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# Balbharati solutions for Physics 11th Standard Maharashtra State Board chapter 6 - Mechanical Properties of Solids [Latest edition]

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#### Chapters ## Chapter 6: Mechanical Properties of Solids

Exercises
Exercises [Pages 112 - 113]

### Balbharati solutions for Physics 11th Standard Maharashtra State Board Chapter 6 Mechanical Properties of Solids Exercises [Pages 112 - 113]

Exercises | Q 1. (i) | Page 112

Choose the correct answer.

Change in dimensions is known as _________.

• deformation

• formation

• contraction

• strain

Exercises | Q 1. (ii) | Page 112

Choose the correct answer.

The point on the stress-strain curve at which strain begins to increase even without increase in stress is called ________

• elastic point

• yield point

• breaking point

• neck point

Exercises | Q 1. (iii) | Page 112

Choose the correct answer.

Strain energy of a stretched wire is 18 × 10-3 J and strain energy per unit volume of the same wire and same cross-section is 6×10-3 J/m3. Its volume will be _________.

• 3cm3

• 3 m3

• 6 m3

• 6 cm3

Exercises | Q 1. (iv) | Page 112

Choose the correct answer.

________ is the property of a material which enables it to resist plastic deformation.

• elasticity

• plasticity

• hardness

• ductility

Exercises | Q 1. (v) | Page 112

Choose the correct answer.

The ability of a material to resist fracturing when force is applied to it, is called ______.

• toughness

• hardness

• elasticity

• plasticity

Exercises | Q 2. (i) | Page 112

Answer in one sentence.

Define elasticity.

Exercises | Q 2. (ii) | Page 112

Answer in one sentence.

What do you mean by deformation?

Exercises | Q 2. (iii) | Page 112

Answer in one sentence.

State the SI unit and dimensions of stress.

Exercises | Q 2. (iv) | Page 112

Answer in one sentence.

Define strain.

Exercises | Q 2. (v) | Page 112

Answer in one sentence.

What is Young’s modulus of a rigid body?

Exercises | Q 2. (vi) | Page 112

Answer in one sentence.

Why bridges are unsafe after very long use?

Exercises | Q 2. (vii) | Page 112

Answer in one sentence.

How should be a force applied on a body to produce shearing stress?

Exercises | Q 2. (viii) | Page 112

Answer in one sentence.

State the condition under which Hooke’s law holds good.

Exercises | Q 2. (ix) | Page 112

Answer in one sentence.

Define Poisson’s ratio.

Exercises | Q 2. (x) | Page 112

Answer in one sentence.

What is an elastomer?

Exercises | Q 2. (xi) | Page 112

Answer in one sentence.

What do you mean by elastic hysteresis?

Exercises | Q 2. (xii) | Page 112

Answer in one sentence.

State the names of the hardest material and the softest material.

Exercises | Q 2. (xiii) | Page 112

Answer in one sentence.

Define friction.

Exercises | Q 2. (xiv) | Page 112

Answer in one sentence.

Why force of static friction is known as ‘self-adjusting force’?

Exercises | Q 2. (xv) | Page 112

Answer in one sentence.

Name two factors on which the coefficient of friction depends.

Exercises | Q 3. (i) | Page 112

Answer in short.

Distinguish between elasticity and plasticity.

Exercises | Q 3. (ii) | Page 112

Answer in short.

State any four methods to reduce friction.

Exercises | Q 3. (iii) | Page 112

Answer in short.

What is rolling friction? How does it arise?

Exercises | Q 3. (iv) | Page 112

Answer in short.

Explain how lubricants help in reducing friction.

Exercises | Q 3. (v) | Page 112

Answer in short.

State the laws of static friction.

Exercises | Q 3. (vi) | Page 112

Answer in short.

State the laws of kinetic friction.

Exercises | Q 3. (vii) | Page 112

Answer in short.

State advantages of friction.

Exercises | Q 3. (viii) | Page 112

Answer in short.

State disadvantages of friction.

Exercises | Q 3. (ix) | Page 112

Answer in short.

What do you mean by brittle substance? Give any two examples.

Exercises | Q 4. (i) | Page 112

Long answer type question.

Distinguish between Young’s modulus, bulk modulus, and modulus of rigidity.

Exercises | Q 4. (ii) | Page 112

Long answer type question.

Define stress and strain. What are their different types?

Exercises | Q 4. (iii) | Page 112

Answer the following:

What is Young’s modulus?

Exercises | Q 4. (iii) | Page 112

Long answer type question.

Describe an experiment to find out Young’s modulus of the material in the form of a long string wire.

Exercises | Q 4. (iv) | Page 112

Long answer type question.

