Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 The capacitance of a parallel plate capacitor depends upon Area of the plates Separation between the plates Medium between the plates All of the above
2 Surface density of charge is defined as Charge per unit volume Charge per unit length Charge per unit area Charge per unit mass
3 The SI unit of capacitance is Farad Henry Ohm Volt
4 Electron volt is the unit of. Potential difference Energy Resistance Capacitance
5 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
6 Electron volt is the unit of Potential difference Energy Resistance Capacitance
7 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy Ve V/e e/V 2Ve
8 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
9 One electron volt is equal to 1.6 x 1019eV 6.25 x 1018 eV 1.6 x 1018 eV 6.25 x 1019eV
10 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
11 The earth's potential is taken as Negative Positive Zero Infinite
12 The electric lines of force are Imaginary Physically existing everywhere Physically existing near the charge All of the above
13 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>
14 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be Negative Positive Infinite Zero
15 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
16 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
17 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
18 Electric flux is defined by the relation E.A. E x A E/A none of these
19 The dot product of electric field intensity E and vector area A is called Electric potential Electric flux Electric field Magnetic field
20 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>
21 An electric charge at rest is Only an electric field Only a magnetic field Both electric and magnetic fields None of the above
22 A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy 200 J 100 J 1000 J 400 J
23 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
24 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
25 Which one of the following has larger value of relative permitivity Erat room temperature? Vaccum Air Glass Water
26 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
27 Coulomb force, when any material medium is placed between two charges Increases Decreases Remain unchanged None of these
28 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
29 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>
30 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
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