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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
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Chapter 5: Heat

Objective QuestionsShort/Long Answer QuestionsNumericals
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Objective Questions

Selina solutions for Concise Physics Class 7 ICSE Chapter 5 HeatObjective 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 _______.

  • electrical energy

  • gravitational energy

  • thermal energy

  • None of these

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

Short/Long Answer Questions

Selina solutions for Concise Physics Class 7 ICSE Chapter 5 HeatShort/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.

Numericals

Selina solutions for Concise Physics Class 7 ICSE Chapter 5 HeatNumericals

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.

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 Effects of Heat, Transfer of Heat, Temperature, Expansion of Substances (Thermal Expansion), Heat and Its Unit, Expansion of Liquids, Expansion of Solids, Expansion of Gases, Conduction, Convection, Radiation, Conductors and Insulators, Thermos Flask (Dewar Flask), Hot and Cold Objects, Scales of Thermometers, Measuring Temperature.

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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