# Frank solutions for Class 9 Physics ICSE chapter 5 - Heat [Latest edition]

#### Chapters ## Chapter 5: Heat

ExerciseThermal ExpansionThermometryTransmission of Heat
Exercise [Page 191]

### Frank solutions for Class 9 Physics ICSE Chapter 5 Heat Exercise [Page 191]

Exercise | Q 1 | Page 191

What do you mean by heat?

Exercise | Q 2 | Page 191

Is heat a form of energy?

Exercise | Q 3 | Page 191

Name the SI unit of heat.

Exercise | Q 4 | Page 191

Define one joule of heat.

Exercise | Q 5 | Page 191

What is the relation between joule and calorie?

Exercise | Q 6 | Page 191

Define temperature and write its SI unit.

Exercise | Q 7 | Page 191

Why does a piece of ice when touched with hands appear cold?

Exercise | Q 8 | Page 191

Distinguish between heat and temperature.

Exercise | Q 9 | Page 191

Two bodies at different temperatures are placed in contact with each other. State the direction in which heat flows.

Exercise | Q 10 | Page 191

Is it correct to say that heat is the cause of temperature?

Exercise | Q 11 | Page 191

What causes a change in the temperature of a body?

Exercise | Q 12 | Page 191

Which is more, a calorie or a joule?

Exercise | Q 13 | Page 191

1 joule = 4.2 calorie
Is this relation correct?

Exercise | Q 14 | Page 191

Two bodies are at same temperature. Do they necessarily contain same amount of heat?

Thermal Expansion, Exercise [Pages 202 - 203]

### Frank solutions for Class 9 Physics ICSE Chapter 5 Heat Thermal Expansion, Exercise [Pages 202 - 203]

Thermal Expansion | Q 1.1 | Page 202

Define coefficient of linear expansion.

Thermal Expansion | Q 1.2 | Page 202

Define the following term:

Coefficient of superficial expansion

Thermal Expansion | Q 1.3 | Page 202

Define the following term:

Coefficient of cubical expansion

Thermal Expansion | Q 2 | Page 202
State the relation between the three types of expansion.
Thermal Expansion | Q 3.1 | Page 202

What is a bimetallic strip?

Thermal Expansion | Q 3.2 | Page 202

What is the criterion of choosing the two metals for a bimetal strip?

Thermal Expansion | Q 3.3 | Page 202

Give two uses of a bimetal strip.

Exercise | Q 4 | Page 202

A bimetal strip is shown in the below diagram before heating. Draw a diagram to show how it bends on heating and on cooling. Thermal Expansion | Q 5.1 | Page 202

What is a thermostat

Thermal Expansion | Q 5.2 | Page 202

Give two uses of the thermostat.

Thermal Expansion | Q 6 | Page 202
Explain the 'anomalous expansion' of water.
Thermal Expansion | Q 7 | Page 202
What properties of water slow down the complete freezing of the water in the lake?
Thermal Expansion | Q 8 | Page 202

A round bottom flask containing coloured water, filtered with a stopper and a narrow glass tube is shown in the following diagram. What will happen to the water level X marked in the tube when it is placed in a hot water bath? Give a reason for your answer. Thermal Expansion | Q 9.1 | Page 202

Give reasons for the following:

When boiling water is poured into a glass bottle, it generally cracks.

Thermal Expansion | Q 9.2 | Page 202

Give reasons for the following:

Telephone wires sag in summer.

Thermal Expansion | Q 9.3 | Page 202

Give reasons for the following:

In cold countries, water pipes burst in winter.

Thermal Expansion | Q 9.4 | Page 202

Give reasons for the following:

Even when the water in the lakes is frozen, fish can survive.

Thermal Expansion | Q 10 | Page 202

What will be the approximate temperature of water in the lake shown in the following diagram? (i) At X, and
(ii) At Y?

Thermal Expansion | Q 11 | Page 202

The diagram shows a sketch graph showing a change in volume of a given mass of ice at -5°C to water at 15°C. (i) Why does the temperature along BC remain constant?

