Reynolds number is defined as the ratio of:
Show Hint
- Viscous force to Inertia force
- Elastic force to Pressure force
- Inertia force to Viscous force
- Gravity force to Inertia force
The Correct Option is C
Solution and Explanation
Step 1: Recall definition of Reynolds number.
Reynolds number is:
\[
Re = \frac{\rho V L}{\mu} = \frac{\text{Inertia force}}{\text{Viscous force}}.
\]
Step 2: Check options.
- (1) Viscous/Inertia = Wrong (inverse of Reynolds).
- (2) Elastic/Pressure = Related to Mach number, not Reynolds.
- (3) Inertia/Viscous = Correct definition.
- (4) Gravity/Inertia = Related to Froude number, not Reynolds.
Step 3: Conclusion.
Hence, Reynolds number is the ratio of inertia force to viscous force.
Top Questions on Fluid Mechanics
- The loss of head due to sudden enlargement in a pipe is expressed by: (where symbols have their usual meanings)
Which of the following statements are true?
A. The same Bernoulli's equation is applicable to all the points in the flow field if the flow is irrotational.
B. The value of "Constant in the Bernoulli's equation" is different for different streamlines if the flow is rotational.
C. When a nozzle is fitted at the end of a long pipeline, the discharge increases.
D. The velocity of flow at the nozzle end is more than that in the case of a pipe without a nozzle, the head in both cases being the same.
Choose the most appropriate answer from the options given below:- A practical example of steady non-uniform flow is given by the:
- If the dynamic viscosity of a fluid is 1.2 poise and its specific gravity is 0.8, then kinematic viscosity in SI units will be:
Which of the following statement/s is/are correct with regards to the tangential force which is needed to keep the speeds of different layers of liquid constant?
(A) It is directly proportional to the velocity difference between the two adjacent layers.
(B) It is inversely proportional to the area of contact between the two adjacent layers.
(C) It is inversely proportional to the distance between the two adjacent layers.
(D) None of the above.
- CUET (PG) - 2025
- Chemistry
- Fluid Mechanics
Questions Asked in CUET PG exam
- A rectangular section has width $b$ and depth $d$ and a symmetrical triangular section has base $b$ and depth $d$. The ratio of moment of inertia of rectangular section to that of triangular section with respect to their respective centroidal axis will be:
- CUET (PG) - 2025
- Strength of Materials
A weight of $500\,$N is held on a smooth plane inclined at $30^\circ$ to the horizontal by a force $P$ acting at $30^\circ$ to the inclined plane as shown. Then the value of force $P$ is:
- CUET (PG) - 2025
- Engineering Mechanics
A steel wire of $20$ mm diameter is bent into a circular shape of $10$ m radius. If modulus of elasticity of wire is $2\times10^{5}\ \text{N/mm}^2$, then the maximum bending stress induced in wire is:
- CUET (PG) - 2025
- Strength of Materials
- Shape of the "shear force diagram" for a simply supported beam subjected to pure moment $M$ at the center of span, will be:
- CUET (PG) - 2025
- Strength of Materials
- Which of the following statements is correct?
- CUET (PG) - 2025
- Strength of Materials