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Floating in different liquids
Obtain a tall, slender glass jar, test tube or bottle, and the following liquids: mercury, carbon tetrachloride, water and kerosene. You will also require a small iron or steel ball such as a ball bearing, or iron nut or bolt; a small piece of ebony or some other wood that sinks in water; a piece of paraffin wax; and a piece of cork. First pour some mercury into the glass jar, then some carbon tetra- chloride, some water and some kerosene.
Fire Barriers : When a fire starts in a building it spreads quickly by: a) Radiation - Intense heat radiates to neighbouring surfaces which are rapidly heated to ignition poi
Pollution due to Radiations: Hazards of nuclear radiations are extremely serious, because they upset the genetic make up of the living beings. Environmental pollution from
Explain in detail about the Sedimentary rocks Sedimentary rocks are formed from the breakdown of igneous rocks. These rocks are broken apart by plant roots, ice wedges, and
STERILIZATION OF GLASSWARE Activity is related activities. Whenever you require the glassware for doing an experiment you can follow the procedure given in Activity independent
Use of natural resources: you studied about various natural resources such as land, water, soil, minerals etc. You know that these resources are limited and precious. Therefore
Renaissance (1440-1540): The Renaissance was a revolutionary movement. It marked a definite and deliberate break with the past. It swept away the medieval forms of economy, of
Give the common name of the historic mineral that was the original source of radium and the first substance in which helium was discovered on earth: Pitchblende
Temperature variations in glacial regions In glacial regions of the world or during forest fires the rocks are exposed to extreme temperatures. Since the conduction of heat is
Define Specific Defence Mechanism In the section on white blood cells, we learnt that whenever a germ or infection enters our body, the WBCs snap to attention and destroy the c
least atomic volume
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