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 What is emitted by the hot metal filament in a cathode ray tube. Alpha particles Electrons Protons X rays
2 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
3 In a galvanometer the enameled copper wire is wound on. An insulator A non magnetic material A magnetic material A conductor
4 The rectangular coil in galvanometer is made up of. Bare copper wire Insulated aluminum wire Enameled copper wire Enameled steel wire
5 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
6 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.
7 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
8 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
9 An electric motor could be used as a Battery Capacitor Dynamic Transofrmer
10 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
11 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
12 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
13 What is term for tendency of a system to oscillate with larger amplitude at some frequencies than at others. Resonance Impedance Inductance Capacitance
14 A preset or trimmer can be a. Variable resistor Variable capacitor Variable inductor All of these
15 A resistor whose resistance decreases with increasing intensity is. Light dependent resistor Thermistor Thermocouple Strain gauge
16 What type of current is produced by batteries. Direct current Alternating current Pulsating current Convection current
17 A device used to measure the strain of an object and it is a type of resistor that changes value with applied strain is a thermistor Strain gauge Thermocouple Potentiometer
18 A device consisting two different conductors that produce a voltage proportional to the temperature difference between either end of the pair of conductors is a. Thermistor Thermocouple Strain gauge Potentiometer
19 A type of resistor whose resistance varies significantly with temperature is. Thermistor Thermocouple Strain gauge Potentiometer
20 Generally, electrical resistivity of intrinsic semiconductors decreases with increasing. Pressure Volume Temperature Density
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