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Lakhmir Singh Solutions

Lakhmir Singh, Manjit Kaur Solutions are the most sought-after books in the CBSE curriculum by students and teachers. They are highly prized and acclaimed books in the schools following the CBSE curriculum. Lakhmir Singh Science Books are important because of the methodical descriptions and theories, which help students learn each topic faster.

Lakhmir Singh and his wife, Manjit Kaur, are eminent professors in their respective Science streams. The couple has co-authored numerous books on Science after deciding to leave their jobs. Lakhmir Singh was a former professor of Chemistry at Delhi University when he gathered that NCERT needed a simplified version of their existing Science textbooks. His primary motive to write the book was for students who couldn't afford private tuition but needed a better understanding of the subject. Gaining success from his first book (which was on Chemistry), he and his wife started to include Physics and Biology in their list. Since then, they have come out with books for classes 8, 9 and 10. Their presentation of the topics, along with vivid photographic images, are also much appreciated.

We cannot imagine our lives without Science. Communication, medicine, transportation, and almost everything we see around are mainly present because individuals have applied their science knowledge to create or, more specifically, invent them. Undoubtedly, these inventions have made our lives easier. Learning the basics of some devices can help people develop their ideas as well. Studying Science can also make us understand nature better, make us aware of how nature operates, and find alternatives to conserve our natural resources. Ergo, it is necessary to include Science as a school subject. Science education is relevant to develop a student's critical thinking ability and problem-solving skills. They are also able to grasp the fundamental concepts, principles and facts of Science. And Lakhmir Singh Solutions can help them achieve that

Lakhmir Singh Solutions have described all the topics of Science very efficiently. It is considered the best study material available in the market. Students from various schools in CBSE boards follow the Lakhmir Singh & Manjit Kaur Solutions because of its cohesive content and practical examples for every chapter. Each chapter has exercise-based questions of various kinds, including short questions, broad questions, questions that require high order thinking and even MCQs, which can test the students' knowledge. The easy language in the book helps students grapple with several concepts in an orderly fashion. The exercise questions of Lakhmir Singh and Manjit Kaur have been explained comprehensively to help students solve exam-related questions. The solutions are created in an explanatory method by subject experts to guide students in preparation for their board exams.

Lakhmir Singh Solutions Class 8 Science

Lakhmir Singh Solutions is one of the most viable options for the class 8 students to guide them through the curriculum. It conforms to the NCERT syllabus. Moreover, the concepts are simplified in addition to their detailed manner. There are 18 chapters in the Lakhmir Singh Solutions Class 8 Science, which forms the basis of Class 9. These range from crop production, their management, materials including metals and non-metals, conserving plants and endangered animals, the cell structure of the living organisms, their reproduction, reaching the tender age of puberty (when the body undergoes various changes), force and friction, Sound, Light, the solar system and the biggest concern of the environment – pollution.

The opening chapter is about Crop Production and Management. Agriculture is undeniably the largest source of income, especially in rural areas. It is the Science and practice of cultivating plants and livestock. Crops are plants that are grown extensively for personal use and at times for profit. This lesson teaches about the variety of crops grown in our country and the factors in play regarding their growth and harvest. Irrigation by sprinkler and drip system is also explained. It helps us better know the occupation of the farmers and how they stand as the country's backbone.

Chapter 2 deals with Microorganisms and how and why they can be our friend and foe simultaneously. The chapter classifies the major groups of microorganisms like bacteria, viruses, protozoa etc. Since they reside both within and outside, it is important to know which are harmful (that causes diseases) and which are not. We further learn the different cycles like the nitrogen, oxygen, and carbon cycles, where these microorganisms have a vital role.

Chapter 3 Synthetic Fibres and Plastics tells us about the different kinds of synthetic and natural fibres and their characteristics, biodegradable and non-biodegradable materials and how plastics affect the environment and minimize the excess plastic waste.

Chapter 4 Materials: Metals and Non-metals focuses on elements that are divided into metals (iron, copper etc.) and non-metals (carbon, sulphur, oxygen etc.), their respective physical and chemical properties and their uses.

