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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Important Questions Class 12 Chemistry Chapter 12 – Aldehydes Ketones and Carboxylic Acids 1 Mark Questions
Last modified on:5 years agoReading Time:5Minutes1. Give one use of Formalin. Ans. Formalin is used as a disinfectant, preservative for biological specimens and in leather industry. 2. What is the chemical name of Tollen’s reagent and Fehling’s solution. Ans. Tollen’s reagent = Ammoniacal Silver Nitrate Fehlings solution = Sodium Potassium Tartarate. 3. Write the structure of alkenes…
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Important Questions Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers 1 Mark Questions
Last modified on:5 years agoReading Time:4Minutes1. Write IUPAC names of :- i. Ans. 5 – Methyloctan-3-ol ii. Ans. 1-Chloro propan-2-ol iii. Ans. Pentan – 1,3,4 – triol iv. Ans. 2 – Methylpropan -2-ol v. Ans. 1,3 – Dibromo – 4- chloro – 2- butanol vi. Ans. 5 – Chloro – 4 – ethyl – 5- methyl hexanol. vii. Ans. 2 – Phenyl ethanol…
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Important Questions Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes 1 Mark Questions
Last modified on:5 years agoReading Time:7Minutes 1. Give IUPAC names of following compounds (i). (ii). (iii). (iv). (v). (vi). (vii). (viii). (ix). (x). Ans. (i). 1, 3- Dibromobutane (ii). 1- Cholopropan-2-ol(iii). 2, 3 – Dibromo-1-chloro-3-methylpentane(iv). 2-Choloro-3-ethyl-2-methyl pentane(v). 1-Chloro-2-phenylethane(vi). 1-Chloro-1-phenyl ethane(vii). 1, 2, 3, 4, 5, 6- hexachlorocyclohexane(viii). 2, 2- Dihexyl 1, 1, 1-Trichloro ethane(ix). 4,…
