Physics ECAT Pre Engineering Chapter 14 Electromagnetism Online Test With Answers

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Physics ECAT Pre Engineering Chapter 14 Electromagnetism Online Test

Sr. # Questions Answers Choice
1 The voltage increases linearly with time velocity acceleration torque
2 How many number of anodes used in electron gun one two three six
3 Electron gun consist of three anodes heating cathode three anodes three anodes , heating cathode, grid
4 A beam of electrons is provided by an electron gun Suppray Injection None of these
5 Flurescent screen is a screen where visible spot vanishes is made becomes small and large none of these
6 The CRO deflects the beam of electrons, when they passes through uniform electric field gravitational field magnetic flax magnetic field
7 CRO deflects the beam of proton a-particle electron neutron
8 (CRO) Cathode ray oscilloscope is a device used for high speed velocity graph plotting time-velocity none of these
9 A magnetic force on an electron travelling with 108ms-1parallel to a field of strength 1 Wb m-2is Zero 10<sup>5 </sup>m 10<sup>-10</sup>N 10<sup>8</sup>N
10 The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by F=eVB F=e<sup>2</sup>V/B F=e/VB F=B<sup>2</sup>/ev
11 A charged particle moving at right angle to the magnetic field will experience minimum force maximum force zero moderate force
12 When charged particle is projected perpendicular to a uniform magnetic field its trajectory is circular elliptical cycloid straight line
13 Charge to mass ratio (e/m) of an electron is given by the relation e/m = 2V/Br<sup>2</sup> e/m = 2V/B<sup>2</sup>r e/m = 2V/B<sup>2</sup>r<sup>2</sup> e/m = V/2B<sup>2</sup>r<sup>2</sup>
14 The e/m of an electron moving in a circular path in a magnetic field is equal to V/Br V/B<sup>2</sup>r<sup>2</sup> V<sup>2</sup>/Br<sup>2</sup> V<sup>2</sup>/Br
15 Centripetal force for electron is given by mv<sup>2</sup>/ r mv / r<sup>2</sup> mv<sup>2</sup>/ r mr<sup>2</sup>/ v
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