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This mock test of Fluid Dynamics MSQ for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Fluid Dynamics MSQ (mcq) to study with solutions a complete question bank.
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*Multiple options can be correct

QUESTION: 1

A massless conical flask filled with a liquid is kept on a table in a vaccum. The force exerted by the liquid on the base of the flask is *W*_{1}. The force exerted by the flask on the table is *W*_{2}.

Solution:

Pressure acts equally in all directions, and a liquid exerts forces on the walls of its container normal to the walls. Hence, the liquid forces on the sloping walls of the conical flask will have a net upward component.

The correct answers are: **W**_{1} > **W**_{2}, The force exerted by the liquid on the walls of the flask is ((**W**_{1} – **W**_{2})

*Multiple options can be correct

QUESTION: 2

A closed vessel in half filled with water. There is a hole near the top of the vessel and air is pumped out from this hole.

Solution:

The correct answers are: The pressure at the surface of the water will decrease, The force by the water on the bottom of the vessel will decrease

*Multiple options can be correct

QUESTION: 3

A liquid of density ρ comes out with a velocity ** v **from a horizontal tube of area of cross-section

Solution:

Volume of liquid discharged per second = * v* × 1 ×

Mass of this liquid = νAρ.

Momentum of this liquid = ν

The correct answers are:

*Multiple options can be correct

QUESTION: 4

Which of the following is not possible?

Solution:

The pressure at any point can never have different values.

In case of insufficient length of capillary tube the shape of meniscus is as below :

The correct answers are:

*Multiple options can be correct

QUESTION: 5

A cubical box is completely filled with mass *m* of a liquid and is given horizontal acceleration ** a** as shown. Match the force due to fluid pressure on the faces of the cube with their appropriate values (assume zero pressure at minimum pressure)

Solution:

Pressure varies with height ⇒ P = ρgh

and is horizontal with acceleration ⇒ P = ρℓa

So on (A) ρgh part is zero while average of ρax is

In (** B**) pℓa part is zero while average of pgx is

Similarly for other part.

The correct answers are: force on face ABFE is mg/2, force on face BFHD is mg/2, , force on face CGHD is

*Multiple options can be correct

QUESTION: 6

A cuboid is filled of density ρ_{2} upto height and with liquid of density ρ_{2}, also upto height *h* as shown. Which of the following are true :

Solution:

On ABCD avg pressure

No. of contact of ρ_{2} and not any pressure on ** ABCD** due to ρ

On ** CDEF** due to ρ

On

The correct answers are: Force on face ** ABCD** due to liquid of density ρ

Force on face

*Multiple options can be correct

QUESTION: 7

A cylindrical vessel of 90 ** cm** height is kept filled the brim. It has four holes 1, 2, 3, 4 which are respectively at heights of 20

Solution:

The maximum horizontal distance from the vessel comes from hole number 3 and 4 is height of hole from top.

horizontal distance

The correct answers are: hole number 4, hole number 3

*Multiple options can be correct

QUESTION: 8

A tank, which is open at the top, contains a liquid up to a height ** H**. A small hole is made in the side of the tank at a distance

Solution:

The velocity of efflux

The emerging liquid moves as a projectile and reaches the ground in time ** t**, where,

The correct answers are: If ** y** is increased from zero to

*Multiple options can be correct

QUESTION: 9

There is a small hole near the bottom of an open tank filled with a liquid. The speed of the water ejected does not depend on :

Solution:

The correct answers are: area of the hole, density of the liquid

*Multiple options can be correct

QUESTION: 10

The vessel shown in the figure has two sections of areas of cross-section *A*_{1} and *A*_{2}. A liquid of density fills both the sections, up to a height ** h** in each. Neglect atmospheric pressure. Then which of the following are correct.

Solution:

The correct answers are: The pressure at the base of the vessel is 2hρg. , The force exerted by the liquid on the base of the vessel is 2hρgA_{2}. , The weight of the liquid is , The walls of the vessel at the level ** X** exert a downward force on the liquid.

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