MCQOPTIONS
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MCQOPTIONS
This section includes 78 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which dimensionless number has a significant role in forced convection? |
| A. | Prandtl number |
| B. | Peclet number |
| C. | Mach number |
| D. | Reynolds number |
| Answer» E. | |
| 2. |
The ratio of heat capacity of fluid flowing through the pipe per unit of length to the conductivity of pipe material is known as |
| A. | Graetz number |
| B. | Reynolds number |
| C. | Peclet number |
| D. | Fourier number |
| Answer» B. Reynolds number | |
| 3. |
Ratio of inertia force to viscous force is known as |
| A. | Grashof number |
| B. | Reynolds number |
| C. | Peclet number |
| D. | Stanton number |
| Answer» C. Peclet number | |
| 4. |
The similarity of motion is known as |
| A. | Thermal similarity |
| B. | Dynamic similarity |
| C. | Geometrical similarity |
| D. | Kinematic similarity |
| Answer» E. | |
| 5. |
Free convection heat flow does not depends on |
| A. | Density |
| B. | Coefficient of viscosity |
| C. | Gravitational force |
| D. | Velocity |
| Answer» C. Gravitational force | |
| 6. |
The value of Prandtl number for air is about |
| A. | 0.1 |
| B. | 0.4 |
| C. | 0.7 |
| D. | 1.1 |
| Answer» D. 1.1 | |
| 7. |
Heat is loss from a 100 mm diameter steam pipe placed horizontally in ambient air at 30 degree Celsius. If the Nusselt number is 25 W/m² K and thermal conductivity of the air is 0.03 W/m K, then heat transfer coefficient will be |
| A. | 7.5 W/m² K |
| B. | 16.5 W/m² K |
| C. | 25 W/m² K |
| D. | 30 W/m² K |
| Answer» B. 16.5 W/m² K | |
| 8. |
The similarity of masses and forces of the corresponding particles of flow is known as |
| A. | Kinematic similarity |
| B. | Dynamic similarity |
| C. | Geometrical similarity |
| D. | Thermal similarity |
| Answer» C. Geometrical similarity | |
| 9. |
Identify the correct statement |
| A. | Peclet number = (Graetz number) (Fourier number) |
| B. | Peclet number = (Stanton number) (Fourier number) |
| C. | Peclet number = (Reynolds number) (Prandtl number) |
| D. | Peclet number = (Graetz number) (Reynolds number) |
| Answer» D. Peclet number = (Graetz number) (Reynolds number) | |
| 10. |
The non-dimensional parameter known as Stanton number is used in |
| A. | Forced convection heat transfer |
| B. | Condensation heat transfer |
| C. | Natural convection heat transfer |
| D. | Unsteady state heat transfer |
| Answer» B. Condensation heat transfer | |
| 11. |
The Prandtl number will be lowest for |
| A. | Water |
| B. | Liquid metal |
| C. | Lube oil |
| D. | Aqueous solution |
| Answer» C. Lube oil | |
| 12. |
A similarity in thermal quantities is achieved when |
| A. | Nusselt number is same for both the fields |
| B. | Nusselt number is different for both the fields |
| C. | Prandtl number is same for both the fields |
| D. | Prandtl number is different for both the fields |
| Answer» D. Prandtl number is different for both the fields | |
| 13. |
What is the value of Prandtl number for liquid metals? |
| A. | 0.003-0.01 |
| B. | 0.01-0.1 |
| C. | 0.1-0.5 |
| D. | 0.5-0.95 |
| Answer» B. 0.01-0.1 | |
| 14. |
Let us say Mach number (greater than one), the flow is |
| A. | Sonic |
| B. | Subsonic |
| C. | Supersonic |
| D. | No flow |
| Answer» D. No flow | |
| 15. |
The comparison of two systems made on the basic of their temperature, specific heat and heat flus is known as |
| A. | Dynamic similarity |
| B. | Kinematic similarity |
