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Floating a needle on water
Thoroughly dry a steel needle. Place it on the tines of a dinner fork and gently smash the surface of the water in a dish with the fork. If you are careful the needle will float as you take the fork away. Look at the water surface closely. Can you see how the surface film seems to curve under the weight of the needle ?
Rutherford atomic model
Introduction : In any laboratory dealing with biological experiments, hazards can occur mainly due to chemicals and biological materials. In the previous exercise you have done th
Define Unicellular Organisms and Multicellular Organisms You may be aware that some organisms are made up of only one cell, while others have more than one cell. Well, the sing
How big is the Earth? The Earth size : is neither the largest nor smallest planet in our solar system. It is the largest of the non-gaseous planets (Mercury, Venus, Mars, and
glutamic acid standard estimation protocol
FIRST AID PROCEDURE FOR UNCONSCIOUS CASUALTIES : Let us now discuss the first aid procedure for unconscious casualties. The common causes of unconsciousness in a laboratory accide
Biological Basis of Aggression: Studies show that mild electrical stimulation of a specific region of the hypothalamus - produces aggressive behaviour in animals. When a cat'
How do Microbes Enter Our Body? You have learnt that microbes exist virtually everywhere, and hence our body is constantly exposed to them. They gain access to our body throu
To show that liquids exert pressure Connect two 15 cm lengths of glass tubing or two transparent plastic soda straws with a short length of rubber tubing and attach them to an
what is inside a volcano
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