Chapter 5 Coal and Petroleum refers to the various natural resources, fossil fuels, renewable and non-renewable resources. It also discusses coal, petroleum, diesel and natural gas. The conservation and judicious utilization of all these resources is explained concisely. This chapter highlights the key points of the preservation and conservation of energy for the future.

In Chapter 6 we delve into Combustion and Flame. The chapter helps us understand the difference between these two. Combustible and non-combustible substances, types of combustion, and the conditions necessary for it are also mentioned here.

Can we imagine our life on earth without plants and animals?

Chapter 7 Conservation of Plants and Animals answers just that. It tells us their importance and how humankind is continuing to exploit them. The chapter teaches us about deforestation and its consequences, the role of biosphere reserves and the need for reforestation.

As we have learnt in previous classes, cells are the fundamental unit of life.

Chapter 8 Cell Structure and its Functions teach us about the structure, size, shape and organelles present in an organism.

Chapter 9, Reproduction in Animals, gives us the description of the biological process of Reproduction. The types of Reproduction, sexual and asexual and the different structures of male and female reproductive systems are explained brilliantly.
Moving further, Chapter 10 deals with Reaching the Age of Adolescence. The body undergoes changes leading to reproductive maturity during a phase called adolescence. This lesson deals with the hormones secreted by various glands present in the body and the reproductive phases. The physical, emotional and behavioural changes of a person during this period are explained briefly.

The following chapters mark the entry of the physical phenomena around us.

Chapter 11 explores Force and Pressure. Force is defined as the push or pulls experienced by the object to change its size, shape, or state of rest or motion. There are different kinds of forces too. The pressure is defined as the force acting per unit area of a surface. The chapter also tells us about the everyday applications of force and pressure.

Chapter 12 Friction gives us insight into what friction is, the factors affecting it and its causes, and their advantages and disadvantages. Friction is defined as the force that opposes an object's motion on the surface it is in contact with.

A sound is a form of energy that makes us hear by our ears. A vibrating body produces it.

In Chapter 13, Sound, we see sounds produced by different objects, how they are produced, their units, speed of Sound, and damages caused by the high volume of sounds and how noise pollution is created.

Chapter 14 Chemical Effects of Electric Current defines the phenomena of electrolysis in this chapter. The chemical changes in conducting liquid on passing an electric current through them are generally termed electrochemistry. It talks about good conductors and poor conductors, electrolytes and non-electrolytes, electrolysis of water and electroplating.

In Chapter 15, we stumble to find Some Natural Phenomena, which include lightning and earthquake. Lightning is an electric spark on a huge scale caused by the accumulation of electric charge in the cloud. So the electrical phenomena happen because of the charged nature of the clouds. Later on, we see how to measure the severity of earthquakes and protect ourselves if it happens.

Light is a form of energy that makes things visible. In Chapter 16, Light, we study the reflection of light and its laws, the formation of an image on a plane mirror, and the human eye's anatomy. Stars are celestial objects that are extremely hot and have light of their own. The objects in the sky are called celestial objects, namely planets, stars, asteroids, comets and meteoroids.

Chapter 17 Stars and the Solar System consists of the moon and its phases, light year, the multiple constellations we find in the sky, the solar system consisting of the 8 planets and artificial satellites. Lastly, Chapter 18 ends with Pollution of Air and Water. The presence of a high concentration of a harmful or poisonous substance in the environment is called pollution. It contaminates both the air and water with toxic substances. This chapter describes air pollution and water pollution, its causes, chlorofluorocarbons, the depletion of the ozone layer, the greenhouse effect, global warming and the various steps to reduce pollution.

Lakhmir Singh Solutions For Class 9


Lakhmir Singh Solutions For Class 9 Physics

Physics is a must for understanding the complexities of technology and essential for the advancement of a nation. Despite its importance, physics is sometimes not a favourite subject among students. But physics can be a pretty scoring subject, too, once the concepts are cleared. The comprehensive Lakhmir Singh Physics Class 9 Solutions help in building a solid foundation in physics concepts. The topics are covered chapter wise with all steps properly explained with illustrations and diagrams. Physics is a core mathematical subject, and those who are good at mathematics find physics interesting as well. The concepts are explained with the help of examples and problems give students a chance to practice and apply the formulas.