| C. | Thermal similarity |
| D. | Geometrical similarity |
| Answer» D. Geometrical similarity | |
| 16. |
The ratio of heat flow rate by convection to flow rate by conduction is known as |
| A. | Stanton number |
| B. | Graetz number |
| C. | Fourier number |
| D. | Peclet number |
| Answer» E. | |
| 17. |
Ratio of actual velocity to sonic velocity is known as |
| A. | Mach number |
| B. | Peclet number |
| C. | Reynolds number |
| D. | Grashof number |
| Answer» B. Peclet number | |
| 18. |
The similarity of shape and form is known as |
| A. | Geometrical similarity |
| B. | Thermal similarity |
| C. | Geometrical similarity |
| D. | Kinematic similarity |
| Answer» E. | |
| 19. |
What is the value of Prandtl number for highly viscous oils? |
| A. | 100-1000 |
| B. | 0-100 |
| C. | 10-100 |
| D. | 100-10000 |
| Answer» E. | |
| 20. |
The dimensionless parameter l³ p² β g d t/µ² is referred to as |
| A. | Stanton number |
| B. | Schmidt number |
| C. | Grashof number |
| D. | Peclet number |
| Answer» D. Peclet number | |
| 21. |
How is dimensional homogeneity related with fundamental units of measurements? |
| A. | Independent |
| B. | Dependent |
| C. | Dependent but can vary |
| D. | Twice |
| Answer» B. Dependent | |
| 22. |
Bernoulli’s equation for fluid flow along a stream line is given as |
| A. | p/w + V²/2 g + y = 2 |
| B. | p/w + V/2 g + y = constant |
| C. | p/w + V²/2 g + y = 1 |
| D. | p/w + V²/2 g + y = constant |
| Answer» E. | |
| 23. |
What is the time period of oscillation of a simple pendulum of length L and mass m? |
| A. | 2 π (L/g)^3/2 |
| B. | 2 π (L/g) |
| C. | 2 π (L/g)^2 |
| D. | 2 π (L/g)^1/2 |
| Answer» E. | |
| 24. |
The principle of dimensional homogeneity serves the following useful concepts(i) It helps to check whether an equation of any physical phenomenon is dimensionally homogenous or not(ii) It helps to determine the dimensions of a physical quantity(iii) It helps to convert the units from one system to anotherIdentify the correct statements |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1, 2 and 3 |
| D. | 2 only |
| Answer» D. 2 only | |
| 25. |
Which of the following is not known as core group? |
| A. | Time |
| B. | Geometric property |
| C. | Fluid property |
| D. | Flow characteristics |
| Answer» B. Geometric property | |
| 26. |
What is the dimension of resistance? |
| A. | M L T² |
| B. | M L T |
| C. | M L T¯² |
| D. | M L T¯¹ |
| Answer» D. M L T¯¹ | |
| 27. |
If there are n variables in a dimensionally homogeneous equation and if these variables contain m primary dimensions, then the variables can be grouped into how many non-dimensional parameters? |
| A. | m |
| B. | n-m |
| C. | n-2m |
| D. | n |
| Answer» C. n-2m | |
| 28. |
The resistance R experienced by a partially submerged body depends upon the velocity V, length of the body l, viscosity of the fluid µ, density of the fluid p and gravitational acceleration g. Establish a relation between involving non-dimensional groups |
| A. | R = p V l² function [p V l/ µ, V/ (lg)^1/2]. |
| B. | R = p l² function [p V l/ µ, V/ (lg)^1/2]. |
| C. | R = V² l² function [p V l/ µ, V/ (lg)^1/2]. |
| D. | R = p V² l function [p V l/ µ, V/ (lg)^1/2]. |
| Answer» E. | |
| 29. |
How many Newton’s are there in one kg? |
| A. | 9.507 |
| B. | 9.607 |
| C. | 9.707 |
| D. | 9.807 |
| Answer» E. | |
| 30. |
If there are 6 physical quantities and 3 fundamental units, then the number of pi terms are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 31. |
