PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field. Magnetism electroplating Diamagnetism <div>Electrolysis</div>
2 If a conductor sun infirmly stretched so that its length is increased in timed, then its resistance becomes. n times the original resistance 1/n times the original resistance n2 times the original resistance n3 times the original resistance
3 The cathode ray oscilloscope is used For viewing the wave shape of rapidly changing electric current As voltmeter For measuring time intervals between electricalimpulses All of the above
4 If a resistance is connected in parallel with a galvanometer the resulting instrument is called. A voltmeter An ammeter A wattmeter A potentiometer
5 In electric magnetism , the additional fundamental quantity that is chosen as a basic unit is called. Electric potential Electric fierce Electric charge Magnetic force
6 Relative permeability is The ratio of flux density in a material to that for a vacuum Very large for paramagnetic materials small for paramagnetic materials None of these
7 A straight wire carrying current will experience a force when place in uniform magnetic field if The current and field are parallel The current and field are at an angle the current and field are parallel in opposite directions All of the above
8 A straight wire carrying current will experience a force when placed in a uniform magnetic field if The current and field are parallel The current and field are at an angle the current and field are parallel in opposite directions All of the above
9 When a charged particle is moved through a magnetic field if suffers is change in its. Charge energy Mass direction of motion
10 Which given material is the best for making connecting wires Nichrome Iron Gold Copper
11 Which of the following quantity in analogous to temperature in electricity. Charge Resistance Inductances Potential
12 Which of the following quantities is analogous to mass in electricty. Charge Potential Capacitance Inductance
13 The current passing through the switch s will be Zero 3 A 4.5 A 10 A
14 Which one of the following instruments has the maximum resistance. Ammeter Voltmeter Micro ammeter Milli ammeter
15 In which device is a permanent magnet used An electric bell An electromagnet A plotting compass A relay
16 It is deduced that a piece of metal is already a magnet if A copper wire is attracted to it A copper wire is repelled by it One end of a compass is repelled by it Both ends of a compass needle are attracted to it.
17 The current passing through the coil of a galvanometer is directly proportional to Resistance voltage Angle of deflection conductance
18 What is emitted by the hot metal filament in a cathode ray tube. Alpha particles Electrons Protons X rays
19 How are the electrons produced in a cathode ray tube. By applying an electric field to the x plates By heating a metal filament By ionization of the air By radioactive decay
20 In a galvanometer the enameled copper wire is wound on. An insulator A non magnetic material A magnetic material A conductor
21 The rectangular coil in galvanometer is made up of. Bare copper wire Insulated aluminum wire Enameled copper wire Enameled steel wire
22 In a simple D.C. motor the direction of current in the motor is reversed every half revolution to keep the motor turning in the same direction which part of the motor does this. Brushes Coil Commutator Poles
23 The cathode ray oscilloscope is used for Displaying the waveform of given voltage Displaying the wave form of given vibrations Rectifying a.c to d.c. Rectifying D.C. to A.C.
24 An electric Heater and a fan are marked 1000 W, 250 V and 100 W , 220 V respectively The resistance of fan is. Equal to that of heater Greater than that of heater Less than that of heater Zero
25 If emf of the battery in a thermocouple is doubled, what is the rate of heat generation at one function. Remains unchanged Becomes half Become double Becomes 4 times
26 An electric motor could be used as a Battery Capacitor Dynamic Transofrmer
27 It is sometimes necessary to protect electrical apparatus from magnetic field This can be done by surrounding the apparatus with a box made from. Aluminum Iron Steel Rubber
28 Which part of a simple D.C. motor reverses the direction of current through the coil every half cycle. the armature The commutator the brushes The slip rings
29 Charge to mass ration of an electron is determined by using the relation. e/m = B/rv e/m = r/vB e/m = V/Br e/m = v/r
30 What is term for tendency of a system to oscillate with larger amplitude at some frequencies than at others. Resonance Impedance Inductance Capacitance
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