Chapter 1 is about Motion. The change in location of a body with respect to its surroundings is called motion. It also covers distance travelled, displacement, speed, velocity, acceleration and the laws of motion. There are three laws of motion, and these laws are explained with the help of diagrams and graphs. The derivations of these laws are explained in the chapter.

Chapter 2 Force and Laws of Motion explains the laws of motion. A push or pull on a body is called force. Force can move a stationary body or stop a moving body. It can also change the speed of a moving body and change the shape and size of a body. Thus, force is responsible for the change in velocity, direction, and shape of the body. Momentum, conservation of momentum, and Newton's laws of motion are the other concepts that are explained here.

Every object in this universe attracts every other object. This is called gravitation.

Chapter 3 Gravitation talks about gravitational force, Kepler's laws of motion, buoyancy, Archimedes' Principle and density. The numerical problems at the end of the chapter give a better understanding of the concept.

Chapter 4 is Work and Energy. Work is done when a force produces motion in its direction. And to do this, energy is required, which can be positive energy, negative energy or just zero energy. The unit of energy is Joule. The chapter also discusses kinetic energy, potential energy, chemical energy, heat energy, light energy, sound energy, electrical energy, chemical energy, energy transformation and conservation. A sound is a form of energy that is produced by the vibrations of objects.

Chapter 5 Sound reveals more about Sound, how Sound travels in waves, longitudinal and transverse waves, their graphical representation, its characteristics – wavelength, amplitude, time-period, frequency and wavelength of a wave, the reflection of Sound, and laws applications. It also educates about echo and reverberations, sonar and characteristics of the human ear.

Students can find MCQs, various types of questions at the end of each chapter, and the Lakhmir Singh Solutions for Class 9th Physics answers all these questions for the student.

Lakhmir Singh Solutions for Class 9 Chemistry

Chemistry is a vital subject to understand what is happening around us. Chemistry is at times referred to as the "central science". The concepts learnt here help connect the physical sciences, including mathematics and physics, with applied sciences, including biomedical, meteorology and engineering. Lakhmir Singh Solutions for Class 9 Chemistry simplifies the subject, develops our understanding, and helps in writing answers. The textbook is one of the most detailed books in the market and is a perfect read for those who want to excel in exams.

Chapter 1 Matter in our Surroundings defines matter as being made up of particles. This gives knowledge of the definition of matter and the classification of matter as solid, liquid and gas and its characteristics like shape, volume and density. Characteristics of particles of matter, diffusion in gases, liquids and solids are also shown. The unit of temperature K (Kelvin) also elaborated. It also explains the changes of states - melting, freezing, latent heat (fusion and evaporation), sublimation, the effect of change of pressure, evaporation, and condensation. It also touches lightly upon the Bose-Einstein Condensate (BEC).

Chapter 2 Is matter around us Pure allows us to explore elements, compounds and mixtures. The types of elements (metals, non-metals, and metalloids), their properties and differentiation of compounds and mixtures are also explained. The solution, properties of a solution, colloids and their properties, solubility, the effect of temperature and pressure on solubility, saturated and unsaturated solutions, separation of the mixture of two or more liquids, separation by fractional distillation and separation funnel are all covered in this chapter.

Chapter 3 Atoms and Molecules is regarding atoms and molecules. As we know, all matter is made of particles. The chapter starts with the law of combinations which explains three main laws and the experiments performed to verify the laws. Dalton's atomic theory of matter is very well explained. The drawbacks of Dalton's theory are also pointed out. Atoms, the atomic mass of an element, molecules, molecular mass and its calculation, the significance of the formula of a substance, the chemical formula of molecular and ionic compounds, gram atomic mass and gram molecular mass and mole concept are discussed extensively in this chapter. Numerous problems are also given at the end of each topic.

