ECAT Pre General Science Physics Chapter 12 Electrostatics Online Test With Answers

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ECAT Pre General Science Physics Chapter 12 Electrostatics Online Test

Sr. # Questions Answers Choice
1 Heating effect caused by an electric circuit is written H = I<sup>2</sup>Rt H = I<sup>2</sup>R H = IR<sup>2</sup>t H = IR<sup>2</sup>
2 Electric generators which convert mechanical energy into solar energy thermal energy kinetic energy electrical energy
3 Solar cell converts sunlight directly into potential energy thermal energy mechanical energy electrical energy
4 If a 40 watt light bulb burns for 2 hours. how much heat is generated 288 x 10<sup>3</sup>J 288 x 10<sup>8</sup>J 288 x 10<sup>5</sup>J 288 x 10<sup>6</sup>J
5 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of power current resistance temperature
6 The speed of randomly moving electrons depends upon pressure volume temperature mass
7 The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of negative charges positive charges protons electrons
8 The charge carriers in gases are electrons ions protons ions and electrons
9 The charge carriers in electrolyte are positive and negative protons electrons ions none of these
10 The relation between charge 'Q' and current 'I' is given by Q = I/t Q = It Q = I<sup>2</sup>t Q = I<sup>2</sup>/t
11 Which of the following represents an electric current? C<sup>-1</sup> CS<sup>-1</sup> J.S<sup>-1</sup> dynes<sup>-1</sup>
12 The SI unit of current is watt coulomb volt ampere
13 One coulomb per second is equal to One volt One ampere One hom One henry
14 The charge per unit time through any cross-section of a conductor is called capacitance electric power current potential difference
15 Free electrons are tightly bound fixed loosely bound tightly fixed
16 The current through a metallic conductor is due to the motion of protons neutrons electrons free electrons
17 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called Time constant Decay constant None of these All of above
18 Capacitance of two or more capacitors Increases in series combination Increases in parallel combination Remains unchanged None of the above
19 The electric intensity at infinite distance from the point charge will be Infinite Positive Zero Negative
20 The electric intensity outside the two oppositely charged parallel metal plates is Maximum Minimum Zero Infinite
21 The energy stored in a charge capacitor 1/2CV<sup>2</sup> 1/2C<sup>2</sup>V 1/2C/V<sup>2</sup> None of these
22 In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes Four-fold One-half One-fourth Zero
23 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
24 Surface density of charge is defined as Charge per unit volume Charge per unit length Charge per unit area Charge per unit mass
25 The SI unit of capacitance is Farad Henry Ohm Volt
26 Electron volt is the unit of. Potential difference Energy Resistance Capacitance
27 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
28 Electron volt is the unit of Potential difference Energy Resistance Capacitance
29 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy Ve V/e e/V 2Ve
30 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
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