MCQOPTIONS
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MCQOPTIONS
This section includes 79 Mcqs, each offering curated multiple-choice questions to sharpen your Bioprocess Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
“Mach is the Dimensionless quantity”. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
If the equation of a velocity profile over a plate is v = 5y2 + y (where v is the velocity in m/s) determine the shear stress at y = 0. Given the viscosity of the liquid is 8.35 poise. |
| A. | 0.83 |
| B. | 0.832 |
| C. | 0.835 |
| D. | 0.834 |
| Answer» D. 0.834 | |
| 3. |
Refer to Q 10 and Q11, and calculate specific volume. |
| A. | 6.51 × 10-5 m3/N |
| B. | 6.78 × 10-5 m3/N |
| C. | 6.45 × 10-5 m3/N |
| D. | 6.57 × 10-5 m3/N |
| Answer» E. | |
| 4. |
Refer to Q10 and calculate specific gravity. |
| A. | 1.55 |
| B. | 1.56 |
| C. | 1.50 |
| D. | 1.54 |
| Answer» B. 1.56 | |
| 5. |
A liquid has a mass density of 1550 kg/m3. Calculate its specific weight. |
| A. | 1.50×102 N/m3 |
| B. | 1.52×104 N/m3 |
| C. | 1.54×104 N/m3 |
| D. | 1.50×104 N/m3 |
| Answer» C. 1.54×104 N/m3 | |
| 6. |
Refer to Q8 and Calculate specific gravity of the oil. (Specific weight of water = 9.807 kN/m3) |
| A. | 0.991 |
| B. | 0.918 |
| C. | 0.917 |
| D. | 0.992 |
| Answer» D. 0.992 | |
| 7. |
If 5 m3 of certain oil weighs 45 kN calculate the specific weight of the oil. |
| A. | 10 kN/m3 |
| B. | 9 kN/m3 |
| C. | 5 kN/m3 |
| D. | 2 kN/m3 |
| Answer» C. 5 kN/m3 | |
| 8. |
What do you mean by the term “Rheology”? |
| A. | Study of materials with both solid and fluid characteristics |
| B. | Study of materials with only solid characteristics |
| C. | Study of materials with only fluid characteristics |
| D. | Study of material with both fluid and gas characteristics |
| Answer» B. Study of materials with only solid characteristics | |
| 9. |
Which of the following is not an example of a Non- Newtonian fluids? |
| A. | Gels |
| B. | Water |
| C. | Suspensions |
| D. | Pudding |
| Answer» C. Suspensions | |
| 10. |
“The density of liquids is practically dependent of pressure”? |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
Ice at -20°C is added to 50 g of water at 40°C. When the temperature of the mixture reaches 0°C, it is found that 20 g of ice is still unmelted. The amount of ice added to the water was close to(Take, specific heat of water = 4.2 J/g/°C, Specific heat of ice = 2.1 J/g/°C and Heat of fusion of water at 0°C = 344 J/g) |
| A. | 40 g |
| B. | 50 g |
| C. | 60 g |
| D. | 100 g |
| Answer» B. 50 g | |
| 12. |
A cubical block of side 0.5 m floats on water with 30% of its volume under water. What is the maximum weight that can be put on the block without fully submerging it under water?[Take, density of water = 103 kg/m3] |
| A. | 46.3 kg |
| B. | 87.5 kg |
| C. | 65.4 kg |
| D. | 30.1 kg |
| Answer» C. 65.4 kg | |
| 13. |
A big drop of water is broken into smaller drops, the surface energy: |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | can increase as well as decrease |
| Answer» B. decreases | |
| 14. |
A fluid is flowing through a horizontal pipe. When pipe is constricted then- |
| A. | velocity increases and pressure decreases |
| B. | velocity decreases and pressure increases |
| C. | Both velocity and pressure Increases |
| D. | Both velocity and pressure decreases |
| Answer» B. velocity decreases and pressure increases | |
| 15. |
A solid weighs 50 gf in air and 44 gf in liquid of relative density 0.90 when completely immersed. Find the density of the solid. |
