Table of Contents
Charging of Insulators
Since charge cannot flow through insulators, neither conduction nor induction can be used to charge, insulators, so in order to charge an insulator friction is used. Whenever an insulator is rubbed against a body exchange of electrons takes place between the two. This results in appearance of equal and opposite charges on the insulator and the other body. Thus the insulator is charged.
For example rubbing of plastic with fur, silk with glass causes charging of these things.
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Reynolds Number
Last modified on:3 years agoReading Time:10MinutesWhat is Reynolds Number? The Reynolds number (Re) is a dimensionless parameter used in fluid mechanics to characterize the flow of a fluid (liquid or gas) around an object or through a conduit. It relates the inertial forces to the viscous forces in the fluid and helps determine the type of…
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Extra Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation
Last modified on:4 years agoReading Time:8MinutesExtra Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation Q.1. Define biodiversity.Ans. The occurrence of different types of genes, gene pools, species, habitats and ecosystems in a particular place and various parts of earth is called biodiversity. Q.2. What is mass extinction?Ans. Due to natural calamities like volcanic eruptions,…
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Extra Questions for Class 12 Biology Chapter 14 Ecosystem
Last modified on:4 years agoReading Time:11MinutesExtra Questions for Class 12 Biology Chapter 14 Ecosystem Q.1. What is detritus?Ans. Dead organic matter or remains of plant such as leaves, bark, flower and dead remain of animals, including faecal matter constitute detritus. Q.2. Why is the rate of assimilation of energy at the herbivore level called secondary productivity?Ans.…
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Extra Questions for Class 12 Biology Chapter 13 Organisms and Populations
Last modified on:4 years agoReading Time:14MinutesExtra Questions for Class 12 Biology Chapter 13 Organisms and Populations Q.1. Name the interaction between sea anemone and the hermit crab that grows on it.Ans. Commensalism Q.2. Why are green algae not likely to be found in the deepest strata of the ocean?Ans. The wavelength of light at the deepest…
