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To study the formation of a drop of liquid Gently pour aniline into a large beaker of cold water unless a layer about half an inch deep accumulates at the bottom. Place the bea
Objectives After studying this unit, you should be able to: 1. Categorise different radiations into ionising and no ionising types, 2. Explain the effects of radiations
Improvement of Techniques and Crafts : In this period, there was a spurt in agriculture, as new techniques and seeds were introduced. More importantly, the crafts greatly improv
Origins of Science: We have seen that the primitive human beings acquired different kinds of knowledge from the use of implements and tools, from cooking on fire. from huntin
Making a 'gusher' with compressed air Secure a large narrow-necked bottle like as is used for soda water. Place a single-hole stopper in the bottle. By the stopper put a 10- cm
Compute for 3 H the mean energy per nuclear disintegration, Δ. The SI unit for Δ is kg Gy Bq -1 s -1 identical with J Bq -1 S -1 . The effective half-life for tritium in body w
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Lifting the water surface Bend the pointed end of a pin or use a piece of fine wire to make a hook. File the point of the hook unless it is very sharp. Put your eye on a level
Fertilizers pollute our ____system when____fertilizers run off from_____and animal______runs off from______and________.
A simple equal-arm lever Make a wooden base 15 cm square and 2 cm thick. In the centre of the base fasten one more block of wood 4 cm square and 3 cm thick. Fasten to two sides
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