sawscsscicl8sci

 REVISION WORKSHEET                         REVISION WORKSHEET -1 (LIGHT) Hello Learner,  DO THE FOLLOWING MCQ IN YOUR NOTEBOOK UNDER THE HEADING - REVISION WORKSHEET-1 (LIGHT) (A) Multiple Choice Questions 1. The light coming from the sun gets reflected from the surface of the earth is called ______. (i)  Earth Light          (ii) Moon Light          (iii) Sun Light             (iv) Space Light 2. The bouncing of light after striking a surface is called as ________. (i) Dispersion           (ii) Spectrum         (iii) Reflection               (iv) Refraction 3. The ______ layer acts as the reflecting surface, in a mirror. (i) Iron                (ii) Silver                (iii) Mercury                     (iv) Sodium 4. According to law of reflection, the relation between angle of incidence and angle of reflection is given as: (i) ∠i=∠r              (ii) ∠i > ∠r                 (iii) ∠i < ∠r                 (iv) ∠i ≠ ∠r 5. A toy is placed at 10 cm in front of a

Light Day 3 Dear Learners, Before you learn more about light, click on the link given below and do this assessment from the chapter- cell-structure and functions https://forms.gle/C3ECzxrfNBscUyVRA In the previous blog, we have learned about light and reflection of light. Let me help you to recall few important points 1. Regular and Irregular reflection. 2. Real and Virtual Image. Today, we will be learning about Characteristic of image formed  by a plane mirror and the  Ray diagram for the formation of image by a plane mirror. Happy Learning!😊 At the end of it, you will be able to: 1. tell the characteristic of image formed by plane mirror. 2. explain ray diagram for the formation of image by a plane mirror. 3. draw the ray diagram for the formation of image by a plane mirror. But, before we start the chapter you all should read page no 252, 253 of your text book. By doing this, it will be easier for you all understand the topic well. So, lets s

Dear Learners, BOYS, WE HAVE A GOOGLE MEET FROM 9am -9.20 am, PLEASE ATTEND IT(THE MEET ID HAS BEEN POSTED ON YOUR CLASS GROUP). AFTER 9.20 ,READ THE BLOG. In the previous blog, we have learned about light and reflection of light. Let me help you to recall few important points 1. Light is a form of energy that enable us to see. 2. There are two laws of reflections.  Today, we will be learning about regular and irregular reflection, real and virtual images. Happy Learning!😊 At the end of it, you will be able to: 1. Differentiate between regular and irregular reflection. 2. Differentiate between real and virtual image. so, lets start the chapter......... When a ray of light falls on a reflecting surface, it get reflected. the amount and the direction of the light reflected depends on the nature of the surface. Depending upon the nature of the reflecting surface, there are two types of reflections. Click the link:  https://www.youtube.com/watch?v=f0NtpGe

CLASS 8 CHAPTER 16 Light “If you are the light, you cast away the darkness.” ManHee Lee 😊  Dear Learners, Happy Learning!😊 At the end of today topic, you will be able to: 1. Define Light. 2. Expain  Reflection of Light and terms related to it. 3. state the laws of reflection. Important Instructions:  1. Make the new entry of the chapter in your index. 2. Start the chapter from a  fresh page.  3.Diagrams need to be drawn with pencil and should be well labelled. Lets begin!  click on the link below for an introduction to LIGHT.               https://www.youtube.com/watch?v=Xf_VZ8GxU1Y We see a variety of objects  around us. However, we are unable to see anything in a dark room. On lighting up the room, things become visible.  What makes things visible??? During the day,  sunlight helps us to see object. An object reflects light that falls on it. This reflected light is received by our eyes, enabling  us to see it. Light is

GOOD MORNING BOYS!  WORK FOR TODAYS CLASS- - Revisit all the eight posts of the lesson. -  Complete all the question-answers shared with you on your class group. - Read the lesson. Have a good day!

