MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A fluid in equilibrium can’t sustain |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | bending stress |
| Answer» D. bending stress | |
| 2. |
The pressure at the summit of a syphon is |
| A. | equal to atmospheric |
| B. | less than atmospheric |
| C. | more than atmospheric |
| D. | none of the above |
| Answer» C. more than atmospheric | |
| 3. |
The viscosity of a gas |
| A. | decreases with increase in temperature |
| B. | increases with increase in temperature |
| C. | is independent of temperature |
| D. | is independent of pressure for very high pressure intensities |
| Answer» C. is independent of temperature | |
| 4. |
Which of the following velocity potentials satisfies continuity equation ? |
| A. | x2y |
| B. | x2-y2 |
| C. | cosx |
| D. | x2 + y2 |
| Answer» C. cosx | |
| 5. |
Stream lines and path lines always coincide in case of |
| A. | steady flow |
| B. | laminar flow |
| C. | uniform flow |
| D. | turbulent flow |
| Answer» B. laminar flow | |
| 6. |
A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be |
| A. | less than 1 m/sec |
| B. | 1 m/sec |
| C. | 1.5 m/sec |
| D. | 2 m/sec |
| Answer» C. 1.5 m/sec | |
| 7. |
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately |
| A. | 5 mm |
| B. | 10 mm |
| C. | 20 mm |
| D. | 30 mm |
| Answer» E. | |
| 8. |
The motion of air mass in a tornado is a |
| A. | free vortex motion |
| B. | forced vortex motion |
| C. | free vortex at center and forced vortex outside |
| D. | forced vortex at center and free vortex outside |
| Answer» E. | |
| 9. |
In series-pipe problems |
| A. | the head loss is same through each pipe |
| B. | the discharge is same through each pipe |
| C. | a trial solution is not necessary |
| D. | the discharge through each pipe is added to obtain total discharge |
| Answer» C. a trial solution is not necessary | |
| 10. |
The discharge of a liquid of kinematic viscosity 4 cm²/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is |
| A. | laminar flow |
| B. | transition flow |
| C. | turbulent flow |
| D. | not predictable from the given data |
| Answer» B. transition flow | |
| 11. |
The theoretical value of coefficient of contraction of a sharp edged orifice is |
| A. | 0.611 |
| B. | 0.85 |
| C. | 0.98 |
| D. | 1.00 |
| Answer» B. 0.85 | |
| 12. |
Metacentric height is given as the distance between |
| A. | the center of gravity of the body andthe meta center |
| B. | the center of gravity of the body and the center of buoyancy |
| C. | the center of gravity of the body and the center of pressure |
| D. | center of buoyancy and metacentre |
| Answer» B. the center of gravity of the body and the center of buoyancy | |
| 13. |
Thee horizontal component of buoyant force is |
| A. | negligible |
| B. | same as buoyant force |
| C. | zero |
| D. | none of the above |
| Answer» D. none of the above | |
| 14. |
The time oscillation of a floating body with increase in metacentric height will be |
| A. | same |
| B. | higher |
| C. | lower |
| D. | lower/higher depending on weight of body |
| Answer» D. lower/higher depending on weight of body | |
| 15. |
A metal with specific gravity of o floating in a fluid of same specific gravity a will |
| A. | sink to bottom |
| B. | float over fluid |
| C. | partly immersed |
| D. | be fully immersed with top surface at fluid surface |
| Answer» E. | |
| 16. |
If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will |
| A. | rise until its weight equals the buoyant force |
| B. | tend to move downward and it may finally sink |
| C. | float |
| D. | none of the above |
| Answer» C. float | |
| 17. |
The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is |
| A. | 32 km |
| B. | 20 km |
| C. | 8 km |
| D. | 4 km |
| Answer» B. 20 km | |
| 18. |
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow) |
| A. | 0.423 D |
| B. | 0.577 D |
| C. | 0.223 D |
| D. | 0.707 D |
| Answer» C. 0.223 D | |
| 19. |
All the terms of energy in Bernoulli’s equation have dimension of |
| A. | energy |
| B. | work |
| C. | mass |
| D. | length |
| Answer» E. | |
| 20. |
If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be |
| A. | h |
| B. | wh |
| C. | w/h |
| D. | h/w |
| Answer» C. w/h | |
| 21. |
The velocity distribution for laminar flow through a circular tube |
| A. | is constant over the cross-section |
| B. | varies linearly from zero at walls to maximum at centre |
| C. | varies parabolically with maximum at the centre |
| D. | none of the above |
| Answer» D. none of the above | |
| 22. |
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is |
| A. | d > m > e |
| B. | d > e > m |
| C. | e > m > d |
| D. | e > d > m |
| Answer» E. | |
| 23. |
Which of the following manometer has highest sensitivity |
| A. | U-tube with water |
| B. | inclined U-tube |
| C. | U-tube with mercury |
| D. | micro-manometer with water |
| Answer» E. | |
| 24. |
The major loss of energy in long pipes is due to |
| A. | sudden enlargement |
| B. | sudden contraction |
| C. | gradual contraction or enlargement |
| D. | friction |
| Answer» E. | |
| 25. |
Centre of buoyancy always |
| A. | coincides with the centre of gravity |
| B. | coincides with the centroid of the volume of fluid displaced |
| C. | remains above the centre of gravity |
| D. | remains below the centre of gravity |
| Answer» C. remains above the centre of gravity | |
| 26. |
The stress-strain relation of the newtoneon fluid is |
