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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: 7
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1.
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)
2.
Boyle's Law states that for a fixed mass of an ideal gas kept at constant temperature, the volume V is:
Directly proportional to pressure
Inversely proportional to its absolute pressure P (P1 * V1 = P2 * V2)
Independent of pressure changes
Directly proportional to absolute temperature
3.
The volume expansion coefficient at constant pressure (alpha_v) and the pressure expansion coefficient at constant volume (beta_p) for all ideal gases have the universal constant value of:
273.15 K
1 / 273.15 K−1 (approx. 0.00366 K−1)
1.013 x 105 Pa
8.314 J/(mol.K)
4.
The volume expansion coefficient at constant pressure (alpha_v) of an ideal gas is physically measured using:
A venturi meter and manometer
Joly's bulb apparatus or Charles's apparatus with a dry mercury droplet index
A hydrometer
A torsion balance
5.
To achieve Population Inversion in a laser medium, the excited state must be a:
A) Ground state of infinite lifetime
C) State that decays in less than \(10^{-12}\) seconds
B) Metastable state with an exceptionally long lifetime of \(approx 10^{-3}\) s
D) Fully ionized state
6.
STEM Modern Physics Laser Problem 33: 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
Thermal equilibrium where ground state atoms dominate
High electrical resistance in the discharge tube
7.
STEM Modern Physics Laser Problem 34: 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
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