The velocity at which the laminar flow stops is known as

Which of the following statements is/are CORRECT regarding the flow of fluid? a) All fluid layers are parallel to each other in case of turbulent flow. b) The Reynold’s number is less than 2000 for turbulent flow and greater than 4000 for laminar flow. c) Two fluid layers don’t cross each other in case of laminar flow

A

Only a is correct.

B

Only b is correct

C

Only c is correct

D

All a, b and c are correct

The following word problem was given to a child of Class IV Mumbai has 336 bus stops. Delhi has 127 more bus stops than Mumbai. How many bus stops are there in all, in Delhi? The child's response to the above problem is recorded as 336 Mumbai 336 127 Delhi Total bus stops in Delhi are 336 + 127 = 463. The teacher shall report about his performance as [CTET Feb 2014]

A

the child can find the answer correctly but his expression is poor

B

the child is good at visualizing and analyzing and his problem-solving ability is appreciable

C

the child has not adopted the right procedure. He needs to practice more

D

the child is not able to write all steps required properly

During fully developed laminar flow in a circular pipe, the velocity profile is parabolic, and symmetric around the axis. The velocity at the tube wall is zero. The ratio of the average velocity to the maximum velocity is

A

$$\frac{1}{{64}}$$

B

$$\frac{1}{2}$$

C

$$\frac{2}{3}$$

D

$$\frac{3}{4}$$

The velocity at which the laminar flow stops, is known as

A

Velocity of approach

B

Lower critical velocity

C

Higher critical velocity

D

None of these

The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)

A

0.423 D

B

0.577 D

C

0.223 D

D

0.707 D

There are five bus stops, A, B, C, D, E at equal intervals. C is not the middle stop. A and E are not terminal stops. C comes first in the upward journey as B comes after A. A is the second in the upward journey. D is the first stop in the downward journey. The correct sequence of stops in a downward journey is

A

ABDCE

B

CDAEB

C

DACEB

D

DEBAC

The velocity at which the flow changes from laminar flow to turbulent flow is called

A

Critical velocity

B

Velocity of approach

C

Sub-sonic velocity

D

Super-sonic velocity

Consider the following assumptions as regards the field permeability test: 1. The flow is laminar and Darcy’s law is valid. 2. The flow is horizontal and uniform at all points in the vertical section. 3. The velocity of flow is proportional to the ‘tangent magnitude’ of the hydraulic gradient. Which of the above assumptions are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Statement 1: Sieder-Tate and Dittus-boelter equations imply only to laminar flow conditions. Statement 2: Under laminar conditions, the same equation applies both to Newtonian and Non-Newtonian fluids.

A

True, False

B

True, True

C

False, False

D

False, True

Which of the following activities should be shown separately in the cash flow statement prepared as per Accounting Standard-3?
1. Cash flow from borrowing activities
2. Cash flow from operating activities
3. Cash flow from financing activities
4. Cash flow from investing activities
5. Cash flow from miscellaneous activitie

A

1, 2 and 3

B

1, 3 and 5

C

1, 3 and 4

D

1, 2 and 5

The velocity at which the laminar flow stops is known as

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