(ii) When is the volume of water minimum?

(iii) At what temperature does water have maximum density? Explain.

Thermal Expansion | Q 12.1 | Page 203

Complete the following sentence:

The density of water is______. At 4°C.

Thermal Expansion | Q 12.2 | Page 203

Complete the following sentence:

When ice melts its volume ______ and density _______.

Thermal Expansion | Q 12.3 | Page 203

Complete the following sentence:

In a bimetal two metals of different _______ of _______ are used.

Thermal Expansion | Q 12.4 | Page 203

Complete the following sentence:

Water pipes burst in winter in very cold countries is due to ________

Thermal Expansion | Q 12.5 | Page 203

Complete the following sentence:

CGS units of heat is _________

Thermal Expansion | Q 12.6 | Page 203

Complete the following sentence:

SI unit of temperature is ______

Thermal Expansion | Q 13 | Page 203
A glass stopper has got stuck in the neck of a bottle. How can you remove the stopper without breaking the bottle?
Thermal Expansion | Q 14 | Page 203
What is meant by apparent expansion and real expansion of a liquid?
Thermal Expansion | Q 15 | Page 203
Equal volumes of alcohol and mercury are heated uniformly in identical containers separately from 10°C to 50°C. Will both the liquids occupy the same volume? Give reason.
Thermal Expansion | Q 16 | Page 203
How will you demonstrate thermal expansion in liquids? Describe an experiment.
Thermal Expansion | Q 17 | Page 203
Describe an experiment to demonstrate thermal expansion in gases.
Thermal Expansion | Q 18 | Page 203
Why does a hot glass chimney often crack when a drop of waterfalls on it?
Thermal Expansion | Q 19 | Page 203
Can we fuse an iron wire in a glass rod? Give reason to your answer.
Thermal Expansion | Q 20 | Page 203
Suggest some suitable way to remove a tight glass stopper from a bottle.
Thermal Expansion | Q 21 | Page 203
Name two substances which expand on heating.
Thermal Expansion | Q 22 | Page 203
Name two substances which expand on heating.
Thermal Expansion | Q 23 | Page 203
Describe an experiment to demonstrate the thermal expansion of solids.
Thermal Expansion | Q 24 | Page 203
The joins in metal pipes become loose in summer. Why?
Thermal Expansion | Q 25 | Page 203
State three factors on which the increase in the length of a rod depends, on heating.
Thermal Expansion | Q 26 | Page 203
'The coefficient of linear expansion for metal is 0.000016 per °C'. Explain the meaning of the statement.
Thermal Expansion | Q 27 | Page 203

The following figure shows a copper washer. Explain, giving reasons, whether the following characteristics of the washer increase, decrease, or remain the same when it is heated. (a) Internal diameter
(b) Volume
(c) Mass
(d) Density
(e) External diameter

Thermal Expansion | Q 28 | Page 203
Show by an experiment that the real expansion of a liquid is equal to the sum of its apparent expansion of a liquid is equal to the sum of its apparent expansion and the volume expansion of the vessel containing the liquid.
Thermal Expansion | Q 29 | Page 203
At what temperature the density of water is maximum?
Thermal Expansion | Q 30 | Page 203
State the volume changes that you will observe when a given mass of water is heated from 0°C to 10°C. Sketch a temperature-volume graph to show the behavior.
Thermometry [Pages 209 - 210]

### Frank solutions for Class 9 Physics ICSE Chapter 5 Heat Thermometry [Pages 209 - 210]

Thermometry | Q 1 | Page 209

What do you mean by temperature?