Dear Learners, Thank you for logging in! You're wonderful!😊   At the end of this class, you will be able to: 1. Define atmospheric Pressure. 2. Explain Pressure exerted by gasses through various activities. 3. Explain the role of a barometer. 4. State different types of a barometer. Happy Learning!😊 Pressure exerted by Gases: The pressure exerted by the air at any point on the earth is called  Atmospheric Pressure  at that point. Atmospheric Pressure decreases with altitude. https://youtu.be/S7868Z-g87Y Barometer Device to measure atmospheric pressure. https://youtu.be/GRxglLS1YWI Types of Barometer: Simple /Mercury barometer Fortin's barometer Aneroid barometer https://youtu.be/EkDhlzA-lwI   Assignment: Read pg. 184-187 from the textbook. Attempt Oral ques. given on pg. 187 ANSWER THESE ORALLY- Why does nose bleed at high altitude?  ( hint - difference in air pressure) Why is our body not crushed under

"Always Question, Always Wonder "  Dear Learners, Thank you for logging in! You're wonderful!😊   At the end of this class, you will be able to: 1. Define Fluids. 2. Explain Pressure exerted by liquids through various activities. 3. State and explain Pascal's Law. Happy Learning!😊 Pressure exerted by Fluids: Fluid: Gasses and liquids are collectively called as fluids. Pressure exerted by Liquids: A liquid contained in a vessel exerts pressure on its wall and bottom. 1. Pressure due to liquid increases with depth from the surface of the liquid. https://youtu.be/Cvp6mLWbgaM 2. The pressure of a liquid is the same in all the directions at the same depth. https://youtu.be/i42TaUiCNf0 3. The pressure of a liquid does not depend upon the shape and size of the container. https://youtu.be/_iiSHcycIUc 4. Pascal's Law: The pressure applied to a liquid is transmitted equally in all directions. https://youtu.be/dx2P7i1GPaw?t=9 As

In today's class,  we will revise what we have learned so far: The blog has some questions you will answer. You may use the previous blogs to answer them. DO THE WORKSHEET IN YOUR SCIENCE NOTEBOOK ,UNDER THE HEADING-  REVISION WORKSHEET REVISION WORKSHEET 1.    If a force of 200 N exerts a pressure of 20 Pa. Calculate the area under contact over which the force is applied. 2.    Calculate the pressure produced by a force of 800 N acting on an area of 2m 2 . 3.  A force of 1200 N acts on the surface of area 12 m 2 . What would be the pressure on the surface? 4.  A. 1 atm=___________ cm Hg      B. 1Kgf=____________gf 5. S.I unit of pressure is_____. 6. Sledges are not provided with wheels. Give reason. 7. Why are shoulder bags provided wit broad strap? 8. Why is a sharp knife more effective in cutting a fruit than a blunt knife? 9. Force per unit area is called________. 10. Pressure in solids depends upon_________&___________.

"Always Question, Always Wonder "  Dear Learners, Thank you for logging in! You're wonderful!😊   At the end of this class, you will be able to: 1. Define Pressure. 2. State the S.I unit of Pressure. 3. Estimate Pressure in solids. Happy Learning!😊 Pressure : The pressure is defined as the force acting on a unit area. Pressure = Force/Area Units of Pressure: S.I unit of P is newton per square metre, which is also called pascal (Pa). Other units: 1 atm (Atmospheric Pressure) 1atm = 76 cm of mercury column 1atm = 760 mm of mercury column. https://youtu.be/7fB0PNAfUa8?t=23  (check this video on Pressure and its examples) https://youtu.be/zlLpKzPz84Q  (check this video on Pressure applied in solids) Assignment: Read pg. 180-182 from the textbook. Solve e.g. 1 and 2 of pg. 181 in the notebook See you for the next class😊 Stay Happy! Stay Fantastic!

"Always Question, Always Wonder "  Dear Learners, Thank you for logging in! You're wonderful!😊   At the end of this class, you will be able to: 1. Distinguish between Balanced and Unbalanced forces. 2. State the effects caused by force. Happy Learning!😊 Balanced and unbalanced Forces: https://youtu.be/-Rjid6hQuww  ( Check this video on Balanced and Unbalanced Forces) Effects of Force: Force acting on a body may cause the following effects on it: 1. A force acting on a body can change its state of motion or rest. 2. A force can the direction of motion of a moving object. 3. A force can change the shape and size of an object. 4. a force can stop a moving object. 5. A force can change the speed of a moving object. https://youtu.be/QuFh8GYDf7A?t=17  (check this video on effects of force) Drill: 1.       1. .   What will be the net force acting on a body if 2 forces of 50 N each acts: a)        In the same dire