called |
| A. | sub-sonic flow |
| B. | sonic flow |
| C. | super-sonic flow |
| D. | hyper-sonic flow |
| Answer» B. sonic flow | |
| 1164. |
The highest efficiency is obtained with a channel of __________ section. |
| A. | circular |
| B. | square |
| C. | rectangular |
| D. | trapezoidal |
| Answer» E. | |
| 1165. |
The body will float if the force of buoyancy is __________ the weight of the liquid displaced. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» D. None of these | |
| 1166. |
The ratio of the inertia force to the __________ is called Euler's number. |
| A. | pressure force |
| B. | elastic force |
| C. | surface tension force |
| D. | viscous force |
| Answer» B. elastic force | |
| 1167. |
A fluid having no viscosity is known as |
| A. | real fluid |
| B. | ideal fluid |
| C. | newtonian fluid |
| D. | non-newtonian fluid |
| Answer» C. newtonian fluid | |
| 1168. |
A fluid whose viscosity does not change with the rate of deformation or shear strain is known as |
| A. | real fluid |
| B. | ideal fluid |
| C. | newtonian fluid |
| D. | non-newtonian fluid |
| Answer» D. non-newtonian fluid | |
| 1169. |
The reciprocal of Euler's number is called Newton number. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1170. |
The vacuum pressure can be measured with the help of a piezometer tube. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1171. |
The flow of water through the hole in the bottom of a wash basin is an example of |
| A. | steady flow |
| B. | uniform flow |
| C. | free vortex |
| D. | forced vortex |
| Answer» D. forced vortex | |
| 1172. |
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions) |
| A. | Cd(L - nH)2gH |
| B. | Cd(L - 0.1nH)2gH^3/2 |
| C. | Cd(L - nH)2gH^2 |
| D. | Cd(L - 0.2nH)2gH^5/2 |
| Answer» C. Cd(L - nH)2gH^2 | |
| 1173. |
One stoke is equal to |
| A. | 10¯² m²/s |
| B. | 10¯³ m²/s |
| C. | 10¯⁴ m²/s |
| D. | 10¯⁶ m²/s |
| Answer» D. 10¯⁶ m²/s | |
| 1174. |
The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1175. |
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film) |
| A. | μπ²NR/60t |
| B. | μπ²NR²/60t |
| C. | μπ²NR³/60t |
| D. | μπ²NR⁴/60t |
| Answer» E. | |
| 1176. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface. |
| A. | H/3 |
| B. | H/2 |
| C. | 2H/3 |
| D. | 3H/4 |
| Answer» D. 3H/4 | |
| 1177. |
The length of a liquid stream while flowing over a weir __________ at the ends of the sill. |
| A. | expands |
| B. | does not change |
| C. | contracts |
| D. | None of these |
| Answer» D. None of these | |
| 1178. |
The metacentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is |
| A. | 4.1 s |
| B. | 5.2 s |
| C. | 10.4 s |
| D. | 14.1 s |
| Answer» D. 14.1 s | |
| 1179. |
The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is |
| A. | 0.0116 stoke |
| B. | 0.116 stoke |
| C. | 0.0611 stoke |
| D. | 0.611 stoke |
| Answer» B. 0.116 stoke | |
| 1180. |
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is |
| A. | 1.84(L - 0.1nH)^H3/2 |
| B. | 1.84(L - nH)H^2 |
| C. | 1.84(L - 0.1nH)H^5/2 |
| D. | 1.84(L - nH)H^3 |
| Answer» B. 1.84(L - nH)H^2 | |
| 1181. |
The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head. |
| A. | one-half |
| B. | one-third |
| C. | two-third |
| D. | None of these |
| Answer» C. two-third | |
| 1182. |
The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as buoyancy. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1183. |
The velocity of liquid flowing through an orifice varies with the available head of the liquid. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1184. |
According to Bazin, the coefficient of discharge varies with the height of water over the sill of a weir. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1185. |
The metacentric height is the distance between the |
| A. | centre of gravity of the floating body and the centre of buoyancy |
| B. | centre of gravity of the floating body and the metacentre |
| C. | metacentre and centre of buoyancy |
| D. | original centre of buoyancy and new centre of buoyancy |
| Answer» C. metacentre and centre of buoyancy | |
| 1186. |
If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1187. |
A nozzle is generally made of |
| A. | cylindrical shape |
| B. | convergent shape |
| C. | divergent shape |
| D. | convergent-divergent shape |
| Answer» C. divergent shape | |
| 1188. |
If the depth of water in an open channel is greater than the critical depth, the flow is called |
| A. | critical flow |
| B. | turbulent flow |
| C. | tranquil flow |
| D. | torrential flow |
| Answer» D. torrential flow | |
| 1189. |
With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will |
| A. | decrease |
| B. | increase |
| C. | remain unchanged |
| D. | depend upon the characteristics of liquid |
| Answer» B. increase | |
| 1190. |
A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called |
| A. | steady flow |
| B. | uniform flow |
| C. | streamline flow |
| D. | turbulent flow |
| Answer» D. turbulent flow | |
| 1191. |
The intensity of pressure at any point, in a liquid, is |
| A. | directly proportional to the area of the vessel containing liquid |
| B. | directly proportional to the depth of liquid from the surface |
| C. | directly proportional to the length of the vessel containing liquid |
| D. | inversely proportional to the depth of liquid from the surface |
| Answer» C. directly proportional to the length of the vessel containing liquid | |
| 1192. |
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» B. more | |
| 1193. |
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as |
| A. | steady flow |
| B. | turbulent flow |
| C. | vortex flow |
| D. | uniform flow |
| Answer» D. uniform flow | |
| 1194. |
The rise of liquid along the walls of a revolving cylinder about the initial level is __________ the depression of the liquid at the axis of rotation. |
| A. | same as |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» B. less than | |
| 1195. |
When the pipes are in series, the total head loss is equal to the sum of the head loss in each pipe. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1196. |
In a lockgate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock) |
| A. | p/sinα |
| B. | 2p/sinα |
| C. | P / 2sinα |
| D. | p/sin (α/2) |
| Answer» D. p/sin (α/2) | |
| 1197. |
According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1198. |
The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface. |
| A. | equal |
| B. | directly proportional |
| C. | inversely proportional |
| D. | None of these |
| Answer» C. inversely proportional | |
| 1199. |
If a pitot tube is placed with its nose upstream, downstream or sideways, the reading will be the same in every case. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1200. |
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece) |
| A. | 0.5 √2gH |
| B. | 0.707 a. √2gH |
| C. | 0.855 a. √2gH |
| D. | a. √2gH |
| Answer» B. 0.707 a. √2gH | |