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Chapters
2: Mathematical Methods
3: Motion in a Plane
4: Laws of Motion
5: Gravitation
▶ 6: Mechanical Properties of Solids
7: Thermal Properties of Matter
8: Sound
9: Optics
10: Electrostatics
11: Electric Current Through Conductors
12: Magnetism
13: Electromagnetic Waves and Communication System
14: Semiconductors
![Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board chapter 6 - Mechanical Properties of Solids - Shaalaa.com](/images/physics-english-11-standard-maharashtra-state-board_6:314f14dcb519476f83adce5380e7a92f.jpg "Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board chapter 6 - Mechanical Properties of Solids")
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Solutions for Chapter 6: Mechanical Properties of Solids
Below listed, you can find solutions for Chapter 6 of Maharashtra State Board Balbharati for Physics [English] 11 Standard Maharashtra State Board.
Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board 6 Mechanical Properties of Solids Exercises [Pages 112 - 113]
Choose the correct answer.
Change in dimensions is known as ______.
deformation
formation
contraction
strain
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
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
Choose the correct answer.
________ is the property of a material which enables it to resist plastic deformation.
elasticity
plasticity
hardness
ductility
Choose the correct answer.
The ability of a material to resist fracturing when force is applied to it, is called ______.
toughness
hardness
elasticity
plasticity
Answer in one sentence.
Define elasticity.
Answer in one sentence.
What do you mean by deformation?
Answer in one sentence.
State the SI unit and dimensions of stress.
Answer in one sentence.
Define strain.
Answer in one sentence.
What is Young’s modulus of a rigid body?
Answer in one sentence.
Why bridges are unsafe after very long use?
Answer in one sentence.
How should be a force applied on a body to produce shearing stress?
Answer in one sentence.
State the condition under which Hooke’s law holds good.
Answer in one sentence.
Define Poisson’s ratio.
Answer in one sentence.
What is an elastomer?
Answer in one sentence.
What do you mean by elastic hysteresis?
Answer in one sentence.
State the names of the hardest material and the softest material.
Answer in one sentence.
Define friction.
Answer in one sentence.
Why force of static friction is known as ‘self-adjusting force’?
Answer in one sentence.
Name two factors on which the coefficient of friction depends.
Answer in short.
Distinguish between elasticity and plasticity.
State any four methods to reduce friction.
Answer in short.
What is rolling friction? How does it arise?
Answer in short.
Explain how lubricants help in reducing friction.
Answer in short.
State the laws of static friction.
Answer in short.
State the laws of kinetic friction.
Answer in short.
State advantages of friction.
State disadvantages of friction.
Answer in short.
What do you mean by brittle substance? Give any two examples.
Long answer type question.
Distinguish between Young’s modulus, bulk modulus, and modulus of rigidity.
Long answer type question.
Define stress and strain. What are their different types?
Answer the following:
What is Young’s modulus?
Long answer type question.
Describe an experiment to find out Young’s modulus of the material in the form of a long string wire.
Long answer type question.
Derive an expression for strain energy per unit volume of the material of a wire.
Answer in one sentence.
Define friction.
Long answer type question.
Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.
Long answer type question.
State Hooke’s law.
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.
Answer the following
Calculate the coefficient of static friction for an object of mass 50 kg placed on 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.
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.
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 coefficient of static friction?
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 coefficient of kinetic friction?
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?
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)
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.
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.
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.
`("Y"_"Tungsten"= 4.1 × 10^11 "Pa, Y"_"Steel"= 2 × 10^11 "Pa")`
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 is produced in the wire, calculate the Poisson’s ratio.
(Given: YSteel = 2 × 1011 N/m2)
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?
A rubber band originally 30 cm long is stretched to a length of 32 cm by a certain load. What is the strain produced?
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?
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?
Solutions for 6: Mechanical Properties of Solids
Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board chapter 6 - Mechanical Properties of Solids
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Concepts covered in Physics [English] 11 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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