Derive an expression for strain energy per unit volume of the material of a wire.

Exercises | Q 4. (v) | Page 112

Answer in one sentence.

Define friction.

Exercises | Q 4. (v) | Page 112

Long answer type question.

Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.

Exercises | Q 4. (vi) | Page 112

Long answer type question.

State Hooke’s law.

Exercises | Q 4. (vi) | Page 112

Long answer type question.

Draw a labelled graph of tensile stress against tensile strain for a metal wire up to the breaking point. In this graph show the region in which Hooke’s law is obeyed.

Exercises | Q 5. (i) | Page 113

Answer the following.

Calculate the coefficient of static friction for an object of mass 50 kg placed on a horizontal table pulled by attaching a spring balance. The force is increased gradually, it is observed that the object just moves when spring balance shows 50 N.

Exercises | Q 5. (ii) | Page 113

Answer the following.

A block of mass 37 kg rests on a rough horizontal plane having coefficient of static friction 0.3. Find out the least force required to just move the block horizontally.

Exercises | Q 5. (iii) | Page 113

Answer the following.

A body of mass 37 kg rests on a rough horizontal surface. The minimum horizontal force required to just start the motion is 68.5 N. In order to keep the body moving with constant velocity, a force of 43 N is needed. What is the value of
i. coefficient of static friction? and
ii. coefficient of kinetic friction?

Exercises | Q 5. (iv) | Page 113

Answer the following.

A wire gets stretched by 4 mm due to a certain load. If the same load is applied to a wire of same material with half the length and double the diameter of the first wire, what will be the change in its length?

Exercises | Q 5. (v) | Page 113

Answer the following.

Calculate the work done in stretching a steel wire of length 2 m and cross-sectional area 0.0225 mm2 when a load of 100 N is slowly applied to its free end. (Young’s modulus of steel = 2 × 1011 N/m2)

Exercises | Q 5. (vi) | Page 113

Answer the following.

A solid metal sphere of volume 0.31 m3 is dropped in an ocean where water pressure is 2 × 107 N/m2. Calculate change in volume of the sphere if the bulk modulus of the metal is 6.1 × 1010 N/m2.

Exercises | Q 5. (vii) | Page 113

Answer the following.

A wire of mild steel having an initial length 1.5 m and diameter 0.60 mm gets extended by 6.3 mm when a certain force is applied to it. If Young’s modulus of mild steel is 2.1 × 1011 N/m2, calculate force applied.

Exercises | Q 5. (viii) | Page 113

Answer the following.

A composite wire is prepared by joining a tungsten wire and steel wire end to end. Both the wires are of the same length and the same area of cross-section. If this composite wire is suspended to a rigid support and a force is applied to its free end, it gets extended by 3.25 mm. Calculate the increase in the length of tungsten wire and steel wire separately.
(YTungsten = 4.1 × 1011 Pa. YSteel = 2 × 1011 Pa)

Exercises | Q 5. (ix) | Page 113

Answer the following.

A steel wire having a cross-sectional area of 1.2 mm2 is stretched by a force of 120 N. If a lateral strain of 1.455 × 10-4 is produced in the wire, calculate the Poisson’s ratio.
(Given: YSteel = 2 × 1011 N/m2)

Exercises | Q 5. (x) | Page 113

Answer the following.

A telephone wire 125 m long and 1 mm in radius is stretched to a length 125.25 m when a force of 800 N is applied. What is the value of Young’s modulus for the material of wire?

Exercises | Q 5. (xi) | Page 113

Answer the following.

A rubber band originally 30 cm long is stretched to a length of 32 cm by a certain load. What is the strain produced?

Exercises | Q 5. (xii) | Page 113

Answer the following.

What is the stress in a wire which is 50m long and 0.01 cm2 in cross-section, if the wire bears a load of 100 kg?

Exercises | Q 5. (xiii) | Page 113

Answer the following.

What is the strain in a wire cable of the original length 50 m whose length increases by 2.5 cm when a load is lifted?

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## Chapter 6: Mechanical Properties of Solids

Exercises ## Balbharati solutions for Physics 11th Standard Maharashtra State Board chapter 6 - Mechanical Properties of Solids

Balbharati solutions for Physics 11th Standard Maharashtra State Board chapter 6 (Mechanical Properties of Solids) 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 Maharashtra State Board Physics 11th Standard Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Physics 11th Standard Maharashtra State Board chapter 6 Mechanical Properties of Solids are Introduction to Mechanical Properties of Solids, Elastic Behavior of Solids, Stress and Strain, Hooke’s Law, Elastic Modulus, Stress-strain Curve, Strain Energy, Hardness, Friction in Solids.

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