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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.
STEM Physics Problem 10: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
72.0 Ω
2.67 Ω
16.0 Ω
24.0 Ω
2.
STEM Semiconductor Electronics Problem 36: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
By heating pure silicon above 1,000°C without impurities
By cooling silicon to absolute zero Kelvin
By doping with pentavalent Phosphorus atoms
3.
STEM Alternating Current Dynamo Problem 13: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
220 V
311 V
110 V
440 V
4.
STEM Kirchhoff's Laws Problem 8: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I4
2 A flowing toward junction A
4 A flowing away from junction A
4 A flowing toward junction A
6 A flowing away from junction A
5.
STEM Alternating Current Dynamo Problem 20: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
220 V
440 V
311 V
110 V
6.
STEM Modern Physics Laser Problem 8: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Thermal equilibrium where ground state atoms dominate
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
7.
STEM Physics Problem 43: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
24.0 Ω
72.0 Ω
2.67 Ω
16.0 Ω
8.
STEM Magnetic Force Problem 34: A straight conductor of length 0.50 m carries a current of 4.0 A in a uniform magnetic field of flux density 0.20 T. What is the magnetic force acting on the wire when it is inclined at 30° to the field lines?
0.346 N
0.10 N
0.20 N
0.40 N
9.
STEM Semiconductor Electronics Problem 10: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
By cooling silicon to absolute zero Kelvin
By heating pure silicon above 1,000°C without impurities
By doping with pentavalent Phosphorus atoms
10.
STEM Physics Problem 42: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
2.67 Ω
72.0 Ω
24.0 Ω
16.0 Ω
11.
STEM Magnetic Force Problem 25: A straight conductor of length 0.50 m carries a current of 4.0 A in a uniform magnetic field of flux density 0.20 T. What is the magnetic force acting on the wire when it is inclined at 30° to the field lines?
0.20 N
0.40 N
0.346 N
0.10 N
12.
STEM Compton Effect Problem 39: In the Compton scattering effect, when a high-energy X-ray photon collides with a free stationary electron, which change occurs to the scattered photon?
Its speed decreases significantly while wavelength remains constant
Its mass increases while kinetic energy decreases
Its frequency decreases, its wavelength increases, and its speed remains strictly c (speed of light)
Its frequency increases and energy increases
13.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Ohm's Law for a Closed Circuit: V = VB - I*r?
The terminal voltage of a discharging battery is strictly less than its electromotive force (VB) by the internal potential drop (I*r)
The internal resistance r consumes reactive power without heat generation
The current in a series circuit depends only on the external resistance
The terminal voltage always exceeds the EMF when supplying current
14.
STEM Compton Effect Problem 18: In the Compton scattering effect, when a high-energy X-ray photon collides with a free stationary electron, which change occurs to the scattered photon?
Its speed decreases significantly while wavelength remains constant
Its mass increases while kinetic energy decreases
Its frequency decreases, its wavelength increases, and its speed remains strictly c (speed of light)
Its frequency increases and energy increases
15.
STEM Kirchhoff's Laws Problem 2: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I4
6 A flowing away from junction A
2 A flowing toward junction A
4 A flowing away from junction A
4 A flowing toward junction A
16.
STEM AC Transformer Problem 37: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
0.109 A
0.545 A
1.5 A
2.0 A
17.
STEM Compton Effect Problem 36: In the Compton scattering effect, when a high-energy X-ray photon collides with a free stationary electron, which change occurs to the scattered photon?
Its frequency decreases, its wavelength increases, and its speed remains strictly c (speed of light)
Its frequency increases and energy increases
Its mass increases while kinetic energy decreases
Its speed decreases significantly while wavelength remains constant
18.
STEM Semiconductor Electronics Problem 6: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By doping with pentavalent Phosphorus atoms
By heating pure silicon above 1,000°C without impurities
By cooling silicon to absolute zero Kelvin
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
19.
STEM AC Transformer Problem 14: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
2.0 A
0.545 A
0.109 A
1.5 A
20.
STEM Semiconductor Electronics Problem 43: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By heating pure silicon above 1,000°C without impurities
By cooling silicon to absolute zero Kelvin
By doping with pentavalent Phosphorus atoms
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
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