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Question (1)

QN0035609

In Bernoulli's theorem which of the following is conserved?

(A)
Mass
(B)
Linear momentum
(C)
Energy
(D)
Angular momentum

Correct Answer: C

Explanation:

In Bernoulli's theorem only law of conservation of energy is obeyed.

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Question (2)

QN0035610

A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following:

(A)
the speed is high at the wider end and high at the narrow end.
(B)
the speed is low at the wider end and high at the narrow end.
(C)
the speed is same at both ends in a stream line flow.
(D)
the liquid flows with uniform velocity in the tube.

Correct Answer: B

Explanation:

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Question (3)

QN0035611

Water flows through a frictionless tube with a varying cross-section as shown in fig. Pressure at points along the axis is represented by

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

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Question (4)

QN0035612

A wide vessel with a small hole at the bottom is filled with water (density , height ) and kerosene (density , height ). Neglecting viscosity effects, the speed with which water flows out is :

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

As .

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Question (5)

QN0035613

Consider a cylindrical tank of radius is filled with water. The top surface of water is at from the bottom of the cylinder. There is a hole on the wall of cylinder at a height of from the bottom: A force of is applied on the top surface of water using a piston. The speed of efflux from the hole will be :
(given atmospheric pressure , density of water and gravitational acceleration )

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Apply Bernoulli's theorem between Piston and hole

Assuming there is no atmospheric pressure on piston

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Question (6)

QN0035614

Water flows in a horizontal tube (see figure). The pressure of water changes by between and where the area of cross section are and , respectively. Find the rate of flow of water through the tube. (density of water

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

According to question, area of cross-section at and at

Let velocity of liquid flow at and at

Using equation of continuity

Now, using Bernoulli's equation

Volume flow rate

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Question (7)

QN0035615

A liquid is filled upto a height of in a cylindrical vessel. The speed of liquid coming out of a small hole at the bottom of the vessel is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Velocity of efflux

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Question (8)

QN0035616

In the diagram shown, the difference in the two tubes of the manometer is , the cross section of the tube at and is and respectively. The rate at which water flows through the tube is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

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Question (9)

QN0035617

Air flows horizontally with a speed . A house has plane roof of area . The magnitude of aerodynamic lift of the roof is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Air flows just above the roof and there is no air flow just below the roof inside the room. Therefore and . Applying Bernaulli's theorem at the points inside and outside the roof, we obtain.

Since the area of the roof is , the aerodynamic lift exerted on it

where density of air

.

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Question (10)

QN0035618

A wind with speed blows parallel to the roof of a house. The area of the roof is . Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be )

(A)
, upwards
(B)
, downwards
(C)
, upwards
(D)
, downwards

Correct Answer: B

Explanation:

According to Bernoulli's theorem,

So,

(upwards)

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Question (1)

In Bernoulli's theorem which of the following is conserved?

Explanation:

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Question (2)

A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following:

Explanation:

Link:

Question (3)

Water flows through a frictionless tube with a varying cross-section as shown in fig. Pressure at points along the axis is represented by

Explanation:

Link:

Question (4)

A wide vessel with a small hole at the bottom is filled with water (density , height ) and kerosene (density , height ). Neglecting viscosity effects, the speed with which water flows out is :

Explanation:

Link:

Question (5)

Explanation:

Link:

Question (6)

Water flows in a horizontal tube (see figure). The pressure of water changes by between and where the area of cross section are and , respectively. Find the rate of flow of water through the tube. (density of water

Explanation:

Link:

Question (7)

A liquid is filled upto a height of in a cylindrical vessel. The speed of liquid coming out of a small hole at the bottom of the vessel is

Explanation:

Link:

Question (8)

In the diagram shown, the difference in the two tubes of the manometer is , the cross section of the tube at and is and respectively. The rate at which water flows through the tube is

Explanation:

Link:

Question (9)

Air flows horizontally with a speed . A house has plane roof of area . The magnitude of aerodynamic lift of the roof is

Explanation:

Link:

Question (10)

A wind with speed blows parallel to the roof of a house. The area of the roof is . Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be )

Explanation:

Link:

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