ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 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
2 Electric flux is defined by the relation E.A. E x A E/A none of these
3 The dot product of electric field intensity E and vector area A is called Electric potential Electric flux Electric field Magnetic field
4 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>
5 An electric charge at rest is Only an electric field Only a magnetic field Both electric and magnetic fields None of the above
6 A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy 200 J 100 J 1000 J 400 J
7 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
8 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
9 Which one of the following has larger value of relative permitivity Erat room temperature? Vaccum Air Glass Water
10 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
11 Coulomb force, when any material medium is placed between two charges Increases Decreases Remain unchanged None of these
12 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
13 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>
14 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
15 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
16 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
17 The concept of field theory was put forward by Franklin Kepler Oersted Michael Faraday
18 The value of electrical constant of proportionality k is 9 x 10<sup>9</sup>Nm<sup>2</sup>C<sup>-2</sup> 9 x 10<sup>-9</sup>Nm<sup>2</sup>C<sup>-2</sup> 9 x 10<sup>10</sup>Nm<sup>2</sup>C<sup>2</sup> 9.85 x 10<sup>-12</sup>N<sup>-1</sup>C<sup>-2</sup>
19 The SI unit of permitivity is Nm<sup>2</sup>C<sup>2</sup> N<sup>-1</sup>m<sup>-2</sup>C<sup>2</sup> NmC<sup>2</sup> Nm<sup>2</sup>C<sup>-1</sup>
20 If the two charges in Coulomb's law have double distance between them, then electric force Becomes two-fold Becomes four-fold Remains the same None of these
21 Which of the following diode is used for the detection of light photo diode light emitting diode photo voltaic cell all of them
22 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted. photo diode light emitting diode photo voltaic cell all of them
23 In which of the following components, pn-junction is used light emitting diode photo diode photo voltaic cell all of these
24 The circuit which is used to smooth the output voltage of the full-wave rectification is known as transformer rectifier filter none of these
25 The bridge circuit of full wave rectification uses one diode two diode three diode four diode
26 In half wave rectification both halves of the input voltage is used only one half of the input voltage is used either of these none of these
27 During the negative half-cycle of the half-wave rectification, the diode does not conduct conducts either of these none of these
28 During the positive half-cycle in the half-wave rectification,the diode does not conduct conducts either of these neither of these
29 The output voltage of half wave rectification is in the form of a smooth curve a smooth wave pulses all of the above
30 Conversion of alternating current into direct current is called amplification rectification conduction polarization
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