| A. | linear |
| B. | parabolic |
| C. | hyperbolic |
| D. | inverse type |
| Answer» B. parabolic | |
| 27. |
Equation of continuity is based on the principle of conservation of |
| A. | mass |
| B. | energy |
| C. | momentum |
| D. | none of the above |
| Answer» B. energy | |
| 28. |
To avoid an interruption in the flow of a syphon, an air vessel is provided |
| A. | at the inlet |
| B. | at the outlet |
| C. | at the summit |
| D. | ay nay point between inlet and outlet |
| Answer» D. ay nay point between inlet and outlet | |
| 29. |
In an immersed body, center of pressure is |
| A. | at the center of gravity |
| B. | above the center of gravity |
| C. | below be center of gravity |
| D. | could be above or below e.g. depending on density of body and liquid |
| Answer» D. could be above or below e.g. depending on density of body and liquid | |
| 30. |
If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then |
| A. | the pressure throughout the liquid mass is atmospheric |
| B. | there will be vacuum in the liquid |
| C. | the pressure in the liquid mass is greater than hydrostatic pressure |
| D. | none of the above |
| Answer» B. there will be vacuum in the liquid | |
| 31. |
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar) |
| A. | 0.40 cm |
| B. | 0.20 cm |
| C. | 0.10 cm |
| D. | 0.05 cm |
| Answer» C. 0.10 cm | |
| 32. |
The process of diffusion of one liquid into the other through a semi-permeable membrane is called |
| A. | viscosity |
| B. | osmosis |
| C. | surface tension |
| D. | cohesion |
| Answer» C. surface tension | |
| 33. |
Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» B. 10% | |
| 34. |
Which of the following meters is not associated with viscosity |
| A. | Red wood |
| B. | Say bolt |
| C. | Engler |
| D. | Orsat |
| Answer» E. | |
| 35. |
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called |
| A. | upthrust |
| B. | reaction |
| C. | buoyancy |
| D. | metacentre |
| Answer» D. metacentre | |
| 36. |
Surge wave in a rectangular channel is an example ofi) steady flowii) unsteady flowiii) uniform flowiv) non-uniform flowThe correct answer is |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» E. | |
| 37. |
The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is |
| A. | constant over the cross section |
| B. | parabolic distribution across the section |
| C. | zero at the mid plane and varies linearly with distance from mid plane |
| D. | zero at plates and increases linearly to midpoint |
| Answer» D. zero at plates and increases linearly to midpoint | |
| 38. |
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is |
| A. | 10m/sec² |
| B. | 9.81 m/sec² |
| C. | 10.2/m sec |
| D. | 9.75 m/sec² |
| Answer» B. 9.81 m/sec² | |
| 39. |
A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of |
| A. | 3.75 m |
| B. | 4.0 m |
| C. | 4.2m |
| D. | 4.5m |
| Answer» D. 4.5m | |
| 40. |
Which of the following is used to measure the discharge ? |
| A. | current meter |
| B. | venturimeter |
| C. | pitot tube |
| D. | hotwire anemometer |
| Answer» C. pitot tube | |
| 41. |
Coefficient of velocity for Borda’s mouth piece running full is |
| A. | 0.611 |
| B. | 0.707 |
| C. | 0.855 |
| D. | 1.00 |
| Answer» C. 0.855 | |
| 42. |
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe) |
| A. | 1/3 R |
| B. | 1/2 R |
| C. | 2/3 R |
| D. | 3/4 R |
| Answer» B. 1/2 R | |
| 43. |
The horizontal component of force on a curved surface is equal to the |
| A. | product of pressure intensity at its centroid and area |
| B. | force on a vertical projection of the curved surface |
| C. | weight of liquid vertically above the curved surface |
| D. | force on the horizontal projection of the curved surface |
| Answer» C. weight of liquid vertically above the curved surface | |
| 44. |
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ? |
| A. | 1 : 5 |
| B. | 1 : 2.5 |
| C. | 1 :25 |
| D. | 1:50 |
| Answer» B. 1 : 2.5 | |
| 45. |
Two pipe systems are said to be equivalent when |
| A. | head loss and discharge are same in two systems |
| B. | length of pipe and discharge are same in two systems |
| C. | friction factor and length are same in two systems |
| D. | length and diameter are same in two systems |
| Answer» B. length of pipe and discharge are same in two systems | |
| 46. |
Which of the following instrument can be used for measuring speed of an aeroplane |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | rotameter |
| D. | pitot tube |
| Answer» E. | |
| 47. |
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is |
| A. | directly proportional to Reynolds number and independent of pipe wall roughness |
| B. | directly proportional to pipe wall roughness and independent of Reynolds number |
| C. | inversely proportional to Reynolds number and indpendent of pipe wall roughness |
| D. | inversely proportional to Reynolds number and directly proportional to pipe wall roughness |
| Answer» D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness | |
| 48. |
The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head) |
| A. | H/3 |
| B. | H/2 |
| C. | 2 H/5 |
| D. | 2 H/3 |
| Answer» E. | |
| 49. |
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be |
| A. | 300 |
| B. | 337.5 |
| C. | 600 |
| D. | 675 |
| Answer» E. | |
| 50. |
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ? |
| A. | 10 m/sec |
| B. | 25 m/sec |
| C. | 2 m/sec |
| D. | 50 m/sec |
| Answer» D. 50 m/sec | |