ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Electron volt is the unit of. Potential difference Energy Resistance Capacitance
2 The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is Q=V/C Q=C/V Q=1/2CV Q=CV
3 Electron volt is the unit of Potential difference Energy Resistance Capacitance
4 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy Ve V/e e/V 2Ve
5 One joule is equal to 1.6 x 10<sup>19</sup>eV 6.25 x 10<sup>18</sup>eV 1.6 x 18<sup>18</sup>eV 6.25 x 10<sup>19</sup>eV
6 One electron volt is equal to 1.6 x 1019eV 6.25 x 1018 eV 1.6 x 1018 eV 6.25 x 1019eV
7 When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to One joule One erg One electron volt None of these
8 The earth's potential is taken as Negative Positive Zero Infinite
9 The electric lines of force are Imaginary Physically existing everywhere Physically existing near the charge All of the above
10 Which one of the following is the unit of electric field intensity JC<sup>-1</sup> Vm<sup>-1</sup> Cm<sup>-1</sup> CJ<sup>-1</sup>
11 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be Negative Positive Infinite Zero
12 The electric flux from a closed surface Is independent of the shape of the surface Depends on the charge enclosed by the surface Both a and b None of the above
13 The electric flux is linked with a surface will be maximum when The surface is held parallel to the electric field The surface is held perpendicular to the electric field The surface makes an angle of 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° with the electric field</span> All of the above
14 The SI unit of electric flux is Weber Nm<sup>2</sup>C<sup>-1</sup> NmC<sup>-1</sup> Nm<sup>-2</sup>C
15 Electric flux is defined by the relation E.A. E x A E/A none of these
16 The dot product of electric field intensity E and vector area A is called Electric potential Electric flux Electric field Magnetic field
17 The SI unit of electric field intensity is CN<sup>-1</sup> NC<sup>-1</sup>or Vm<sup>-1</sup> JC<sup>-1</sup> AV<sup>-1</sup>
18 An electric charge at rest is Only an electric field Only a magnetic field Both electric and magnetic fields None of the above
19 A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy 200 J 100 J 1000 J 400 J
20 One coulomb of charge is created by 10 electrons 1.6 x 10<sup>-19</sup>electrons 6.25 x 10<sup>18</sup>electrons 6.25 x 10<sup>21</sup>electrons
21 The electric field will be uniform Near a positive point charge Near a negative point charge Between two oppositely charged parallel metal plates None of above
22 Which one of the following has larger value of relative permitivity Erat room temperature? Vaccum Air Glass Water
23 If electric and gravitational force on an electron in a uniform electric field will be E=mg/q E=q/mg E=,g/q E=qg/m
24 Coulomb force, when any material medium is placed between two charges Increases Decreases Remain unchanged None of these
25 The minimum charge on any object can not be less than 1.6 x 10<sup>-19</sup>C 3.2 x 10<sup>-19</sup>C 1.0 C 4.8 x 10<sup>-19</sup>C
26 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately 9.8 24 x 10<sup>19</sup> 24 x 10<sup>42</sup> 24 x 10<sup>-44</sup>
27 The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to Coulomb's law Gauss's law Biot-Sarwat law Ampere's law
28 The electric field intensity at a point due to a point charge Falls off inversely as the distance Falls off inversely as the square of distance Remains unchanged with distance Increase directly as square of distance
29 Coulomb's force between two point charges depends upon Magnitude of charges Distance between them Medium in which they are located All of the above
30 The concept of field theory was put forward by Franklin Kepler Oersted Michael Faraday
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