PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 When a following field is governed by Maxwell's equations. Electrodynamics Optics electric circuits All of these
2 In the concept of magnetic circuit, the quantity analogous to resistance in Ohm's law is. Reactance Dipole Impedence Reluctance
3 An instrument used to find the direction of the earths magnetic field is known as. Magnetometer Electroscope Cyclotron Particle accelerator
4 The basic quantity used to describe the state of magnetization of a substance is the Magnetic strength Magnetic susceptibility Magnetic moment Magnetic moment per unit volume
5 A charged particles moving in a magnetic field experiences a resultant force. Proportional to its K.E. In the direction of the field In the direction opposite to its motion In the direction perpendicular to both the field and its motion
6 The magnetic induction is also called the Magnetic intensity Magnetic flux Magnetic flux density Magnetic magnetization
7 A magnetic pole Is made of a magnetic material Is a factious quantity Is defined in terms of Ampere's law Cannot be detected
8 A magnetic field is said to exist at a point if A force is exerted on a charge placed at that point A magnetic pole exists at that point An ampersand current loop surrounds the point A force not felt by a static charge acts on a moving charge placed at that point
9 What does a dynamo generate Electrons Emf anion Cation
10 The immediate cause of alternating currrent in the secondary coil of a transformer is A changing electric field a changing magnetic field The motion of primary coil The iron core of the trnasformer
11 When a charged particle moves through a magnetic field it suffers a change in its Charge Mass Energy Direction of motion
12 In which form energy in an inductance coil is stored. Heat energy Light energy Magnetic energy Nuclear energy
13 An alternating current can be produced by Turbine Electric motor Generator Trnasormer
14 Why choke coil is used in an AC circuit. To decrease D.C. To increases A.C. To decreases A.C To increase D.C
15 The impedance of a pure anti resonant circuit at resonance is. Zero Unity Infinity 0.5
16 The electric supply line in houses works at 220 V what will be the amplitude of emf. 120 V 331 V 220 V 440 V
17 What is the power factor of LR circuit. Unity Zero infinity Between 0 and 1
18 A pure capacitor is connected in an AC circuit The power factor of the circuit will be. Unity Infinity 0.5 Zero
19 What is the power factors of wattles current. Infinity Unity 0.5 Zero
20 The source of magnetic field are Isolated magnetic poles Electric charge distributions Current loops Solenoids
21 When the number of turns in the solenoid is doubled without any change in teh length of the solenoid its self inductance will be. Halved Doubled 4 times 8 times
22 The inductance in a coil plays the same role as Inertia plays in machans torque plays in machines Energy plays in machines Momentum plays in machines
23 By placing soft iron inside a coil Increases the magnetic flux Decreases the magnetic flux Creates no change in magnetic flux Decreases the diameter of the core
24 The magnetic flux linked with a circuit when a unit current flows through it is known as. Induced current Induced emf Coefficient of self induction of circuit Eddy current
25 The main causes of power losses in a generator are. Pulsatng current Eddy current Magnetic current Both B and C
26 Self inductances of solenoid is Directly proportional to the current flowing through the wire Directly proportional to its length Inversely proportional to area of corss section Directly proportional to number of turns
27 The sensitiveness of a moving soil galvanometer can be increased by Decreasing the number of turns of the coil Decreasing the area of the coil Increasing the couple per unit twist of the suspension Increasing the magnetic flux
28 The mains frequency in Pakistan is 20 Hz 50 Hz 40 Hz 60 Hz
29 How the fuse wire in electric supply line is connected to protect the electrical appliances. In parallel In sereis In mixed order In vertical position
30 How the small bulbs used for decoration purposes are connected. In parallel In series In mixed order In vertical position
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