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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 4 Quiz: The Electric Transformer and Electric Motor (DC Motor)

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  • Questions count: 8
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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
2 times
16 / 9
4 / 3 (since P1 / T1 = P2 / T2)
2.
Why is the scale of a Hot-Wire Ammeter non-uniformly divided with increasing intervals between marks?
A) Due to ambient room temperature fluctuations
D) Due to friction on the rotating pulley axis
C) Because the expansion coefficient of Platinum-Iridium is nonlinear
B) Because thermal energy generated is proportional to the square of current (\(Q propto I^2\))
3.
According to Wien's Displacement Law, when the absolute temperature of a radiating blackbody increases, the wavelength at peak intensity (\(\lambda_{\max}\)):
A) Increases proportionally
B) Decreases proportionally to the inverse of temperature
C) Remains strictly constant
D) Shifts into the radio frequency spectrum
4.
The slope of the straight line obtained by plotting maximum kinetic energy of photoelectrons against the frequency of incident light represents:
B) Speed of light in vacuum
D) Charge of the electron (\(e\))
C) Planck's constant (\(h\))
A) Work function of the metal
5.
STEM Modern Physics Laser Problem 24: 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
6.
STEM Modern Physics Laser Problem 25: 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
Thermal equilibrium where ground state atoms dominate
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
7.
STEM Modern Physics Laser Problem 42: 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
8.
STEM Modern Physics Laser Problem 43: 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
Thermal equilibrium where ground state atoms dominate
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
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