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Selina solutions for Concise Physics Class 7 ICSE chapter 5 - Heat [Latest edition]

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Concise Physics Class 7 ICSE - Shaalaa.com

Chapter 5: Heat

Objective QuestionsShort/Long Answer QuestionsNumericals

Objective Questions

Selina solutions for Concise Physics Class 7 ICSE Chapter 5 Heat Objective Questions

Objective Questions | Q 1.01

Write true or false for a given statement.

On touching a lump of ice, we feel cold because some heat passes from our body to the ice.

  • True

  • False

Objective Questions | Q 1.02

Write true or false for a given statement.

Heat flows from a body at a high temperature to a body at a low temperature when they are kept in contact. 

  • True

  • False

Objective Questions | Q 1.03

Write true or false for a given statement.

All solids expand by the same amount when heated to the same rise in temperature.

  • True

  • False

Objective Questions | Q 1.04

Write true or false for a given statement.

Telephone wires are kept tight between the two poles in summer.

  • True

  • False

Objective Questions | Q 1.05

Write true or false for a given statement.

Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.

  • True

  • False

Objective Questions | Q 1.06

Write true or false for a given statement.

Solids expand the least and gases expand the most on being heated.

  • True

  • False

Objective Questions | Q 1.07

Write true or false for a given statement.

A mercury thermometer makes use of the property of the expansion of liquids on heating.

  • True

  • False

Objective Questions | Q 1.08

Write true or false for a given statement.

Kerosene contracts on heating.

  • True

  • False

Objective Questions | Q 1.09

Write true or false for a given statement.

Water is a bad conductor of heat.

  • True

  • False

Objective Questions | Q 1.1

Write true or false for a given statement.

Medium is necessary for the transfer of heat by radiation.

  • True

  • False

Objective Questions | Q 1.11

Write true or false for a given statement.

Land and sea breezes are convection currents of cold and warm air.

  • True

  • False

Objective Questions | Q 1.12

Write true or false for a given statement.

Liquids are heated by conduction and radiation.

  • True

  • False

Objective Questions | Q 1.13

Write true or false for a given statement.

Black surfaces are the poor absorbers of heat radiations.

  • True

  • False

Objective Questions | Q 2.01

Fill in the blank

Heat is a form of _______.

Objective Questions | Q 2.02

 Fill in the blank

_________ determines the degree of hotness or coldness of a body.

Objective Questions | Q 2.03

Fill in the blank

On heating a body, its temperature _______.

Objective Questions | Q 2.04

 Fill in the blank

 We use a ________ for measuring the temperature of a body.

Objective Questions | Q 2.05

 Fill in the blank

The S.I. unit of temperature is ________.

Objective Questions | Q 2.06

Fill in the blank

In a thermometer, the commonly used liquid is _______

Objective Questions | Q 2.07

Fill in the blank

The temperature of a normal human body is ________.

Objective Questions | Q 2.08

Fill in the blank

A person is said to have fever if his body temperature is more than _________

Objective Questions | Q 2.09

Fill in the blank

A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from _______ to _________

Objective Questions | Q 2.1

Fill in the blank

The temperature of boiling water is _______

Objective Questions | Q 2.11

Fill in the blank

Liquids expand _______ than the solids.

Objective Questions | Q 2.12

 Fill in the blank

 Gases expand _______ than the liquids.

Objective Questions | Q 2.13

Fill in the blank

Heat transfer in solids is by ______

Objective Questions | Q 2.14

Fill in the blank

Heat transfer in liquids and gases is by ________.

Objective Questions | Q 2.15

Fill in the blank

Metals are _______ of heat.

Objective Questions | Q 2.16

Fill in the blank

Still air is an __________ of heat.

Objective Questions | Q 2.17

Fill in the blank

Black and dull surfaces are ______ of heat.