| A. | 5.5 gm/cm3 |
| B. | 7.5 gm/cm3 |
| C. | 4.5 gm/cm3 |
| D. | 6.5 gm/cm3 |
| Answer» C. 4.5 gm/cm3 | |
| 16. |
A metallic sphere with an internal cavity weight 40g in air and in water it weighs 20g. If the density of material with cavity be 8gm/cc then the volume of cavity is: |
| A. | 15cc |
| B. | 5cc |
| C. | 20cc |
| D. | 1cc |
| Answer» B. 5cc | |
| 17. |
How much work is done to break up a drop of water of radius 1 mm, into 106 numbers of droplets of idential size? (Surface tension of water is 74 dyne/cm) |
| A. | 120 ergs |
| B. | 150 ergs |
| C. | 200 ergs |
| D. | 230 ergs |
| Answer» B. 150 ergs | |
| 18. |
Bernoulli’s theorem is based on which of the following laws? |
| A. | Conservation of mass |
| B. | Conservation of momentum |
| C. | Conservation of angular momentum |
| D. | Conservation of energy |
| Answer» E. | |
| 19. |
A body is floating in a liquid partly immersed. The body and the liquid are taken to moon. The body |
| A. | will continue to float as before. |
| B. | floats with greater part immersed. |
| C. | floats with lesser part immersed. |
| D. | will sink. |
| Answer» B. floats with greater part immersed. | |
| 20. |
A raindrop with a radius of 1.5 mm falls from a cloud that is at a height of 1200 m above the ground. The drag coefficient (C) for the drop is 0.60. Assume that the drop is spherical throughout its fall. The density of water is 1000 kgm-3 and the density of air is 1.2 kgm-3. Then the terminal speed of the drop is (g = 9.8 ms-2) |
| A. | 5 ms-1 |
| B. | 7.4 ms-1 |
| C. | 54.76 ms-1 |
| D. | 25 ms-1 |
| Answer» C. 54.76 ms-1 | |
| 21. |
Clouds float in the air, because of: |
| A. | low viscosity |
| B. | high viscosity |
| C. | low density |
| D. | high density |
| Answer» D. high density | |
| 22. |
One plano-convex and one plano-concave lens of same radius of curvature ‘R’ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of 1 is μ1 and that of 2 is μ2, then the focal length of the combination is: |
| A. | \(\frac{{\rm{R}}}{{{\mu _1} - {\mu _2}}}\) |
| B. | \(\frac{{2{\rm{R}}}}{{{\mu _1} - {\mu _2}}}\) |
| C. | \(\frac{{\rm{R}}}{{2\left( {{\mu _1} - {\mu _2}} \right)}}\) |
| D. | \(\frac{{\rm{R}}}{{2 - \left( {{\mu _1} - {\mu _2}} \right)}}\) |
| Answer» B. \(\frac{{2{\rm{R}}}}{{{\mu _1} - {\mu _2}}}\) | |
| 23. |
A thin convex lens L (refractive index = 1.5) is placed on a plane mirror M. When a pin is placed at A, such that OA = 18 cm, its real inverted image is formed at A itself, as shown in figure. When a liquid of refractive index μl is put between the lens and the mirror, the pin has to be moved to A’, such that OA’ = 27 cm, to get its inverted real image at A’ itself. The value of μl will be: |
| A. | 4/3 |
| B. | 3/2 |
| C. | √3 |
| D. | √2 |
| Answer» B. 3/2 | |
| 24. |
At what temperature water has maximum density? |
| A. | 16°C |
| B. | 0°C |
| C. | 8°C |
| D. | 4°C |
| Answer» E. | |
| 25. |
A heat source at T = 103 K is connected to another heat reservoir at T = 102 K by a copper slab which is 1 m thick. Given that the thermal conductivity of copper is 0.1 WK-1 m-1, the energy flux through it in the steady state is |
| A. | 90Wm-2 |
| B. | 65 Wm-2 |
| C. | 120 Wm-2 |
| D. | 200 Wm-2 |
| Answer» B. 65 Wm-2 | |
| 26. |
Pick the correct statement about mechanical pressure on fluid element. |
| A. | It is a first order tensor and depends upon the orientation of the surface upon which it acts. |
| B. | It is a zero order tensor and does not depend upon the orientation of the surface upon which it acts. |
