PPSC Physics Chapter 6 Electricity and Magnetism With Answers

image
image
image

PPSC Physics Chapter 6 Electricity and Magnetism

Sr. # Questions Answers Choice
1 If positive terminal of the battery is connected to n-type and negative terminal of the battery is connected to p-type then the diode is. Saturated A gate Forward biased Revere biased
2 A semiconductor diode conducts only when it is Not biased Zero biased Reverse biased Forward and biased
3
A diode cn be used as
 Amplifier Rectifier Oscillator Transistor
4 A junction between P-Type and n-type materials is called. Ampilifier Transistor Rectifier Diode
5 The process of mixing sound waves with carrier waves is known as. Rectification amplification Modulation Demodulation
6 In electronegative waves the electric and magnetic fields are. Parallel to each other Perpendicular to each other antiparallel to each other At an angle of 45 <sup>o</sup> to each other
7 The cosine of the phase angle between the current and voltage in an A.C. circuit is called the Lead factor Lag factor Dissipation factor Power factor
8 A choke coil is a coil with Low inductance and low resistance Low inductance and high resistance High inductance and low resistance Low inductance and negligible resistance
9 For an A.C. circuit the power factor is Always les than one Always greater than one Always equal to one Absent
10 The instantaneous voltage across a pure inductance. Leads the current by 90 <sup>o</sup> in phase Lags the current by 90 <sup>o</sup> in phase Is in phase with the current Leads the current by a phase angle which depends on the frequency
11 An A.C. dynamo operates on the principle of Mutual induction Self induction Electromagnetic induction Mechanical induction
12 In a purely resistive circuit carrying A.C. current the. Current and voltage are always in phase Current lags the voltage by 1/4 cycle Voltage lags the current by 1/4 cycle Current leads the voltage by 1/2 cycle
13 In modulation, low frequency signal is called Fluctuated signal Loaded signal Modulated signal Harmonic signal
14 As a result of modulation, the resultant wave is called. Carrier wave Modulated carrier wave Matter wave Energetic carrier wave
15 High frequency radio wave is called Fluctuate wave Carrier wave Matre wave Energetic wave
16 The process of combining low frequency signals with high frequency radio waves is called. Modulation Resonance Fluctuation Amplitude
17 The electromagnetic waves propagated outing space from antenna of a transmitter are known as. Infrared waves Light waves Radio waves X-rays
18 In an A.C. circuit the current. Is in phase with voltage Leads the voltage Lags the voltage Any of these depending upon the circumstances
19 Alternating current generator consists of a coil and a pair of. Split rings Slip rings Metal rings Copper rings
20 The effective resistance in an A.C. circuit is An inductance An impedance A mutual inductance Always zero
Download This Set

Is this page helpful?

×