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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: Blackbody Radiation, Max Planck Hypothesis and the Photon

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  • Questions count: 5
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1.
In a U-tube manometer containing two immiscible liquids in equilibrium, the heights of the liquid columns measured above the separating surface are:
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
Equal regardless of the liquids used
Directly proportional to their densities
Proportional to the square of the cross-sectional area of the tube
2.
In a hydraulic press, if the radius of the large piston is 4 times that of the small piston, the mechanical advantage is:
4
16
8
2
3.
A U-tube contains water (ρ = 1000 kg/m3) and oil (ρ = 800 kg/m3). If the oil column height above the interface is 10 cm, the balancing water column height is:
10 cm
6.4 cm
12.5 cm
8 cm
4.
When an alternating voltage is applied to an AC circuit containing a pure inductor of inductance \(L\), the phase relationship is:
A) Voltage and current are in phase
C) Voltage leads current by \(90^circ\)
B) Current leads voltage by \(90^circ\)
D) Voltage leads current by \(180^circ\)
5.
If the frequency of an AC circuit containing a capacitor is doubled, its capacitive reactance (\(X_C\)) will:
A) Double
D) Remain unchanged
C) Decrease to half its initial value
B) Quadruple
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