Objective Questions | Q 3

Match the following

Column A Column B
1. mercury  1. insulator 
2. wood  2. water from 0°C to 4°C 
3. Aluminum 3.absorbs
4. contracts  4.conductor
5.black surface  5. Thermometer
Objective Questions | Q 4.1

Select the correct alternative

If we add a lump of ice to a tumbler containing water,

  • heat flows from water to ice

  • heat flows from ice to water

  • heat flows from water to ice if water is more

  • heat flows from ice to water if ice is more

Objective Questions | Q 4.2

Select the correct alternative

The temperature of pure melting ice is

  • 0°C

  • 100°C

  • 95°C

  • 98.6°F

Objective Questions | Q 4.3

Select the correct alternative

A thermometer uses

  • water

  • mercury

  • air

  • none of the above

Objective Questions | Q 4.4

Select the correct alternative

Which of the statement is correct

  • Iron rims are cooled before they are placed on cartwheels

  • A glass stopper gets tight on warming the neck of the bottle

  • Telephone wires sag in winter, but become tight in summer

  • A little space is left between two rails on a railway track

Objective Questions | Q 4.5

Select the correct alternative

Heat in a liquid is transferred by

  • conduction

  • convection

  • radiation

  • conduction and radiation

Objective Questions | Q 4.6

Select the correct alternative

In the process of convection, heat travel

  • sideways

  • downwards

  • upwards

  • in all directions

Objective Questions | Q 4.7

Select the correct alternative

The vacuum kept in between the walls of a thermos flask reduces the heat transfer by

  • conduction only

  • convection only

  • radiation only

  • conduction and convection

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Short/Long Answer Questions

Selina solutions for Concise Physics Class 7 ICSE Chapter 5 Heat Short/Long Answer Questions

Short/Long Answer Questions | Q 1

What is heat ? State its S.I. unit.

Short/Long Answer Questions | Q 2

What is meant by the term temperature.

Short/Long Answer Questions | Q 3

State the three units of temperature.

Short/Long Answer Questions | Q 4

Name the instrument used to measure the temperature of a body.

Short/Long Answer Questions | Q 5

Name two scales of temperature. How are they inter-related?

Short/Long Answer Questions | Q 6

How is the size of a degree defined on a Celsius scale ?

Short/Long Answer Questions | Q 7

How is the size of a degree defined on a Fahrenheit scale?

Short/Long Answer Questions | Q 8.1

State the temperature of  ice point on the Celsius scale.

Short/Long Answer Questions | Q 8.2

State the temperature of steam point on the Celsius scale.

Short/Long Answer Questions | Q 9.1

Write down the temperature of lower fixed point , on the Fahrenheit scale.

Short/Long Answer Questions | Q 9.2

Write down the temperature of upper fixed point,, on the Fahrenheit scale.

Short/Long Answer Questions | Q 10

What is the Celsius scale of temperature ?

Short/Long Answer Questions | Q 11

What is the Fahrenheit scale of temperature ?

Short/Long Answer Questions | Q 12

What is the Kelvin scale of temperature?

Short/Long Answer Questions | Q 13

The fig. shows a glass tumbler containing hot milk which is placed in a tub of cold water. State the direction in which heat will flow.

Short/Long Answer Questions | Q 14

Draw a neat labelled diagram of a laboratory thermometer.

Short/Long Answer Questions | Q 15

Write down the body temperature of a healthy person.

Short/Long Answer Questions | Q 16

What do you understand by thermal expansion of a substance ?

Short/Long Answer Questions | Q 17

Name two substances which expand on heating.

Short/Long Answer Questions | Q 18

Why do telephone wires sag in summer ?

Short/Long Answer Questions | Q 19

Iron rims are heated before they are fixed on the wooden wheels. Explain the reason.

Short/Long Answer Questions | Q 20

Why are gaps left between successive rails on a railway track ?

Short/Long Answer Questions | Q 21

A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why ?

Short/Long Answer Questions | Q 22

Why is a cement floor laid in small pieces with gaps in between?

Short/Long Answer Questions | Q 23

One end of a steel girder in a bridge is not fixed, but is kept on roliers. Give the reason.

Short/Long Answer Questions | Q 24

Describe one experiment to show that liquids expand on heating.

Short/Long Answer Questions | Q 25

State one application of thermal expansion of liquids.

Short/Long Answer Questions | Q 26

Describe an experiment to show that air expands on heating.

Short/Long Answer Questions | Q 27

An Empty Glass Bottle is Fitted with a Narrow Tube at Its Mouth When the Bottle is Heated, Bubbles of Air Are Seen Escaping into the Water. Explain the Reason.

