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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 2 Quiz: Digital Electronics and Logic Gates (NOT, AND, OR)

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1.
The relative density (specific gravity) of a substance is defined as:
The ratio of the density of the substance to the density of pure water at 4°C
The product of density and the acceleration due to gravity
The mass of the substance divided by its volume at 100°C
The reciprocal of the buoyant force
2.
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
Proportional to the square of the cross-sectional area of the tube
Equal regardless of the liquids used
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
3.
An air bubble released from the bottom of a deep lake expands in volume as it rises towards the surface because:
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
The bubble absorbs water molecules into its gas phase
4.
Real gases behave most closely to an ideal gas under conditions of:
Very low pressure and high temperature (where intermolecular attraction forces and molecular volumes become negligible)
High pressure and near liquefaction point
Extremely high pressure and low temperature
Zero gravitational acceleration
5.
Why is the scale of a Hot-Wire Ammeter non-uniformly divided with increasing intervals between marks?
C) Because the expansion coefficient of Platinum-Iridium is nonlinear
B) Because thermal energy generated is proportional to the square of current (\(Q propto I^2\))
A) Due to ambient room temperature fluctuations
D) Due to friction on the rotating pulley axis
6.
The primary function of Helium gas in the Helium-Neon laser tube is to:
B) Excite Neon atoms to their metastable state via resonant collision
D) Act as a partially reflecting output mirror
A) Directly emit the red laser beam at 632.8 nm
C) Cool the quartz tube by rapid convection
7.
In stimulated emission, the emitted photon and the triggering incident photon are characterized by having:
B) The exact same phase, frequency, direction, and polarization
D) Independent speeds in vacuum
C) A random phase difference of $pi/2$
A) Different wavelengths and perpendicular directions
8.
A 3D holographic plate differs fundamentally from an ordinary 2D photograph because it records:
C) Only the shadow of the object
B) Both the amplitude and phase difference of light waves via interference
A) Only light intensity and color
D) Thermal infrared radiation alone
9.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Einstein's Photoelectric Equation and Work Function?
Work function E_w is universal and identical for all metals
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
Increasing light intensity increases the maximum kinetic energy of emitted electrons
Photoelectron emission occurs at any frequency if intensity is high enough
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