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 1 Quiz: Blackbody Radiation, Max Planck Hypothesis and the Photon

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 Physics Problem 39: 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?
16.0 Ω
24.0 Ω
72.0 Ω
2.67 Ω
2.
STEM Semiconductor Electronics Problem 31: 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 heating pure silicon above 1,000°C without impurities
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
3.
STEM Physics Problem 33: 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?
16.0 Ω
2.67 Ω
24.0 Ω
72.0 Ω
4.
STEM Modern Physics Laser Problem 11: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
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
5.
STEM AC Transformer Problem 6: 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
6.
STEM AC Transformer Problem 40: 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
0.109 A
0.545 A
1.5 A
7.
STEM Kirchhoff's Laws Problem 23: 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
8.
STEM Semiconductor Electronics Problem 5: 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
9.
STEM Physics Problem 15: 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
24.0 Ω
16.0 Ω
2.67 Ω
10.
STEM Physics Problem 40: 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
16.0 Ω
2.67 Ω
24.0 Ω
11.
STEM Modern Physics Laser Problem 21: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
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
Thermal equilibrium where ground state atoms dominate
Complete absence of resonant optical mirrors
12.
STEM AC Transformer Problem 32: 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
2.0 A
1.5 A
0.545 A
13.
STEM Modern Physics Laser Problem 3: 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
14.
STEM Kirchhoff's Laws Problem 1: 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
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
15.
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
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
Thermal equilibrium where ground state atoms dominate
16.
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
1.5 A
0.109 A
17.
STEM Kirchhoff's Laws Problem 34: 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
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
18.
STEM AC Transformer Problem 36: 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
0.109 A
2.0 A
19.
STEM AC Transformer Problem 39: 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?
0.545 A
0.109 A
2.0 A
1.5 A
20.
STEM Kirchhoff's Laws Problem 9: 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
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
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20