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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: Magnetic Field of a Straight Wire, Circular Coil and Solenoid

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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 * g * h
P = rho * h / g
P = 1/2 rho * g * h2
2.
In a hydraulic press, the ratio of the cross-sectional area of the large piston to that of the small piston is 50. If a force of 100 N is exerted on the small piston, the maximum force exerted by the large piston is:
5000 N
2500 N
2 N
50,000 N
3.
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)
4.
Why are hydroelectric storage dams constructed with a base that is significantly thicker than the crest?
To prevent solar radiation from penetrating the foundation
To allow fish to swim upstream through drainage gates
Because hydrostatic water pressure increases linearly with depth (P = rho * g * h), exerting immense overturning forces at the bottom
To reduce the gravitational pull of the bedrock
5.
A mercury manometer connected to a gas tank shows the mercury level in the free arm is 4 cm higher than the gas arm (Pa = 76 cm Hg). The gas pressure is:
76 cm Hg
4 cm Hg
80 cm Hg
72 cm Hg
6.
The volume expansion coefficient at constant pressure (alpha_v) and the pressure expansion coefficient at constant volume (beta_p) for all ideal gases have the universal constant value of:
1 / 273.15 K−1 (approx. 0.00366 K−1)
273.15 K
8.314 J/(mol.K)
1.013 x 105 Pa
7.
If both inductance \(L\) and capacitance \(C\) in a resonant circuit are doubled, the resonance frequency will:
A) Double
D) Remain unchanged
C) Decrease to half its original value
B) Quadruple
8.
In stimulated emission, the emitted photon and the triggering incident photon are characterized by having:
A) Different wavelengths and perpendicular directions
B) The exact same phase, frequency, direction, and polarization
C) A random phase difference of $pi/2$
D) Independent speeds in vacuum
9.
To achieve Population Inversion in a laser medium, the excited state must be a:
B) Metastable state with an exceptionally long lifetime of \(approx 10^{-3}\) s
A) Ground state of infinite lifetime
D) Fully ionized state
C) State that decays in less than \(10^{-12}\) seconds
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