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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: Electric Current, Potential Difference, Resistance and Resistivity

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1.
The mechanical advantage (eta) of an ideal hydraulic press equals all of the following ratios EXCEPT:
Area of the large piston / Area of the small piston (A / a)
Force on the large piston / Force on the small piston (F / f)
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)
2.
The relative density (specific gravity) of a substance is defined as:
The product of density and the acceleration due to gravity
The reciprocal of the buoyant force
The ratio of the density of the substance to the density of pure water at 4°C
The mass of the substance divided by its volume at 100°C
3.
When an alternating voltage is applied to an AC circuit containing a pure inductor of inductance \(L\), the phase relationship is:
C) Voltage leads current by \(90^circ\)
B) Current leads voltage by \(90^circ\)
A) Voltage and current are in phase
D) Voltage leads current by \(180^circ\)
4.
In a series R-L-C circuit, when inductive reactance equals capacitive reactance (\(X_L = X_C\)), the total impedance of the circuit is equal to:
B) The ohmic resistance \(R\)
A) Zero
D) Infinite
C) \(sqrt{R^2 + X_L^2}\)
5.
In an R-L-C circuit, if \(V_R = 30\) V, \(V_L = 80\) V, and \(V_C = 40\) V, the total supply voltage across the circuit is:
D) 10 V
A) 150 V
B) 70 V
C) 50 V
6.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Ohm's Law for a Closed Circuit: V = VB - I*r?
The terminal voltage of a discharging battery is strictly less than its electromotive force (VB) by the internal potential drop (I*r)
The terminal voltage always exceeds the EMF when supplying current
The internal resistance r consumes reactive power without heat generation
The current in a series circuit depends only on the external resistance
7.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Einstein's Photoelectric Equation and Work Function?
Photoelectron emission occurs at any frequency if intensity is high enough
Work function E_w is universal and identical for all metals
Increasing light intensity increases the maximum kinetic energy of emitted electrons
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
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