ECAT Physics Online Test With Answers

image
image
image

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 If the value of C in a series RLC circuit is increased, the resonant frequency Is not affected Increase Remains the same Decreases
2 The phase angle of a series RLC circuit at resonance is 180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> None of the these
3 The total reactance of a series RLC circuit at resonance is zero Equal to the resistance Infinity Capacitive
4 SI unit of impedance is hertz henry ampere ohms
5 In series RC circuit when R=Xc, then the phase angle is 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 70<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
6 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current Decreases Increases Does not change Momentarily goes to zero
7 At resonance frequency the impedance of parallel resonance circuit is Maximum Minimum Zero None of the above
8 The impedance of RLC series resonance circuit at resonant frequency is Greater than R Equal to R Less than R None of these
9 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is 3525.0 volts 35.35 volts 353.5 volts 3.535 volts
10 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance 5.07 pF 50 pF 0.507 pF 507 pF
11 At resonance, the impedance of RLC series circuit is Maximum Zero Minimum Determinate
12 When either L or C is increased, the resonant frequency of the RLC series circuit Increases Decreases Remains the same Becomes zero
13 At resonance, the phase angle for RLC series resonance circuit equals 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 270<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
14 The power factor of resonant series circuit is 1 0 -1 0.5
15 In RLC series circuit, resonance occurs when X<sub>L &gt; Xc</sub> X<sub>L &lt; Xc</sub> X<sub>L = Xc</sub> None of these
16 A resonance curve for RLC series circuit is a plot of frequency versus Voltage Current Impedance Reactance
17 The r.m.s. value of alternating current is equal to its maximum value at angle of 60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 30<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
18 The device which allows only the flow of an A.C. through a circuit is Capacitor Inductor D.C. motor Battery
19 Alternating current can induce voltage because it has a High peak value Varying magnetic field Stronger field than direct curren Constant magnetic field
20 An A.C varies as a function of Current Voltage Time Charge
21 At higher frequency of the alternating current, the capacitive reactance Xc Increases Decreases Remains the same Increases only when the voltage increases
22 Which one of the following is correct? V<sub>o</sub>= 1.414 V<sub>rms</sub> I<sub>ams</sub>= 1.414 I<sub>o</sub> VO = 10.70 Vrms Both a and b
23 In an A.C circuit with resistor only, the current and voltage have a phase angle of 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> none of these
24 The basic circuit elements of A.C circuit are Resistor Inductor Capacitor All the three
25 During each cycle, alternating voltage reaches a peak value One time Two times Four times A number of times depending on the frequency
26 The average of A.C. current and voltage over a complete cycle is Maximum zero Neither zero nor maximum None of these
27 Carnot heat engine only used isothermal processes adiabatic processes both of them none of them
28 Sadi carnot described an ideal heat engine in 1820 1840 1860 1880
29 We cannot utilize the heat contents of oceans and atmosphere because there is no reservoir at the same temperature there is no reservoir at the temperature lower than any one of two there is no reservoir at the temperature higher than any one of two none of them
30 For the working of a heat engine, there must be a source of heat at high temperature a sink at low temperature both of them none of them
Download This Set
×