6th CBSE Science Material of Daily Use/Shorting of material into group
· The word material is related to things that are around us. · Matter is any abject around us that occupy space and has mass · Matter can found in around us in three state Solid , liquid and Gas · In solid state, particles of matter are tightly packed and having no gap between them. Due to this reason Solid have definite shape and volume. · In liquid state , particles of matter are loosely packed together have some space between then .due to this reason liquid have fix volume but no fix shape . · In Gas particles of matter are far from each other due to this gas have no fix volume and shape. · Both liquid and gas are called fluids as they can flow due to weak force of molecular attraction between particles. · We have large numbers of material around us and we need to know about their properties. To make study of the nature of different substance easy we have to divide it into group. · Shorting of material into group on the basis of similarity of different substance is called Classification. · Material around us classified on the basis of their properties: (a) Appearance or luster (b) Hardness or softness (c) Solubility (d) Floatation (e) Transparency (f) Conductivity of heat and light (g) Combustibility (h) Magnetism Q. What is luster? Ans: Materials around us have a particular type of shine called Luster like gold, silver, aluminum etc Q. Some metal can hammered into thin sheet without breaking into pieces. Name this property of metals? Ans: Malleability. Q. Some metal drawn into thin wire. Name this property of metals? Ans: Ductility. Q. Name material used to make chalk? Ans: Calcium carbonate Q. Why do houses have cement floor? Ans: Houses have cement floor because it can polished to make attractive. Q. Define soluble and insoluble substance? Ans: Material that mixed with water is called soluble e.g. acid, base, milk, lemon juice, sugar and alcohol. Material that do not mixed with water is called insoluble like oil, sand, alum etc Q. what will happen if you drop piece of chalk and sponge in to glass of water? Ans: Chalk and sponge absorb water due to gap between their particles. Q. Which material you prefer to use for furniture? Ans: Wood and Metal as they can polished and hard to break. Q. Classify material on the basis of conductivity? Ans: Materials have property to conduct electricity through them. This property is called conductivity. On the basis of that it can be divided into Good conductor and bad conductor. A substance which conducts electricity is called good conductor like silver, copper, aluminum. Q. Name the best conductor metal? Ans: Silver is best conductor. Q. Name a non metal that conduct current? Ans: Graphite is only non metal that conduct electricity. Q. What is the name of material that can scratch easily? Ans: hard Q. Name hardest and softest substance Ans: Diamond and talcum powder Q. What does cold drink contains. Ans: carbon dioxide gas, sugar and flavored syrup. Q.Why axe head is made up of iron? Ans: Because iron is cheap, hard and malleable. Q. Defines: Solute, solvent and solution? Ans: Solution: The mixture of two or more substance is called solution. Solute: A substance that is being dissolved is called Solute. Solvent: The substance in which solute dissolve. Q. Why ice floats on water? Ans: The density of ice is lower than water so, Ice floats on water. Q.What is transparency? Ans: The property of substance to allow light to pass through is called transparency. Q. What is Opaque object? Object that do not allow light to pass is called opaque like wood, metals etc. Object that allow light to pass partially is called Translucent. Glass, water, Oil paper etc. Q. Why handle of utensils made up of Plastic or wood? Ans: because Plastic or wood Q. What kind of substance do we see around us? Ans: we have two types of substance like man Plastic or wood made and natural. Q. Why do some substance sink or others floats to the beaker field with water? Ans: Some substances do not dissolve in water so they float unless sink. Q. Why we can smell something e.g. perfume? Ans: we can smell something e.g. perfume because smell the liquid floats in the air when evaporated. http://jsuniltutorial.weebly.com
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Let a, b, c are length of the sides and h is height to side of length c of ∆ ABC. We have S = (a + b + c)/2 So, 2s = a + b + c 2(s - a) = - a + b + c 2(s - b) = a - b + c 2(s - c) = a + b – c Let p + q = c as indicated.Then,
