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Concise Selina Class 7 Physics Chapters:- Class Notes(Most Important Questions from each chapter) *Please click on the links given alongside the chapters to go to the notes. Physical Quantities and Measurement: https://novakidhs.blogspot.com/2022/09/physical-quantities-and-measurement_97.html Motion:  https://novakidhs.blogspot.com/2022/09/motion-class-notescorrected-class-7.html Energy:  https://novakidhs.blogspot.com/2022/09/energy-class-notes-class-7-physics.html Light Energy:  https://novakidhs.blogspot.com/2022/09/light-energy-most-important-questions.html Heat:  Sound:  Electricity and Magnetism:  Check out more resources (Click on the links alongside the topics):- Top ten practices to fetch better marks during exams:  https://novakidhs.blogspot.com/2022/10/top-ten-tips-for-exams-fetch-better.html Research-Backed Study Strategies:  https://novakidhs.blogspot.com/p/tips-and-tricks.html Brief Summaries of Best Motivational Books for Students ...

Selina Concise ICSE Solutions for Class 7 Chemistry  Chapter 4 Atoms, Molecules and Radicals Points to Remember : 1. Atoms of the most elements are composed of still smaller particles known as fundamental particles or subatomic particles. They are  protons ,  electrons  and  neutrons . 2. Protons are the positively charged particles present in an atom. 3. Electrons are the negatively charged particles present in an atom and its mass is 1/1837 the mass of one hydrogen atom. 4. Neutrons are particles with no electrical charge. Its mass is equal to one atomic mass unit. 5. The central part of an atom is called nucleus, which contains both protons and neutrons. 6. Shells or orbits around the nucleus. 7. Atomic number  refers to the number of protons present in an atom. It is denoted by the alphabet Z. 8. Mass number — Mass number is the sum of number of protons and neutrons present in the nucleus of an atom. Mass number (A) = Number of protons + Number of neutr...

Selina Concise ICSE Solutions for Class 7 Chemistry  Chapter 3 Elements, Compounds and Mixtures Points to Remember : 1. Every substance is made up of very tiny particles, called molecules. Molecules are formed from even smaller particles called atoms. 2. Element—  (a) Element is the simplest pure substance. It cannot be divided further into simpler substances by any chemical method, e.g. oxygen, hydrogen, sulphur, etc. (b) At present 116 elements are known, of which 92 are natural elements. 3. Based on their properties, elements are classified into : metals, non-metals, metalloids, noble gases. 4. Metals are ductile, malleable, good conductors of heat and electricity, high melting and boiling points. Metals are sonorous, e.g., Iron, Gold, Silver, etc. 5. Non-metals are solids and brittle in nature, bad conductor of heat and electricity (exception Graphite) low melting and boiling points, e.g. sulphur, carbon, hydrogen, etc. 6. Metalloids—  These elements show properties ...

Chapter 1 Physical Quantities and Measurement Selina Concise for Class 7 Physics  Points to Remember The mass of a body is the quantity of matter contained in a body regardless of its volume or any force acting on it.  The weight of a body is the force with which every body is attracted towards its centre.  The unit of mass in S.I. system is kilogram (kg). Higher units of mass are quintal and metric tonne.  The weight of body changes with acceleration due to gravity.  Weight is zero at the centre of the earth.  Mass per unit volume of a substance is called density of the body.  The unit of density in S.I. system is kg m -3  and gcm -3  in C.G.S. system.  The density in S.I. system is 1000 × numerical value in C.G.S. system.  The density of liquids and gases decreases or increases with the rise or fall in temperature. The cycle of upward and downward movements of the fluid form currents in the medium which are known as convectio...

Chapter 2 Motion Selina Concise for Class 7 Physics  Points to Remember  Motion— Motion is the change in position with respect to a set of stationary landmarks.  Types of motion are translatory, rotatory and oscillatory.  A body is said to move in a translatory motion if the whole body moves through the same distance in the same interval of time.  A body is said to be in rotatory motion if it moves about a fixed point without changing the radius of its motion.  A body is said to be in oscillatory motion if it moves to and fro about its mean position.  A body is said to be in vibratory motion if the body moves to and fro in a particular style.  Oscillation of pendulum is one complete to and fro motion.  The maximum displacement on either side of a mean position is called amplitude.  A motion which repeats itself at regular intervals of time is called periodic motion.  A physical quantity which has only magnitude and no direction is c...