In Chapter 4, Structure of an Atom, we learn about the concept of the structure of an atom. Atoms are made up of three subatomic particles: electrons, protons and neutrons. The atoms of different elements differ in the number of electrons, protons and neutrons. The discoveries and properties of electrons, protons and neutrons are demonstrated in this chapter. We get to see Thomson's Structure of the atom, Rutherford's structure of the atom (its drawbacks too), Bohr's model and the stability of the atom, atomic number and mass of an element, the inertness of noble gases, valency of elements: electrovalency and covalency, isotopes and isobars. The chapter ends with problems related to isotopes and isobars.

Lakhmir Singh Solutions for Class 9 Biology

Biology plays an important role in understanding complex forms of life involving humans, animals, and plants. Studying biology is the foundation of all characteristics of life on earth. In addition, biology has shaped modern medicine. It is a large area of study that houses other branches of Science within it. Lakhmir Singh Solutions for Class 9 Biology is one of the best guides for the biology of class 9 CBSE. This covers the latest CBSE Syllabus based on the NCERT guidelines and can be handy for any other boards, too, as it encompasses a strong foundation in all major topics in the biology syllabus. This book has multiple choice questions, short answers, short answer type questions, long answer type questions, and diagrams-based questions.

Chapter 1 Improvement in Food Resources tells about the variety of food resources in the world. It talks about the variety of crops we grow the entire year. We learn about sustainable agriculture and organic farming, improving yields, the difference between manure and fertilizers, irrigation (its advantages), rainwater harvesting, watershed management, cropping patterns, protection of crops against diseases etc. The chapter also covers animal husbandry, poultry farming, aquaculture and apiculture.

Chapter 2 is The Fundamental Unit of Life. The cell is the structural and functional unit of living organisms. All living organisms in this universe are made up of cells. They either exist as a single cell or as a combination of multiple cells. They are called unicellular organisms and multicellular organisms, respectively. This chapter teaches us about the structure of a cell, cell wall, plasma membrane, cytoplasm, and differences between plant cells and animal cells. The chapter also contains a variety of questions.

Chapter 3 Tissues is the next step in the study as tissue is a collection of certain types of cells. The chapter deals with the types of tissue present in plants and animals and the functions they perform. Tissue can be defined as a group of cells with similar shape and function. The chapter gives us knowledge about how tissues build up a muscle.

Chapter 4 Diversity in Living Organisms highlights the biodiversity of plants and animals. It teaches us about the basis of classification of the animal kingdom, the hierarchy and the categories of groups, and the detailed classification of the plant kingdom. The organisms are classified based on their evolution, geographical conditions and also on their nature. The nomenclature of these species, plants and animals are also taught here.

Chapter 5 Why do we Fall Ill lets us know the reasons why humans fall ill. We learn about health and its failure, diseases, sources, causes and types, symptoms, and treatment. This chapter also includes the various steps on dealing with diseases and the precautionary measures to avoid the spreading of diseases.

Chapter 6 Natural Resources gives us a brief idea about the natural resources found in nature. The chapter also briefs on the hazards the environment faces- different kinds of pollution, global warming, deforestation, and ozone layer depletion. It also gives us an idea about the conservation and management of these natural resources.

Lakhmir Singh Solutions For Class 10


Lakhmir Singh Solutions for Class 10 Physics

Lakhmir Singh Manjit Kaur Solutions for Class 10 Physics is one of the best reference textbooks for CBSE class 10. Every concept explained in this book comes with supporting examples and problems that allow students to understand the application of formulas and equations. This textbook also comprises concept explanations, practice questions, and solved examples. In addition, the numerical problems are explained step by step to make sure that students understand them thoroughly. There are a total of six chapters in this book.

Electricity is something we can't live without nowadays. Therefore, it has become an essential part of our lives.

Chapter 1 Electricity shows the importance of electricity, types of electric charges, conductors and insulators, electric current, the direction of electric current, circuit diagrams, the relationship between current and potential difference, Ohm's law, resistance, voltage and the applications of heating effect of electric current.