| C. | It is a zero order tensor and depends upon the orientation of the surface upon which it acts. |
| D. | It is a first order tensor and does not depend upon the orientation of the surface upon which it acts. |
| Answer» C. It is a zero order tensor and depends upon the orientation of the surface upon which it acts. | |
| 27. |
Bernoulli’s equation holds only for ___________. |
| A. | low viscosity and incompressible fluids in turbulent flow |
| B. | high viscosity and compressible fluids in streamline flow |
| C. | low viscosity and compressible fluids in turbulent flow |
| D. | low viscosity and incompressible fluids in streamline flow |
| Answer» E. | |
| 28. |
From Bernoulli’s equation, the plot of the hydraulic grade line represents the _______ along the flow. |
| A. | sum of pressure and potential energy |
| B. | sum of pressure and kinetic energy |
| C. | sum of potential and kinetic energy |
| D. | sum of potential, pressure and kinetic energy |
| Answer» B. sum of pressure and kinetic energy | |
| 29. |
A solid sphere of radius b is having a concentric cavity of radius a. The sphere floats on the surface of water such that half of its volume sinks in water. Find the relative density of material of the sphere. |
| A. | \(\frac{{{b^3}}}{{{a^3}}}\) |
| B. | \(\frac{{{b^3}}}{{{b^3} - {a^3}}}\) |
| C. | \(\frac{{{b^3}}}{{2\left( {{b^3} - {a^3}} \right)}}\) |
| D. | \(\frac{{2{b^3}}}{{{b^3} - {a^2}}}\) |
| Answer» D. \(\frac{{2{b^3}}}{{{b^3} - {a^2}}}\) | |
| 30. |
Along a streamline flow of fluid |
| A. | The velocity of all fluid particle at a given instant is constant |
| B. | The speed of a fluid particles remains constant |
| C. | The velocity of all fluid particles crossing a given position is constant |
| D. | The velocity of a fluid particle remains constant |
| Answer» D. The velocity of a fluid particle remains constant | |
| 31. |
At a depth of 1 km from the surface of water, the increase in pressure is _________. |
| A. | 100 atm |
| B. | 1000 atm |
| C. | 100 Pa |
| D. | 1000 Pa |
| Answer» B. 1000 atm | |
| 32. |
A liquid of density ρ is coming out of a hose pipe of radius \(\alpha \) with horizontal speed v and hits a mesh. 50% of the liquid passes through the mesh unaffected 25% losses all of its momentum and, 25% comes back with the same speed. The resultant pressure on the mesh will be |
| A. | ρv2 |
| B. | \(\frac{1}{2}\rho {v^2}\) |
| C. | \(\frac{1}{4}\rho {v^2}\) |
| D. | \(\frac{3}{4}\rho {v^2}\) |
| Answer» E. | |
| 33. |
__________________ equation relates the pressure difference between two points in a pipe to changes in Kinetic as well as potential energy. |
| A. | Pascal' s |
| B. | Archimedes' |
| C. | Bernoulli's |
| D. | Torricelli's |
| Answer» D. Torricelli's | |
| 34. |
Bernoulli's theorem is a consequence of conservation of: |
| A. | Energy |
| B. | Momentum |
| C. | Angular momentum |
| D. | Mass |
| Answer» B. Momentum | |
| 35. |
For a liquid flowing in a pipe where cross section area changes from A1 to A2 and velocity of flow changes from v1 to v2, then A1 × v1 = A2 × v2 is called _________. |
| A. | Equation of conservation of energy |
| B. | Equation of magnification |
| C. | Equation of translation |
| D. | Equation of Continuity |
| Answer» E. | |
| 36. |
A liquid surface behaves like a stretched membrane and tends to contract to the smallest possible area. This property is known as |
| A. | Viscosity |
| B. | Surface tension |
| C. | Buoyancy |
| D. | Hydrostatic equilibrium |
| Answer» C. Buoyancy | |
| 37. |
A deep-sea diver may hurt his eardrum during diving because of |
