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Selina solutions for Class 8 Physics chapter 1 - Matter

Selina Concise Physics - Middle School for Class 8 (2018-19 Session)

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Selina Selina Concise Physics - Middle School Class 8 (2018-19 Session)

Selina Concise Physics - Middle School for Class 8 (2018-19 Session) - Shaalaa.com

Chapter 1: Matter

Chapter 1: Matter solutions [Page 0]

 

Write true or false 

The temperature of a substance remains unaffected during its change of state.

 Write true or false 

 Ice melts at 100°C.

Write true or false 

Water at 100°C has more heat than the steam at 100°C.

 Write true or false

Evaporation of a liquid causes cooling.

 Write true or false

 Water evaporates only at 100°C.

 Write true or false

 Boiling takes place at all temperatures.

Write true or false .

Evaporation takes place over the entire mass of the liquid.

Write true or false 

 The process of a gas converting directly into solid is called vaporization.

 Write true or false

At high altitudes water boils above 100° C.

Write true or false 

The melting point of ice is 0°C.

 Fill in the blank

 Evaporation takes place at ...............temperature.

 Fill in the blank

.............. process is just reverse of melting.

 Fill in the blank

.............. is a process that involves direct conversion of a solid into its vapour on heating.

 Fill in the blank

The temperature at which a solid converts into a liquid is called its .........

Fill in the blank

The smallest unit of matter that exists freely in nature is called ...........

 Fill in the blank

 Molecules of a substance are always in a state of............ and so they possess .............

Fill in the blank

Intermolecular space is maximum in ........ less in .......... and the least in ....

 Fill in the blank

Intermolecular force of attraction is maxiumum in ..........less in .......and the least in ..........

 Match the following

Column A Column B
(a) Molecules (i) Water boils
(b) 100° C (ii) Evaporation
(c) 0° C (iii) Changes from solid to gas
(d) At all temperatures (iv) Matter
(e) Camphor (v) Water freezes

Select the correct alternative

The inter-molecular force is maximum in

  1. solids
  2. gases
  3. liquids
  4. none of the above

Select the correct alternative

The inter-molecular space is maximum in

  1. liquids
  2. solids
  3. gases
  4. none of the above

 Select the correct alternative

The molecules can move freely anywhere in

  1. gases
  2. liquids
  3. solids
  4. none of the above

 Select the correct alternative

The molecules can move freely anywhere in

  1. gases
  2. liquids
  3. solids
  4. none of the above

Select the correct alternative

The temperature at which a liquid gets converted into its vapour state is called its

  1. melting point
  2. boiling point
  3. dewpoint
  4. freezing point.

Select the correct alternative

Rapid conversion of water into steam is an example of

  1. evaporation
  2. freezing
  3. melting
  4. vapourization.

 Select the correct alternative

 Evaporation takes place from the

  1. surface of liquid
  2. throughout the liquid
  3. mid-portion of the liquid
  4. bottom of liquid.

 Select the correct alternative

Boiling takes place from the

  1. the surface of the liquid
  2. throughout the liquid
  3. mid-portion of liquid
  4. none of the above.

Chapter 1: Matter solutions [Page 0]

Define the term matter. What is it composed of ?

State three properties of molecules of a matter.

What do you mean by the inter-molecular spaces ? How do they vary in different states of matter ?

What is meant by the inter-molecular forces of attraction ?

Which of the following are correct ?

Solids have definite shape and definite volume.

Which of the following are correct ?

 Liquids have definite volume but do not have definite shape.

Which of the following are correct ?

 Gases have definite volume but no definite shape.

Which of the following are correct ?

Liquids have definite shape and definite volume.

Discuss the three states of matter solid, liquids and gas on the basis of molecular model.

What do you mean by the change of state ? Write the flow chart showing the complete cycle of change of state.

Differentiate between boiling point, giving atleast one example of each.

Differentiate between melting point ,giving atleast one example of each.

Describe the process of condensation  with examples.

Describe the process of  sublimation with examples.

Explain the term melting .

Explain the term melting point.

Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.

Explain the terms vaporization.

Explain the terms boiling point.

A liquid can change into vapour state at a fixed temperature.

A liquid can change into vapour state at all temperatures.

Name the processes involved in two cases.

Some ice is taken in a beaker and its temperature is recorded after each one minute. The observations are listed below

From the above observations what conclusion do you draw about the melting point of ice ?

Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature.

State  the melting point of ice.

State the boiling point of water.

What is evaporation ?

State three factors which affect the rate of evaporation of a liquid.

Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.

Water in a dish evaporates fasterjhan in a bottle. Give reason.

Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles ?

A certain quantity of water is heated from 20°C to 100°C. Its temperature is recorded after each 1 minute. The observations are:

What conclusion do you draw from the above table about the boiling point of water ? Explain.

Why is cooling produced on evaporation of a liquid ?

Explain with an example to demonstrates that when a liquid
evaporates, it takes heat from its surroundings.

Give two applications of evaporation.

Explain why in hot summer days water remains cool in earthen pots.

A patient suffering from high fever is advised to put wet clot strips on his forehead. Why ?

What do you mean by sublimation ? Explain with an example.

Why does the size of naphthalene balls decrease when left open ?

Describe an experiment to demonstrate the process of sublimation.

Chapter 1: Matter

Selina Selina Concise Physics - Middle School Class 8 (2018-19 Session)

Selina Concise Physics - Middle School for Class 8 (2018-19 Session) - Shaalaa.com

Selina solutions for Class 8 Physics chapter 1 - Matter

Selina solutions for Class 8 Physics chapter 1 (Matter) 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 Selina Concise Physics - Middle School for Class 8 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing 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 Class 8 Physics chapter 1 Matter are Kinetic Theory of Matter, Three States of Matter in Terms of Movement of Particles, Energy Content in the Three States of Matter, Change of State in Matter Using the Kinetic Theory: - Boiling, Change of State in Matter Using the Kinetic Theory: - Vaporization, Change of State in Matter Using the Kinetic Theory: - Melting, Change of State in Matter Using the Kinetic Theory: - Fusion, Change of State in Matter Using the Kinetic Theory: Evaporation, Change of State in Matter Using the Kinetic Theory: - Condensation, Change of State in Matter Using the Kinetic Theory: Sublimation, Change of State in Matter Using the Kinetic Theory: - Deposition, Change of State in Matter Using the Kinetic Theory: - Freezing, Change of State Diagrams.

Using Selina Class 8 solutions Matter 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 8 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 1 Matter Class 8 extra questions for Physics and can use Shaalaa.com to keep it handy for your exam preparation

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