Chapter 2 Magnetic Effect of Electric Current explains how electric current can produce the magnetic field. An electric current produces a magnetic effect. This happens when an electric current passes through a wire, and that current-carrying wire behaves like a magnet. It creates a magnetic field around the wire as well. This chapter explores magnetic field and magnetic field lines, properties of magnetic field lines, the magnetic field of the earth, the right-hand rule, electromagnetic induction, electromagnetism and the hazards and precautions of using electricity.

Chapter 3 Sources of Energy talks about the different kinds of energy we use in our everyday lives. A source of energy provides an adequate amount of energy in a convenient form over a long period. There are two types of energy sources- renewable (which can be renewed) and non-renewable (which cannot be renewed). The chapter also gives information about fossil fuels, how they were formed, and the sun is the ultimate source of fossil fuels. It also suggests using other kinds of energy like hydroelectric energy, solar energy, biomass energy, tidal energy, nuclear energy to prevent pollution and exhaustion of resources.

Next, we move on to Chapter 4 with Reflection of Light. We have studied light in previous classes, but we read about light in a more detailed manner. It tells us what light is and how reflection takes place. Light is also a form of energy. Reflection of Light from the plane and curved surfaces, laws of reflection, convex mirror, concave mirror, images formed using these mirrors are covered here.

Chapter 5 Refraction of Light states the laws of refraction and why the speed of Light causes refraction. Sign convention of lenses, their formula and numericals related to it are given in the chapter.

Finally, Chapter 6, The Human Eye and the Colourful World, demonstrate the human eye and its workings. The functions of the iris, pupil, retina and optic nerve are also described. The defects of vision and their correction by using lenses are shown here. The chapter also gives an idea about the refraction of light through a glass prism, the concept of a rainbow, the atmospheric refraction, the scattering of light and the experiments related to it.

Lakhmir Singh Solutions for Class 10 Chemistry

Lakhmir Singh Solutions for Class 10 Chemistry is an important book for good knowledge and understanding of the subject and its concepts. It helps students understand easily and effectively. The most important feature is that many solved and unsolved questions are included to assess the students' learning abilities. The main aim of this is to make Chemistry more attractive, interesting and understandable to the students.

Chapter 1 Chemical Reactions and Equations deals with reactions, the formation of new substances and a way to represent them. It discusses the fine points of chemical reactions, chemical equations, balanced and unbalanced chemical equations, types of chemical reactions and some important examples.

Chapter 2 Acids, Bases and Salts introduces the three very common chemical compounds types -acids, bases and salts. The chapter is all about their properties. The concept of indicators and pH scales are also discussed. The preparation of compounds like sodium hydroxide, washing and baking soda, gypsum is also shown.

Chapter 3 Metals and Non-Metals picks up from where it left in class 9 and explains it broadly. First, the chapter demarcates all the known elements classified into metals, metalloids and non-metals. It then explains the physical and chemical properties of metals and non-metals and explains the reactivity series's basis. Next, the chapter gives a reason for the formation of covalent and ionic bonds. Finally, this chapter elaborates on the refining and corrosion of metals, including the causes and prevention of rusting of iron.

Chapter 4 Carbon and its Compounds discusses more carbon and its allied compounds. We know carbon is a non-metal element. The first topic shows the bonding nature of carbon and the reason behind the long chains of carbon. Next, the homologous series is discussed. The chapter also shows the structure of diamond and graphite.
The nomenclature of different carbon-containing functional groups attached to it like alcohol (-OH), aldehydes (-CHO), ketones (-CO-), alkanes (CnH2n+2), alkenes (CnH2n) and alkynes (CnH2n-2), halogens (X), etc., are also covered in this chapter. It also addresses organic compounds (their properties and effects) and the manufacture of soap and detergents.

In Chapter 5, Periodic Classification of Elements, we learn how different elements are classified and on what basis. For the first time, the students get to know about the modern periodic table. Noble gases also appear in this chapter as a separate group of elements. The chapter shares the atomic number of elements, the modern periodic table and its explanation based on the electronic configuration of elements, characteristics of the periods and groups of the periodic table, valency and the advantages of the modern periodic table.