| A. | Lack of oxygen |
| B. | High atmospheric pressure |
| C. | High water pressure |
| D. | All of the above |
| Answer» D. All of the above | |
| 38. |
A pressure equivalent of 1 mm (of Hg) is called a__________. |
| A. | Pascal |
| B. | Sievert |
| C. | Torr |
| D. | Weber |
| Answer» D. Weber | |
| 39. |
In the Stoke's Law formula (F = – 6πηav), 'η' represents _______________. |
| A. | Reynold's number |
| B. | pressure |
| C. | viscosity |
| D. | relative density |
| Answer» D. relative density | |
| 40. |
A typical ionization gauge is used to measure total pressure in the range of |
| A. | 1000 mbar to 10-2 mbar |
| B. | 10-2 mbar to 10-4 mbar |
| C. | 10-5 mbar to 10-9 mbar |
| D. | 10-9 mbar to 10-14 mbar |
| Answer» D. 10-9 mbar to 10-14 mbar | |
| 41. |
One end of a cylindrical pipe of cross-section 6.6 cm² has 14 holes each of radius 1 mm. If water is flowing in the pipe at 1 m/min then what is the speed (in m/s) of efflux through the holes? |
| A. | .0.25 |
| B. | 0.125 |
| C. | 0.625 |
| D. | 0.5 |
| Answer» B. 0.125 | |
| 42. |
1 torr = ______ Pa. |
| A. | 760 |
| B. | 1.013 |
| C. | 100000 |
| D. | 133 |
| Answer» E. | |
| 43. |
A liquid drop acquires spherical shape due to: |
| A. | Gravity |
| B. | Surface tension |
| C. | Viscosity |
| D. | Intermolecular interaction |
| Answer» C. Viscosity | |
| 44. |
In physics, fluid is a substance that- |
| A. | Is essentially incompressible |
| B. | Always moves when subjected to a shearing stress |
| C. | Has a viscosity that always increases with temperature |
| D. | Has a viscosity that always decreases with temperature |
| Answer» C. Has a viscosity that always increases with temperature | |
| 45. |
Ice is floating on water in a glass. If the ice melts, what will be the effect on the volume? |
| A. | Volume will increase |
| B. | Volume will decrease |
| C. | Volume will remain the same |
| D. | None of the above |
| Answer» D. None of the above | |
| 46. |
A submarine experiences a pressure of 5.05 × 106 Pa at depth of d1 in a sea. When it goes further to a depth of d2, it experiences a pressure of 8.08 × 106 Pa. Then, d2 - d1 is approximately (density of water = 103 kg/m3 and acceleration due to gravity = 10 ms-2: |
| A. | 300 m |
| B. | 400 m |
| C. | 600 m |
| D. | 500 m |
| Answer» B. 400 m | |
| 47. |
A container is first filled with water and then the entire water is replaced by mercury. Mercury has a density of 13.6 × 103 kg/m3. If X is the weight of the water and Y is the weight of the mercury, then |
| A. | X = Y |
| B. | X = 13.6 Y |
| C. | Y = 13.6 X |
| D. | None of the above |
| Answer» D. None of the above | |
| 48. |
In case of a non-Newtonian fluid |
| A. | The viscosity is well defined and does not vary with time |
| B. | Newton's law of viscosity is obeyed |
| C. | Viscosity depends on the shear rate and shear rate history |
| D. | Viscosity never depends on sheer rate history but depends on sheer rate |
| Answer» D. Viscosity never depends on sheer rate history but depends on sheer rate | |
| 49. |
1 atm = ______________ Pa |
| A. | 760 |
| B. | 133 |
| C. | 1000 |
| D. | 1.013 x 105 |
| Answer» E. | |
| 50. |
In cold season when lakes freeze, only the top water freezes. Below this layer the water does not freeze, and the aquatic life survives. This happens because of: |
| A. | Poor thermal conductivity of ice |
| B. | The density of water is maximum at 4°C |
| C. | Heat convection does not take place in water |
| D. | Low latent heat of fusion of water |
| Answer» C. Heat convection does not take place in water | |