Thermometry | Q 2 | Page 209
Name the instrument used for measuring the temperature of a body.
Thermometry | Q 3 | Page 209
What is the principle used in a thermometer?
Thermometry | Q 4 | Page 209
What is meant by the range of a thermometer?
Thermometry | Q 5 | Page 209
Name the liquid used in a clinical thermometer.
Thermometry | Q 6 | Page 209
What is the usual range of temperature marked on a clinical thermometer?
Thermometry | Q 7 | Page 209
Who designed the first thermometer?
Thermometry | Q 8 | Page 209
What do you mean by calibration of a thermometer?
Thermometry | Q 9 | Page 209
What is a clinical thermometer?
Thermometry | Q 10 | Page 209
State three properties of a liquid which make it suitable to be used in a thermometer.
Thermometry | Q 11 | Page 209
State two disadvantages of using mercury as a thermometric liquid.
Thermometry | Q 12 | Page 209
State three advantages of using mercury in a thermometer liquid.
Thermometry | Q 13 | Page 209
State two disadvantages of using water as a thermometric liquid.
Thermometry | Q 14 | Page 209
Express 0°C in Kelvin.
Thermometry | Q 15 | Page 209
The body temperature of a healthy person is 98.4°F. Find the corresponding temperature on the Celsius scale.
Thermometry | Q 16 | Page 209
The temperature of a body rises through 1°C. What is the corresponding rise on an absolute scale?
Thermometry | Q 17 | Page 209
Name the temperature scale used in the SI system.
Thermometry | Q 18 | Page 209
How is the size of a degree defined on the Celsius scale?
Thermometry | Q 19 | Page 209
Convert -15°C on the Fahrenheit scale.
Thermometry | Q 20 | Page 209
What is absolute zero on the Celsius Scale?
Thermometry | Q 21 | Page 209
The temp. of two bodies differ by 1°C. What is the difference on the Fahrenheit scale of temperature?
Thermometry | Q 22 | Page 209
Who invented Celsius scale of temperature?
Thermometry | Q 23 | Page 209
Who invented the Fahrenheit scale of temperature?
Thermometry | Q 24 | Page 209
Name two liquid thermometers that are commonly used.
Thermometry | Q 25 | Page 210
Name two animals which are able to increase their body temperature in summers and decrease their body temperature in winters.
Thermometry | Q 26 | Page 210
Name the CGS unit of heat. Define it.
Thermometry | Q 27 | Page 210
Plot a graph taking °C on the Y-axis and the corresponding °F along the X-axis.
Thermometry | Q 28 | Page 210
Plot a graph taking °C on the Y-axis and the corresponding °F along the X-axis.
Thermometry | Q 29 | Page 210
Write the relationship between the Celsius and Fahrenheit scales of temperature.
Thermometry | Q 30 | Page 210
State the temperature of the ice point and steam point on the Fahrenheit scale.
Transmission of Heat [Pages 226 - 229]

### Frank solutions for Class 9 Physics ICSE Chapter 5 Heat Transmission of Heat [Pages 226 - 229]

Transmission of Heat | Q 1 | Page 226
State three models of transfer of heat.
Transmission of Heat | Q 2 | Page 226

Define the process of conduction.

Transmission of Heat | Q 3 | Page 226

Is conduction possible in vacuum?

Transmission of Heat | Q 4 | Page 226
What is meant by thermal insulation?
Transmission of Heat | Q 5 | Page 226
What is the main difference between good and bad conductors of heat?
Transmission of Heat | Q 6 | Page 226
Are liquids good conductors of heat?
Transmission of Heat | Q 7.1 | Page 226

Out of metals, liquids, and gases:

Which one is the best conductor of heat?

Transmission of Heat | Q 7.2 | Page 226

Out of metals, liquids, and gases:

Which one is worst conductor of heat?

Transmission of Heat | Q 8 | Page 226
Name the metal which is most conducting.
Transmission of Heat | Q 9 | Page 226
Name the substance which is most non-conducting.
Transmission of Heat | Q 10 | Page 226
Is air a good conductor of heat?
Transmission of Heat | Q 11 | Page 226
Among solids ebonite and asbestos are the worst conductors of heat. Is it a correct statement?
Transmission of Heat | Q 12 | Page 226
Why are cooking utensils made of metals?
Transmission of Heat | Q 13 | Page 226
Why are hollow bricks used in the construction of cold storage rooms?
Transmission of Heat | Q 14 | Page 226
Name a liquid which is a good conductor of heat.
Transmission of Heat | Q 15 | Page 226

Why in cold countries windows have two glass panes with a thin layer
Of air between them?

