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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.
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
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
Proportional to the square of the cross-sectional area of the tube
Equal regardless of the liquids used
2.
Charles's Law establishes that at constant pressure, the volume of a given mass of gas is directly proportional to its:
Celsius temperature only
Atmospheric density
Square of the absolute temperature
Absolute temperature in Kelvin (T_K = t_C + 273.15)
3.
An air bubble released from the bottom of a deep lake expands in volume as it rises towards the surface because:
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
The hydrostatic pressure decreases as depth decreases, allowing the trapped air to expand according to Boyle's law
4.
The pressure of a gas trapped inside an incandescent light bulb is 0.8 atm at room temperature (27 °C). When the bulb operates, the filament heats the gas to 327 °C at constant volume. The operational pressure is:
1.2 atm
0.96 atm
1.6 atm
2.4 atm
5.
According to Wien's Displacement Law, when the absolute temperature of a radiating blackbody increases, the wavelength at peak intensity (\(\lambda_{\max}\)):
A) Increases proportionally
C) Remains strictly constant
B) Decreases proportionally to the inverse of temperature
D) Shifts into the radio frequency spectrum
6.
The slope of the straight line obtained by plotting maximum kinetic energy of photoelectrons against the frequency of incident light represents:
B) Speed of light in vacuum
D) Charge of the electron (\(e\))
C) Planck's constant (\(h\))
A) Work function of the metal
7.
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
C) Cool the quartz tube by rapid convection
A) Directly emit the red laser beam at 632.8 nm
8.
A 3D holographic plate differs fundamentally from an ordinary 2D photograph because it records:
A) Only light intensity and color
D) Thermal infrared radiation alone
C) Only the shadow of the object
B) Both the amplitude and phase difference of light waves via interference
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