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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 2 Quiz: Mutual Induction Between Two Coils and Self-Induction of a Single Coil

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1.
STEM Modern Physics Laser Problem 30: 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
2.
STEM Kirchhoff's Laws Problem 32: 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 I
4 A flowing away from junction A
2 A flowing toward junction A
6 A flowing away from junction A
4 A flowing toward junction A
3.
STEM Modern Physics Laser Problem 10: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
High electrical resistance in the discharge tube
Complete absence of resonant optical mirrors
Thermal equilibrium where ground state atoms dominate
4.
STEM Compton Effect Problem 32: 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 increases and energy increases
Its mass increases while kinetic energy decreases
Its frequency decreases, its wavelength increases, and its speed remains strictly c (speed of light)
Its speed decreases significantly while wavelength remains constant
5.
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 heating pure silicon above 1,000°C without impurities
By doping with pentavalent Phosphorus atoms
By cooling silicon to absolute zero Kelvin
6.
STEM Compton Effect Problem 40: 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 frequency increases and energy increases
Its mass increases while kinetic energy decreases
Its frequency decreases, its wavelength increases, and its speed remains strictly c (speed of light)
7.
STEM Alternating Current Dynamo Problem 6: 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
8.
STEM Alternating Current Dynamo Problem 32: 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
9.
STEM AC Transformer Problem 26: 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
10.
STEM Kirchhoff's Laws Problem 43: 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 I
4 A flowing toward junction A
2 A flowing toward junction A
4 A flowing away from junction A
6 A flowing away from junction A
11.
STEM Kirchhoff's Laws Problem 21: 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 I
4 A flowing away from junction A
6 A flowing away from junction A
4 A flowing toward junction A
2 A flowing toward junction A
12.
The mechanical advantage (eta) of an ideal hydraulic press equals all of the following ratios EXCEPT:
Work done by the large piston / Work done on the small piston > 1
Distance moved by the small piston / Distance moved by the large piston (y1 / y2)
Area of the large piston / Area of the small piston (A / a)
Force on the large piston / Force on the small piston (F / f)
13.
STEM Magnetic Force Problem 19: 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
0.346 N
0.10 N
0.40 N
14.
STEM Compton Effect Problem 5: 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
15.
If both the absolute temperature and the absolute pressure of a confined ideal gas are doubled, the volume of the gas:
Remains constant and unchanged
Decreases to one-fourth
Doubles to twice its original volume
Quadruples
16.
STEM Alternating Current Dynamo Problem 42: 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)
311 V
440 V
220 V
110 V
17.
STEM Kirchhoff's Laws Problem 38: 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 I
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
18.
STEM Alternating Current Dynamo Problem 34: 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)
311 V
440 V
220 V
110 V
19.
STEM Alternating Current Dynamo Problem 21: 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
20.
STEM Kirchhoff's Laws Problem 41: 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 I
4 A flowing toward junction A
6 A flowing away from junction A
2 A flowing toward junction A
4 A flowing away from junction A
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