Short/Long Answer Questions | Q 28

State which expands more, when heated to the same temperature : solid, liquid or gas ?

Short/Long Answer Questions | Q 29

Name the three modes of transfer of heat.

Short/Long Answer Questions | Q 30

Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum

Short/Long Answer Questions | Q 31

What are the good and bad conductors of heat ? Give two examples of each.

Short/Long Answer Questions | Q 32

Name a liquid which is a good conductor of heat.

Short/Long Answer Questions | Q 33

Name a solid which is a good conductor of heat.

Short/Long Answer Questions | Q 34

Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.

Short/Long Answer Questions | Q 35

Why is an oven made of double walls with the space in between filled with cork ?

Short/Long Answer Questions | Q 36

Why do we use cooking utensils made up of copper.

Short/Long Answer Questions | Q 37

Why is a tea kettle provided with an ebonite handle ?

Short/Long Answer Questions | Q 38

In summer, ice is kept wrapped in a gunny bag. Explain the reason.

Short/Long Answer Questions | Q 39.1

Explain why  we wear woolen clothes in winter.

Short/Long Answer Questions | Q 39.2

Explain why  the water pipes are covered with cotton during very cold weather.

Short/Long Answer Questions | Q 40

Why are quilts filled with fluffy cotton?

Short/Long Answer Questions | Q 41

State the direction of heat transfer by way of convection.

Short/Long Answer Questions | Q 42

Why is a ventilator provided in a room?

Short/Long Answer Questions | Q 43

Why are chimneys provided over furnace in factories?

Short/Long Answer Questions | Q 44

What are the land and sea breezes? Explain their formation.

Short/Long Answer Questions | Q 45

Why is the freezing chest in a refrigerator fitted near its top?

Short/Long Answer Questions | Q 46

Explain briefly the process of heat transfer by radiation.

Short/Long Answer Questions | Q 47

Give one example of heat transfer by radiation.

Short/Long Answer Questions | Q 48

Why do we prefer to wear white or light coloured clothes in summer and black or dark coloured clothes in winter ?

Short/Long Answer Questions | Q 49

The bottom of a cooking utensil is painted black. Give the reason.

Short/Long Answer Questions | Q 50

Draw a labelled diagram of a thermo flask. Explain how the transfer of heat by conduction, convection and radiation is reduced to a minimum in it.

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Numericals

Selina solutions for Concise Physics Class 7 ICSE Chapter 5 Heat Numericals

Numericals | Q 1

The temperature of a body rises by 1°C. What is the corresponding rise on the (a) Fahrenheit scale (b) Kelvin scale?

Numericals | Q 2

The temperature rises by 18°F. What is the rise on the Celsius scale?

Numericals | Q 3

Convert 5°F to the Celsius scale.

Numericals | Q 4

Convert 40°C to the (a) Fahrenheit scale (b) Kelvin Scale.

Numericals | Q 5

Convert – 40°F to the Celsius scale.

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Chapter 5: Heat

Objective QuestionsShort/Long Answer QuestionsNumericals
Concise Physics Class 7 ICSE - Shaalaa.com

Selina solutions for Concise Physics Class 7 ICSE chapter 5 - Heat

Selina solutions for Concise Physics Class 7 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 Concise Physics Class 7 ICSE solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Concise Physics Class 7 ICSE chapter 5 Heat are Heat as a Form of Energy and Its Units, Joule(J) and Calorie (Cal)., Different Units of Temperature (°C, °F, K)., Effects of Heat - Change in Temperature, Effects of Heat - Change in Size (Expansion and Contraction)., Effects of Heat - Change in State, Effects of Heat - Good Conductors and Bad Conductors of Heat and Their Examples, Effects of Heat - Choice of Conductors and Insulators in Day to Day Life (Pan Handles, Metal Cooking Utensils Etc.), Methods of Heat Transfer - Conduction, Methods of Heat Transfer - Convection, Methods of Heat Transfer - Radiation, Concept of Heat.

Using Selina Class 7 solutions Heat exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 7 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 5 Heat Class 7 extra questions for Concise Physics Class 7 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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