MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A floating body will remain in stable equilibrium, if |
| A. | The metacentre M is above the centre of gravity G |
| B. | The metacentre M is above the centre of buoyancy B |
| C. | The metacentre M is below the centre of gravity G |
| D. | The metacentre M is below the centre of buoyancy B |
| Answer» B. The metacentre M is above the centre of buoyancy B | |
| 2. |
Consider the following statements pertaining to the metacentric height of ocean-going vessels:1) Increase in the metacentric height reduces the period roll2) Some control of period of roll is possible if Cargo is placed further from the centre liner of ship3) In warships and racing yachts, metacentric height will be larger than other categories of ships4) For ocean-going vessels, metacentric height is of the order of 30 cm to 120 cmWhich of the above statements are correct? |
| A. | 1, 2, 3 and 4 |
| B. | 1, 2 and 3 only |
| C. | 1, 2 and 4 only |
| D. | 3 and 4 only |
| Answer» B. 1, 2 and 3 only | |
| 3. |
For the stability of a floating body, under the influence of gravity alone, which of the following is TRUE? |
| A. | Metacentre should be below centre of gravity |
| B. | Metacentre should be above centre of gravity |
| C. | Metacentre and centre of gravity must lie on the same horizontal line |
| D. | Metacentre and centre of gravity must lie on the same vertical line |
| Answer» C. Metacentre and centre of gravity must lie on the same horizontal line | |
| 4. |
A cone of relative density 0.8 is to float in water with its axis vertical and vertex downwards. Find the least apex angle of the cone for stable equilibrium. |
| A. | 30°03'33" |
| B. | 51°03'33" |
| C. | 41°03'33" |
| D. | 21°03'33" |
| Answer» B. 51°03'33" | |
| 5. |
A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively. |
| A. | 6.7 gm |
| B. | 7.6 gm |
| C. | 4.6 gm |
| D. | 5.6 gm |
| Answer» C. 4.6 gm | |
| 6. |
A solid body of specific gravity 0.5 is 10 m long 3 m wide and 2 m high. When it floats in water with its shortest edge vertical, its metacentric height is: |
| A. | 0.75 m |
| B. | 0.45 m |
| C. | 0.25 m |
| D. | 0.15 m |
| Answer» D. 0.15 m | |
| 7. |
A body of specific weight w1 floats on a liquid of specific weight w2. Then the ratio of the volume of the object above the liquid to its volume is: |
| A. | (w2 – w1)/w2 |
| B. | w2/(w2 – w1) |
| C. | (w2 – w1)/w1 |
| D. | w1/(w2 – w1) |
| Answer» B. w2/(w2 – w1) | |
| 8. |
Consider the following statements: The increase in metacentric height1) Increases stability2) Decreases stability3) Increases comfort for passengers in a ship4) Decreases comfort for passengers is a shipWhich of the above statements are correct? |
| A. | 1 and 3 |
| B. | 1 and 4 |
| C. | 2 and 3 |
| D. | 2 and 4 |
| Answer» C. 2 and 3 | |
| 9. |
If a submerged body, displaced from its equilibrium position, returns to its original position, it is called ______. |
| A. | neutral equilibrium |
| B. | stable equilibrium |
| C. | thermal equilibrium |
| D. | unstable equilibrium |
| Answer» C. thermal equilibrium | |
| 10. |
A wooden plank (sp.gr 0.5) 1 m × 1 m × 0.5 m floats is water with 1.5 kN load on it with 1 m × 1 m surface horizontal. The depth of plank lying below water surface shall be: |
| A. | 0.178 m |
| B. | 0.250 m |
| C. | 0.403 m |
| D. | 0.500 m |
| Answer» D. 0.500 m | |
| 11. |
For the stability of a floating body the |
| A. | Centre of buoyancy must coincide with the centre of gravity |
| B. | Centre of buoyancy must be above the centre of gravity |
| C. | Centre of gravity must be above the centre of buoyancy |
| D. | Metacentre must be above the centre of gravity |
| Answer» E. | |
| 12. |
A crane is used to lower weights into the sea (seawater density = 1025 kg/m3) for an underwater construction project. What is the percentage reduction in the tension in the rope of the crane due to a rectangular 0.4 m × 0.4 m × 3 m concrete block (density = 2300 kg/m3) when it is completely immersed in water compared to the tension in the rope when it was suspended in air |
| A. | 45% |
| B. | 55% |
| C. | 65% |
| D. | 75% |
| Answer» B. 55% | |
| 13. |
Four cars each of mass 1500 kg, are loaded on a 6 m wide, 12 m long small car ferry. How far, in cm will it sink in the water? |
| A. | 15.2 |
| B. | 11.5 |
| C. | 10.2 |
| D. | 8.3 |
| Answer» E. | |
| 14. |
Metacentric height is the distance between: |
| A. | Water surface and center of pressure |
| B. | Metacentre and center of gravity |
| C. | Metacentre and center of buoyancy |
| D. | Metacentre and water surface |
| Answer» C. Metacentre and center of buoyancy | |
| 15. |
A rectangular pontoon has a width of 6 m, a length of 12 m, and a draught of 1.5 m in fresh water (density = 1000 kg / m3). Its draught in sea water having density of 1025 kg / m3 is |
| A. | 1.04 m |
| B. | 1.24 m |
| C. | 1.46 m |
| D. | 1.50 m |
| Answer» D. 1.50 m | |
| 16. |
For a completely submerged body with centre of gravity ‘G’ and centre of buoyancy ‘B’, the condition of stability will be |
| A. | G is located below B |
| B. | G is located above B |
| C. | G and B are coincident |
| D. | independent of the locations of G and B |
| Answer» B. G is located above B | |
| 17. |
On which of the following factors the magnitude of the buoyant force acting on a body in a given fluid depends? |
| A. | Weight of the body immersed in it |
| B. | Shape of the body immersed in the fluid. |
| C. | Density of the fluid and mass of the body immerse in it |
| D. | Density of the fluid and the volume of the body immersed in it |
| Answer» E. | |
| 18. |
A cubical block of wood of 1 m side and density 500 kg/m3 floats in seawater of density 1000 kg/m3. The depth of immersion of the block is: |
| A. | 0.625 m |
| B. | 1 m |
| C. | 23 cm |
| D. | 0.5 m |
| Answer» E. | |