At the end of the book, we find MCQs, NCERT questions. The answers provided by the Aakash Lakhmir Singh Solutions for Class 10th Chemistry for exercises are supposed to enrich the students' knowledge.

Lakhmir Singh Solution For Class 10 Biology

The Lakhmir Singh and Manjit Kaur Textbook for Class 10 Biology presents a detailed picture of every chapter. This book gives a vast range of motion, concepts and examples. The solutions provided in this book are unique, and the answers are explained in an uncomplicated way. The answers given in this book were elucidating and explained diagrammatically wherever necessary. The book consists of hundreds of questions in each chapter and covers the entire topics to be studied.

The opening Chapter 1 is about Life Processes. The basic metabolic functions performed by living beings to function properly and sustain their life on earth are called life processes. The basic life processes common to all living beings commonly include Nutrition, Transport, Respiration, Control and Coordination and Excretion. It shows the different types of nutrition and also the life processes of unicellular and multicellular organisms. In addition, it explains the functions of the human digestive system and the human circulatory system. This chapter also includes the metabolism of plants' life cycle and structure.

Chapter 2 Control and Coordination clarifies that there are certain changes in the environment to which the organisms respond. These changes are called stimuli. And the response to this stimulus is usually in the form of some movement of their body part. The synchronized working of various organs of the body of an organism in a controlled manner to produce the appropriate reaction to single or multiple stimuli is called coordination. This chapter talks about the control and coordination of both plants and animals. It describes the workings of the human nervous system, the reflex actions, hormones, structure of a neuron and the human brain. These are well explained with the help of diagrams.

Chapter 3 How Do Organisms Reproduce explains the process of Reproduction efficiently. It details the types of Reproduction (sexual and asexual). Reproduction in plants by both natural and artificial methods is discussed. Reproduction in animals, puberty, human reproductive system, fertilization of embryos, embryo development, menstrual cycle in females, and the different methods to control population manifests in the chapter.

Chapter 4 Heredity and Evolution says that the process by which the transmission of characters/traits of an organism is transferred from parents to their offspring is called heredity. It sets forth the law of genetics, chromosomes, genes, genotype and phenotype, different blood groups, how blood groups are inherited, and the sex determination of a child. The second part of the chapter-Evolution is the sequence of gradual changes in primitive organisms over a million years in which new species are produced. Finally, the aspects of human evolution are included with the discussion of theories of evolution.

Chapter 5 Our Environment gives us detailed descriptions of the ecosystem, food chain, food web and energy transformation from one organism to another. We learn about the environmental hazards like pollution, global warming, extinction of species and the steps we can adopt to prevent these.

Chapter 6, Management of Natural Resources, focuses on sustainable development. It teaches us to manage our natural resources, wildlife conservation, rainwater harvesting and the three steps to save the environment- reduce, reuse and recycle.

FAQs in Lakhmir Singh Solutions by the Aakash Institute

Ques 1. Why should I read Lakhmir Singh Solutions prepared by the Aakash institute?
Aakash Institute offers the best answers to the questions in the book. Experts extensively prepare and revise these answers, and the study materials offered help students score satisfactory marks in their respective board exams.

Ques 2. What are the benefits of the Lakhmir Singh solutions provided by the Aakash institute?
Instant access to multiple resources can help strengthen the core concepts of weak students. In addition, the language used is kept simple and easy to make the students understand the theories.

Ques 3. What is different about Lakhmir Singh Solutions by the Aakash institute?
The answers to the questions in Lakhmir Singh Solutions for all classes are covered and written in a simple and precise manner. Aakash institute also builds the basis of important topics that students face in higher classes. It also prepares students for competitive exams like National Olympiads etc.

Ques 4. Can the answers be easily accessed in Lakhmir Singh Solutions by students at Aakash institute?
Yes, the answers prepared by the subject matter experts are easily accessible to students, and they have been kept very precise and to the point. Moreover, they have been demarcated in a class-wise and a chapter-wise fashion for accessibility. And all the answers have been solved in a step by step manner.

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