Sound chapter Test class 8

Comments

Post a Comment

Popular posts from this blog

Class 6th- Chapterwise Notes

Class 6th Chapterwise Notes Chapter 1- Matter and its Nature 1. Anything that occupies space and has mass is called matter. 2. The space anything occupies is called its volume. 3. The amount of matter anything contains is called its mass. 4. Anything that does not matter but has the capacity to do work is energy. 5. Matter exists in three states-solid, liquid and gaseous. 6. The change in the state of matter from one to another is called interconversion of state. 7. On the basis of composition, the matter is classified as follows. Matter Pure Impure (or mixture) Elements Compounds or Metals Nonmetals • 8. An element is a substance that cannot be broken down into simpler substances by chemical means. 9. A compound is a substance that can be split or broken down into simpler substances by chemical means. 10. A substance is homogeneous if the different parts of it have the same property (behaviour) and composition. 11. A substance is heterogeneous if the different parts of it...
Read more

class 7th heat chapter notes

Image
GRADE VII SCIENCE CHAPTER: HEAT ( PART-II) Students, today we will discuss the following topics of the Chapter: Heat. Ø   Flow of heat Ø   Conduction Ø   Conductors & Insulators Ø   Convection Ø   Sea breeze Ø   Land breeze Ø   Radiation You will be provided with a video link of YouTube that will help you to understand it better. Most of the topics of this chapter are explained in the written form, as follow:   FLOW OF HEAT Students, do you know why the mercury in a thermometer rise when you place it under your tongue? This is because it gets heated and expands. The heat from your mouth flows to the glass bulb to the mercury. Heat can flow or travel through solids, liquids, gases and even through space. However it travels differently in different materials. There are three different ways in which heat travels: a)     Conduction b)     Convection c)     Radiation   CONDUC...
Read more

Flotation chapter-wise notes class 9

Image
Flotation Flotation When an object is placed on the surface of a liquid if the object float on the surface this condition is called flotation. Buoyancy The property of the liquid which makes object float on its surface. this property is called by buoyancy. Density It is defined as mass per unit volume. Formula Unit:   It has unit kilogram per cubic meters ( Kg / m 3  ). Relative density (RD) It is defined as the ratio of the density of the liquid to the density of the water at 4 degrees Celsius. Formula Relative density= density of the liquid /density of the water at 4 degree Celsius Relative density is constant it has no unit .  At 4 degrees Celsius water has a maximum density that's why we take the water at 4 degrees Celsius. Pressure Pressure is defined as a force acting per unit area. Formula Unit newton per square meters ( N/m 2 ) or pascal( Pa) Define one Pascal Pressure is said to be one Pascal when a force of ...
Read more