Transmission of Heat | Q 16 | Page 226
Arrange the following in order of increasing heat conductivity: copper, air water, mercury.
Transmission of Heat | Q 17.1 | Page 229

Explain the following:
Water is heated generally from below.

Transmission of Heat | Q 17.2 | Page 226

Explain the following:
In a solid, heat is not transferred by the process of convection.

Transmission of Heat | Q 17.3 | Page 226

Explain the following:
Conduction is not possible in vacuum.

Transmission of Heat | Q 17.4 | Page 226

Explain the following:
Why is the cooling in a refrigerator kept near the top?

Transmission of Heat | Q 17.5 | Page 226

Explain the following:
It is cool in the shade, when it is hot outside.

Transmission of Heat | Q 18 | Page 226

The following figure shows a rectangular box with two tubes P and Q at the top. A burning candle R is placed under the tube P. The candle burns brightly. Explain:

(i) How is the air in the box circulating?
(ii) What will happen if the opening Q is closed?

Transmission of Heat | Q 19 | Page 226

The following figure shows a container in which a lighted candle has been kept. The container has two openings, p, and Q. Which way the smoke from an external source placed near P moves when it reaches P and leaves from Q. Give a reason for your answer. Transmission of Heat | Q 20 | Page 227
Name the process by which we receive heat from the sun.
Transmission of Heat | Q 21 | Page 227
How can the radiating power of a surface be increased?
Transmission of Heat | Q 22 | Page 227
At what speed does the heat radiation travel? What path does it follow?
Transmission of Heat | Q 23 | Page 227
Draw a labeled diagram of a vacuum flask and explain how the heat transfer minimized in it.
Transmission of Heat | Q 24.1 | Page 227

What is a greenhouse?

Transmission of Heat | Q 24.2 | Page 227

How does the air inside the greenhouse remain warm?

Transmission of Heat | Q 25 | Page 227
Describe an experiment to show that a blackened surface is a better emitter of heat than a polished surface.
Transmission of Heat | Q 26.1 | Page 227

How will you minimize heat loss due to the following:

Convection

Transmission of Heat | Q 26.2 | Page 227

How will you minimize heat loss due to the following:

Conduction

Transmission of Heat | Q 26.3 | Page 227

How will you minimize heat loss due to the following:

Transmission of Heat | Q 27.1 | Page 227

A red hot ball is suspended from the ceiling of a room using a thin metallic wire.

Name the ways in which the ball loses heat.

Transmission of Heat | Q 27.2 | Page 227

A red hot ball is suspended from the ceiling of a room using a thin metallic wire.

Suggest the way by which it loses the least amount of heat.

Transmission of Heat | Q 27.3 | Page 227

A red hot ball is suspended from the ceiling of a room using a thin metallic wire.

Explain what role does the air in the room play in the loss of heat.

Transmission of Heat | Q 28.1 | Page 227

Explain the term CFCs.

Transmission of Heat | Q 28.2 | Page 227

Explain the term UV.

Transmission of Heat | Q 28.3 | Page 227

Explain the term WHO.

Transmission of Heat | Q 29 | Page 227
What are greenhouse gases?
Transmission of Heat | Q 30 | Page 227
Name any three greenhouse gases.
Transmission of Heat | Q 31 | Page 227
Why extensive use of fossil fuels should not be made?
Transmission of Heat | Q 32 | Page 227

Define global warming.

Transmission of Heat | Q 33 | Page 227
What are the expected effects of global warming?
Exercise [Pages 229 - 232]

### Frank solutions for Class 9 Physics ICSE Chapter 5 Heat Exercise [Pages 229 - 232]

Exercise | Q 1 | Page 229

What do you mean by temperature?

Exercise | Q 2 | Page 229

What is the normal temperature of human body?

Exercise | Q 3 | Page 229

Convert 20°C into Fahrenheit scale.0

Exercise | Q 4 | Page 229

What is the upper fixed point on the Celsius scale?