h2 = a2 - p2 -------------(1) Also, h2 = b2 - q 2 -------------- (ii) From (i) and (ii) Þ a2 - p2 = b2 - q 2 q2 = - a2 + p2 + b2 Since, q = c - p q2 = (c-p)2 Þ q2 = c2 + p2 -2pc Then, c2 + p2 -2pc = - a2 + p2 + b2 - 2pc = - a2 +b2 – c2 = - ( a2 -b2 + c2) p = ( a2 -b2 + c2)/2cNow, Put this value of p in equation (i) h2 = a2 - p2 h2 = ( a – p ) ( a + p ) h2 = {a – ( a2 -b2 + c2)/2c } {a + ( a2 -b2 + c2)/2c } h2 = {(2ac - a2 + b2 - c2)/2c}x{(2ac+ a2 - b2 + c2)/2c }h2 = {(b2 – (a - c)2 }{(a + c)2 – b2}/4c 2h2 = {(b – a + c) (b + a - c)}{(a + c + b)(a + c – b ) h2 = { 2(s - a) x 2(s - c) x 2s x2(s - b)}/4c2 h2 = { 4 s (s - a) x (s - c) x(s - b)}/c2 h = 2/c √ s (s - a) x (s - b) x(s - c) ½ h c = √ s (s - a) x (s - b) x(s - c) Area of triangle = √ s (s - a) x (s - b) x(s - c) 9th Area of triangles by Heron's formula Test Paper-1 9th Area of triangles by Heron's formula Test Paper-2 9th Area of triangles by Heron's formula Test Paper-3 Assignment for Class IX On : HERONS FORMULA 9th Heron formula proof and test questions Visit and Download Files Q. When a carpet is beaten with a stick, dust comes out of it. Explain.
Ans. Initially, the carpet and loose dust particles in it are at rest. But when the carpet is hit with a stick, it is suddenly be into motion, but the dust particles in it try to remain in the state of rest because of inertia of rest. And dust comes out of the carpet. Q. Why is it advisable to tie luggage kept on the roof of a bus with rope ? Ans. When the luggage is not tied with a rope to the bus, then due to inertia of rest, it will move back when the bus starts moving and will move forward due to inertia of motion when the bus stops. Thus it may fall down So it is advisable to tie the luggage kept on the roof of a bus with rope. First law of motion: Newton’s First law explains the “natural” motion of an object when it is left free. The law says that- Every object continues in its state of rest, or of uniform motion in a straight line with unchanging speed, unless compelled to do otherwise by forces acting upon it.So, naturally an object at rest will remain at rest and an object moving with a constant speed in a straight line will keep moving, unless they are disturbed by a force.This property of matter to continue its state of rest or of uniform motion is called “Inertia”. Hence, this law is also called the Law of Inertia. Second law of motion: Newton’s 2nd law of motion relates the external force (F) acting on a body with the mass (m) of the body; and is mathematically written as F = ma, ‘a’ is the acceleration of the body due to the force. It states that the acceleration of a body due to net external force acting on it is equal to the net force divided by the mass of the body.The difficulty you face while pushing or pulling a heavier box compared to a lighter box is explained by the 2nd law of motion. Third law of motion: This law deals with the forces between bodies that appear in pairs. It says that every action has an equal and opposite reaction. When you stand on the ground, your weight pushes the ground downwards; does this make the ground to move downward? No, because the ground pushes you upward with a force equal to your weight and hence these equal and opposite forces cancel out and you stand on the ground balanced. Force by you on the ground and force on you by the ground are two equal and opposite forces acting in pairs at the surface that is common to both you and the ground. Related post you may also like: IX Force and laws of motion solved questions NCERT solution Force and Law of motion for class 9 Guess Questions 2012 Ch-9 FORCE AND LAWS OF MOTION QUESTION BANK Class 9th Physics (Forces and Laws of motion) 9th Forces and Laws of motion teat paper-1 9th force and law of motion Test paper -2 9th Forces and Laws of motion teat papers unsolved CBSE PHYSICS Force and law of motion Numerical for class9 unsolved Solved Numerical Problems in 9th Force and Laws of motion Q. Why evaporation is called surface phenomenon? Ans : As evaporation occur on the surface of liquid. Q. List two processes from which it may be concluded that the particles of a gas move continuously. Ans: Compressibility and Brownian movement Q. At what temperature does solid ice and liquid water co-exist together? Ans: At 00C, the three phases of water co exist called triple point. Q. What is common among the three states of matter? Ans: They all contain molecules. Q. . Which property of gas is used in supplying oxygen cylinders to hospitals? Ans: Compressibility Q. a substance x was highly compressible and could easily be liquefied. it could also take the shape of the container. Predict the nature of the substance Ans: Gas Q. What is the state of water at 100 degree celsius, zero degree celsius and 4 degree celsius? Ans: The state of water in 100 degree celcius is gas, in 0 degree celcius it is solid and in 4 degree celcius it is liquid Q. can