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NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Importance and Snapshot of Mechanical Properties Of Fluids - Study ref# 718

Introduction: In this chapter, we shall study some common physical properties of liquids and gases. Liquids and gases can flow and are therefore, called fluids. Fluids are everywhere around us. Earth has an envelop of air and two-t... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Importance and Snapshot of Mechanical Properties Of Fluids - Study ref# 719

Following sections must be covered to understand Mechanical Properties of Fluids: 1. Introduction 2. Pressure 3. Streamline flow 4. Bernoulli’s principle 5. Viscosity 6. Reynolds number 7. Surface tension... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Target Setup for Mechanical Properties Of Fluids - Study ref# 720

Student requires to achieve the following milestones to get better grip over Mechanical Properties Of Fluids. The milestones / targets are as follows:- Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test00... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 638

Is it difficult to stop bleeding from a cut in human body at high altitude, why? Answer: At high altitude, the atmospheric pressure is low. So, there is greater pressure difference between atmospheric pressure and blood pressure. Hence, it is difficu... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 639

Why is the dam of water reservoir thick at the bottom? Answer: The dam of water reservoir thick at the bottom because the pressure of water in reservoir increases with the depth from free surface.... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 640

If a drop of water vapour is introduced in a mercury barometer, how will the barometric height change? Answer: The height of barometer will get lowered if a drop of water is introduced in a mercury barometer, because the water vapour will also exert ... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 641

What do you mean by gauge pressure? Answer: The gauge pressure at a point in a liquid is the difference of total pressure at that point and atmospheric pressure.So, gauge pressure is  Where P is the total pressure at a point in liquid and&n... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 642

Two balls A and B have radii in the ratio 1 : 4. What will be the ratio of their terminal velocities in a liquid? Answer: Terminal velocity,  ... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 643

Water rises in a capillary tube, whereas mercury falls in the same tube, why? Answer: In capillary tube, a liquid rises to a height  h = For water,  is acute and hence h is positive. So water rises in the capillary tube. And for m... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 644

Two liquids of densities  coefficient of viscosity  are found to flow through a capillary tube at the same rate. What is the ratio of Answer: By Poiseille’s equation,  As liquid is flowing with the same rate, so &nb... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 645

The hotter liquid flows faster than the colder ones. Why? Answer: The coefficient of viscosity of liquid decreases with rise in temperature. As a result, the hotter liquid flows faster than the colder liquid under the given tangential stress.... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 646

Can two streamlines cross each other in a flowing liquid, explain. Answer: Two streamlines can never cross each other in a flowing liquid. If they do so it means that at the point of intersection of two streamlines two tangents can be drawn, that wil... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 647

What are the properties of a liquid satisfying the Bernoulli’s Theorem? Answer: The liquid must be ideal liquid i.e. non-viscous, incompressible, irrotational and its flow will be streamlined.... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 648

Water and mercury are filled in two cylindrical vessels upto same height. Both vessel have a hole in the wall near the bottom. If  are the velocity of water and mercury coming out of the holes, what will be the relation between ? Answe... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 649

Explain the effect of (i) density (ii) temperature and (iii) pressure on the viscosity of liquid and gases. Answer: i) Effect of density: for liquid, viscosity increases with increase of density and for gases, it decreases with increase in ... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 650

State Pascal’s law. Answer: Pascal’s law states that the increase in pressure at one point of the enclosed liquid in equilibrium of rest is transmitted equally to all other points of the liquid and also to the walls of the container, provided the eff... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 651

The neck and bottom of a bottle are 1 cm and 10 cm in radius respectively. If the cork is pressed with a force of 1.2 kg.f in the neck of the bottle, find the force exerted on the bottom of the bottle. Answer: So, cross sectional area,  &nb... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 652

What angle will the free surface of a liquid subtend with the horizontal when the liquid in a container is moving horizontally with constant acceleration shown in figure. Answer: Let, a horizontal liquid cylinder in liquid. Its length is L and cross-... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 653

At a depth of 1000 m in an ocean, find the absolute pressure and the gauge pressure. Given that density of sea water is , g = 10 ms-2and atmospheric pressure =  Answer: The absolute pressure at a depth of 1000 m is    &n... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 654

An ideal fluid flows through a pipe of circular cross-section with diameters 5 cm and 10 cm respectively. Find the ratio of velocities of fluid at A and B. Answer: As the fluid is idealSo by the equation of continuity     &nb... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 655

A small ball of mass m and density  is dropped in a viscous liquid of density d. After some time, the ball falls with a constant velocity. Calculate the viscous force on the ball. Answer: Volume of the ball,  Mass of liquid displa... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 656

State and prove Torricelli’s theorem. Answer: Torricelli’s theorem states that, velocity of efflux is equal to the velocity acquired by freely falling body through a vertical distance equal to the depth of orifice (i.e. narrow hole) below the free su... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 657

The viscous force F acting on a body of radius r moving with a velocity v in a medium of coefficient of viscosity  is given by . Check the correctness of the formula. Answer: Given that  F has dimension  Dimension o... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 658

Water from a tap emerges vertically downwards with an initial velocity  Assume pressure is constant throughout the stream of water and the flow is steady. For what distance from the tap the cross-sectional area of stream is half of the cros... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 659

A balloon filled with helium does not rise in air indefinitely but halts after a certain height. Explain why. Answer: A balloon filled with helium goes up in the air as long as the weight of the air displaced by it i.e. upthrust is greater than the w... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 660

Water stands at a depth H in a tank whose side walls are vertical.A hole is made at one side of the wall at a depth h below the free surface of water.a) At what distance s from the foot of the wall does the emerging stream of water strike the floor?b... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 661

In a test experiment on a model Aeroplane in a wind tunnel, the flow speeds on the lower and upper surfaces of the wing are v and v respectively. If the density of air is  and the surface area of the wing is A, what is the dynamic lift... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 662

Calculate the minimum pressure required to force the blood from the heart to the top of the head (vertical distance = 40 cm). Assume the density of blood to be 1.04 g cm-3. Friction is to be neglected. Answer: Here     &nb... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 663

Eight spherical rain drops of equal size are falling vertically trough air with a terminal velocity of 0.01 ms-1. What should be the velocity if these drops were to combine to form one large spherical drop? Answer: Let r is the radius of each small d... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 664

An air bubble of density 1 kg m-3 and diameter 0.6 mm is rising in a liquid of viscosity 0.15 Nm-2 and of specific gravity 0.9. Find the terminal velocity of the air bubble. Answer: Here           r =... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 665

A circular metal plate of radius 6 cm is at rest on a layer of caster oil of thickness 1.5 mm and coefficient of viscosity 15.5 poise. Find the horizontal force (in kg-f) required to move the plate with a speed of 6 cm/s. Answer: Radius r = 6 cm,&nbs... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 666

A tube of mercury barometer is 4 mm in diameter. How much error does the surface tension cause in the reading? Surface tension of mercury =  angle of contact =  and density of mercury = . Answer: Diameter = 4 mmSo, radius =&n... read more

NEET - Grade 11 - Physics - Mechanical Properties of Fluids - Study ref# 667

Find the work done in blowing a soap bubble of surface tension 0.07 Nm-1 from 2 cm radius to 5 cm radius. Answer: Initial surface area of the bubble     Final surface area of the bubble      &nbs... read more

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