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Question
Consider the following statements
1. A streamline is an imaginary line within the flow for which the normal at any point relates to the acceleration at that point.
2. Convective acceleration is the change in velocity with respect to time only.
3. Temporal acceleration expresses variation of velocity with respect to distance only.
4. Both convective acceleration and temporal acceleration can coexist.
Which of these statements are correct related to fluid kinematics?
A.
1, 2, 3 and 4
B.
2, 3 and 4 only
C.
1 and 4 only
D.
4 only
Answer ( Option D)

4 only

Solution

A stream line is an imaginary line within the flow for which tangent at any point gives the direction of the velocity of flow at that point.
Statement 1 is incorrect because streamlines can be straight also and for that, there won't be any normal acceleration.
& Temporal acceleration expresses variation of velocity with respect to distance only.
Hence, Statements 2 and 3 are incorrect.
Both convective acceleration and temporal acceleration can coexist.
Hence, Statement 4 is correct.

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