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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 ?
Fingerprinting the Stars: Astronomers use various methods to measure the distances to stars. For determining the distances to nearby stars, the method of stellar parallax is
Explain the Hypoxic Hypoxia It is a hypoxia resulting from defective oxygenation of the blood in the lungs. It is a problem in high altitudes where pO 2 of the arterial blood
Describe the typical conditions neccessary for fossil formation
Explain parasympathetic Nerves System Another system that runs parallel to the sympathetic system is termed as the parasympathetic system. This system has an effect just opposi
What is permanent wilting percentage As plants absorb water from a soil, they lose most of it through evaporation at the leaf surface. Some water is also lost by evaporation d
Explain the Menstrual Phase - Menstrual Cycle If the ovum is not fertilized, a high level of progesterone in the blood inhibits the activity of pituitary gland and the producti
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
1. The red shift seen in all distant galaxies, whose size is proportional to its distance from us, what effect will this have on planet Earth?
Explain the Functions of Gastric Juice - Antiseptic Action Antiseptic action: Hydrochloric acid in the gastric juice acts as a barrier to the passage of certain microorganisms
WHAT IS THE OCEAN''S COASTLINE''S LIVING AND NON-LIVING THINGS?
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