PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 In L - C parallel circuit the coil draws a. Lagging current Leading current Lagging voltage Leading voltage
2 In a parallel resonant circuit, at resonance Current is maximum Voltage is maximum Impedance is minimum Impedance is zero
3 In a series resonant circuit, the current at resonance is. Maximum Minimum Zero Sometimes maximum and sometimes minimum
4 In L-C parallel circuit the capacitor draws a Lagging current Leading current Lagging voltage Leading voltage
5 The rms value of emf in a circuit is given by a factor of. 0.637 0.7 0.707 1.11
6 The impedance of the circuit at resonance frequency is Minimum Maximum Zero Infinity
7 Susceptance of a circuit is the reciprocal of. Admittance Resistance Reactance Impedance
8 The circuit in which current and voltage are in phase the power factor is. Zero Unity Double 4 times
9 In a purely inductive circuit, the current Lags behind the emf by 90<sup>o</sup> Leads the emf by 90 <sup>o</sup> Is in phase with emf May lag or lead the emf
10 When Xc = Xl, this condition is called. Equality Balanced Resonance Equlibrium
11 The effective resistance offered by the resistance capacitance and inductance in an A.C. circuit is known as Impedance Resistance Capacitance <div>Reactance</div>
12 In a R-L-C series circuit, when the frequency of A.C. source is high the circuit is. R-L Circuit R-C circuit L-C circuit R-L or R-C
13 In the equation P = IV cos Theta Cos theta is known as Phase angle Liming angle Phase Power factor
14 The power dissipation in a pure inductive or capacitive circuit is. Maximum Minimum Zero Infinity
15 In any L-C-R circuit Current lags the applied voltage Current leads the applied voltage Current sometimes leads and sometimes lags the applied voltage Current remains in phase with voltage
16 The ratio of the rms value of the applied voltage to the rms value of resulting A.C. is called. Reluctance Impedance Reactance Resistance
17 The combined effect of resistance and reactance's in A.C. circuit is called. Resistance Conductance Choke Impedance
18 Wattles current is said to flow when phase angle between virtual current and virtual voltage is 0<sup> o</sup> 90 <sup>o</sup> 180 <sup>o</sup> 270<sup> o</sup>
19 Such an inductor coil which does not consume energy and is often employed for controlling A.C. without consumption of energy is called. Reactance Choke Impendence Diode
20 The resistance of a coil changes directly with The current of A.C. The frequency of A.C The inductance Both B and C
21 At series resonance in L-C-R circuit the impedance is equal to. Ohmic resistance Inductive reactance Capacitive reactance Inductive reactance minus capacitive reactance
22 In which of the following the loss of energy is less. Direct current Alternating current Thermoelectricity Photoelectricity
23 The phase angle between the voltage and current is A.C. circuit though a resistor is. 0 <sup>o</sup> 45 <sup>o</sup> 90 <sup>o</sup> 180 <sup>o</sup>
24 At high frequency the current through a capacitor will be Small Zero Large Infinity
25 At low frequency the value of resistance of certain capacitors is. small Large Moderate Unmeasurable
26 The sum of the positive and negative peak values is known as. Peak value Average value Instantaneous value Peak to peak value
27 Which current can pass through a capacitor continuously. Alternating current Direct current Eddy current Pulsating current
28 The basic circuit element is a D.C. circuit is An inductor A resistor A capacitor A battery
29 The rms value of alternating current is always Infinity Unity Positive Negative
30 The sum of positive and negative peak values are usually written as. rms value p-p value Peak value Instantaneous value
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