ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 In a straight current carrying conductor, the direction of magnetic field can be found by right hand rule left hand rule head to tall rule none of these
2 The direction of lines of force depends upon the direction of voltage current charges none of these
3 The most suitable material for permanent magnet is cobalt iron steel alaminium
4 The field around a moving charge is called magnetic field conservative field non-conservative field none of these
5 The sources of magnetic field are isolated magnetic poles charges at rest charges in motion none of these
6 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>
7 Electric generators which convert mechanical energy into solar energy thermal energy kinetic energy electrical energy
8 Solar cell converts sunlight directly into potential energy thermal energy mechanical energy electrical energy
9 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
10 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
11 The speed of randomly moving electrons depends upon pressure volume temperature mass
12 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
13 The charge carriers in gases are electrons ions protons ions and electrons
14 The charge carriers in electrolyte are positive and negative protons electrons ions none of these
15 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
16 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>
17 The SI unit of current is watt coulomb volt ampere
18 One coulomb per second is equal to One volt One ampere One hom One henry
19 The charge per unit time through any cross-section of a conductor is called capacitance electric power current potential difference
20 Free electrons are tightly bound fixed loosely bound tightly fixed
21 The current through a metallic conductor is due to the motion of protons neutrons electrons free electrons
22 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
23 Capacitance of two or more capacitors Increases in series combination Increases in parallel combination Remains unchanged None of the above
24 The electric intensity at infinite distance from the point charge will be Infinite Positive Zero Negative
25 The electric intensity outside the two oppositely charged parallel metal plates is Maximum Minimum Zero Infinite
26 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
27 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
28 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
29 Surface density of charge is defined as Charge per unit volume Charge per unit length Charge per unit area Charge per unit mass
30 The SI unit of capacitance is Farad Henry Ohm Volt
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