NCERT Solutions for Class 10 Science all chapters in PDF for CBSE board, MP, Bihar board, UP Board, Gujrat Board, Uttarakhand Board, MP Board (Madhya Pradesh Board 2019 – 20 (High School) in Hindi Medium and English medium (& NCERT Solutions of Maths and Social Science ) to download is available on this web page. Download Offline Apps also.
NCERT Solutions for Class 10 Science
Chapter 1: Class 10 Chemistry
Chemical Reactions and Equations
रासायनिक अभिक्रियाएं एवं समीकरण
Chapter 2: Class 10 Chemistry
Acids, Bases and Salts
अम्ल, क्षारक एवं लवण
Chapter 3: Class 10 Chemistry
Metals and Non – Metals
धातु एवं अधातु
Chapter 4: Class 10 Chemistry
Carbon and its Compounds
कार्बन एवं उसके यौगिक
Chapter 5: Class 10 Chemistry
Periodic Classification of Elements
तत्वों का आवर्त वर्गीकरण
Chapter 6: Class 10 Biology
Chapter 7: Class 10 Biology
Control and Coordination
नियंत्रण एवं समन्वय
Chapter 8: Class 10 Biology
How do Organisms Reproduce?
जीव जनन कैसे करते हैं?
Chapter 9: Class 10 Biology
Heredity and Evolution
आनुवंशिकता एवं जैव विकास
Chapter 10: Class 10 Physics
Light – Reflection and Refraction
प्रकाश – परावर्तन तथा अपवर्तन
Chapter 11: Class 10 Physics
Human Eye and Colourful World
मानव नेत्र तथा रंगबिरंगा संसार
Chapter 12: Class 10 Physics
Chapter 13: Class 10 Physics
Magnetic Effect of Electric Current
विधुत धारा के चुंबकीय प्रभाव
Chapter 14: Class 10 Physics
Sources of Energy
ऊर्जा के स्रोत
Chapter 15: Class 10 Biology
Chapter 16: Class 10 Biology
Management of Natural Resources
प्राकृतिक संसाधनों का प्रबंधन
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Why is respiration considered an exothermic reaction? Explain.
Energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down into simpler substances such as glucose. Glucose combines with oxygen in the cells and provides energy. The special name of this combustion reaction is respiration. Since energy is released in the whole process, it is an exothermic process.
What are olfactory indicators? Give an example.
Olfactory indicators are substances which have different odour in acid and base solutions. For example, vanilla essence has characteristics pleasant smell in acid solution and no smell in alkali solution.
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Metals that are more reactive than hydrogen displace it from dilute acids.
For example: sodium and potassium.
Metals that are less reactive than hydrogen do not displace it.
For example: copper and silver.
Carbonate and Sulphide ores are usually converted into oxides during the process of extraction. Why?
Carbonate and sulphide ores are usually converted into oxides during the process of extraction because metals can be easily extracted from their oxides rather than from their carbonates and sulphides.
What change will you observe if you test soap with litmus paper (red and blue)?
Since soap is basic in nature, it will turn red litmus blue. However, the colour of blue litmus will remain blue.
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
The element with atomic number 12 has same chemical properties as that of calcium.
This is because both of them have same number of valence electrons (2).
Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
In multi-cellular organisms, all the cells may not be in direct contact with the surrounding environment. Thus, simple diffusion will not meet the requirements of all the cells.
What is the difference between a reflex action and walking?
A reflex action is a rapid, automatic response to a stimulus. It does not involve any thinking. For example, we close our eyes immediately when the bright light is focused.
Walking, on the other hand, is a voluntary action. It is under our conscious control.
What are the advantages of sexual reproduction over asexual reproduction?
Advantages of sexual reproduction:
In sexual reproduction, more variations are produced. Thus, it ensures survival of species in a population.
The new formed individual has characteristics of both the parents.
Variations are more viable in sexual mode than in asexual one. This is because in asexual reproduction, DNA has to function inside the inherited cellular apparatus.
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
Small numbers of tigers means that fewer variations in terms of genes are available. This means that when these tigers reproduce, there are less chances of producing progeny with some useful variations. Hence, it is a cause of worry from the point of view of genetics.
The refractive index of diamond is 2.42. What is the meaning of this statement?
Refractive index of a medium nm is related to the speed of light in that medium v by the relation:
n = c/v
Where, c is the speed of light in vacuum/air
The refractive index of diamond is 2.42. This suggests that the speed of light in diamond will reduce by a factor 2.42 compared to its speed in air.
What is the far point and near point of the human eye with normal vision?
The near point of the eye is the minimum distance of the object from the eye, which can be seen distinctly without strain. For a normal human eye, this distance is 25 cm. The far point of the eye is the maximum distance to which the eye can see the objects clearly. The far point of the normal human eye is infinity.
Why is the series arrangement not used for domestic circuits?
There is voltage division in series circuits. Each component of a series circuit receives a small voltage for a large supply voltage. As a result, the amount of current decreases and the device becomes hot. Hence, series arrangement is not used in domestic circuits.
Why does a compass needle get deflected when brought near a bar magnet?
Magnetic compass needle and bar magnet both have magnetic field. When they brought near to each other, these magnetic fields interact each other giving deflection in needle.
How has the traditional use of wind and water energy been modified for our convenience?
To use energy of flowing water large dams are built in hilly regions to store huge amount of water at a height. The stored water from high level in dam is carried through pipes to the turbine at the bottom of the dam and runs hydropower plant.
Similarly, the wind energy is used to generate electricity. For the same purpose, the rotatory motion of windmill is used to tum the turbine of the electric generator.
Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
Ozone layer is a protective shield around the earth. It prevents harmful ultraviolet radiation of the sun from reaching the earth. Air pollutants, like chlorofluorocarbons (CFCs), are causing depletion of ozone layer. This is allowing greater amount of UV radiation to reach the earth. UV radiation can upset the ecosystem by affecting photosynthesis in plants, destroying planktons and decomposers. In human beings, UV radiation may cause skin cancer, cataract of eyes and damage to immune system. Several developed as well as developing nations of the world have agreed to sign and obey the directions of TINEP (United Nations Environment Programme) to freeze the production of CFCs or to 1imit their production to some extent.
Why do you think there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?
Equitable distribution of resources will ensure benefits to all the sections of the society rich as well as poor. This is necessary for the growth and development of a country. Money force is the main factor which is working against an equitable distribution of resources as rich people and rich nations try to encroach upon the share of the poor people or poor nations.