Tamil Nadu Board of Secondary EducationHSC Science Class 11th

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

## Chapter 7: Properties of Matter

Evaluation
Evaluation [Pages 90 - 93]

### 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

Evaluation | Q I. 1. | Page 90

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

Evaluation | Q I. 2. | Page 90

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

• 1

• 2

• 3

• 4

Evaluation | Q I. 3. | Page 90

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

Evaluation | Q I. 4. | Page 90

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

Evaluation | Q I. 5. | Page 90

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

• 22

• 23

• 24

• 25

Evaluation | Q I. 6. | Page 90

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

Evaluation | Q I. 7. | Page 90

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

Evaluation | Q I. 8. | Page 90

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

• 0

• 1

• 0.5

• infinity

Evaluation | Q I. 9. | Page 91

Which of the following is not a scalar?

• viscosity

• surface tension

• pressure

• stress

Evaluation | Q I. 10. | Page 91

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

Evaluation | Q I. 11. | Page 91

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"

Evaluation | Q I. 12. | Page 91

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

Evaluation | Q I. 13. | Page 91

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

Evaluation | Q I. 14. | Page 91

The wettability of a surface by a liquid depends primarily on

• viscosity

• surface tension

• density

• angle of contact between the surface and the liquid

Evaluation | Q I. 15. | Page 91

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

Evaluation | Q II. 1. | Page 91

Define stress.

Evaluation | Q I. 2. | Page 91

Define strain.

Evaluation | Q II. 2. | Page 91

State Hooke’s law of elasticity

Evaluation | Q II. 3. | Page 91

Define Poisson’s ratio.

Evaluation | Q II. 4. | Page 91

Explain elasticity using intermolecular forces.

Evaluation | Q II. 5. | Page 91

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

Evaluation | Q II. 6. | Page 92

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

Evaluation | Q II. 7. | Page 92

What is the effect of temperature on elasticity?

Evaluation | Q II. 8. | Page 92

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

Evaluation | Q II. 9. | Page 92

State Pascal’s law in fluids.

Evaluation | Q II. 10. | Page 92

State Archimedes principle.

Evaluation | Q II. 11. | Page 92

What do you mean by upthrust or buoyancy?

Evaluation | Q II. 12. | Page 92

State the law of floatation.

Evaluation | Q II. 13. | Page 92

Define the coefficient of viscosity of a liquid.

Evaluation | Q II. 14. | Page 92

Distinguish between streamlined flow and turbulent flow.

Evaluation | Q II. 15. | Page 92

What is Reynold’s number? Give its significance.

Evaluation | Q II. 16. | Page 92

Define terminal velocity.

Evaluation | Q II. 17. | Page 92

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

Evaluation | Q II. 18. | Page 92

State Bernoulli’s theorem.

Evaluation | Q II. 19. | Page 92

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

Evaluation | Q II. 20. | Page 92

Two streamlines cannot cross each other. Why?

Evaluation | Q II. 21. | Page 92

Define the surface tension of a liquid.

Evaluation | Q II. 21. | Page 92

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

Evaluation | Q II. 22. | Page 92

How is surface tension related to surface energy?

Evaluation | Q II. 23. | Page 92

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

Evaluation | Q II. 24. | Page 92

Distinguish between cohesive and adhesive forces.

Evaluation | Q II. 25. | Page 92

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

Evaluation | Q II. 26. | Page 92

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

Evaluation | Q II. 27. | Page 92

What do you mean by capillarity or capillary action?

Evaluation | Q II. 28. | Page 92

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?

Evaluation | Q II. 29. | Page 92

State the principle and usage of the Venturimeter.

Evaluation | Q III. 1. | Page 92

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

Evaluation | Q III. 2. | Page 92

Explain the different types of modulus of elasticity.

Evaluation | Q III. 3. | Page 92

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

Evaluation | Q III. 4. | Page 92

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

Evaluation | Q III. 5. | Page 92

State and prove Pascal’s law in fluids.

Evaluation | Q III. 6. | Page 92

State and prove Archimedes principle.

Evaluation | Q III. 7. | Page 92

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

Evaluation | Q III. 8. | Page 92

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

Evaluation | Q III. 9. | Page 92

Obtain an expression for the excess of pressure inside a

1. liquid drop
2. liquid bubble
3. air bubble
Evaluation | Q III. 10. a. | Page 92

What is capillarity?

Evaluation | Q III. 10. b. | Page 92

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

Evaluation | Q III. 11. | Page 92

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

Evaluation | Q III. 12. | Page 93

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

Evaluation | Q III. 13. | Page 93

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

Evaluation | Q IV. 1. | Page 93

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?

Evaluation | Q IV. 2. | Page 93

A cylinder of length 1.5 m and diameter 4 cm is fixed at one end. A tangential force of 4 × 105 N is applied at the other end. If the rigidity modulus of the cylinder is 6 × 1010 Nm-2 then, calculate the twist produced in the cylinder.

Evaluation | Q IV. 3. | Page 93

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.

Evaluation | Q IV. 4. | Page 93

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.

Evaluation | Q IV. 5. | Page 93

The reading of the pressure meter attached with a closed pipe is 5 × 105 Nm−2. On opening the valve of the pipe, the reading of the pressure meter is 4.5 × 105 Nm−2. Calculate the speed of the water flowing in the pipe.

#### Conceptual questions

Evaluation | Q V. 1. | Page 93

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?

Evaluation | Q V. 2. | Page 93

Why two holes are made to empty an oil tin?

Evaluation | Q V. 3. | Page 93

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

Evaluation | Q V. 4. | Page 93

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

Evaluation | Q V. 5. | Page 93

We use the straw to suck soft drinks, why?

Evaluation

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

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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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