a liquid turn into vapor without heating? Ans: yes, By the process of evaporation as vaporization of water occur below the boiling point under atmospheric pressure. Q. What do you mean by Latent heat of Fusion? Ans: the heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance. For example, amount of heat required to melt ice at 0 ° C into water, at 0 ° C will be known as the Latent Heat of Fusion of ice. Q. What is compressibility? How it is negligible in solids? Ans: Compressibility is the ability of a substance to be reduced to its volume under pressure. Solids are incompressible as their particles are held together. So, we can tell that compressibility is negligible in solids. Q. Two cubes of ice are pressed hard between two palms. After releasing the pressure, the cubes join together. Why? Ans: Pressure is directly proportional to temperature when we apply pressure, temp. Increases then the ice in contact melts and it turns into water. when pressure is removed, the temperature decreases again and melted ice again freezes .Hence cubes join together. Q. Explain why ice has lower density than water? Ans: The mass per unit volume of a substance is called density (density = mass/volume). As the volume of a substance increases, its density decreases. When water changes into ice, space between particles increases. These spaces are larger as compared to the spaces present between the particles of water. Thus, the volume of ice is become greater than that of water. Hence, the density of ice became lower than that of water. As, a substance with lower density than water can float on water. Therefore, ice floats on water. Chapter : Matter In Our Surroundings
Module : 01 Contents: 1. Definition of matter 2. Physical nature of matter (i) Matter is made up of particles (ii) The particles of matter are very small 3. Characteristics of particles of matter (i) Particles of matter have spaces between them (ii) Particles are continuously moving. (iii) Particles attract each other Learning Objectives After studying the contents the students will be able to understand 1. What is matter? 2. What are the characteristics of the particles of matter? 3. What is diffusion? Key Terms: 1. Diffusion 2. Matter Activity Students are shown diffusion of potassium permanganate and copper sulphate crystals in water. Module : 02 Chapter : Matter In Our Surroundings Contents : 1. Three states of matter and their examples. 2. Properties of solids, liquids and gases. 3. Differences between solids, liquids and gases. Module :03 Chapter : Matter In Our Surroundings 2. Interchangeability between the three states of matter. 3. Effect of change of temperature and pressure. (i) Boiling and melting point of a substance of matter. (ii) Latent heat of fusion. (iii) Sublimation Learning Objectives After the Completion of the content the students will be able to understand. 1. How are the molecules arranged in different states of matter? 2. How can the different states of matter be interchanged? 3. What are the differences between the three states of matter? Key Terms: 1. Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point. 2. Latent heat of vaporization is the heat energy required to change 1 kg of liquid to gas at atmospheric pressure at its boiling point. 3. What is the effect of change of pressure on the various states of matter? 4. How does the temperature bring about the inter changeability between the three states of matter? Activity: Students are shown the sublimation of ammonium chloride. Practical No. 1 To determine the melting point of ice and the boiling point of water. Module : 04 & 05 Chapter : Matter In Our Surroundings Contents : 1. Conversion of Celsius scale to Kelvin scale and Vice versa. 2. Evaporation (i) Its definition and cause. (ii) Factors affecting evaporation. (iii) How does evaporation cause cooling? (iv) Difference between evaporation and boiling. Learning Objectives After the Completion of the content the students will be able to 1. Define evaporation 2. What are the various factors affecting evaporation. Key Terms: Students are given numericals on the conversions of temperature in Kelvin scale to celsius scale and vice versa. Matter in Our Surroundings extra scoring study material free IX Matter in Our Surroundings Notes IX Matter in Our Surroundings MCQ IX Matter in Our Surroundings [Solved] Visit to Download Files 6th Science : Cleaning of food or Separation solved question
Read and Download Separation of Substances merit gain Solved questions Read ad Download CBSE 6th Science : Separation of Substances solution Read and Download 6th Science : Separation of Substances Hots question Read and Download |
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