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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Physics MCQs for Class 12 with Answers Chapter 11 Dual Nature of Matter and Radiation
Last modified on:5 years agoReading Time:24MinutesQ.1. Cathode ray consists of(a) photons (b) electrons(c) protons (d) α-particles Answer Answer: (b) Cathode ray consists of electrons Q.2. A discharge takes place between the two electrodes on applying the electric field to the gas in the discharge tube. The cause of this fluorescence was attributed to(a) the radiations which…
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Physics MCQs for Class 12 with Answers Chapter 12 Atoms
Last modified on:5 years agoReading Time:27MinutesQ.1. Balmer series lies in which spectrum?(a) visible(b) ultraviolet(c) infrared(d) partially visible, partially infrared Answer Answer: (b) Q.2. In Bohr model of hydrogen atom, let P.E. represents potential energy and T.E. represents the total energy. In going to a higher level.(a) P. E. decreases, T.E. increases(b) P. E. increases, T.E. decreases(c)…
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Physics MCQs for Class 12 with Answers Chapter 13 Nuclei
Last modified on:5 years agoReading Time:24MinutesMCQ based on Nuclei: Q.1. For a nuclear fusion process, suitable nuclei are(a) any nuclei(b) heavy nuclei(c) lighter nuclei(d) nuclei lying in the middle of periodic table Answer Answer: (c) Q.2. In the uranium radioactive series, the initial nucleus is 92U238 and that the final nucleus is 82Pb206. When uranium nucleus…
