ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 Computer chips are made from Conductors Semiconductors Insulators Both A and B
2 The branch of physics which concerned with the ultimate particles of which the universe is composed is known as SolidState physics Particle Physics Nuclear Physics Atomic Physics
3 The instrument used to gather information form the far side of the universe is Compound microscope Radio telescope Astronomical Telescope Simple microscope
4 At the present time, the main frontiers of fundamental science are 2 3 4 5
5 A choke coil is used as a resistance in d.c. circuit a.c. circuit d.c. potentiometer circuit wheatstone bridge
6 The A.M. transmission frequency range from 500-1000 KHz 540-1600 KHz 300-490 KHz 900-2040 KHz
7 Which of the following waves are more energetic radio waves infrared waves ultraviolet <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">γ-rays</span>
8 The electric field, magnetic field and the direction of their propagation are mutually perpendicular parallel none of these
9 A piece of wire along which charges are made to accelerate is known as transmitting antenna receiving antenna modulator nor of these
10 In a three phase a.c generator if the first coil has a phase 0, then the other two coils will have phases 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° - 120</span><span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 20<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° and 140</span><span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° and 240</span><span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° and 140</span><span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
11 In a three phase a.c. generator, there are 2 coils 3 coils 1 coild No coil
12 For a parallel resonant circuit at resonance, current from supply is minimum maximum zero none of these
13 The L-C parallel circuit the capacitor draws a leading current lagging current main current none of these
14 The circuit in which current and voltage are in phase, the power factor is zero 1 negative 0.83
15 The power dissipation in a pure inductive or capacitance circuit is maximum positive zero none
16 The ratio of the r.m.s value of the applied voltage to the r.m.s value of resulting a.c. is Impedance Inductance Reactance Resistance
17 Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called Choke impedance Semi-conductor None
18 Units of impedance are Henry Ohms moh Watt
19 The combined effect of resistance and reactance in a.c. circuit is called conductance resistance impedance choke
20 The reactance of a cell changes directly with frequency of a.c the inductance both a and b none of these
21 Current varies with voltage Inversely as square root Directly None of these
22 The basic circuit element in a d.c. circuit is a/an Inductor Resistor Capacitor Battery
23 The average value of current and voltage over a cycle is Positive Negative Zero May be positive or negative
24 The phase at the positive peak is <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Π/2</b></span> <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Π</b></span> 3<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Π/2</b></span> 2<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Π</b></span>
25 The r.m.s value of a.c. current is always positive negative zero all of these
26 The sum of positive and negative peak values are usually written as P-P value negative zero may be positive or negative
27 The highest value reached by voltage or current in one cycle is called root means square value peak value peak to peak value instantaneous value
28 The angle which specifies the instantaneous value of the alternating voltage or current is called phase critical angle angle of incidence all of these
29 The root mean square voltage for alternating current is All of these
30 The peak value of alternating voltage is given by
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