#### Chapters

Chapter 2: Kinematics

Chapter 3: Laws of motion

Chapter 4: Work, Energy and Power

Chapter 5: Motion of System of Particles and Rigid Bodies

Chapter 6: Gravitation

Chapter 7: Properties of Matter

Chapter 8: Heat and Thermodynamics

Chapter 9: Kinetic Theory of Gases

Chapter 10: Oscillations

Chapter 11: Waves

## Chapter 7: Properties of Matter

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide Chapter 7 Properties of Matter Evaluation [Pages 90 - 93]

#### Multiple Choice Questions

Consider two wires X and Y. The radius of wire X is 3 times the radius of Y. If they are stretched by the same load then the stress on Y is ___________.

equal to that on X

thrice that on X

nine times that on X

Half that on X

If a wire is stretched to double of its original length, then the strain in the wire is __________.

1

2

3

4

The load-elongation graph of three wires of the same material as shown in the figure. Which of the following wire is the thickest?

wire 1

wire 2

wire 3

all of them have the same thickness

For a given material, the rigidity modulus is `(1/3)^"rd"` of Young’s modulus. Its Poisson’s ratio is

0

0.25

0.3

0.5

A small sphere of radius 2 cm falls from rest in a viscous liquid. Heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to

2

^{2}2

^{3}2

^{4}2

^{5}

Two wires are made of the same material and have the same volume. The area of cross-sections of the first and the second wires are A and 2A respectively. If the length of the first wire is increased by ∆l on applying a force F, how much force is needed to stretch the second wire by the same amount?

2 F

4 F

8 F

16 F

With an increase in temperature, the viscosity of liquid and gas, respectively will __________.

increase and increase

increase and decrease

decrease and increase

decrease and decrease

The Young’s modulus for a perfect rigid body is __________.

0

1

0.5

infinity

Which of the following is not a scalar?

viscosity

surface tension

pressure

stress

If the temperature of the wire is increased, then Young’s modulus will __________.

remain the same

decrease

increase rapidly

increase by very a small amount

Copper of fixed volume V is drawn into a wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is ∆l. If Y represents Young’s modulus, then which of the following graphs is a straight line?

∆l versus V

∆l versus Y

∆l versus F

∆l versus `1/"l"`

A certain number of spherical drops of a liquid of radius R coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then

energy = `4 "VT" (1/"r" - 1/"R")` is released

energy = `3 "VT" (1/"r" + 1/"R")` is absorbed

energy = `3 "VT" (1/"r" - 1/"R")` is released

energy is neither released nor absorbed

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

length = 200 cm, diameter = 0.5 mm

length = 200 cm, diameter = 1 mm

length = 200 cm, diameter = 2 mm

length = 200 cm, diameter = 3 m

The wettability of a surface by a liquid depends primarily on

viscosity

surface tension

density

angle of contact between the surface and the liquid

In a horizontal pipe of non-uniform cross-section, water flows with a velocity of 1 ms^{−1} at a point where the diameter of the pipe is 20 cm. The velocity of water (1.5 ms^{−1}) at a point where the diameter of the pipe is (in cm)

8

16

24

32

#### Short Answer Questions

Define stress.

Define strain.

State Hooke’s law of elasticity

Define Poisson’s ratio.

Explain elasticity using intermolecular forces.

Which one of these is more elastic, steel or rubber? Why?

A spring balance shows wrong readings after using it for a long time. Why?

What is the effect of temperature on elasticity?

Write down the expression for the elastic potential energy of a stretched wire.

State Pascal’s law in fluids.

State Archimedes principle.

What do you mean by upthrust or buoyancy?

State the law of floatation.

Define the coefficient of viscosity of a liquid.

Distinguish between streamlined flow and turbulent flow.

What is Reynold’s number? Give its significance.

Define terminal velocity.

Write down the expression for Stoke’s force and explain the symbols involved in it.

State Bernoulli’s theorem.

What are the energies possessed by a liquid? Write down their equations.

Two streamlines cannot cross each other. Why?

Define the surface tension of a liquid.

Mention the S.I unit and dimension of surface tension.

How is surface tension related to surface energy?

Define the angle of contact for a given pair of solid and liquid.

Distinguish between cohesive and adhesive forces.

What are the factors affecting the surface tension of a liquid?

What happens to the pressure inside a soap bubble when air is blown into it?

What do you mean by capillarity or capillary action?

A drop of oil placed on the surface of water spreads out. But a drop of water place on oil contracts to a spherical shape. Why?

State the principle and usage of the Venturimeter.

#### Long Answer Questions

State Hooke’s law and verify it with the help of an experiment.

Explain the different types of modulus of elasticity.

Derive an expression for the elastic energy stored per unit volume of a wire.

Derive an equation for the total pressure at a depth ‘h’ below the liquid surface.

State and prove Pascal’s law in fluids.

State and prove Archimedes principle.

Derive the expression for the terminal velocity of a sphere moving in a high viscous fluid using stokes force.

Derive Poiseuille’s formula for the volume of a liquid flowing per second through a pipe under streamlined flow.

Obtain an expression for the excess of pressure inside a

- liquid drop
- liquid bubble
- air bubble

What is capillarity?

Obtain an expression for the surface tension of a liquid by the capillary rise method.

Obtain an equation of continuity for a flow of fluid on the basis of conservation of mass.

State and prove Bernoulli’s theorem for a flow of incompressible, non-viscous, and streamlined flow of fluid.

Describe the construction and working of venturimeter and obtain an equation for the volume of liquid flowing per second through a wider entry of the tube.

#### Numerical Problems

A capillary of diameter d mm is dipped in water such that the water rises to a height of 30 mm. If the radius of the capillary is made `(2/3)` of its previous value, then compute the height up to which water will rise in the new capillary?

A cylinder of length 1.5 m and diameter 4 cm is fixed at one end. A tangential force of 4 × 10^{5} N is applied at the other end. If the rigidity modulus of the cylinder is 6 × 10^{10} Nm^{-2} then, calculate the twist produced in the cylinder.

A spherical soap bubble A of radius 2 cm is formed inside another bubble B of radius 4 cm. Show that the radius of a single soap bubble which maintains the same pressure difference as inside the smaller and outside the larger soap bubble is lesser than the radius of both soap bubbles A and B.

A block of Ag of mass x kg hanging from a string is immersed in a liquid of relative density 0.72. If the relative density of Ag is 10 and tension in the string is 37.12 N then compute the mass of Ag block.

The reading of the pressure meter attached with a closed pipe is 5 × 10^{5} Nm^{−2}. On opening the valve of the pipe, the reading of the pressure meter is 4.5 × 10^{5} Nm^{−2}. Calculate the speed of the water flowing in the pipe.

#### Conceptual questions

Why coffee runs up into a sugar lump (a small cube of sugar) when one corner of the sugar lump is held in the liquid?

Why two holes are made to empty an oil tin?

We can cut vegetables easily with a sharp knife as compared to a blunt knife. Why?

Why the passengers are advised to remove the ink from their pens while going up in an aeroplane?

We use the straw to suck soft drinks, why?

## Chapter 7: Properties of Matter

## Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide chapter 7 - Properties of Matter

Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide chapter 7 (Properties of Matter) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 11th Physics Volume 1 and 2 Answers Guide solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 11th Physics Volume 1 and 2 Answers Guide chapter 7 Properties of Matter are Introduction to Properties of Matter, Microscopic Understanding of Various States of Matter, Fluids, Viscous Force or Viscosity, Bernoulli's Theorem, Surface Tension.

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