Exercise | Q 5 | Page 229

Convert 80 K temperatures on the Celsius scale.

Exercise | Q 6 | Page 229

Write down the SI unit of latent heat.

Exercise | Q 7 | Page 229
What do you mean by relative humidity?
Exercise | Q 8 | Page 229

Define coefficient of linear expansion. Write its SI unit.

Exercise | Q 9 | Page 229

Name the scientist who designed the first thermometer.

Exercise | Q 10 | Page 229

What is the principle of calorimetry?

Exercise | Q 11 | Page 229

Write the SI unit of coefficient of cubical expansion.

Exercise | Q 12 | Page 229

State two uses of a bimetallic strip.

Exercise | Q 13 | Page 229

Why do telephone wires sag during summer?

Exercise | Q 14 | Page 229

State the types of thermal expansion. What is the relation between α and γ?

Exercise | Q 15 | Page 229

Do all substances expand on heating? Give examples.

Exercise | Q 16 | Page 229

What is evaporation? Why does it cause cooling?

Exercise | Q 17 | Page 229

State three factors affecting evaporation.

Exercise | Q 18 | Page 229

What are land and sea breezes? Explain with the help of a labeled diagram.

Exercise | Q 19 | Page 229

Is conduction possible in gases?

Exercise | Q 20 | Page 229

Is conduction possible in vacuum?

Exercise | Q 21 | Page 229

What is the velocity of thermal radiations?

Exercise | Q 22 | Page 230

Why do we wear woolen clothes in winter?

Exercise | Q 23 | Page 230

Why is a newly made quit warmer than an old one?

Exercise | Q 24 | Page 230

In cold countries, the water pipes are covered with poor conductors. Why?

Exercise | Q 25 | Page 230

Name three devices which are used to detect heat radiations.

Exercise | Q 26 | Page 230

What is meant by thermal expansion?

Exercise | Q 27 | Page 230

What do you mean by linear expansion?

Exercise | Q 28 | Page 230

Define coefficient of linear expansion.

Exercise | Q 29 | Page 230

What is a bimetallic strip?

Exercise | Q 30 | Page 230

What is the unit of coefficient of linear expansion?

Exercise | Q 31 | Page 230

Name the substance which contracts when heated from 00C to 40C.

Exercise | Q 32 | Page 230

Define coefficient of volume expansion.

Exercise | Q 33 | Page 230

What is the unit of coefficient of volume expansion?

Exercise | Q 34 | Page 230

State two uses of a bimetallic strip.

Exercise | Q 35 | Page 230

How can a glass stopper jammed in the neck of a bottle be removed?

Exercise | Q 36 | Page 230

Why does a thick glass tumbler crack when very hot water is poured in it?

Exercise | Q 37 | Page 230

Why does a substance expand on heating?

Exercise | Q 38 | Page 230

What are the different types of thermal expansions?

Exercise | Q 39 | Page 230

A small gap is left between two iron rails of the railway track. Why?

Exercise | Q 40 | Page 230

Why are bridges made of steel girders put on rollers?

Exercise | Q 41 | Page 230

What is the relation between α and γ?

Exercise | Q 42 | Page 230

A copper wire 10 cm long is heated from 200C to 300C. Find the increase in length of the wire, if coefficient of linear expansion of copper is 1.7 X 10-5oC-1

Exercise | Q 43 | Page 230

One liter of mercury at 100C is heated to 300C. Find the increase in the volume of mercury. The coefficient of cubical expansion of mercury is 1.8 X 10-4 0C-1.

Exercise | Q 44 | Page 230

Why is a ventilator provided in a room?

Exercise | Q 45 | Page 230

Is it possible to heat a liquid or gas from above? Explain your answer.

Exercise | Q 46.1 | Page 230

Explain the following:
Water is heated generally from below.

Exercise | Q 46.2 | Page 230

Explain the following:
Land becomes warmer than water during the day.

Exercise | Q 47 | Page 230

State three main characteristics of a thermometric substance.

