What Makes Things Visible? Introduction to Seeing What Makes Things Visible? Reflection of Light Laws of Reflection More to Know Features of Images by a Plane Mirror Additional Information Regular and Diffused Reflection Regular vs. Diffused Reflection More to Know:…
Testing Conductivity of Liquids Why is it Dangerous to Touch Electrical Appliances with Wet Hands? Testing Conductivity of Liquids Do Liquids Conduct Electricity? Why the Bulb May Not Glow Even if the Liquid Conducts Detecting Weak Currents Making a Tester…
Lightning In this chapter, we discuss two destructive natural phenomena: lightning and earthquakes. We will also learn how to minimize their destructive effects. What is Lightning? Ancient Beliefs Ancient Greeks and Electric Sparks Understanding Electric Charges Charging by Rubbing Types…
Sound Importance of Sound Sound is Produced by a Vibrating Body Sound Produced by Humans Voice Box (Larynx): Fun Fact Sound Needs a Medium for Propagation How Sound Travels Sound in Different Mediums Summary We Hear Sound through Our Ears…
Friction Force of Friction Factors Affecting Friction Understanding Friction Static vs. Sliding Friction Do You Know? Spring Balance Friction: A Necessary Evil Friction: Our Helper and Trouble-Maker The Downside of Friction Increasing and Reducing Friction Increasing Friction on Purpose Reducing…
Force – A Push or a Pull How Objects Move Everyday Examples Force – A Push or a Pull Forces are due to an Interaction Exploring Forces Key Points Think It Over More to Know Force and Motion A Force…
Adolescence and Puberty Introduction Adolescence and Puberty Changes at Puberty A. Increase in Height B. Change in Body Shape C. Voice Change D. Increased Activity of Sweat and Sebaceous Glands E. Development of Sex Organs F. Mental, Intellectual, and Emotional…
Reproduction in Animals Introduction Modes of Reproduction Sexual Reproduction Male Reproductive Organs Female Reproductive Organs Interesting Fact Fertilisation What is Fertilisation? Characteristics Inheritance Internal Fertilisation External Fertilisation Interesting Facts Development of Embryo Formation of Embryo Embryo to Foetus Hens and…
Deforestation and Its Causes Consequences of Deforestation Activities Conservation of Forest and Wildlife Types of Protected Areas Biosphere Reserve Flora and Fauna Endemic Species Wildlife Sanctuary National Park Red Data Book Migration Recycling of Paper Reforestation Chapter Summary: KEYWORDS
1.1 Combustion This chapter Combustion and Flame, focuses on the principles of combustion, types of flames, fire control methods, characteristics of fuels, and the environmental impact of burning fuels. Introduction to Fuels Burning with and without Flame What is Combustion?…
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