The pressure in kg/cm² can be converted to N/m² by multiplying it with a factor |
| A. | 9.807 * 10² |
| B. | 9.807 * 10³ |
| C. | 9.807 * 10⁴ |
| D. | 9.807 * 10⁵ |
| Answer» D. 9.807 * 10⁵ | |
| 32. |
How many fundamental quantities are there? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 33. |
How many Joule are there in 1 k cal? |
| A. | 3186 |
| B. | 4186 |
| C. | 5186 |
| D. | 6186 |
| Answer» C. 5186 | |
| 34. |
The convective film coefficient in k cal/m² hr degree can be converted to J/m² s degree by multiplying it with a factor |
| A. | 1.1627 |
| B. | 1.1527 |
| C. | 1.1427 |
| D. | 1.1327 |
| Answer» B. 1.1527 | |
| 35. |
What is the dimension of acceleration? |
| A. | M L T¯² |
| B. | L T¯⁴ |
| C. | M L T¯¹ |
| D. | L T¯² |
| Answer» E. | |
| 36. |
What is the dimension of gravity? |
| A. | M L T¯² |
| B. | L T¯² |
| C. | M L T¯¹ |
| D. | L T¯⁴ |
| Answer» C. M L T¯¹ | |
| 37. |
What is the dimension of specific heat? |
| A. | L T¯¹ α¯¹ |
| B. | M L T¯¹ α¯¹ |
| C. | L T¯² α¯¹ |
| D. | M L T¯² α¯¹ |
| Answer» D. M L T¯² α¯¹ | |
| 38. |
What is the dimension of thermal conductivity? |
| A. | M L T¯³ α¯¹ |
| B. | M L T¯³ |
| C. | M L T¯² α¯¹ |
| D. | M L T¯³ α¯² |
| Answer» B. M L T¯³ | |
| 39. |
What is the dimension of density? |
| A. | M L¯³ T |
| B. | M L¯³ |
| C. | M L¯³ T² |
| D. | M L ¯² |
| Answer» C. M L¯³ T² | |
| 40. |
The results obtained from experiments on models can be applied to prototype only if a complete similarity exists between the model and prototype and for that the two systems may be(i) Geometrically similar(ii) Kinematically similar(iii) Dynamically similarIdentify the correct statements |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1, 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 41. |
Geometrically similarity prescribes that the ratio of the corresponding linear dimensions of the two systems are |
| A. | Unity |
| B. | Same |
| C. | Never same |
| D. | May be twice |
| Answer» C. Never same | |
| 42. |
Thermal similarity refers to the comparison of two systems made on the basis of their |
| A. | Temperature |
| B. | Specific heat |
| C. | Heat flux |
| D. | Length |
| Answer» E. | |
| 43. |
Which is a full size structure employed in the actual engineering design? |
| A. | Proton |
| B. | Prototype |
| C. | Electron |
| D. | Neutron |
| Answer» C. Electron | |
| 44. |
Which term refers to the theory and art of predicting prototype conditions from model observations? |
| A. | Nusselt number |
| B. | Dimensional homogeneity |
| C. | Thermal boundary layer |
| D. | Similitude |
| Answer» E. | |
| 45. |
S.I unit of dynamic viscosity is |
| A. | kg/m |
| B. | kg/m s |
| C. | m/kg |
| D. | m s /kg |
| Answer» C. m/kg | |
| 46. |
S.I unit of specific heat is |
| A. | K kg/J |
| B. | kg/K |
| C. | k J/kg K |
| D. | J/K |
| Answer» D. J/K | |
| 47. |
S.I unit of heat is |
| A. | J |
| B. | W |
| C. | J s |
| D. | W/K |
| Answer» B. W | |
| 48. |
S.I unit of coefficient of volumetric expansion is |
| A. | Degree |
| B. | Per meter |
| C. | Per second |
| D. | Per degree |
| Answer» E. | |
| 49. |
The study of predicting prototype conditions from model observations is known as |
| A. | Similitude |
| B. | Geometrical similarity |
| C. | Prototype |
| D. | Model |
| Answer» B. Geometrical similarity | |
| 50. |
The product of buoyant force and inertia force to the square of the viscous force is known as |
| A. | Stanton number |
| B. | Grashof number |
| C. | Fourier number |
| D. | Peclet number |
| Answer» C. Fourier number | |