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PAGE NO : 25 Solution 1: All living organisms are made up of cells. Cells are the building blocks of all organisms and they give structural and functional stability to the organisms. All the...
PAGE NO : 13 Solution 1: Characteristics of living organisms are: All living organisms exhibit a definite shape and size. For example – Mango trees can be identified among all the other tress. Also...
PAGE NO : 6 Solution 1: Biology is the branch of science dealing with the study of living organisms. The two main branches of Biology are Botany and Zoology. Solution 2: Biology is the branch of...
In the world of education, Class 9 Chemistry often proves to be a challenging subject for students. With complex chemical reactions, formulas, and concepts to grasp, many students seek reliable...
PAGE NO :170 Solution 1: On heating certain solids they don’t melt and directly get converted to their gaseous form, this process of direct conversion of solids to their gaseous form is called as...
PAGE NO :146 Solution 1: (a) Symbol of hydrogen is ‘H’ and its molecular formula is H 2 . (b) 2 H means 2 atoms of hydrogen while H 2 means one molecule of hydrogen. (c) Lavoisier gave “Hydrogen” its...
PAGE NO :113 Solution 1: Solution 2: Solution 3: (a) Mass of an atom – Protons and neutrons (b) Size of an atom – Electrons Solution 4: Three fundamental particles of an atom are- Proton Electron...
PAGE NO :96 Solution 1: The molecular formula of water is H 2 O, this shows that water is not an element but it is a compound made up of two elements hydrogen and oxygen combined in a fixed ratio,...
PAGE NO :74 Solution 1: A physical change is a temporary change in which no new substance is formed and the composition or identity of the substance is not altered although certain specific physical...
PAGE NO : 153 Solution 1: Population: It is the total number of individuals of a species found in a particular area. Sanitation: It refers to the formulation and application of measures intended to...
PAGE NO :56 Solution 1: Symbol – It is the short form or abbreviation used for the name of an element. It represents one atom of that element. Formula – Formula of a compound represents the...
PAGE NO :41 Solution 1: Elements: An element is a pure substance which can neither be broken down into simpler substances nor formed from two or more simpler substances by any known physical or...
PAGE NO :21 Solution 1: An ideal gas can be characterized by three state variables: Absolute pressure (P), Volume (V), and Absolute temperature (T). Solution 2: Solution 3: Solution 4: Solution 5:...
PAGE NO :8 Solution 1: Matter is anything around us which occupies space and has mass. Example- Coal, Copper, Water, Oxygen, Kerosene Key: Matter occupies space and has mass. Solution 2: The...
In the realm of academic excellence, having access to reliable study materials is paramount. When it comes to mastering the subject of Physics in Class 9, students often seek effective solutions and...
PAGE NO: 323 Solution 1: Positive and negative are the two kind of charges. Solution 2: Net charge on an atom is zero. Solution 3: 10 is the number of electrons present in Na + . Solution 4: An atom...
PAGE NO: 320 Solution 1: Natural magnet is the deposits of the iron ore which has the attracting property of iron The properties of natural magnet are : The magnet has the directive property, when it...
PAGE NO: 312 Solution 1: The flow of electrons in a particular direction in a conductor is called an electric current. Solution 2: An electric cell is the source of electric current in which chemical...
PAGE NO: 300 Solution 1: Electrostatics is defined as the study of charges at rest. Solution 2: Frictional electricity is also known as static electricity. Solution 3: Thales of Miletus was the...
PAGE NO: 284 Solution 1: The frequency of sound is defined as the number of vibrations produced by the sound producing object per second. Solution 2: S.I unit of frequency is hertz. Solution 3: One...