PPSC Physics Chapter 6 Electricity and Magnetism With Answers

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PPSC Physics Chapter 6 Electricity and Magnetism

Sr. # Questions Answers Choice
1 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>
2 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
3 The resistance of a coil changes directly with The current of A.C. The frequency of A.C The inductance Both B and C
4 At series resonance in L-C-R circuit the impedance is equal to. Ohmic resistance Inductive reactance Capacitive reactance Inductive reactance minus capacitive reactance
5 In which of the following the loss of energy is less. Direct current Alternating current Thermoelectricity Photoelectricity
6 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>
7 At high frequency the current through a capacitor will be Small Zero Large Infinity
8 At low frequency the value of resistance of certain capacitors is. small Large Moderate Unmeasurable
9 The sum of the positive and negative peak values is known as. Peak value Average value Instantaneous value Peak to peak value
10 Which current can pass through a capacitor continuously. Alternating current Direct current Eddy current Pulsating current
11 The basic circuit element is a D.C. circuit is An inductor A resistor A capacitor A battery
12 The rms value of alternating current is always Infinity Unity Positive Negative
13 The sum of positive and negative peak values are usually written as. rms value p-p value Peak value Instantaneous value
14 The value of voltage or current that exists in a circuit at any instant of time measured from some reference point is its. Peak value Peak to peak value Instantaneous value Average value
15 The highest value reached by the voltage or current in one cycle is its. Top value Maximum value Average value Peak value
16 With high frequencies capacitive reactance Increases Decreases Becomes double Becomes half
17 The value of power factor in an LCR sense circuit at resonance is. Zero 0.5 unity Infinity
18 A pure choke consumes No power Maximum power Minimum power Average power
19 The resistance of 10 micro F capacitance, when connected to A D.C. circuit is. Zero Unity -1 Infinity
20 A 100 Hz A.C. is following in A 7 mH inductance What is its reactane. 0.4 Ohms 4.4 Ohms 7Ohms 44 Ohms
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