Exercise | Q 48 | Page 230

Name a substance which is an insulator of heat.

Exercise | Q 49.1 | Page 230

Why in cold countries windows have two glass panes with a thin layer
Of air between them?

Exercise | Q 49.2 | Page 230

What is the relation between joule and calorie?

Exercise | Q 49.3 | Page 230

Is it possible to boil water in a thin paper container? Explain with a reason.

Exercise | Q 50 | Page 230

What is the principle of the thermometer?

Exercise | Q 51 | Page 230

State the advantages and disadvantages of mercury and alcohol as thermometric liquids.

Exercise | Q 52 | Page 230

What is meant by the lower and upper fixed points of a thermometer?

Exercise | Q 53 | Page 230

Draw a neat and labeled diagram of a clinical thermometer

Exercise | Q 54.1 | Page 230

State one use of each of the following type of thermometer:
Laboratory thermometer

Exercise | Q 54.2 | Page 230

State one use of each of the following type of thermometer:
Clinical thermometer

Exercise | Q 54.3 | Page 230

State one use of each of the following type of thermometer:
Six's maximum and minimum thermometer.

Exercise | Q 55 | Page 230

Distinguish between a clinical and a laboratory thermometer.

Exercise | Q 56 | Page 230
Which is the temperature that is common in the Celsius and the Fahrenheit scale?
Exercise | Q 57.1 | Page 230

Convert the following temperature into Fahrenheit scale:
600C

Exercise | Q 57.2 | Page 230

Convert the following temperature into Fahrenheit scale:
1000C

Exercise | Q 57.3 | Page 230

Convert the following temperature into Fahrenheit scale:
-400C

Exercise | Q 57.4 | Page 230

Convert the following temperature into Fahrenheit scale:
850C.

Exercise | Q 58.1 | Page 230

Convert the following temperature into Celsius scale:
104oF

Exercise | Q 58.2 | Page 230

Convert the following temperature into Celsius scale:
95oF

Exercise | Q 58.3 | Page 230

Convert the following temperature into Celsius scale:
113oF

Exercise | Q 58.4 | Page 230

Convert the following temperature into Celsius scale:
32oF

Exercise | Q 59 | Page 230

Draw a neat and labeled diagram of a Six's maximum and minimum thermometer. Explain briefly, the working of this thermometer. Give a use of this thermometer.

Exercise | Q 60 | Page 230

Explain the three modes of transfer of heat.

Exercise | Q 61 | Page 230
With the help of a diagram, show that water is a bad conductor of heat.
Exercise | Q 62 | Page 230
Write a short note on Land Breeze and Sea Breeze.
Exercise | Q 63 | Page 230
A wooden knob and a metal latch on a door are both at room temperatures. Explain, why the latch is colder to touch.
Exercise | Q 64 | Page 230
Draw a neat and labeled diagram of a vacuum flask (thermos flask). Explain, how it minimizes loss of heat by preventing conduction, convection, and radiation.
Exercise | Q 65 | Page 230

A spiral cut from a thick chart paper is pivoted at 0 and is held slightly above a burning candle You will notice that the spiral starts moving. Explain. Exercise | Q 66.1 | Page 230

Give a scientific reason for the following:
In winter the human body covered with a blanket keeps warm.

Exercise | Q 66.2 | Page 230

Give a scientific reason for the following:
It is better to use thin blankets to keep the body warm rather than using a single blanket of thickness equal to their combined thickness.

Exercise | Q 66.3 | Page 230

Give a scientific reason for the following:
In winter the birds fluff up their feathers.

Exercise | Q 66.4 | Page 230

Give a scientific reason for the following:
Old quits are less warm than the new ones.

Exercise | Q 66.5 | Page 230

Give a scientific reason for the following:
On a hot sunny day, it is advisable to wear light coloured clothes.

