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Sometimes, it can be a thing of nightmares, quite literally when you need to stay up all night trying to understand some or another concept for a maths exam the next day. These NCERT solutions for class 9 maths chapter 1 especially are magical for students who dislike or are weak in maths.
They provide all the answers to the questions in the back of every chapter in the book so that a student need not incessantly struggle with the same. Maths comes for a total of marks, out of which 20 marks go from the internal assessment and the rest of the 80 marks come from Ncert Solutions For Class 10th Hindi Kritika Chapter 2 Math the written final exam. Written Final Exam. Internal Assessment. The following is a breakdown of the weightage marks for the internal assessment:. Multiple Assessment. Lab Practical. The following is the weightage breakdown for the final written exam:.
Chapter No. Chapter Name. However, soon it became a dogma as reflection, refraction etc. When photoelectric effect was discovered then it was found that wave theory of light cannot explain the phenomena and we came to a conclusion that light truely has dual characteristic.
It may behave both as wave and a particle. We may consider other similar examples from the history of science. Explain this beautiful aphorism on the nature and practice of science. Answer: Science is a systematised study of observations. A scientist patiently analyses these observations and comes out with certain laws. As an illustration, Tycho Brahe worked for twenty long years to make observations on planetary motions.
It is from this huge reservoir of observations that Kepler formulated his three famous laws of planetary motion. Thus, science is the art of the soluble just as politics is the art of the possible. Though India now has a large base in science and technology, which is fast expanding, it is still a long way from realising its potential of becoming a world leader in science. Name some important factors, which in your view have hindered the advancement of science in India. Answer:Some of the important factors which have hindered the growth of science in India are given below:.
Yet, all physicists believe in the existence of electrons. How will you refute his argument? Answer: Many phenomena which depend upon the existence of electrons have been predicted and actually observed in everyday life. There is no phenomenon which can be explained on the basis that ghosts exist though they are not seen. So, obviously, the comparison between two situations does not make any sense. The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai.
Given below are two explanations of this observed fact. Which of these strikes you as a scientific explanation? As a tribute to his bravery, nature through its inscrutable ways immortalised his face by imprinting it on the crab shells in that area.
Consequently, the particular shape of the crab shell survived longer and therefore in course of time the shape was genetically propagated. This is an example of evolution by artificial selection. Try to think out other examples of this kind], Answer: a The explanation given in option b strikes as a scientific explanation. The industrial revolution in England and Western Europe more than two centuries ago was triggered by some key scientific and technological advances.
What were these advances? Answer: Some of the key advances during that period in science and technology include the application of heat and thermodynamics to form the steam engine.
Discovery of electricity helped in designing dynamos and motors. Study of gravitation led to the study of motion and making guns and cannons. This gave power in the hands of western countries and they ruled over rest of the world.
The discovery of explosives not only helped army but also mineral exploration. These are some examples of scientific and technological advances which helped England and Europe to have their prominent positions in the world.
In fact, the progress in chemistry, physics and natural Ncert Solutions For Class 9 Math Chapter 10 sciences brought the industrial revolution in England and western Europe. It is often said that the world is witnessing now a second industrial revolution, which will transform the society as radically as did the first.
List some key contemporary areas of science and technology, which are responsible for this revolution. Answer: Some key contemporary areas of science and technology, which are chiefly responsible for a new industrial revolution taking place now and likely to take place in near future are: i Design of super-fast computers.
Write in about words a fiction piece based on your speculation on the science and technology of the twenty-second century. Both these laws are discussed in detail in chapter 3, science class 9.
There is one important question related to the chemical reaction. Is there any change in the total mass of the system when a chemical reaction takes place? According to the law of conservation of mass, mass can neither be created nor be destroyed. The same logic stands true for chemical reactions as well. Several experiments carried out by Lavoisier standardized this law.
The law of chemical combination is based on another law- the law of constant proportion. This law was also the result of experiments conducted by Lavoisier and Joseph L. According to the law of constant proportion, any compound is made by mixing two or more elements in a constant proportion, and this proportion does not change irrespective of the source of the compounds.
For example, in water, the ratio of the mass of Hydrogen to the mass of Oxygen is The ratio of the mass is the same for water from different sources. This law is also known as the law of definite proportion. The law of constant proportion is explained thoroughly in Class 9 Science Chapter 3. The issue that the scientist faced with the law of constant proportion is to provide a possible explanation for this.
Eminent scientist John Dalton tried to provide an explanation and introduced the concept of atoms. An atom is the smallest unit of matter. They are so small that thousands of them are stacked in your hair. The atom of one element is different from that of the other elements. Therefore, each of these atoms is depicted by different symbols. Dalton used different combinations of straight lines and circles for denoting various atoms.
However, the modern-day symbols consider the first or the first two letters of the element's name to denote an atom of the element. For example, Hydrogen is denoted by H and Oxygen by O.
In some cases, and the Latin names are also considered. For example, the Latin name of Potassium is Kalium, and it is denoted by K. A list of names of elements is shown in Atom and Molecules Class 9. Every atom has a definite mass, called the atomic mass unit. The atomic mass is the characteristic of the atom.
The concept of atomic mass supports the law of constant proportion and the law of conservation of mass. However, atoms cannot exist freely in nature.
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