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 9 Science Chapter 9 Force and Laws of Motion
Last modified on:5 years agoReading Time:18MinutesExtra Questions For Class 9 Science Chapter 9 Force and Laws of Motion Very Short Answer Type Questions (One Mark Each) Q.1. Give the net force acting on a body at rest. Answer Ans. Net force acting on a body at rest is zero. Q.2. State the meaning of balanced force.…
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Extra Questions For Class 9 Science Chapter 7 Diversity in living organisms
Last modified on:5 years agoReading Time:15MinutesExtra Questions For Class 9 Science Chapter 7 Diversity in living organisms Very Short Answer Type Questions (One Mark Each) Q.1. What is classification of organisms? Answer Ans. Arrangement of organisms into groups or sets on the basis of similarities and differences is termed classification. Q.2. Which organisation state set rule…
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Extra Questions For Class 9 Science Chapter 3 Atoms and Molecules
Last modified on:5 years agoReading Time:12MinutesExtra Questions For Class 9 Science Chapter 5 Fundamental Unit of Life Very Short Answer Type Questions (One Mark Each) Q.1. What is Avogadro’s constant ? Answer Ans. Avogadro’s constant is the number of particles (atoms, ions or molecules) present in mole of the substance. Its value is 6.022 x 1023.…
