PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 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
2 The highest value reached by the voltage or current in one cycle is its. Top value Maximum value Average value Peak value
3 With high frequencies capacitive reactance Increases Decreases Becomes double Becomes half
4 The value of power factor in an LCR sense circuit at resonance is. Zero 0.5 unity Infinity
5 A pure choke consumes No power Maximum power Minimum power Average power
6 The resistance of 10 micro F capacitance, when connected to A D.C. circuit is. Zero Unity -1 Infinity
7 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
8 How power factor of a circuit can be improved. Using capacitors Using cokes Using resistors All of these
9 Which device converts alternating current to direct current. Motor Generator Transformer Rectifier
10 Which is not the strongest and the most familiar type of magnetism. Diamagnetism Para magnetism Ferromagnetism All of these
11 What is the degree of magnetization of a material. Susceptibility Ablitity Retentivity Capacity
12 Slip Rings are used in D.C. dynamo A.C. dynamo Transformers Battries
13 The force on a point charge due to electromagnetic fields is called. Lorenz force Gauss's force Newton's force Ampere's force
14 Transformer make possible the transmission of A.C. power conversion of AC and D.C Cyclotron Particle accelerator
15 Capacitive reactance is measured in Henrys Ohms mhos electron volts
16 In alternating current circuits the quantity which plays the same role as resistance in direct current circuits is called. Reactance Admittance Conductance Impedance
17 Inductance divided by resistance and the product of capacitance and resistance both have units of. Charge Time Force Current
18 When current in an inductor is increasing energy is lost Energy is being stored in the magnetic field of the inductor Energy is being drained from the magnetic field of the inductor Eddy current is produced
19 An inductor may store energy in Its magnetic field Its electric field Its coils A neighboring circuit
20 Inductance are measured in Coulombs Volts Henrys Farads
21 Mutual inductance has a practical role in the performance of the Radiochoke Transformer Generator Trnasistor
22 In the magnetic circuit concept the quantity analogous to electric current in electric circuit analysis is. Magnetic flux density Permeability Magnetic field intensity Magnetic flux
23 Which of the following quantity is defined in terms of the rate of change of electric displacement field. Conventional current Electronic current Displacement current Pulsating current
24 How eddy current losses are reduced in A F and R F transformers. By using air cores By using shell cores By using laminated cores By using ferrite cores
25 They hysteresis losses are eliminated in power transformer by using Low resistivity power winding Low reflectance steel cores Laminated steel cores soft iron cores
26 If a person winds a coil of wire around a steel rod and then passes an electric current through the wire then the Steel rod becomes an electromagnet Steel rod becomes hot Wire becomes magnetized wire becomes demagnetized
27 Which equation in electromagnetism describe the magnetic field B generated by an electric current. ampere's circuital law Bio savart law Gauss's law for electromagnetism Coulomb's law
28 Lagging of magnetic flux density behind the magnetizing fled is known as. susceptibity Diamagnetism Hysteresis Retentivity
29 The material of an electromagnet should have high Permeability susceptibility Retentivity Hysteresis loss
30 Which of the given factors is increased in a step down transformer. Voltage Current Wattage Resistance
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