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Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1 Quiz: Intrinsic and Doped Semiconductors, the p-n Junction and Transistors

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1.
When a gas trapped inside a rigid container of fixed volume is heated from 27 °C (300 K) to 127 °C (400 K), its pressure increases by a factor of:
127 / 27
16 / 9
4 / 3 (since P1 / T1 = P2 / T2)
2 times
2.
When an alternating voltage is applied to an AC circuit containing a pure inductor of inductance \(L\), the phase relationship is:
A) Voltage and current are in phase
C) Voltage leads current by \(90^circ\)
D) Voltage leads current by \(180^circ\)
B) Current leads voltage by \(90^circ\)
3.
If the frequency of an AC circuit containing a capacitor is doubled, its capacitive reactance (\(X_C\)) will:
C) Decrease to half its initial value
B) Quadruple
A) Double
D) Remain unchanged
4.
In a pure capacitor circuit connected to an AC source, the average power consumed over a full cycle is:
A) \(V_{text{eff}} times I_{text{eff}}\)
C) Zero
D) \(0.5 times V_{max} times I_{max}\)
B) \(I_{text{eff}}^2 times X_C\)
5.
In a series R-L-C circuit, when inductive reactance equals capacitive reactance (\(X_L = X_C\)), the total impedance of the circuit is equal to:
B) The ohmic resistance \(R\)
C) \(sqrt{R^2 + X_L^2}\)
D) Infinite
A) Zero
6.
If both inductance \(L\) and capacitance \(C\) in a resonant circuit are doubled, the resonance frequency will:
B) Quadruple
A) Double
D) Remain unchanged
C) Decrease to half its original value
7.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Resonance Condition in an AC Series RLC Circuit?
Impedance is at its maximum value at resonance
Resonance occurs only when resistance R is zero
The current lags behind the voltage by 90 degrees at resonance
At resonance frequency (f_0 = 1 / (2π√(LC))), inductive reactance equals capacitive reactance (X_L = X_C), circuit impedance Z equals pure resistance R, and current is at its maximum value in phase with voltage
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