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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 1 Quiz: Hydrogen Atomic Emission Spectrum and Production of X-Rays

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1.
The hydrostatic pressure exerted by a static homogeneous liquid of density rho at depth h beneath its free surface is expressed by:
P = rho * g * h
P = rho * h / g
P = 1/2 rho * g * h2
P = rho * g / h
2.
Absolute zero temperature (0 Kelvin or -273.15 °C) is defined physically as the theoretical temperature at which:
All liquids solidify into glass
Water reaches its maximum density
Atmospheric air completely combusts
The volume and pressure of an ideal gas theoretically extrapolate to zero and translational molecular motion reaches its quantum minimum
3.
The Ideal Gas Law combining all empirical gas relationships is mathematically formulated as:
P * T = n * R * V
P * V = n * R * T
P * V = m * g * h
P / V = n * R * T
4.
An air bubble released from the bottom of a deep lake expands in volume as it rises towards the surface because:
The hydrostatic pressure decreases as depth decreases, allowing the trapped air to expand according to Boyle's law
The bubble absorbs water molecules into its gas phase
Atmospheric pressure increases at the surface
The water temperature at the surface is near absolute zero
5.
Real gases behave most closely to an ideal gas under conditions of:
High pressure and near liquefaction point
Zero gravitational acceleration
Extremely high pressure and low temperature
Very low pressure and high temperature (where intermolecular attraction forces and molecular volumes become negligible)
6.
Why is the scale of a Hot-Wire Ammeter non-uniformly divided with increasing intervals between marks?
B) Because thermal energy generated is proportional to the square of current (\(Q propto I^2\))
D) Due to friction on the rotating pulley axis
C) Because the expansion coefficient of Platinum-Iridium is nonlinear
A) Due to ambient room temperature fluctuations
7.
To achieve Population Inversion in a laser medium, the excited state must be a:
D) Fully ionized state
A) Ground state of infinite lifetime
B) Metastable state with an exceptionally long lifetime of \(approx 10^{-3}\) s
C) State that decays in less than \(10^{-12}\) seconds
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