Exercise | Q 67 | Page 231
What is meant by energy flow?
Exercise | Q 68 | Page 231
Draw a flow chart to establish that the transfer of the sun's energy in a sun-eco system combination is not cyclic.
Exercise | Q 69 | Page 231
State reason why any energy transfer cannot be 100%.
Exercise | Q 70 | Page 231
State briefly the functioning of a biogas power-source.
Exercise | Q 71 | Page 231

The diagram in the following shows two air filled bulbs connected by a U-tube containing mercury kept equidistant from a glassing bulb.

(i) Explain, how will the level X and Y change? (ii) Give a reason for your answer. Exercise | Q 72 | Page 231

The following diagrams illustrate three situations involving thermometers which are labeled A, Band C. In each situation the thermometers indicate different readings.

(i) What do you expect the approximate reading of the thermometer B and C would be? Give a reason for your answer. Exercise | Q 73 | Page 231

The hot metal ball is suspended from a string in a metal box as shown in the following figure

(i) What are the ways in which the ball loses heat

(ii) Which side of the box will be the hottest and which the least hot after some time? Explain. Exercise | Q 74 | Page 231

The following figure shows a metal cylinder, containing boiling water. One half side A is polished and another half, B is painted black. Two thin metal sheets X and Y are painted black and have one rubber stopper fixed with wax on each sheet. These sheets are equidistant from the boiling water (container A, B) as shown in the diagram. What would you expect to happen after a few minutes? Give a reason for your answer. Exercise | Q 75 | Page 232
Distinguish between Mercury and Alcohol as a thermometric liquid.
Exercise | Q 76 | Page 232
Water is not used as a thermometric liquid. Why?
Exercise | Q 77 | Page 232
How can you increase the sensitivity of a thermometer?
Exercise | Q 78.1 | Page 232

Explain the following:

Why a thick glass tumbler is likely to crack when hot water is poured in it?

Exercise | Q 78.2 | Page 232

Explain the following:

Why does not a Pyrex tumbler crack when hot water is poured in it?

Exercise | Q 79 | Page 232
Water at 0°C is heated to 10°C. Sketch a temperature-volume graph to show the behavior of heating.
Exercise | Q 80 | Page 232
Differentiate between clinical thermometer and laboratory thermometer.
Exercise | Q 81 | Page 232

Study the following diagrams and write down your observations. Exercise | Q 82 | Page 232
The temperature of two bodies A and B differ by 1°C. By how much will it differ on a Fahrenheit scale?
Exercise | Q 83 | Page 232
On a faulty thermometer, a lower fixed point is marked at 10°C and upper fixed point is marked as 130°C. What will be the reading on this thermometer when it is placed in a liquid which is actually at 40°C?
Exercise | Q 84 | Page 232
What is the greenhouse effect?
Exercise | Q 85 | Page 232
How global warming occurs?
Exercise | Q 86 | Page 232
What are the harmful effects of global warming?
Exercise | Q 87 | Page 232
What is the reason behind the rising temperature inside a greenhouse?

## Chapter 5: Heat

ExerciseThermal ExpansionThermometryTransmission of Heat ## Frank solutions for Class 9 Physics ICSE chapter 5 - Heat

Frank solutions for Class 9 Physics ICSE chapter 5 (Heat) 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 CISCE Class 9 Physics ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 9 Physics ICSE chapter 5 Heat are Expansion of Solids, Hope’s Experiment to Demonstrate the Anomalous Expansion of Water, Consequences of Anomalous Expansion of Water, Energy Flow in an Ecosystem, Application of Laws of Thermodynamics in Energy Flow, Conventional Sources of Energy and Non-conventional Sources of Energy, Solar Energy, Solar Energy Devices, Hydroelectric Energy, Bio-energy, Anomalous Expansion of Water, Source of Energy, Wind Energy, Energy from the Sea, Heat and Its Unit, Temperatures, Expansion of Substances (Thermal Expansion), Geothermal Energy, Nuclear Energy, Conservation of Coal, Petroleum, and Natural Resources, Energy Degradation, Conservation and Judicious Use of Resources, Green House Effect, Preventive Measures of Green House Effect, Global Warming, Preventive Measures of Global Warming, Future Predictions of Global Warming, Expansion of Liquids, Expansion of Gases.

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