Curriculum
Login

Curriculum

Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

0/20

Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

0/22

Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

0/24

Chapter 4 - Alternating Current AC Circuits

0/30

Chapter 5 - Dual Nature of Wave and Particle

0/33

Chapter 6 - Atomic Spectra and X-Rays

0/28

Chapter 7 - Lasers and Principles

0/31

Chapter 8 - Modern Electronics and Semiconductors

0/31

More lessons

0/83
Quiz

Lesson 2 Quiz: Resistor Combinations and Ohms Law for Closed Circuits

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit
  • Questions count: 20
Start Quiz
1.
STEM AC Transformer Problem 31: 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?
1.5 A
0.545 A
2.0 A
0.109 A
2.
STEM Modern Physics Laser Problem 9: 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
3.
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 toward junction A
4 A flowing away from junction A
4.
STEM Modern Physics Laser Problem 17: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
Thermal equilibrium where ground state atoms dominate
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
5.
STEM Magnetic Force Problem 31: 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
6.
STEM Modern Physics Laser Problem 42: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Thermal equilibrium where ground state atoms dominate
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
7.
STEM Modern Physics Laser Problem 18: 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
8.
STEM Kirchhoff's Laws Problem 7: 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 toward junction A
4 A flowing away from junction A
9.
STEM Compton Effect Problem 13: 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
10.
STEM Semiconductor Electronics Problem 29: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By doping with pentavalent Phosphorus atoms
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
By heating pure silicon above 1,000°C without impurities
11.
STEM Alternating Current Dynamo Problem 16: 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)
110 V
311 V
440 V
220 V
12.
Why is the scale of a Hot-Wire Ammeter non-uniformly divided with increasing intervals between marks?
D) Due to friction on the rotating pulley axis
A) Due to ambient room temperature fluctuations
B) Because thermal energy generated is proportional to the square of current (\(Q propto I^2\))
C) Because the expansion coefficient of Platinum-Iridium is nonlinear
13.
An air bubble released from the bottom of a deep lake expands in volume as it rises towards the surface because:
The bubble absorbs water molecules into its gas phase
The water temperature at the surface is near absolute zero
The hydrostatic pressure decreases as depth decreases, allowing the trapped air to expand according to Boyle's law
Atmospheric pressure increases at the surface
14.
STEM Magnetic Force Problem 17: 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
15.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Einstein's Photoelectric Equation and Work Function?
Photoelectron emission occurs at any frequency if intensity is high enough
Increasing light intensity increases the maximum kinetic energy of emitted electrons
Photoelectrons are emitted only if the incident photon frequency exceeds the threshold frequency (ν ≥ ν_c), and maximum kinetic energy is KE_max = hν - E_w, independent of light intensity
Work function E_w is universal and identical for all metals
16.
STEM Semiconductor Electronics Problem 21: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
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
By cooling silicon to absolute zero Kelvin
By heating pure silicon above 1,000°C without impurities
17.
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
18.
STEM Modern Physics Laser Problem 16: 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
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
Thermal equilibrium where ground state atoms dominate
19.
A fixed quantity of an ideal gas has a volume of 600 cm3 at 27 °C. If the gas is heated to 127 °C under constant pressure, its new volume will be:
700 cm3
900 cm3
1200 cm3
800 cm3
20.
In a U-tube manometer containing two immiscible liquids in equilibrium, the heights of the liquid columns measured above the separating surface are:
Directly proportional to their densities
Equal regardless of the liquids used
Proportional to the square of the cross-sectional area of the tube
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20